CN117411509A - Remote radio frequency unit, baseband signal processing method and system - Google Patents

Abstract

The application discloses a remote radio frequency unit, a baseband signal processing method and a system. Wherein, the remote radio frequency unit comprises: the digital front-end chip receives the first baseband signal from the far-end convergence unit, and performs frame-releasing, decompression, shaping filtering, up-sampling and data pre-distortion processing on the first baseband signal to obtain a second baseband signal, and the transceiver chip performs digital-to-analog conversion and up-mixing processing on the second baseband signal and sends the obtained first radio frequency signal to the terminal; in the uplink stage, the receiving and transmitting chip receives the second radio frequency signal sent by the terminal, performs down mixing and analog-to-digital conversion on the second radio frequency signal to obtain a third baseband signal, and the digital front-end chip performs down sampling, shaping filtering, compression and framing on the third baseband signal and sends the obtained fourth baseband signal to the far-end convergence unit. The method and the device solve the technical problem that the general baseband processing scheme in the related technology cannot meet the current network deployment requirement.

Description

Remote radio frequency unit, baseband signal processing method and system

Technical Field

The present invention relates to the field of communications technologies, and in particular, to a remote radio unit, a baseband signal processing method and a system.

Background

The 5G customized outdoor station is a device for realizing NR (New Radio) wireless access function, which adopts an integrated design of BBU (Building Baseband Unit, baseband processing unit) and RRU (Remote Radio Unit ), supports inter-station cascading, also supports remote RRU alone, and can be accessed to a 5G core network through PON (Passive Optical Network ) or STN (Smart Transport Network, intelligent transmission network) to provide NR service for users. The system adopts a flattened network architecture, does not need to reconstruct a machine room and a transmission network, and is suitable for application areas with weak signal coverage, such as rural hot spot areas, low-value indoor scenes in urban areas and the like. Compared with the traditional macro base station, the macro base station has the advantages of quick network construction, low maintenance cost and the like.

The main requirements of the remote RRU for the outdoor coverage scenario on hardware are a digital signal processing chip, a radio frequency Transceiver chip, a PA (Power Amplifier), a radio frequency switch, an LNA (Low Noise Amplifier ), a filter, etc., and the core digital signal processing chip generally adopts a CPU (Central Processing Unit, a central processing unit) +fpga (Field-Programmable Gate Array, a Field programmable gate array) +transceiver (Transmitter and Receiver) architecture. Because the CPU function and the FPGA function in the architecture are respectively realized in two chips, the functional integration level is not high, the hardware cost is increased, and the power consumption cannot be effectively reduced.

At present, the requirements of 5G outdoor products on cost and power consumption are strict, the existing general baseband processing scheme aiming at a high-capacity transceiving scene can not meet the current network deployment requirement, and the RRU needs to be considered for customized design, including product specification, forwarding processing, digital signal processing and the like, so that the capacity is reduced, the design is simplified, and the aims of reducing cost and enhancing efficiency are fulfilled on the premise of meeting the wireless coverage requirement.

In view of the above problems, no effective solution has been proposed at present.

Disclosure of Invention

The embodiment of the application provides a remote radio frequency unit, a baseband signal processing method and a system, which are used for at least solving the technical problem that a general baseband processing scheme in the related art cannot meet the current network deployment requirement.

According to an aspect of an embodiment of the present application, there is provided a remote radio unit, including: the digital front-end chip is used for receiving a first baseband signal from the far-end convergence unit in a data downlink stage, processing the first baseband signal according to a first processing mode to obtain a second baseband signal, and transmitting the second baseband signal to the transceiver chip, wherein the first processing mode comprises at least one of the following steps: de-framing, decompressing, shaping filtering, up-sampling filtering and data pre-distortion processing; the receiving and transmitting chip is used for receiving a second baseband signal, processing the second baseband signal according to a second processing mode to obtain a first radio frequency signal, and sending the first radio frequency signal to the target terminal through the radio frequency and antenna module, wherein the second processing mode comprises at least one of the following steps: digital-to-analog conversion and up-mixing processing; in the data uplink stage, the transceiver chip is configured to receive a second radio frequency signal sent by the target terminal through the radio frequency and antenna module, process the second radio frequency signal according to a third processing mode, obtain a third baseband signal, and transmit the third baseband signal to the digital front-end chip, where the third processing mode includes at least one of the following: performing down mixing and analog-to-digital conversion; the digital front-end chip is used for receiving the third baseband signal, processing the third baseband signal according to a fourth processing mode to obtain a fourth baseband signal, and sending the fourth baseband signal to the far-end convergence unit, wherein the fourth processing mode comprises at least one of the following steps: downsampling filtering, shaping filtering, compressing and framing processing.

Optionally, the remote radio frequency unit and the target terminal perform signal transmission through a new air interface transmission mode of two receiving and transmitting channels.

Optionally, the first baseband signal and the fourth baseband signal are data in a target frame format, wherein in the target frame format, each radio frame comprises 150 superframes, each superframe comprises 256 basic frames, each basic frame comprises 40 data words, and the bit width of each data word is 64 bits; in each basic frame, the high 32bit of the 1 st, 2 nd and 3 rd data words is used for storing control and supervision information; the low 32bit of the 3 rd data word and the high 32bit of the 4 th data word are reserved parts for storing the automatic gain control compression factors; the lower 32 bits of the 4 th data word are reserved parts; the high 32 bits of the 5 th to 36 th data words are used for storing baseband IQ data of a first receiving and transmitting channel of a new air interface, wherein the high 16 bits are used for storing real part data, and the low 16 bits are used for storing imaginary part data; the low 32 bits of the 5 th to 36 th data words are used for storing baseband IQ data of a second receiving and transmitting channel of a new air interface, wherein the high 16 bits are used for storing real part data, and the low 16 bits are used for storing imaginary part data; the 37 th and 38 th data words are reserved parts for storing the third receiving and transmitting channel data of the long term evolution air interface; the 39 th and 40 th data words are reserved parts for storing the fourth receiving and transmitting channel data of the long term evolution air interface.

