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WO2013023595A1 - Procédé et appareil de synchronisation de fréquences et de réception de signal de diffusion audio numérique - Google Patents

Procédé et appareil de synchronisation de fréquences et de réception de signal de diffusion audio numérique Download PDF

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Publication number
WO2013023595A1
WO2013023595A1 PCT/CN2012/080170 CN2012080170W WO2013023595A1 WO 2013023595 A1 WO2013023595 A1 WO 2013023595A1 CN 2012080170 W CN2012080170 W CN 2012080170W WO 2013023595 A1 WO2013023595 A1 WO 2013023595A1
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WO
WIPO (PCT)
Prior art keywords
digital audio
spectrum
broadcast signal
audio broadcast
current
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CN2012/080170
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English (en)
Chinese (zh)
Inventor
雷文
高鹏
邸娜
曹晓卫
王伟平
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
TIMI TECHNOLOGIES Co Ltd
Academy of Broadcasting Science Research Institute
Original Assignee
TIMI TECHNOLOGIES Co Ltd
Academy of Broadcasting Science Research Institute
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by TIMI TECHNOLOGIES Co Ltd, Academy of Broadcasting Science Research Institute filed Critical TIMI TECHNOLOGIES Co Ltd
Publication of WO2013023595A1 publication Critical patent/WO2013023595A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2647—Arrangements specific to the receiver only
    • H04L27/2655—Synchronisation arrangements
    • H04L27/2657—Carrier synchronisation

