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WO2016163732A1 - Procédé et appareil d'émission et de réception de signal de référence basé sur le préambule - Google Patents

Procédé et appareil d'émission et de réception de signal de référence basé sur le préambule Download PDF

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Publication number
WO2016163732A1
WO2016163732A1 PCT/KR2016/003566 KR2016003566W WO2016163732A1 WO 2016163732 A1 WO2016163732 A1 WO 2016163732A1 KR 2016003566 W KR2016003566 W KR 2016003566W WO 2016163732 A1 WO2016163732 A1 WO 2016163732A1
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Prior art keywords
preamble sequence
auxiliary
main
reference signal
predefined
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English (en)
Inventor
Pengfei Sun
Bin Yu
Dalin Zhu
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Samsung Electronics Co Ltd
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Samsung Electronics Co Ltd
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Priority claimed from CN201510163486.5A external-priority patent/CN106161316B/zh
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Priority to US15/562,379 priority Critical patent/US10594453B2/en
Publication of WO2016163732A1 publication Critical patent/WO2016163732A1/fr
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0058—Allocation criteria
    • H04L5/006—Quality of the received signal, e.g. BER, SNR, water filling
    • 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
    • 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
    • H04L27/2602—Signal structure
    • H04L27/261—Details of reference signals
    • H04L27/2613—Structure of the reference signals
    • 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
    • H04L27/2626—Arrangements specific to the transmitter only
    • H04L27/2627—Modulators
    • H04L27/264—Pulse-shaped multi-carrier, i.e. not using rectangular window
    • H04L27/26416—Filtering per subcarrier, e.g. filterbank multicarrier [FBMC]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0003—Two-dimensional division
    • H04L5/0005—Time-frequency
    • H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A) or DMT

Definitions

  • the present application relates to wireless communication, and particularly to methods and apparatuses for transmitting and receiving a preamble based reference signal based on a filter-bank multi-carrier modulation.
  • the 5G or pre-5G communication system is also called a ‘Beyond 4G Network’ or a ‘Post LTE System’.
  • the 5G communication system is considered to be implemented in higher frequency (mmWave) bands, e.g., 60GHz bands, so as to accomplish higher data rates.
  • mmWave e.g., 60GHz bands
  • MIMO massive multiple-input multiple-output
  • FD-MIMO Full Dimensional MIMO
  • array antenna an analog beam forming, large scale antenna techniques are discussed in 5G communication systems.
  • RANs Cloud Radio Access Networks
  • D2D device-to-device
  • wireless backhaul moving network
  • cooperative communication Coordinated Multi-Points (CoMP), reception-end interference cancellation and the like.
  • CoMP Coordinated Multi-Points
  • Hybrid FSK and QAM Modulation FQAM
  • SWSC sliding window superposition coding
  • ACM advanced coding modulation
  • FBMC filter bank multi carrier
  • NOMA non-orthogonal multiple access
  • SCMA sparse code multiple access
  • IMT.VISION in which demand prospects, application scenarios and a variety of key performance indicators are described in detail.
  • the report of ITU-R M.[IMT.FUTURE TECHNOLOGY TRENDS] provides relevant information on developing trends and the like of 5G, intending to solve challenging problems, such as sharp increase of the system throughput, consistency of user experience, scalability to support IoT, ultra-low latency, high energy efficiency and high cost efficiency communications, highly flexible networks, support of new services, flexible spectrum usage and the like.
  • Modulation waveforms and multiple access schemes are fundamentals in designing Air-Interface of mobile communications, including 5G.
  • OFDM Orthogonal Frequency Division Multiplexing
  • MCM Multi-Carrier Modulation
  • E-UTRA Evolved Universal Terrestrial Radio Access
  • 3GPP Third Generation Partnership Project
  • LTE Long Term Evolution
  • DVD Digital Video Broadcasting
  • DVB Digital Audio Broadcasting
  • VDSL Very-high-bit-rate Digital Subscriber Loop
  • OFDM Inverse Fast Fourier Transform/Fast Fourier Transform
  • IFFT/FFT Inverse Fast Fourier Transform/Fast Fourier Transform
  • CP Cyclic Prefix
  • OFDM adopts Rectangular Pulse which results in severe out-of-band leakage since this type of time domain waveform makes the side-lopes of its corresponding frequency domain counterpart roll off very slowly. Therefore, OFDM is very sensitive to the Carrier Frequency Offset (CFO).