Optionally, the digital front-end chip includes: the system comprises a forward interface module, a filtering module and a data predistortion processing module, wherein the forward interface module is used for carrying out frame de-formation on a first baseband signal in a target frame format in a data downlink stage to obtain a fifth baseband signal and first control and supervision information, and packaging the first control and supervision information into a register and writing the register into a CPU, wherein the fifth baseband signal comprises: first baseband IQ data corresponding to a first receiving and transmitting channel, and second baseband IQ data corresponding to a second receiving and transmitting channel; the filtering module is used for carrying out up-sampling filtering processing on the fifth baseband signal to obtain a sixth baseband signal; the data predistortion processing module is used for performing data predistortion processing on the sixth baseband signal to obtain a second baseband signal; in the data uplink stage, the filtering module is used for sequentially carrying out downsampling filtering and shaping filtering processing on the third baseband signal to obtain a seventh baseband signal; the forwarding interface module is configured to obtain second control and supervision information from the CPU, and perform framing processing on the seventh baseband signal and the second control and supervision information according to a target frame format, so as to obtain a fourth baseband signal, where the seventh baseband signal includes: third baseband IQ data corresponding to the first receiving and transmitting channel, and fourth baseband IQ data corresponding to the second receiving and transmitting channel.

Optionally, the filtering module includes: the device comprises a finite length unit impulse response filter for shaping filtering, a plurality of half-band filters for upsampling filtering and a control module, wherein the control module is used for determining filtering configuration information, invoking a filter corresponding to the filtering configuration information to carry out filtering processing on a received signal, and the filtering configuration information comprises: the type and number of filters that need to be invoked.

Optionally, the transceiver chip includes: the system comprises a signal conversion module and a mixing module, wherein the signal conversion module is used for carrying out digital-to-analog conversion processing on a second baseband signal in a data downlink stage to obtain an eighth baseband signal; the frequency mixing module is used for carrying out up-mixing processing on the eighth baseband signal to obtain a first radio frequency signal; in the data uplink stage, the frequency mixing module is used for carrying out frequency mixing processing on the second radio frequency signal to obtain a ninth baseband signal; the signal conversion module is used for carrying out analog-to-digital conversion processing on the ninth baseband signal to obtain a third baseband signal.

Optionally, the digital front-end chip and the transceiver chip each include: and the digital front-end chip and the transceiver chip transmit the second baseband signal and the third baseband signal through the high-speed serial data interface.

According to another aspect of the embodiments of the present application, there is further provided a baseband signal processing method, including: the method comprises the steps of receiving a first baseband signal from a far-end convergence unit through a digital front-end chip, processing the first baseband signal according to a first processing mode to obtain a second baseband signal, and transmitting the second baseband signal to a receiving-transmitting chip, wherein the first processing mode comprises at least one of the following steps: de-framing, decompressing, shaping filtering, up-sampling filtering and data pre-distortion processing; receiving a second baseband signal through a transceiver chip, processing the second baseband signal according to a second processing mode to obtain a first radio frequency signal, and sending the first radio frequency signal to a target terminal through a radio frequency and antenna module, wherein the second processing mode comprises at least one of the following steps: digital-to-analog conversion and up-mixing processing.

According to another aspect of the embodiments of the present application, there is further provided a baseband signal processing method, including: the receiving and transmitting chip receives a second radio frequency signal sent by the target terminal through the radio frequency and antenna module, processes the second radio frequency signal according to a third processing mode to obtain a third baseband signal, and transmits the third baseband signal to the digital front-end chip, wherein the third processing mode comprises at least one of the following steps: performing down mixing and analog-to-digital conversion; receiving a third baseband signal through the digital front-end chip, processing the third baseband signal according to a fourth processing mode to obtain a fourth baseband signal, and sending the fourth baseband signal to the far-end convergence unit, wherein the fourth processing mode comprises at least one of the following steps: downsampling filtering, shaping filtering, compressing and framing processing.

According to another aspect of the embodiments of the present application, there is also provided a baseband signal processing system, including: the system comprises a far-end convergence unit, a far-end radio frequency unit, a radio frequency and antenna module and a target terminal, wherein the far-end radio frequency unit comprises: a digital front-end chip and a transceiver chip; in the data downlink stage, the digital front-end chip is configured to receive a first baseband signal from the far-end aggregation unit, process the first baseband signal according to a first processing mode to obtain a second baseband signal, and transmit the second baseband signal to the transceiver chip, where the first processing mode includes at least one of the following: de-framing, decompressing, shaping filtering, up-sampling filtering and data pre-distortion processing; the receiving and transmitting chip is used for receiving the second baseband signal, processing the second baseband signal according to a second processing mode to obtain a first radio frequency signal, and transmitting the first radio frequency signal to the target terminal through the radio frequency and antenna module, wherein the second processing mode comprises at least one of the following steps: digital-to-analog conversion and up-mixing processing; in the data uplink stage, the transceiver chip is configured to receive a second radio frequency signal sent by the target terminal through the radio frequency and antenna module, process the second radio frequency signal according to a third processing mode, obtain a third baseband signal, and transmit the third baseband signal to the digital front-end chip, where the third processing mode includes at least one of the following: performing down mixing and analog-to-digital conversion; the digital front-end chip is used for receiving the third baseband signal, processing the third baseband signal according to a fourth processing mode to obtain a fourth baseband signal, and sending the fourth baseband signal to the far-end convergence unit, wherein the fourth processing mode comprises at least one of the following steps: downsampling filtering, shaping filtering, compressing and framing processing.

According to another aspect of the embodiments of the present application, there is further provided a nonvolatile storage medium, where the nonvolatile storage medium includes a stored computer program, and a device where the nonvolatile storage medium is located executes the baseband signal processing method by running the computer program.

According to another aspect of the embodiments of the present application, there is also provided an electronic device including: the device comprises a memory and a processor, wherein the memory stores a computer program, and the processor is configured to execute the baseband signal processing method through the computer program.

In the embodiment of the present application, the remote radio unit includes: a digital front-end chip and a transceiver chip; in a data downlink stage, a digital front-end chip receives a first baseband signal from a far-end convergence unit, processes the first baseband signal by frame decompression, shaping filtering, up-sampling filtering, data predistortion and the like to obtain a second baseband signal, and a transceiver chip carries out digital-to-analog conversion and up-mixing processing on the second baseband signal to obtain a first radio frequency signal and sends the first radio frequency signal to a target terminal through a radio frequency and antenna module; in the data uplink stage, the receiving and transmitting chip receives a second radio frequency signal sent by the target terminal through the radio frequency and antenna module, performs down-mixing and analog-to-digital conversion processing on the second radio frequency signal to obtain a third baseband signal, and the digital front-end chip performs down-sampling filtering, shaping filtering, compression, framing and other processing on the third baseband signal to obtain a fourth baseband signal, and sends the fourth baseband signal to the far-end convergence unit. The CPU function and the FPGA function in the conventional far-end radio frequency unit design are integrated into the digital front-end chip, so that the chip function integration level is higher, the hardware cost is lower, the power consumption is smaller, the purposes of cost reduction and efficiency improvement are realized, and the technical problem that the general baseband processing scheme in the related technology cannot meet the current network deployment requirement is solved.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiments of the application and together with the description serve to explain the application and do not constitute an undue limitation to the application. In the drawings:

fig. 1 is a schematic diagram of an alternative baseband signal processing system according to an embodiment of the present application;