Definitions

  • the present invention relates to the field of digital information transmission technologies, and more particularly to a method and apparatus for frequency synchronization and reception of digital audio broadcast signals in a digital audio broadcasting system. Background technique
  • the traditional FM band (87Mhz-108Mhz) is an FM broadcast band, which occupies 100KH or 200KHz. It can only provide users with the most basic broadcast services. At present, China still uses traditional analog FM radio.
  • the use of digital audio broadcasting to provide digital audio and data services, broadcast, point-to-multipoint, a little bit opposite, the cost of broadcast information is independent of the number of users and sound quality, high reception quality, strong anti-interference, low transmission power, coverage large area. Whether it's audio quality, spectrum efficiency or support for new services, it has unparalleled advantages over traditional analog broadcasts.
  • the main digital audio broadcasting technologies in the world mainly include the following:
  • DAB COFDM-based multi-carrier broadband transmission technology.
  • DAB technology has greatly improved performance against frequency selective fading caused by multipath propagation of electric waves.
  • the channel bandwidth of the 1.432MHz DAB standard is completely incompatible with analog FM/AM broadcasting.
  • New working frequency bands and frequency planning are needed, which poses a great obstacle to the promotion of DAB.
  • the terminal receiver It is difficult to control in terms of cost and power consumption.
  • HD Radio uses the carrier sidebands currently assigned to AM/FM analog stations to transmit digital audio signals and gradually achieves a smooth transition from analog to digital.
  • the same frequency compatibility with traditional analog broadcasting has enabled HD Radio technology to be rapidly promoted in the United States, but since the frequency planning of AM/FM in other countries including China is different from that in the United States, and the corresponding spectrum mask is also It is much stricter than the FCC regulations.
  • HD Radio uses fixed sideband and fixed sideband transmit power technology, which makes it interfere with existing analog coverage in other countries. It is difficult to have a large area in the world. Promotion.
  • DRM Digital Multimedia Subsystem
  • DRM Digital Multimedia Subsystem
  • DRM can broadcast on the uplink/downstream of analog broadcasts or occupy a single broadcast channel. This method is flexible, and the digital spectrum can be placed in the least interference mode according to the situation of neighboring stations. The transmission of the transmit power is adjusted to protect the existing analog broadcast from being affected.
  • the DRM system is a narrowband system like the traditional analog audio broadcasting. For frequency selective fading caused by multipath propagation of radio waves, frequency diversity cannot be achieved, and system performance is not ideal. And the DRM system can only support one broadcast channel band of lOOkhz, and can't support higher service data volume.
  • the biggest difficulty encountered in the promotion of digital audio broadcasting technology is how to fully utilize advanced digital communication technology to improve the transmission quality, while at the same time taking into account the compatibility with analog broadcasting and frequency planning to meet the business needs of different users. It provides a flexible spectrum combination mode, which not only supports single-bandwidth service transmission but also supports flexible combination of multiple bandwidths, and supports larger transmission rate requirements by supporting larger transmission bandwidth. Moreover, based on the existing FM/AM transmitting equipment, a small amount of equipment and a small amount of investment can be added, and the digital audio signal can be transmitted on the same channel as the original analog broadcast signal. In this way, the original analog system is retained. On the other hand, it is not necessary to prepare a new frequency plan to achieve the purpose of frequency reuse. Summary of the invention
  • the object of the present invention is to solve at least one of the above technical drawbacks, and in particular to a digital audio broadcasting system based on a multi-spectral mode, the present invention provides a digital audio broadcasting signal frequency synchronization and receiving method and apparatus therefor, by which the method can be Efficiently and quickly identify the spectrum combination mode in the current digital audio broadcast signal, and realize the need for high-capacity multi-service data reception under digital audio broadcasting.
  • a digital audio broadcast signal frequency synchronization and reception method comprising the steps of: a receiver adjusting a front end set frequency point, demodulating a digital audio broadcast signal in a subband; extracting system information The current subband nominal frequency point information included in the current subband and the spectrum mode index information used by the current digital audio broadcast signal; the spectral mode index information used according to the extracted current subband nominal frequency point information and the current digital audio broadcast signal Adjust the front-end frequency point setting of the receiver to complete the frequency center point synchronization in the current digital audio broadcast signal spectrum mode.
  • the digital audio broadcast signal within the one subband is a digital audio broadcast signal within the chirp band.
  • the spectrum mode includes 39, and the system information includes 6 bit information for indicating a spectrum mode index, wherein the spectrum mode index 1-8 is a pure digital mode, and the spectrum mode index 9-21 is a stereo FM simulating mode, and the spectrum is Mode index 22-39 is mono FM simulating mode; spectrum mode index 1,3,5,7,10,14,15,18,22,24,25,26,29,30,32,33,38
  • the remaining indexes are ⁇ class spectrum modes
  • the correspondence between the spectrum mode indexes 1-39 and the occupied subbands is as follows:
  • the system information includes 4 bits for indicating the current subband nominal frequency point position, and the subband nominal frequency point position is 50KHz as the frequency step.
  • a digital audio broadcast signal frequency synchronization and receiving apparatus includes: a system information processing module, configured to deinterleave and decode system information in a digital audio broadcast signal within a subband
  • the current subband has nominal frequency point information and the spectrum mode index information used by the current digital audio broadcast signal;
  • the frequency point and filter setting module is configured to use the extracted current subband nominal frequency point information and the current digital audio broadcast signal