  • CFO Carrier Frequency Offset
  • FBMC Filter Bank Multi-Carrier
  • the FBMC system generally employs Offset Quadrature Amplitude Modulation (OQAM) to maximize the spectrum efficiency. Therefore, such technology is generally named FBMC/OQAM system, or OFDM/OQAM system.
  • OFDM/OQAM system Offset Quadrature Amplitude Modulation
  • the applications of FBMC in digital communications have been discussed in an early article entitled “Analysis and Design of OFDM/OQAM Systems Based on Filter Bank Theory” (IEEE Transactions on Signal Processing, vol.50, no.5, pp.1170-1183, May 2002).
  • FBMC has some advantageous characteristics which OFDM does not possess
  • FBMC attracts more and more attention in 5G research, but some of its inherent shortcomings challenge its applications in future mobile communication systems, and these challenges need to be solved and are being studied constantly.
  • One of the most significant problems is that, in order to obtain the maximum spectrum efficiency, a system using FBMC must use a FBMC/OQAM or OFDM/OQAM modulation.
  • the carriers are only orthogonal in the real field instead of a pure orthogonal relationship, which means that the reference signal will be interfered by symbols from adjacent carrier. Such interference may not be eliminated effectively prior to equalization operation at the receiving end.
  • the interference challenges the design of the reference signal, since that, without a special design, the reference signal will suffer from strong interference which may result in significant reduction of performance of channel estimation of the receiving end so that the signal may not be effectively equalized, and leading to high bit error rate.
  • the reference signals for the applications must be designed appropriately, which is a key point as to whether FBMC system can be widely used in 5G.
  • the present invention aims to design a preamble based reference signal for the filter-bank multi-carrier modulation technology, for example, OFDM/OQAM or Filtered Multi-tone.
  • the preamble based reference signal is able to utilize the self-interference of OFDM/OQAM or FMT effectively so that the receiver may make an efficient channel estimation.
  • the design may also be compatible with some technologies that are widely used in OFDM systems, which make it well applied in a multi-user, multi-cell communication system.
  • a method for transmitting a preamble based reference signal comprises: generating a main preamble sequence; generating an auxiliary preamble sequence, wherein, on a predefined resource, a synthesized signal of the main preamble sequence and the auxiliary preamble sequence is equal to a predefined preamble based reference signal; and transmitting the main preamble sequence and the auxiliary preamble sequence based on a filter-bank multi-carrier modulation.
  • the synthesized signal on the predefined resource is synthesized by the main preamble sequence, an interference generated by the main preamble sequence, an interference generated by the auxiliary preamble sequence and an interference generated by a data signal, and wherein the predefined resource is a resource where the main preamble sequence is transmitted.
  • the generating the auxiliary preamble sequence comprises: calculating the auxiliary preamble sequence, so that a sum of the main preamble sequence, the interference generated by the main preamble sequence, the interference generated by the auxiliary preamble sequence and the interference generated by the data signal is, on the predefined resource, equal to the predefined preamble based reference signal.
  • the auxiliary preamble sequence is structurally symmetrical or asymmetrical to the main preamble sequence.
  • the transmitting the auxiliary preamble sequence comprising: transmitting the auxiliary preamble sequence alone on an allocated resource; or transmitting the auxiliary preamble sequence superimposed with the data signal on the allocated resource.
  • the interferences are interferences between different subcarriers based on the filter-bank multi-carrier modulation.
  • the generating the main preamble sequence comprises: extracting a real part or an imagery part from the predefined preamble based reference signal to generate the main preamble sequence.