FIG. 2 is a schematic diagram of a basic frame data arrangement according to the related art;

FIG. 3 is a schematic diagram of a data structure of an alternative target frame format according to an embodiment of the present application;

FIG. 4 is a schematic diagram of an alternative data arrangement in a target frame format according to an embodiment of the present application;

fig. 5 is a schematic diagram of the architecture of another alternative baseband signal processing system according to an embodiment of the application;

fig. 6 is a flow chart of an alternative downlink baseband signal processing method according to an embodiment of the present application;

fig. 7 is a schematic diagram of an alternative downlink baseband signal processing procedure according to an embodiment of the present application;

fig. 8 is a flow chart of an alternative uplink baseband signal processing method according to an embodiment of the present application;

fig. 9 is a schematic diagram of an alternative uplink baseband signal processing procedure according to an embodiment of the present application.

Detailed Description

In order to make the present application solution better understood by those skilled in the art, the following description will be made in detail and with reference to the accompanying drawings in the embodiments of the present application, it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, shall fall within the scope of the present application.

It should be noted that the terms "first," "second," and the like in the description and claims of this application and the accompanying drawings are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that embodiments of the present application described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

Example 1

In order to solve the technical problem that the existing general baseband processing scheme cannot meet the deployment requirement of the existing network, the embodiment of the application provides a baseband signal processing system, as shown in fig. 1, where the system at least includes: the remote convergence unit 11, the remote radio frequency unit 12, the radio frequency and antenna module 13, and the target terminal 14, wherein the remote radio frequency unit 12 includes: a digital front end (Digital Front End, DFE) chip 121 and a transceiver chip 122, the digital front end chip 121 is a system-on-chip integrated with various signal processing functions, and the target terminal 14 may be a terminal device such as a mobile phone, a tablet, a computer, etc. on the user side.

In the data downlink stage, the digital front-end chip 121 may receive the first baseband signal from the far-end aggregation unit 11, and process the first baseband signal according to a first processing manner to obtain a second baseband signal, and transmit the second baseband signal to the transceiver chip 122, where the first processing manner generally includes: de-framing, decompressing, shaping filtering, up-sampling filtering and data pre-distortion processing; the transceiver chip 122 may receive the second baseband signal, and process the second baseband signal according to a second processing manner to obtain a first radio frequency signal, and send the first radio frequency signal to the target terminal 14 through the radio frequency and antenna module 13, where the second processing manner generally includes: digital-to-analog conversion and up-mixing processing.

In the data uplink stage, the transceiver chip 122 is configured to receive the second radio frequency signal sent by the target terminal 14 through the radio frequency and antenna module 13, and process the second radio frequency signal according to a third processing manner, so as to obtain a third baseband signal, and transmit the third baseband signal to the digital front end chip 121, where the third processing manner generally includes: performing down mixing and analog-to-digital conversion; the digital front-end chip 121 is configured to receive the third baseband signal, process the third baseband signal according to a fourth processing manner, obtain a fourth baseband signal, and send the fourth baseband signal to the far-end convergence unit 11, where the fourth processing manner generally includes: downsampling filtering, shaping filtering, compressing and framing processing.

The CPU function and the FPGA function in the conventional far-end radio frequency unit design are integrated into the digital front-end chip, so that the chip function integration level is higher, the hardware cost is lower, the power consumption is lower, and the purposes of cost reduction and efficiency enhancement are realized.

Optionally, the baseband signal processing system in the embodiment of the present application is mainly designed for a low-capacity transceiving scenario, where a remote radio unit in the system and a target terminal perform signal transmission through a new air interface transmission mode of 2 transceiving channels.

In general, the processing of baseband signals by the remote radio units mainly includes: the pre-transmission processing and part of digital signal processing, wherein the pre-transmission processing mainly comprises processes of frame assembly and frame decompression, compression and decompression of baseband IQ data, and the like, the format of a data basic frame transmitted by the pre-transmission interface OTIC option8 is shown in fig. 2, and the full-load condition can accommodate the data transmission of new air interfaces of 4 transceiving channels and +2 long term evolution (Long Term Evolution, LTE) air interfaces, but if the data transmission is carried out on the new air interfaces of 2 transceiving channels with low capacity, the defect of low bandwidth resource utilization rate can occur due to the data arrangement according to the standard basic frame format, and the reduction of ACP (Average Compression Percentage ) can be caused due to the compression and decompression process, and the development resource can be increased due to the need of the shaped filter processing in the subsequent signal processing.

To solve this problem, the embodiment of the present application improves the existing Data frame format, as shown in fig. 3, in the target frame format, each radio frame includes 150 superframes, each superframe includes 256 basic frames, each basic frame includes 40 Data Words (DW), and the bit width of each Data Word is 64 bits; further, as shown in fig. 4, in each basic frame, the high 32 bits of the 1 st, 2 nd and 3 rd data words are used for storing control and supervision information; the low 32bit of the 3 rd data word and the high 32bit of the 4 th data word are reserved parts for storing automatic gain control (Automatic Gain Control, AGC) compression factors; the lower 32 bits of the 4 th data word are reserved parts; the high 32 bits of the 5 th to 36 th data words are used for storing baseband IQ data of a first receiving and transmitting channel of a new air interface, wherein the high 16 bits are used for storing real part data, and the low 16 bits are used for storing imaginary part data; the low 32 bits of the 5 th to 36 th data words are used for storing baseband IQ data of a second receiving and transmitting channel of a new air interface, wherein the high 16 bits are used for storing real part data, and the low 16 bits are used for storing imaginary part data; the 37 th and 38 th data words are reserved parts for storing the third receiving and transmitting channel data of the long term evolution air interface; the 39 th and 40 th data words are reserved parts for storing the fourth receiving and transmitting channel data of the long term evolution air interface.

By adopting the target frame format to transmit data, the bandwidth utilization rate can be increased, ACP (advanced coding protocol) simplification caused by compression or decompression process is avoided, and meanwhile, a shaping filtering process can be omitted in the subsequent signal processing process.