  • the spectrum mode index information used is adjusted to adjust the front-end frequency point setting of the receiver to complete the frequency center point synchronization in the current digital audio broadcast signal spectrum mode.
  • the digital audio broadcast signal within the one subband is a digital broadcast signal within the chirp band.
  • the frequency point and filter setting module is further configured to perform an effective subband center frequency point setting according to a frequency step of 50 kHz, and obtain a valid signal in a subband bandwidth at a current center frequency point by using a filter corresponding thereto.
  • the device further includes: a timing and carrier frequency offset estimation module, configured to perform timing and carrier frequency offset estimation on the current subband signal; and a channel estimation and equalization module, configured to perform channel estimation after acquiring timing and carrier frequency offset estimation Data equalization; data information symbol extraction module; for performing effective data symbol extraction on the channel after channel estimation and data equalization; deinterleaving and decoding module, for obtaining data bit information carried by the digital broadcast.
  • a timing and carrier frequency offset estimation module configured to perform timing and carrier frequency offset estimation on the current subband signal
  • a channel estimation and equalization module configured to perform channel estimation after acquiring timing and carrier frequency offset estimation Data equalization
  • data information symbol extraction module for performing effective data symbol extraction on the channel after channel estimation and data equalization
  • deinterleaving and decoding module for obtaining data bit information carried by the digital broadcast.
  • the spectrum mode includes 39, and the system information includes 6 bit information for indicating a spectrum mode index, wherein the spectrum mode index 1-8 is a pure digital mode, and the spectrum mode index 9-21 is a stereo FM simulating mode, and the spectrum is Mode index 22-39 is mono FM simulating mode; spectrum mode index 1,3,5,7,10,14,15,18,22,24,25,26,29,30,32,33,38
  • the remaining indexes are Class A spectrum modes
  • the correspondence between the spectrum mode indexes 01-39 and the occupied subbands is as follows:
  • the system information includes 4 bits for indicating the current subband nominal frequency point position, and the subband nominal frequency point position is 50KHz as the frequency step.
  • the method and apparatus of the present invention can efficiently and quickly identify the spectrum combination mode in the current digital audio broadcast signal, and realize the need for high-capacity multi-service data reception under digital audio broadcasting.
  • FIG. 1 is a schematic diagram of a baseband spectrum of a digital audio broadcast signal according to an embodiment of the present invention
  • FIG. 2 is a spectrum diagram of a digital audio broadcast signal according to an embodiment of the present invention
  • FIG. 3 is a block diagram of processing of data information at a transmitting end according to an embodiment of the present invention.
  • FIG. 4 is a schematic diagram of a convolutional code encoder according to an embodiment of the present invention.
  • FIG. 5 is a schematic diagram of constellation mapping according to an embodiment of the present invention.
  • FIG. 6 is a flow chart of a frequency synchronization and reception method according to an embodiment of the present invention.
  • FIG. 7 is a block diagram of processing of data information at a receiving end according to an embodiment of the present invention.
  • FIG. 8 is a structural diagram of a sub-frame of a digital audio broadcast signal according to an embodiment of the present invention.
  • FIG. 9 is a schematic diagram of transmission and reception of a spectrum template index 3 according to an embodiment of the present invention.
  • a digital audio broadcasting system is based on Orthogonal Frequency Division Multiplexing (OFDM) And a multi-spectral mode digital audio broadcasting system.
  • OFDM Orthogonal Frequency Division Multiplexing
  • FIG. 1 shows a schematic diagram of a baseband spectrum of a digital audio broadcast signal, where the 0 frequency point corresponds to the signal center frequency point, that is, the position of the OFDM symbol subcarrier 0.
  • the digital audio broadcasting subband has a nominal bandwidth of 100 kHz, and the digital audio broadcasting signal in the subband is a digital audio broadcasting signal in the ⁇ band, which is a division of the spectrum of the digital audio broadcasting signal.
  • the digital audio broadcast signal consists of up to 8 subbands with a nominal bandwidth of 100 kHz.
  • the digital audio broadcast signal includes two types of spectrum modes, namely, a class A spectrum mode and a class B spectrum mode.
  • the class A spectrum mode includes 8 sub-bands, and the sub-band nominal frequency points are ⁇ 10 ⁇ 50 ) ⁇ , ⁇ 0 , 1 , 2 , 3 ;
  • the present invention includes a total of 39 spectral modes, and Figure 2 defines the spectral modes and corresponding spectral mode indices that are allowed for use with digital audio broadcast signals.
  • the spectrum mode specifies the number of subbands in a digital audio broadcast signal, and the bandwidth of each spectrum in the spectrum mode is 50 kHz.
  • the white block indicates the spectrum that is not occupied
  • the shaded block indicates the lower half of the effective subband
  • the light gray indicates the frequency band occupied by the analog station.
  • the spectrum mode index 1-8 is a pure digital mode
  • the spectrum mode index 9-21 is a stereo frequency simulcast mode
  • the spectrum mode index 22-39 is a mono frequency simulcast mode
  • the spectrum mode index 1, 3, 5, 7 , 10, 14, 15, 18, 22, 24, 25, 26, 29, 30, 32, 33, 38 are Class B spectral modes
  • the remaining indexes are Class A spectral modes.
  • the correspondence between the spectrum mode index 1-39 and the occupied subband is as follows:
  • system information including a spectrum mode index and current subband nominal frequency point information is formed at the transmitting end;
  • the information is subjected to channel coding, bit interleaving, and symbol mapping, and is combined with service data, service description information, and discrete pilots processed by scrambling, encoding, interleaving, etc. to form a digital audio broadcast signal for transmission.
  • the system information includes at least 36 bits, and the meaning of each bit is as shown in Table 1.
  • the sub-band nominal frequency point position of the current sub-band is defined by 4 bits ⁇
  • the sub-band nominal frequency point position is 50KHz as the frequency step
  • Table 2 gives the corresponding relationship
  • the system information Use 6 bits ⁇ to define the spectrum mode index
  • Table 3 gives the corresponding relationship.
  • the channel coding uses a 1/4 convolutional code with a constraint length of 7.