  • the transmitting the main preamble sequence and the auxiliary preamble sequence comprises: transmitting the main preamble sequence and the auxiliary preamble sequence on a plurality of continuous subcarrier resources.
  • the transmitting the main preamble sequence and the auxiliary preamble sequence comprises: transmitting the main preamble sequence and the auxiliary preamble sequence at different antenna ports, wherein the predefined preamble based reference signals used at the different antenna ports are orthogonal or quasi-orthogonal to each other.
  • a method for receiving a preamble based reference signal comprises: receiving the preamble based reference signal on a predefined resource, wherein the preamble based reference signal is constructed by a main preamble sequence, an interference generated by the main preamble sequence, an interference generated by an auxiliary preamble sequence and an interference generated by a data signal, and wherein the predefined resource is a resource where the main preamble sequence is transmitted; and estimating a channel according to the received preamble based reference signal and a predefined preamble based reference signal.
  • the method further comprises: receiving signals on a resource where the auxiliary preamble sequence is transmitted, and combining the received signals to recover the data signal.
  • a transmitter comprising: a processor configured to generate a main preamble sequence and an auxiliary preamble sequence, wherein, on a predefined resource, a synthesized signal of the main preamble sequence and the auxiliary preamble sequence is equal to a predefined preamble based reference signal; and an antenna configured to transmit the main preamble sequence and the auxiliary preamble sequence based on a filter-bank multi-carrier modulation.
  • a receiver comprising: an antenna configured to receive a preamble based reference signal on a predefined resource, wherein the preamble based reference signal is constructed by a main preamble sequence, an interference generated by the main preamble sequence, an interference generated by an auxiliary preamble sequence and an interference generated by a data signal, and wherein the predefined resource is a resource where the main preamble sequence is transmitted; and a processor configured to estimate a channel according to the received preamble based reference signal and a predefined preamble based reference signal.
  • the embodiments of the application design the main preamble sequence and the auxiliary preamble sequence appropriately so that the synthesized signal on the predefined resource is equal to the predefined preamble based reference signal.
  • the predefined reference signal may be obtained at the receiving end by using the intrinsic interference of FBMC modulation, thereby making an efficient channel estimation.
  • the FBMC system may have better robustness and wide range of application.
  • Fig. 1 illustrates a schematic diagram of generating conventional FBMC/OQAM signals
  • Fig. 2 illustrates a diagram of two types of reference signal structure
  • Fig. 3 illustrates an exemplary flow chart of a method for transmitting a reference signal in accordance with an embodiment of the present application
  • Fig. 4 illustrates a schematic diagram of the structure of a main preamble sequence and an auxiliary preamble sequence in accordance with Embodiment 1 of the present application;
  • Fig. 5 illustrates a schematic flow chart of a method for generating a main preamble sequence and an auxiliary preamble sequence in accordance with an embodiment of the present application
  • Fig. 6 illustrates a schematic diagram of interferences between subcarriers in OQAM modulation
  • Fig. 7 illustrates a schematic diagram of the structure of a main preamble sequence and an auxiliary preamble sequence in accordance with Embodiment 2 of the present application;
  • Fig. 8 illustrates a schematic diagram of the structure of a main preamble sequence and an auxiliary preamble sequence in accordance with Embodiment 3 of the present application;
  • Fig. 9 illustrates a schematic flow chart of a method for calculating an auxiliary preamble sequence using a data loading mode in accordance with Embodiment 3 of the present application.
  • Fig. 10 illustrates a simplified block diagram of an entity which is suitable for implementing the exemplary embodiments of the present application.
  • a signal waveform having good time/frequency localization can be obtained by Filter Bank Multi-Carrier (FBMC) modulation, in which the corresponding prototype filter banks can be designed based on isotropic orthogonal transform algorithm (IOTA), extended Gaussian function (EGF) and European PHYDYAS and so on.