The filtering module is used as an important module for baseband signal processing, and is mainly used for carrying out shaping filtering and lifting sampling filtering processing on data before forward framing and after decompression, the data after the downlink direction filtering processing needs to be subjected to data predistortion processing, and the sampling rates required by different data predistortion processing schemes are different, so that when the data are subjected to filtering processing, the sampling rate conversion processing with different multiples is required for different data predistortion processing schemes, repeated development is required, and flexibility is lacking.

In order to solve the problem, the embodiment of the present application also improves the filtering module, and optionally, the filtering module of the embodiment of the present application includes: a finite length unit impulse response (Finite Impulse Response, FIR) filter for shaping filtering, a plurality of half-band filters for upsampling filtering, and a control module.

The FIR filter can eliminate ACP simplification caused by compression or decompression in the downstream direction and improve the anti-blocking index in the upstream direction. The first-stage half-band filter can realize 2 times up-sampling filtering or 2 times down-sampling filtering of the signals, and the multi-stage half-band filter can realize 2, 4, 8 and … times up-sampling of the signals by combination; the control module can determine corresponding filtering configuration information according to a specific data predistortion processing scheme, wherein the filtering configuration information comprises types and numbers of filters to be called, and then the filters corresponding to the filtering configuration information are called to carry out filtering processing on the received signals.

Taking a filtering module as an example, a first-stage FIR filter and a 4-stage half-band filter are adopted, the filtering module can realize up-and-down sampling processing by 16 times at maximum. The control configuration information may be used as the control enable signal, where bit0 is an enable signal of the FIR filter, bit1 is an enable signal of the 1-stage half-band filter, bit2 is an enable signal of the 2-stage half-band filter, bit3 is an enable signal of the three-stage half-band filter, and bit4 is an enable signal of the four-stage half-band filter, for example, the baseband signal is subjected to shaping filtering and 4-fold upsampling, and the control array is set to 5' b 00111. And the control array is read and written through the register interface, and flexible reconfiguration of the shaping filtering and the elevation sampling filtering can be realized by setting different parameters.

Fig. 5 is a schematic structural diagram of a more specific baseband signal processing system according to an embodiment of the present application, and the following describes the structural function of the remote rf unit with reference to fig. 5.

As shown in fig. 5, the digital front-end chip 121 includes: the device comprises a forward interface module 1211, a filtering module 1212 and a data predistortion processing module 1213, wherein the forward interface module 1211 can select CPRI (Common Public Radio Interface, common public wireless interface); the transceiver chip 122 includes: a signal conversion module 1221 and a mixing module 1222.

In the data downlink stage, the forwarding interface module 1211 performs frame de-encoding on the first baseband signal in the target frame format to obtain a fifth baseband signal and first control and supervision information, and encapsulates the first control and supervision information into a register and writes the register into the CPU, where the fifth baseband signal includes: first baseband IQ data corresponding to a first receiving and transmitting channel, and second baseband IQ data corresponding to a second receiving and transmitting channel; the filtering module 1212 performs up-sampling filtering on the fifth baseband signal to obtain a sixth baseband signal; the data predistortion processing module 1213 is configured to perform data predistortion processing on the sixth baseband signal, to obtain a second baseband signal; the signal conversion module 1221 performs digital-to-analog conversion processing on the second baseband signal to obtain an eighth baseband signal; the mixing module 1222 performs up-mixing processing on the eighth baseband signal to obtain a first radio frequency signal.

In the data uplink stage, the mixing module 1222 performs a down-mixing process on the second radio frequency signal to obtain a ninth baseband signal; the signal conversion module 1221 performs analog-to-digital conversion processing on the ninth baseband signal to obtain a third baseband signal; the filtering module 1212 performs downsampling filtering and shaping filtering processing on the third baseband signal in sequence to obtain a seventh baseband signal; the forwarding interface module 1211 obtains the second control and supervision information from the CPU, and performs framing processing on the seventh baseband signal and the second control and supervision information according to the target frame format, so as to obtain a fourth baseband signal, where the seventh baseband signal includes: third baseband IQ data corresponding to the first receiving and transmitting channel, and fourth baseband IQ data corresponding to the second receiving and transmitting channel.

Optionally, the digital front-end chip 121 further includes a high-speed serial data interface 1214, and the transceiver chip 122 further includes a high-speed serial data interface 1223, where the digital front-end chip 121 and the transceiver chip 122 transmit the second baseband signal and the third baseband signal through the high-speed serial data interface, and the high-speed serial data interface may be a JESD204B interface.

In the embodiment of the present application, the remote radio unit includes: a digital front-end chip and a transceiver chip; in a data downlink stage, a digital front-end chip receives a first baseband signal from a far-end convergence unit, processes the first baseband signal by frame decompression, shaping filtering, up-sampling filtering, data predistortion and the like to obtain a second baseband signal, and a transceiver chip carries out digital-to-analog conversion and up-mixing processing on the second baseband signal to obtain a first radio frequency signal and sends the first radio frequency signal to a target terminal through a radio frequency and antenna module; in the data uplink stage, the receiving and transmitting chip receives a second radio frequency signal sent by the target terminal through the radio frequency and antenna module, performs down-mixing and analog-to-digital conversion processing on the second radio frequency signal to obtain a third baseband signal, and the digital front-end chip performs down-sampling filtering, shaping filtering, compression, framing and other processing on the third baseband signal to obtain a fourth baseband signal, and sends the fourth baseband signal to the far-end convergence unit. The CPU function and the FPGA function in the conventional far-end radio frequency unit design are integrated into the digital front-end chip, so that the chip function integration level is higher, the hardware cost is lower, the power consumption is smaller, the purposes of cost reduction and efficiency improvement are realized, and the technical problem that the general baseband processing scheme in the related technology cannot meet the current network deployment requirement is solved.

Example 2

On the basis of the baseband signal processing system provided in embodiment 1, the present embodiment further provides a downlink baseband signal processing method implemented by a remote radio unit, where it should be noted that the steps illustrated in the flowchart of the drawing may be performed in a computer system such as a set of computer executable instructions, and although a logic sequence is illustrated in the flowchart, in some cases, the steps illustrated or described may be performed in a sequence different from that illustrated herein.