  • the encoder of the convolutional code is shown in Figure 4.
  • the corresponding octal generator polynomial is: 133, 171, 145, 133.
  • the initial value of the shift register is full. "0".
  • the convolutional coding is performed independently for every 36 system information shown in Table 1.
  • the lower bits of the system information bit stream are first, that is, b0 is first.
  • the convolutionally encoded system information is bit interleaved, and the interleaving is performed in units of interleaved blocks.
  • the interleaving algorithm is as follows: For the input sequence before interleaving, z ⁇ ' 21 ' ⁇ '''' ⁇ -- 1 ), where N ⁇ The length of the interleaved block is 144, and the output sequence after interleaving is:
  • the system information is fixed by QPSK mapping.
  • the mapping mode is shown in Figure 5.
  • the bit stream 7 after bit interleaving. , ⁇ ... maps to QPSK symbol stream transmission, and various symbol maps add power normalization factors to make the average power of various symbol maps convergent.
  • the frequency synchronization and receiving method of the digital audio broadcasting signal includes the following steps: (1) The receiver adjusts the front end to set the frequency point, and demodulates the number in one subband.
  • the audio broadcast signal includes the following steps: (1) The receiver adjusts the front end to set the frequency point, and demodulates the number in one subband.
  • the audio broadcast signal includes the following steps: (1) The receiver adjusts the front end to set the frequency point, and demodulates the number in one subband.
  • the audio broadcast signal (2) extracting the current subband nominal frequency point information included in the system information and the spectrum mode index information used by the current digital audio broadcast signal; (3) according to the extracted current subband nominal frequency point information And the spectrum mode index information used by the current digital audio broadcast signal, adjusting the front-end frequency point setting of the receiver, and completing the frequency center point synchronization in the current digital audio broadcast signal spectrum mode.
  • the method further comprises the following steps after completing the frequency center point synchronization in the current digital audio broadcast signal spectrum mode: (4) For all valid subbands in the current spectrum mode According to the reception and demodulation.
  • the device includes: a system information processing module 410, configured to deinterleave and decode system information in a digital audio broadcast signal in a subband and extract current subband nominal frequency point information and current digital audio broadcast signal Spectrum mode index information.
  • the frequency point and filter setting module 401 is configured to adjust the front end frequency point setting of the receiver according to the extracted current subband nominal frequency point information and the spectrum mode index information used by the current digital audio broadcast signal, and complete the current digital audio broadcasting. Frequency center point synchronization in signal spectrum mode.
  • the frequency point and filter setting module 401 is further configured to perform an effective subband center frequency point setting according to a frequency step of 50 KHz after receiving the system reset, and obtain a current center frequency point by using a filter corresponding thereto. A valid signal within a subband bandwidth.
  • the apparatus further includes a timing and carrier frequency offset estimation module 402 that performs timing and carrier frequency offset estimation on the current subband signal according to the beacon signal in the subframe structure of the digital audio broadcasting system shown in FIG.
  • the channel estimation and equalization module 403 is configured to perform channel estimation and data equalization after acquiring timing and carrier frequency offset estimation.
  • the data information symbol extraction module 407 is configured to perform effective data symbol extraction on the signal after channel estimation and data equalization.
  • the deinterleaving module 408 and the decoding module 409 are configured to obtain data bit information carried by the digital broadcast.
  • the system information processing module 410 further includes: a system information symbol extraction module 404, configured to extract data symbols that carry the spectrum template index and the current subband nominal frequency point information after the data is equalized.
  • the deinterleaving and convolutional decoding module 405 is configured to deinterleave and decode the bearer spectrum template index and the current subband nominal frequency point information data symbol to obtain bit information carried by the continuous pilot subcarrier.
  • the spectrum template and the subband nominal frequency point information module 406 are configured to obtain the spectrum template index of the current received signal and the current subband nominal frequency point information according to the correspondence between the tables 1-3, and send the frequency point information to the frequency point and Filter setting module 401.
  • FIG. 9 shows a schematic diagram of a receiving process in the spectrum combining mode with the spectrum template index 3.
  • the center frequency of the receiver is set at the center of the sub-band 1, as shown in Fig. 6 (b), and the effective signal of the sub-band 1 is obtained by the corresponding low-pass filter.
  • the spectrum template index carried in the subband 1 and the current subband nominal frequency point information are extracted.
  • the frequency point and the filter setting module are adjusted to the center position of the current spectrum template index 3, that is, the center position of the sub-band 2, and then the data carried in the three sub-bands under the spectrum template index is demodulated.
  • the method and apparatus of the present invention can efficiently and quickly identify the spectrum combination mode in the current digital audio broadcast signal, and realize the need for high-capacity multi-service data reception under digital audio broadcasting.
  • each functional unit in each embodiment of the present invention may be integrated into one processing module, or each unit may exist physically separately, or two or more units may be integrated into one module.
  • the above integrated modules can be implemented in the form of hardware or in the form of software functional modules.
  • the integrated modules, if implemented in the form of software functional modules and sold or used as stand-alone products, may also be stored in a computer readable storage medium.
  • the above-mentioned storage medium may be a read only memory, a magnetic disk or an optical disk or the like.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Circuits Of Receivers In General (AREA)