  • IOTA isotropic orthogonal transform algorithm
  • EMF extended Gaussian function
  • EPHYDYAS European PHYDYAS
  • the FBMC system employs prototype filter banks with good TFL properties to pulse-shape the signals on each sub-carrier such that: 1) the FBMC can greatly suppress the ISI resulted from multipath fading channel without the insertion of CP, which not only results in higher spectrum efficiency and energy efficiency compared with OFDM, but also exhibits robust and reliable receiving performance under relatively large timing synchronization errors, which in turn allows asynchronous transmissions and receptions; and 2) with good Time/Frequency Localization property, the FBMC can transmit signals in extremely narrow frequency band and keep a very low out-of-band leakage which reduces the inter-carrier interference (ICI) resulted from Doppler spread and the phase noise. Therefore, the FBMC has great potential in cognitive radios, fragmented spectrum access and asynchronous transmission and the like.
  • ICI inter-carrier interference
  • the Offset Quadrature Amplitude Modulation (OQAM) is generally employed, which is referred to as FBMC/OQAM or OFDM/OQAM (OQAM is used hereafter in short).
  • Other FBMC modulations of low rates comprise Filtered Multitone (FMT), Filtered OFDM and so on.
  • FMT Filtered Multitone
  • the OQAM is employed as a typical example to describe the transmission and reception of signals based on a filter-bank multi-carrier modulation.
  • one QAM symbol is divided into two signals, and these two signals are modulated onto the real or imaginary parts of a sub-carrier respectively, and they are transmitted alternately with a time offset.
  • the transmitted signal can be recovered by extracting alternately the real or imaginary parts of the signal on each sub-carrier.
  • Fig. 1 illustrates a schematic diagram of generating and transmitting conventional FBMC/OQAM signals.
  • M parallel data are obtained after an inputted complex modulated data, such as a complex QAM (Quadrature Amplitude Modulation) symbol, is serial-to-parallel converted by a serial/parallel converter unit 101, where M is the number of the sub-carriers.
  • Each signal is divided into two signals, and the real and imaginary parts of these two signals are extracted by a real part extracting unit 102 and an imaginary part extracting unit 103, respectively.
  • the real part and the imaginary part of the signals are modulated respectively via an inverse fast Fourier transform unit 104.
  • the modulated signals are transmitted to a synthesis filter bank unit 105 to perform the pulse-shaping.
  • the real part and the imaginary part of the signals are combined, and the combined signals are inputted into a parallel/serial converter unit 106, which in turn outputs the OQAM signal.
  • each module or unit shown in Fig. 1 can be easily understood from the mathematical signal modeling of the OQAM signal.
  • the equivalent form of the base band of the continuous-time multi-carrier FBMC/OQAM signal can be formulated as:
  • a frequency-time point represents a real modulated signal on the m-th sub-carrier of the n-th symbol, that is, a pulse amplitude modulation (PAM) symbol
  • PAM pulse amplitude modulation
  • the symbol rate of the OQAM is two times of the symbol rate of the traditional OFDM without cyclic prefix (CP). Because the OQAM modulation is based on real numbers, the information amount of each OQAM symbol is half of that of the traditional OFDM. That is to say, the signal rate of an OQAM system is the same as that of an OFDM system without CP.
  • the real field orthogonality of the OQAM is achieved by designing prototype filter function .
  • the inner product of the synthesis filter function at the transmitting end and the analysis filter function at the receiving end needs to meet or approximately meet equation (2), that is, the prototype filter needs to meet:
  • the perfect reconstruction (PR) of the original transmitted real signal can be achieved by simply processing the received signal according to equation (3) via the receiving analysis filter (AF) which corresponds to the transmitting synthesis filter (SF) , where is noisy term, then the original data can be modulated by synthesizing the complex QAM signal .
  • AF receiving analysis filter
  • SF transmitting synthesis filter
  • the structures of the reference signal may be catalogued into a discrete reference signal (Scattered Pilot) structure and a continuous preamble based reference signal (Preamble) structure.
  • a system may select a preferred reference signal structure based on different purposes. For example, in a LTE system, the downlink adopts the scattered pilot based reference signal structure, while an uplink adopts the preamble based reference signal structure due to a different modulation scheme is utilized.
  • Fig. 2 illustrates two types of reference signal structure.