Fig. 6 is a flowchart of an alternative downlink baseband signal processing method according to an embodiment of the present application, as shown in fig. 6, where the method includes the following steps:

step S602, a digital front-end chip receives a first baseband signal from a far-end convergence unit, processes the first baseband signal according to a first processing mode to obtain a second baseband signal, and transmits the second baseband signal to a transceiver chip, wherein the first processing mode comprises at least one of the following steps: de-framing, decompressing, shaping filtering, up-sampling filtering and data pre-distortion processing;

step S604, receiving the second baseband signal through the transceiver chip, and processing the second baseband signal according to a second processing mode to obtain a first radio frequency signal, and sending the first radio frequency signal to the target terminal through the radio frequency and antenna module, wherein the second processing mode comprises at least one of the following steps: digital-to-analog conversion and up-mixing processing.

The steps of the downlink baseband signal processing method are described below in connection with specific implementation procedures.

As an alternative implementation manner, a first baseband signal in a target frame format from a far-end convergence unit may be received through a forwarding interface module in a digital front-end chip, the first baseband signal is de-framed to obtain a fifth baseband signal and first control and supervision information, the first control and supervision information is packaged into a register and written into a CPU, and the fifth baseband signal includes: first baseband IQ data corresponding to a first receiving and transmitting channel, and second baseband IQ data corresponding to a second receiving and transmitting channel; then, up-sampling filtering processing is carried out on the fifth baseband signal through a filtering module in the digital front-end chip to obtain a sixth baseband signal; and then, carrying out data predistortion processing on the sixth baseband signal through a data predistortion processing module in the digital front-end chip to obtain a second baseband signal, and transmitting the second baseband signal to the transceiver chip.

Then, digital-to-analog conversion processing is carried out on the received second baseband signal through a signal conversion module in the receiving and transmitting chip, so as to obtain an eighth baseband signal; and then, carrying out up-mixing processing on the eighth baseband signal through a frequency mixing module in the transceiver chip to obtain a first radio frequency signal, and sending the first radio frequency signal to the target terminal through the radio frequency and antenna module.

In the above target frame format, each radio frame includes 150 superframes, each superframe includes 256 basic frames, each basic frame includes 40 data words, and each data word has a bit width of 64 bits; in each basic frame, the high 32bit of the 1 st, 2 nd and 3 rd data words is used for storing control and supervision information; the low 32bit of the 3 rd data word and the high 32bit of the 4 th data word are reserved parts for storing the automatic gain control compression factors; the lower 32 bits of the 4 th data word are reserved parts; the high 32 bits of the 5 th to 36 th data words are used for storing baseband IQ data of a first receiving and transmitting channel of a new air interface, wherein the high 16 bits are used for storing real part data, and the low 16 bits are used for storing imaginary part data; the low 32 bits of the 5 th to 36 th data words are used for storing baseband IQ data of a second receiving and transmitting channel of a new air interface, wherein the high 16 bits are used for storing real part data, and the low 16 bits are used for storing imaginary part data; the 37 th and 38 th data words are reserved parts for storing the third receiving and transmitting channel data of the long term evolution air interface; the 39 th and 40 th data words are reserved parts for storing the fourth receiving and transmitting channel data of the long term evolution air interface.

By adopting the target frame format to transmit data, the bandwidth utilization rate can be increased, ACP (advanced coding protocol) simplification caused by compression or decompression process is avoided, and meanwhile, a shaping filtering process can be omitted in the subsequent signal processing process.

Optionally, the filtering module includes: the device comprises an FIR filter for shaping filtering, a plurality of half-band filters for upsampling filtering and a control module. The FIR filter can eliminate ACP reduction caused by compression or decompression in the downstream direction. The first-stage half-band filter can realize 2 times up-sampling filtering or 2 times down-sampling filtering of the signals, and the multi-stage half-band filter can realize 2, 4, 8 and … times up-sampling of the signals by combination; the control module can determine corresponding filtering configuration information according to a specific data predistortion processing scheme, wherein the filtering configuration information comprises types and numbers of filters to be called, and then the filters corresponding to the filtering configuration information are called to carry out filtering processing on the received signals.

The filter configuration information is read and written through the register interface, and flexible reconfiguration of forming filtering and lifting sampling filtering can be realized by setting different parameters.

Fig. 7 is a schematic diagram of a specific downlink baseband signal processing procedure according to an embodiment of the present application, including the following steps:

s1, a far-end convergence unit transmits a first baseband signal to a digital front-end chip of a far-end radio frequency unit through a serdes interface, wherein the first baseband signal is target frame format data based on CPRI protocol, and the transmission rate is 10.1376Gbps;

S2, the digital front-end chip carries out frame decomposition processing on the first baseband signal according to a target frame format to obtain a fifth baseband signal and first control and supervision information;

s3, the digital front-end chip packages the first control and supervision information into a register and writes the first control and supervision information into the CPU;

s4, the digital front-end chip maps first baseband IQ data in the fifth baseband signal to a first receiving and transmitting channel according to a target frame format, and maps second baseband IQ data to a second receiving and transmitting channel;

s5, the fifth baseband signal is not compressed during forward transmission, so ACP simplification does not occur, forming filtering is not needed in the downlink direction, and the digital front-end chip directly performs up-sampling filtering processing on the fifth baseband signal to obtain a sixth baseband signal; since the fifth baseband signal input sampling rate is 122.88Msps, and the data predistortion processing scheme requires the input sampling rate to be 491.52Msps, namely 4 times of up-sampling filtering processing is needed, a two-stage half-band filter is selected, and a filtering control array is set to be 5' b00110;

s6, the digital front-end chip performs data predistortion processing on the sixth baseband signal to obtain a second baseband signal; the sampling rate of the data predistortion processing module is 491.52Msps, modeling analysis is carried out according to the forward data and the data of the feedback channel, the power of the PA port is ensured to be linear output, and the ACPR (Adjacent Channel Power Ratio ) index meets-45 dBc;

S7, the digital front-end chip integrates the data of the second baseband signal according to the corresponding channel and transmits the second baseband signal to the transceiver chip through the JESD204B interface;

s8, the receiving and transmitting chip performs data mapping on the second baseband signal according to a mapping relation, performs digital-to-analog conversion processing, and obtains an eighth baseband signal, wherein the converted bit width is 14 bits, and the sampling rate is 491.52 Msps;

s9, the receiving and transmitting chip carries out up-mixing processing on the eighth baseband signal, the carrier frequency band is 3.4 GHz-3.5 GHz, a first radio frequency signal is obtained, and the first radio frequency signal is sent to the target terminal through the radio frequency and antenna module.