Abstract

La présente invention porte sur un procédé de synchronisation de fréquences et de réception de signal de diffusion audio numérique, le procédé comprenant les opérations suivantes : un récepteur régule un point de fréquence de réglage de frontal, et démodule des signaux de diffusion audio numérique présents dans une sous-bande ; et extrait des informations de point de fréquence nominale d'une sous-bande courante et des informations d'indice de mode spectral d'un signal de diffusion audio numérique courant d'informations système ; et ajuste un réglage de point de fréquence de frontal de récepteur conformément aux informations de fréquence nominale extraites de la sous-bande courante et aux informations d'indice de mode spectral du signal de diffusion audio numérique courant, et achève la synchronisation de fréquences centrales sous le mode spectral du signal de diffusion audio numérique courant. La présente invention porte également sur un appareil de synchronisation de fréquences et de réception d'un signal de diffusion audio numérique. L'utilisation du procédé et de l'appareil permet de reconnaître efficacement et rapidement le mode de combinaison spectrale d'un signal de diffusion audio numérique courant afin de répondre au besoin de forte capacité et de réception de données de multiples services de la diffusion audio numérique.
PCT/CN2012/080170 2011-08-17 2012-08-15 Procédé et appareil de synchronisation de fréquences et de réception de signal de diffusion audio numérique Ceased WO2013023595A1 (fr)

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CN201110240284.8A CN102957651B (zh) 2011-08-17 2011-08-17 一种数字音频广播信号频率同步和接收方法及其装置
CN201110240284.8 2011-08-17

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CN105656580B (zh) * 2015-12-31 2018-10-30 南阳理工学院 基于drm+的数字功率动态接入方法

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CN1938975A (zh) * 2004-04-07 2007-03-28 三星电子株式会社 在宽带无线通信系统中在自适应调制编码模式和分集模式之间转换的设备和方法
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