  • the left drawing illustrates a structure of a scattered pilot based reference signal with the reference signal distributed on scattered subcarriers
  • the right drawing illustrates a structure of a preamble based reference signal with the reference signal distributed on continuous subcarriers.
  • the preamble based reference signal referred to in the embodiments of the present application is a preamble sequence constituted on a plurality of continuous subcarriers, which is similar to those used in a LTE uplink, unless otherwise stated.
  • Fig. 3 illustrates an exemplary flow 300 of a method for transmitting a reference signal in accordance with an embodiment of the present application
  • step 301 a main preamble sequence is generated.
  • step 302 an auxiliary preamble sequence is generated.
  • a synthesized signal of the main preamble sequence and the auxiliary preamble sequence on a predefined resource is equal to a predefined preamble based reference signal.
  • step 303 the main preamble sequence and the auxiliary preamble sequence are transmitted based on a filter-bank multi-carrier modulation.
  • the synthesized signal on the predefined resource is synthesized by the main preamble sequence, an interference generated by the main preamble sequence, an interference generated by the auxiliary preamble sequence and an interference generated by a data signal, and the predefined resource is a resource where the main preamble sequence is transmitted.
  • the main preamble sequence and the auxiliary preamble sequence are designed appropriately so that the synthesized signal on the predefined resource is the same as the predefined preamble based reference signal.
  • the predefined reference signal may be obtained at the receiving end by using the intrinsic interference of the FBMC modulation (for example, OQAM), and thus makes an efficient channel estimation.
  • the FBMC system may have better robustness and wide range of application.
  • auxiliary preamble sequence may be designed.
  • the methods for transmitting and receiving a reference signal in accordance with embodiments of the present application will be described in connection with particular embodiments.
  • a particular design of a reference signal structure is provided, and the design method may also be applied to other reference signal structures.
  • Fig. 4 illustrates an exemplary structure of a reference signal in accordance with the Embodiment 1 of the present application.
  • Fig. 4 a schematic diagram illustrating a main preamble sequence, an auxiliary preamble sequence and data signal multiplexed in a data block.
  • the auxiliary preamble sequence is structurally asymmetric to the main preamble sequence.
  • a conventional ZC (Zadoff-Chu) sequence is used as a predefined preamble based reference signal, i.e., a target reference signal or a target preamble sequence.
  • the ZC sequence has a variety of unique characteristics, for example, good autocorrelation and cross-correlation characteristics, low PAPR (Peak to Average Power Ratio), etc. These features enable the ZC sequence to be widely used in the design of reference signals in wireless communication systems, such as a demodulation reference signal in LTE.
  • a generation method of the ZC sequence may be expressed by the following Equation (4):
  • root index is any integer.
  • the root index is omitted, and is defined as a target preamble sequence and is set.
  • ZC sequence is used herein only as an example, other complex reference signals may also be used in the present invention.
  • Fig. 5 illustrates a schematic flow chart of a method for generating a main preamble sequence and an auxiliary preamble sequence in accordance with Embodiment 1 of the present application.
  • the method for generating the preamble sequence structure shown in Fig. 4 will now be described with reference to Fig. 5.
  • Step 501 a main preamble sequence is generated.
  • symbols of OQAM modulation may only be real PAM signals and be alternately modulated onto a real constellation point or an imaginary constellation point. Therefore, real or imaginary parts are extracted from a predefined reference signal to generate the main preamble sequence in one implementation. For example, the generation of the main preamble sequence in PAM form may be achieved through extracting the real or imaginary parts of a ZC sequence.
  • the modulated signal transmitted by the main preamble sequence is:
  • Step 502 interference suffered by the main preamble sequence is calculated.
  • OQAM modulation only has real field orthogonality.