In the embodiment of the application, in the data downlink stage, the remote radio frequency unit receives a first baseband signal from the remote convergence unit through the digital front end chip, processes the first baseband signal by frame decompression, shaping filtering, up-sampling filtering, data predistortion and the like to obtain a second baseband signal, processes the second baseband signal by digital-to-analog conversion and up-mixing through the transceiver chip to obtain a first radio frequency signal, and sends the first radio frequency signal to the target terminal through the radio frequency and antenna module. The CPU function and the FPGA function in the conventional far-end radio frequency unit design are integrated into the digital front-end chip, so that the chip function integration level is higher, the hardware cost is lower, the power consumption is smaller, the purposes of cost reduction and efficiency improvement are realized, and the technical problem that the general baseband processing scheme in the related technology cannot meet the current network deployment requirement is solved.

Example 3

On the basis of the baseband signal processing system provided in embodiment 1, the embodiment of the present application further provides an uplink baseband signal processing method implemented by a remote radio unit, where it should be noted that the steps illustrated in the flowchart of the drawing may be performed in a computer system such as a set of computer executable instructions, and although a logic sequence is illustrated in the flowchart, in some cases, the steps illustrated or described may be performed in a different sequence than that illustrated herein.

Fig. 8 is a flowchart of an alternative uplink baseband signal processing method according to an embodiment of the present application, as shown in fig. 8, where the method includes the following steps:

step S802, a receiving and transmitting chip receives a second radio frequency signal sent by a target terminal through a radio frequency and antenna module, processes the second radio frequency signal according to a third processing mode to obtain a third baseband signal, and transmits the third baseband signal to a digital front-end chip, wherein the third processing mode comprises at least one of the following steps: performing down mixing and analog-to-digital conversion;

step S804, receiving a third baseband signal through the digital front-end chip, and processing the third baseband signal according to a fourth processing mode to obtain a fourth baseband signal, and sending the fourth baseband signal to the far-end convergence unit, wherein the fourth processing mode comprises at least one of the following steps: downsampling filtering, shaping filtering, compressing and framing processing.

The steps of the baseband signal processing method are described below in connection with specific implementation procedures.

As an optional implementation manner, the frequency mixing module in the transceiver chip may perform a frequency mixing process on the second radio frequency signal sent by the target terminal through the radio frequency and antenna module to obtain a ninth baseband signal; and then, carrying out analog-to-digital conversion processing on the ninth baseband signal through a signal conversion module in the receiving and transmitting chip to obtain a third baseband signal, and transmitting the third baseband signal to the digital front-end chip.

Then, the third baseband signal can be subjected to downsampling filtering and shaping filtering processing in sequence through a filtering module in the transceiver chip to obtain a seventh baseband signal; and acquiring second control and supervision information from the CPU through a forwarding interface module in the transceiver chip, and framing the seventh baseband signal and the second control and supervision information according to a target frame format to obtain a fourth baseband signal, wherein the seventh baseband signal comprises: and transmitting the third baseband IQ data corresponding to the first receiving and transmitting channel, the fourth baseband IQ data corresponding to the second receiving and transmitting channel and finally transmitting the fourth baseband signal to the far-end convergence unit.

In the above target frame format, each radio frame includes 150 superframes, each superframe includes 256 basic frames, each basic frame includes 40 data words, and each data word has a bit width of 64 bits; in each basic frame, the high 32bit of the 1 st, 2 nd and 3 rd data words is used for storing control and supervision information; the low 32bit of the 3 rd data word and the high 32bit of the 4 th data word are reserved parts for storing the automatic gain control compression factors; the lower 32 bits of the 4 th data word are reserved parts; the high 32 bits of the 5 th to 36 th data words are used for storing baseband IQ data of a first receiving and transmitting channel of a new air interface, wherein the high 16 bits are used for storing real part data, and the low 16 bits are used for storing imaginary part data; the low 32 bits of the 5 th to 36 th data words are used for storing baseband IQ data of a second receiving and transmitting channel of a new air interface, wherein the high 16 bits are used for storing real part data, and the low 16 bits are used for storing imaginary part data; the 37 th and 38 th data words are reserved parts for storing the third receiving and transmitting channel data of the long term evolution air interface; the 39 th and 40 th data words are reserved parts for storing the fourth receiving and transmitting channel data of the long term evolution air interface.

By adopting the target frame format to transmit data, the bandwidth utilization rate can be increased, ACP (advanced coding protocol) simplification caused by compression or decompression process is avoided, and meanwhile, a shaping filtering process can be omitted in the subsequent signal processing process.

Optionally, the filtering module includes: the device comprises an FIR filter for shaping filtering, a plurality of half-band filters for upsampling filtering and a control module. The FIR filter can raise the anti-blocking index in the upstream direction. The first-stage half-band filter can realize 2 times up-sampling filtering or 2 times down-sampling filtering of the signals, and the multi-stage half-band filter can realize 2, 4, 8 and … times up-sampling of the signals by combination; the control module can determine corresponding filtering configuration information according to a specific data predistortion processing scheme, wherein the filtering configuration information comprises types and numbers of filters to be called, and then the filters corresponding to the filtering configuration information are called to carry out filtering processing on the received signals.

The filter configuration information is read and written through the register interface, and flexible reconfiguration of forming filtering and lifting sampling filtering can be realized by setting different parameters.

Fig. 9 is a schematic diagram of a specific uplink baseband signal processing procedure according to an embodiment of the present application, including the following steps:

S1, a terminal sends a second radio frequency signal;

s2, the receiving and transmitting chip receives a second radio frequency signal through the radio frequency and antenna module and performs down mixing processing to obtain a ninth baseband signal;

s3, the receiving and transmitting chip carries out analog-to-digital conversion processing on the ninth baseband signal, the sampling bit width is 12 bits, the sampling rate is 245.76Msps, and a third baseband signal is obtained;

s4, the receiving and transmitting chip transmits a third baseband signal to the digital front-end chip through the JESD204B interface according to the channel mapping relation;

s5, the digital front-end chip demaps the third baseband signal, performs downsampling filtering treatment, and reduces the data sampling rate from 245.76Msps to 122.88Msps; in order to meet the uplink anti-blocking index, performing shaping filtering processing on the data after the downsampling filtering to obtain a seventh baseband signal; the filter type is an FIR filter, and the filter module control array is set to be 5' b00011 because the filter module needs first-level downsampling filtering and shaping filtering treatment;

s6, the digital front-end chip maps third baseband IQ data in the seventh baseband signal to the first receiving and dispatching channel according to the target frame format, and maps fourth baseband IQ data to the second receiving and dispatching channel;

s7, the digital front-end chip acquires second control and supervision information from the CPU;

S8: the digital front-end chip carries out framing processing on the seventh baseband signal and the second control and supervision information according to a target frame format to obtain a fourth baseband signal;

s9: the digital front-end chip sends the fourth baseband signal to the far-end convergence unit.