  • the transmitted imaginary-real-alternate signals will also be subject to real-imaginary-alternate interferences at the receiving end, even in a distortion-free channel. These interferences come from signals on an adjacent carrier. For example, assuming one of the real signals modulated on the (m,n)th subcarrier at the transmitting end is , will be received on the (m,n)th subcarrier at the receiving end (assuming the channel is lossless), where:
  • m',n' are indexes for subcarriers adjacent to the (m,n)th subcarrier; is a symbol on the (m',n')th subcarrier; is an interference factor of the (m',n')th carrier to the (m,n)th carrier in the OQAM modulation.
  • the interference factor is determined by parameters of the applied prototype filter, and may be obtained by calculation or simulation.
  • D is a set of indices of all carriers that may cause interference to the (m,n)th carrier.
  • Fig. 6 illustrates a diagram of the interferences between subcarriers in the OQAM modulation, i.e., a schematic diagram of the above-mentioned interference condition.
  • the set D has a total of 8 adjacent carriers causing interference to .
  • the self-interference suffered by the main preamble sequence and the interference due to a data signal are calculated in step 502. It should be noted that, at this point, the interference caused by the auxiliary preamble sequence is not calculated, and is assumed to be zero. Assuming the main preamble sequence is the n-th OQAM symbol in a data block, when m is an even number:
  • step 503 the residual interference desired for obtaining a complex ZC sequence is calculated.
  • the originally modulated main preamble sequence on each subcarrier includes only real numbers or imaginary numbers .
  • the modulated signal on each subcarrier becomes a complex signal due to inter-carrier interference.
  • the desired target ZC sequence may be reconstructed on the carrier resource of the main preamble sequence by constructing interference on the subcarriers where the main preamble sequence is located. Since part of the interference already exists, only the desired residual interference needs to be calculated:
  • Step 504 an auxiliary preamble sequence is calculated.
  • the desired residual interference may be calculated based on Equation (10).
  • Embodiment 1 is generated through an auxiliary preamble sequence as shown in Fig. 4. is an auxiliary preamble sequence vector, and interference thereof generated on the main preamble sequence may be expressed as:
  • the synthesized complex sequence generated on the subcarrier where the main preamble sequence is located is equal to , when the values of the auxiliary preamble sequence satisfies Equation (12).
  • a ZC sequence influenced by the channel may be obtained at the receiving end, on the resource where the main preamble sequence is transmitted.
  • the channel may be estimated at the receiving end according to a predefined ZC sequence, for example, , where is a complex OQAM signal received on the (m,n)th carrier.
  • the method of generating a complex ZC sequence is provided through four steps as shown in Fig. 5. Although the values of the main preamble sequence and the auxiliary preamble sequence are still taken based on the real PAM, a complex ZC sequence may be obtained at the receiving end as the reference signal utilizes the intrinsic interference of the OQAM modulation. Thus, the design method is not conditioned by the real-imaginary-alternate modulation of OQAM, and may be applied to designs of any traditional reference signal.
  • some principles for designing the reference signal such as using ZC sequence with cyclic extension, utilizing diffident root indices for diffident cells, using cyclic shift to produce a plurality of orthogonal sequences or the like may be perfectly transplanted to the OQAM system.
  • auxiliary preamble sequence is provided, wherein the auxiliary preamble sequence is structurally symmetrical to the main preamble sequence.
  • Embodiment 1 the calculation of the auxiliary preamble sequence needs a matrix operation (Equation (12)).
  • the inverse operation of a matrix may be operated offline.
  • the operation of matrix multiplication still has a certain degree of complexity.
  • a new preamble sequence structure is provided to reduce the complexity.
  • Fig. 7 schematically illustrates a diagram of the structure of the main preamble sequence and the auxiliary preamble sequence in accordance with Embodiment 2 of the present application.
  • the auxiliary preamble sequence is structurally symmetrical to the main preamble sequence.
  • the auxiliary preamble sequences are arranged on both sides of the main preamble sequence in this structure.
  • two groups of auxiliary preamble sequences may have the same value, , and produce the desired interference together.