In this embodiment of the present application, in the data uplink stage, the remote radio frequency unit receives, through the transceiver chip, the second radio frequency signal sent by the target terminal through the radio frequency and antenna module, performs down-mixing and analog-to-digital conversion processing on the second radio frequency signal to obtain a third baseband signal, performs, through the digital front end chip, processing such as downsampling filtering, shaping filtering, compression, framing, etc. on the third baseband signal to obtain a fourth baseband signal, and sends the fourth baseband signal to the remote convergence unit. The CPU function and the FPGA function in the conventional far-end radio frequency unit design are integrated into the digital front-end chip, so that the chip function integration level is higher, the hardware cost is lower, the power consumption is smaller, the purposes of cost reduction and efficiency improvement are realized, and the technical problem that the general baseband processing scheme in the related technology cannot meet the current network deployment requirement is solved.

Example 4

According to an embodiment of the present application, there is also provided a nonvolatile storage medium including a stored computer program, where a device in which the nonvolatile storage medium is located executes the baseband signal processing method in embodiment 1 by running the computer program.

According to an embodiment of the present application, there is also provided a processor for running a computer program, where the computer program when running performs the baseband signal processing method of embodiment 1.

According to an embodiment of the present application, there is also provided an electronic device including: a memory and a processor, wherein the memory stores a computer program, and the processor is configured to execute the baseband signal processing method in embodiment 1 by the computer program.

Alternatively, the computer program may perform the steps of: the method comprises the steps of receiving a first baseband signal from a far-end convergence unit through a digital front-end chip, processing the first baseband signal according to a first processing mode to obtain a second baseband signal, and transmitting the second baseband signal to a receiving-transmitting chip, wherein the first processing mode comprises at least one of the following steps: de-framing, decompressing, shaping filtering, up-sampling filtering and data pre-distortion processing; receiving a second baseband signal through a transceiver chip, processing the second baseband signal according to a second processing mode to obtain a first radio frequency signal, and sending the first radio frequency signal to a target terminal through a radio frequency and antenna module, wherein the second processing mode comprises at least one of the following steps: digital-to-analog conversion and up-mixing processing.

Optionally, the computer program may also perform the steps of: the receiving and transmitting chip receives a second radio frequency signal sent by the target terminal through the radio frequency and antenna module, processes the second radio frequency signal according to a third processing mode to obtain a third baseband signal, and transmits the third baseband signal to the digital front-end chip, wherein the third processing mode comprises at least one of the following steps: performing down mixing and analog-to-digital conversion; receiving a third baseband signal through the digital front-end chip, processing the third baseband signal according to a fourth processing mode to obtain a fourth baseband signal, and sending the fourth baseband signal to the far-end convergence unit, wherein the fourth processing mode comprises at least one of the following steps: downsampling filtering, shaping filtering, compressing and framing processing.

The foregoing embodiment numbers are merely for the purpose of description and do not represent the advantages or disadvantages of the embodiments.

In the foregoing embodiments of the present application, the descriptions of the embodiments are emphasized, and for a portion of this disclosure that is not described in detail in this embodiment, reference is made to the related descriptions of other embodiments.

In the several embodiments provided in the present application, it should be understood that the disclosed technology content may be implemented in other manners. The above-described embodiments of the apparatus are merely exemplary, and the division of units may be a logic function division, and there may be another division manner in actual implementation, for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be through some interfaces, units or modules, or may be in electrical or other forms.

The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed over a plurality of units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

In addition, each functional unit in each embodiment of the present application may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in software functional units.

The integrated units, if implemented in the form of software functional units and sold or used as stand-alone products, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application may be embodied in essence or a part contributing to the prior art or all or part of the technical solution, in the form of a software product stored in a storage medium, including several instructions to cause a computer device (which may be a personal computer, a server or a network device, etc.) to perform all or part of the steps of the methods of the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), a removable hard disk, a magnetic disk, or an optical disk, or other various media capable of storing program codes.

The foregoing is merely a preferred embodiment of the present application and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present application and are intended to be comprehended within the scope of the present application.

Claims (12)

1. A remote radio unit comprising: a digital front-end chip and a transceiver chip, wherein,

in the data downlink stage, the digital front-end chip is configured to receive a first baseband signal from a far-end convergence unit, process the first baseband signal according to a first processing mode to obtain a second baseband signal, and transmit the second baseband signal to the transceiver chip, where the first processing mode includes at least one of the following: de-framing, decompressing, shaping filtering, up-sampling filtering and data pre-distortion processing; the transceiver chip is configured to receive the second baseband signal, process the second baseband signal according to a second processing manner, obtain a first radio frequency signal, and send the first radio frequency signal to a target terminal through a radio frequency and antenna module, where the second processing manner includes at least one of: digital-to-analog conversion and up-mixing processing;

In the data uplink stage, the transceiver chip is configured to receive a second radio frequency signal sent by the target terminal through the radio frequency and antenna module, process the second radio frequency signal according to a third processing mode to obtain a third baseband signal, and transmit the third baseband signal to the digital front-end chip, where the third processing mode includes at least one of the following: performing down mixing and analog-to-digital conversion; the digital front-end chip is configured to receive the third baseband signal, process the third baseband signal according to a fourth processing manner, obtain a fourth baseband signal, and send the fourth baseband signal to the far-end convergence unit, where the fourth processing manner includes at least one of the following: downsampling filtering, shaping filtering, compressing and framing processing.

2. The remote radio unit of claim 1, wherein,

and the remote radio frequency unit and the target terminal perform signal transmission in a new air interface transmission mode of two receiving and transmitting channels.

3. The remote radio unit of claim 2, wherein,

the first baseband signal and the fourth baseband signal are data in a target frame format, wherein in the target frame format, each radio frame comprises 150 superframes, each superframe comprises 256 basic frames, each basic frame comprises 40 data words, and the bit width of each data word is 64 bits;

In each basic frame, the high 32bit of the 1 st, 2 nd and 3 rd data words is used for storing control and supervision information; the low 32bit of the 3 rd data word and the high 32bit of the 4 th data word are reserved parts for storing the automatic gain control compression factors; the lower 32 bits of the 4 th data word are reserved parts; the high 32 bits of the 5 th to 36 th data words are used for storing baseband IQ data of a first receiving and transmitting channel of a new air interface, wherein the high 16 bits are used for storing real part data, and the low 16 bits are used for storing imaginary part data; the low 32 bits of the 5 th to 36 th data words are used for storing baseband IQ data of a second receiving and transmitting channel of a new air interface, wherein the high 16 bits are used for storing real part data, and the low 16 bits are used for storing imaginary part data; the 37 th and 38 th data words are reserved parts for storing the third receiving and transmitting channel data of the long term evolution air interface; the 39 th and 40 th data words are reserved parts for storing the fourth receiving and transmitting channel data of the long term evolution air interface.

4. The remote radio unit of claim 3, wherein the digital front-end chip comprises: the device comprises a forward interface module, a filtering module and a data predistortion processing module, wherein,

in the data downlink stage, the forwarding interface module is configured to de-frame the first baseband signal in the target frame format to obtain a fifth baseband signal and first control and supervision information, and encapsulate the first control and supervision information into a register and write the register into a CPU, where the fifth baseband signal includes: the first baseband IQ data corresponding to the first receiving and transmitting channel, and the second baseband IQ data corresponding to the second receiving and transmitting channel; the filtering module is used for carrying out up-sampling filtering processing on the fifth baseband signal to obtain a sixth baseband signal; the data predistortion processing module is used for performing data predistortion processing on the sixth baseband signal to obtain the second baseband signal;

In the data uplink stage, the filtering module is used for sequentially carrying out downsampling filtering and shaping filtering processing on the third baseband signal to obtain a seventh baseband signal; the forwarding interface module is configured to obtain second control and supervision information from the CPU, and perform framing processing on the seventh baseband signal and the second control and supervision information according to the target frame format to obtain the fourth baseband signal, where the seventh baseband signal includes: and third baseband IQ data corresponding to the first receiving and transmitting channel, and fourth baseband IQ data corresponding to the second receiving and transmitting channel.

5. The remote radio unit of claim 4, wherein the filtering module comprises: a finite length unit impulse response filter for shaping filtering, a plurality of half-band filters for upsampling filtering, a control module, wherein,

the control module is configured to determine filtering configuration information, and call a filter corresponding to the filtering configuration information to perform filtering processing on a received signal, where the filtering configuration information includes: the type and number of filters that need to be invoked.

6. The remote radio unit of claim 4, wherein the transceiver chip comprises: a signal conversion module and a mixing module, wherein,

In the data downlink stage, the signal conversion module is configured to perform digital-to-analog conversion processing on the second baseband signal to obtain an eighth baseband signal; the frequency mixing module is configured to perform an up-mixing process on the eighth baseband signal to obtain the first radio frequency signal;

in the data uplink stage, the frequency mixing module is configured to perform a frequency mixing process on the second radio frequency signal to obtain a ninth baseband signal; and the signal conversion module is used for carrying out analog-to-digital conversion processing on the ninth baseband signal to obtain the third baseband signal.

7. The remote radio unit of claim 1, wherein the digital front-end chip and the transceiver chip each comprise: a high-speed serial data interface, wherein,

the digital front-end chip and the transceiver chip transmit the second baseband signal and the third baseband signal through the high-speed serial data interface.

8. A baseband signal processing method applied to a remote radio unit, comprising:

the method comprises the steps of receiving a first baseband signal from a far-end convergence unit through a digital front-end chip, processing the first baseband signal according to a first processing mode to obtain a second baseband signal, and transmitting the second baseband signal to a receiving-transmitting chip, wherein the first processing mode comprises at least one of the following steps: de-framing, decompressing, shaping filtering, up-sampling filtering and data pre-distortion processing;

The second baseband signal is received through the transceiver chip, the second baseband signal is processed according to a second processing mode, a first radio frequency signal is obtained, the first radio frequency signal is sent to a target terminal through a radio frequency and antenna module, and the second processing mode comprises at least one of the following steps: digital-to-analog conversion and up-mixing processing.

9. A baseband signal processing method applied to a remote radio unit, comprising:

the method comprises the steps that a receiving and transmitting chip receives a second radio frequency signal sent by a target terminal through a radio frequency and antenna module, the second radio frequency signal is processed according to a third processing mode, a third baseband signal is obtained, the third baseband signal is transmitted to a digital front-end chip, and the third processing mode comprises at least one of the following steps: performing down mixing and analog-to-digital conversion;

receiving the third baseband signal through the digital front-end chip, and processing the third baseband signal according to a fourth processing mode to obtain a fourth baseband signal, and sending the fourth baseband signal to a far-end convergence unit, wherein the fourth processing mode comprises at least one of the following steps: downsampling filtering, shaping filtering, compressing and framing processing.

10. A baseband signal processing system, comprising: the system comprises a far-end convergence unit, a far-end radio frequency unit, a radio frequency and antenna module and a target terminal, wherein the far-end radio frequency unit comprises: a digital front-end chip and a transceiver chip;

in the data downlink stage, the digital front-end chip is configured to receive a first baseband signal from the far-end aggregation unit, process the first baseband signal according to a first processing mode to obtain a second baseband signal, and transmit the second baseband signal to the transceiver chip, where the first processing mode includes at least one of the following: de-framing, decompressing, shaping filtering, up-sampling filtering and data pre-distortion processing; the transceiver chip is configured to receive the second baseband signal, process the second baseband signal according to a second processing manner, obtain a first radio frequency signal, and send the first radio frequency signal to the target terminal through the radio frequency and antenna module, where the second processing manner includes at least one of: digital-to-analog conversion and up-mixing processing;

in the data uplink stage, the transceiver chip is configured to receive a second radio frequency signal sent by the target terminal through the radio frequency and antenna module, process the second radio frequency signal according to a third processing mode to obtain a third baseband signal, and transmit the third baseband signal to the digital front-end chip, where the third processing mode includes at least one of the following: performing down mixing and analog-to-digital conversion; the digital front-end chip is configured to receive the third baseband signal, process the third baseband signal according to a fourth processing manner, obtain a fourth baseband signal, and send the fourth baseband signal to the far-end convergence unit, where the fourth processing manner includes at least one of the following: downsampling filtering, shaping filtering, compressing and framing processing.

11. A non-volatile storage medium, characterized in that the non-volatile storage medium comprises a stored computer program, wherein the device in which the non-volatile storage medium is located performs the baseband signal processing method according to claim 8 or 9 by running the computer program.

12. An electronic device, comprising: a memory and a processor, wherein the memory has stored therein a computer program, the processor being configured to execute the baseband signal processing method according to claim 8 or 9 by means of the computer program.