  • a pair of symmetrical preamble sequences generates non-zero interference at the subcarrier therebetween, and the interference at other subcarriers on the main preamble sequence’s resource is zero. That is, for the auxiliary preamble symbol pair , if the interference on caused by them is defined as , then
  • the calculation of the auxiliary preamble sequence may also be carried out by the method described in Embodiment 1. Specifically, first, the desired interference is calculated by step 501 to step 503 as shown in Fig. 5 in accordance with Embodiment 1. Secondly, is set if m is an even number; and is set if m is an odd number, and then the following may be calculated:
  • Equation (14) the value of the auxiliary preamble sequence on each subcarrier may be obtained through a simple division operation according to the desired interference on the carrier. Compared to Equation (12) in Embodiment 1, the complexity of Equation (14) is significantly reduced. Thus, the method of the symmetrical auxiliary preamble sequence in the present embodiment may be implemented quickly.
  • auxiliary preamble sequence identical to that of Embodiment 2 is provided, except that the auxiliary preamble sequence is transmitted together with the data signal on the same resource.
  • the symmetrical structure of the auxiliary preamble sequence may allow to generate simple auxiliary preamble sequence.
  • the structure as shown in Fig. 7 includes two columns of the auxiliary preamble sequences.
  • the symmetrical preamble sequence structure requires more subcarrier resources to be used to generate the main preamble sequence. It is obvious that the consumption of more subcarrier resources means lower spectrum efficiency.
  • an improved method is provided which may reduce the consumption of resources caused by the auxiliary preamble sequence through a data loading method, thereby improving the spectrum utilization efficiency.
  • Fig. 8 schematically shows a schematic structure diagram of the main preamble sequence and the auxiliary preamble sequence in accordance with Embodiment 3 of the present application.
  • two columns of the auxiliary preamble sequences have the same value: Therefore, it may be considered that the two columns of the auxiliary preamble sequences use a cover code of a [++] type.
  • one column of data signals may be superimposed on the auxiliary preamble sequences using an orthogonal cover code.
  • the data signals may use a cover code of a [+-] type, i.e., .
  • the receiver may recover the data signals by only combining the signals on the resource where the auxiliary preamble sequence is transmitted:
  • the method of calculating the auxiliary preamble sequence in this embodiment is slightly different from that when no data is loaded. Specifically, when the interference suffered by the main preamble sequence due to data signals is calculated in step 502 in Fig. 5, the superimposed data signals should also be taken into account, and then the value of the auxiliary preamble sequence is calculated.
  • the flow chart of the method is illustrated in Fig. 9.
  • Fig. 9 illustrates an exemplary flow chart of the method of calculating the auxiliary preamble sequence by the way of data loading in accordance with Embodiment 3 of the present application.
  • Step 901 a main preamble sequence is generated.
  • the generation of the main preamble sequence is the same as that of step 501 as shown in Fig. 5. For example, first, a target complex preamble sequence is generated, and then the real or imaginary part of the target complex preamble sequence is extracted as the main preamble sequence.
  • Step 902 interference suffered by the main preamble sequence is calculated.
  • calculating interference suffered by the main preamble sequence comprises calculating self-interference of the main preamble sequence and interference caused by a data signal.
  • Step 903 interference caused by the data superimposed on the auxiliary preamble sequence is calculated.
  • the interference generated by the superimposed data signals may be calculated according to the relevant description of step 502 of Fig. 5, and the redundant description thereof is omitted here.
  • Step 904 residual interference desired for obtaining the target complex preamble sequence is calculated.
  • Step 905 the auxiliary preamble sequence is calculated according to the desired residual interference.
  • Steps 904, 905 are the same as steps 503, 504, and will not be repeated herein.
  • auxiliary preamble sequence in Embodiment 1 may also be superimposed with the data signal so as to reduce resource consumption due to the auxiliary preamble sequence and improve the spectrum utilization efficiency.
  • both of the main preamble sequence and the auxiliary preamble sequence may be transmitted at diffident antenna ports, and the predefined reference signal sequences used on the different antenna ports are orthogonal or quasi-orthogonal to each other.
  • a main preamble sequence 1 and an auxiliary preamble sequence 1 are transmitted on a first antenna port, and the synthesized signal thereof is a reference signal sequence 1 used by the first antenna port;
  • a main preamble sequence 2 and an auxiliary preamble sequence 2 are transmitted on a second antenna port, and the synthesized signal thereof is a reference signal sequence 2 used by the second antenna port; and the reference signal sequence 1 and the reference signal sequence 2 may be orthogonal or quasi-orthogonal to each other.
  • a method for receiving a preamble based reference signal is also provided in the embodiments of the present application.
  • the intrinsic interference of OQAM modulation is taken into account in the design of the preamble based reference signal in accordance with the present application. Therefore, the predefined preamble based reference signal may be obtained at the receiving end utilizing the intrinsic interference of OQAM modulation directly without any interference elimination so as to perform the effective channel estimation.
  • the method for receiving a preamble based reference signal comprises receiving a preamble based reference signal on a predefined resource.
  • the preamble based reference signal is constructed by a main preamble sequence, an interference generated by the main preamble sequence, an interference generated by an auxiliary preamble sequence and an interference generated by a data signal
  • the predefined resource is a resource on which the main preamble sequence is transmitted. Subsequently, a channel estimation may be performed at the receiving end according to the received preamble based reference signal and the predefined preamble based reference signal.
  • the method may further comprises receiving signal on a resource where the auxiliary preamble sequence is transmitted and combining the received signals to recover the data signal.
  • Fig. 10 illustrates a simplified block diagram of an entity 1000 which is suitable for implementing the exemplary embodiments of the present application.
  • the entity 1000 may be configured as a transmitting device, such as a transmitter.
  • the entity 1000 may also be configured as a receiving device, such as a receiver.
  • the entity 1000 may also be configured to have both transmitting and receiving functions, such as a transceiver.
  • the entity 1000 comprises a processor 1001, a memory 1002 coupled to a processor 1001 and a suitable radio frequency (RF) antenna 1004 coupled to the processor 1001.
  • the memory 1002 stores a program 1003.
  • the antenna 1004 is suitable for two-way wireless communications. It should be noted that only one antenna 1004 is shown in Fig. 10, and a plurality of antennas are possible in practice.
  • the entity 1000 may be coupled to one or more exterior networks or systems, such as Internet, via data paths.
  • the program 1003 may include program instructions. When executed by the associated processor 1001, these program instructions may enable the entity 1000 to operate in accordance with the exemplary embodiments of the present application.
  • the embodiments of the present application may be implemented by computer software that may be executed by the processor 1001 of the entity 1000, or by hardware, or a combination thereof.
  • the memory 1002 may be any suitable type of memory that fits the local technical environment, and may be implemented using any suitable data storage technology, such as memory devices and systems based on semiconductor, magnetic memory devices and systems, optical memory devices and systems, fixed memory and removable memory which are non-limiting examples only. Although only one memory is shown in the entity 1000, a plurality of physically separate storage units may be present in the entity 1000.
  • the processor 1001 may be any suitable type of processor that fits the local technical environment, and may comprise one or more of: general purpose computer, special purpose computer, microprocessor, digital signal processor (DSP) and processor based on multi-core processing architecture, which are non-limiting examples only.
  • the processor 1001 is configured to generate a main preamble sequence and an auxiliary preamble sequence
  • the antenna 1004 is configured to transmit the generated main preamble sequence and auxiliary preamble sequence.
  • the antenna 1004 is configured to receive a preamble based reference signal on a predefined resource
  • the processor 1001 is configured to estimate a channel according to the received preamble based reference signal and the predefined preamble based reference signal.
  • the received preamble based reference signal is constituted of the main preamble sequence, an interference generated by the main preamble sequence, an interference generated by an auxiliary preamble sequence and an interference generated by a data signal
  • the predefined resource is a resource on which the main preamble sequence is transmitted.
  • each unit in the entity 1000 is configured for implementing the exemplary embodiments in the present application. Therefore, the above operations and feathers described in connection to the drawings are also applicable to the entity 1000 and the units therein, and a detailed description thereof will be omitted herein.
  • modules described in the embodiments of the present invention can be implemented using certain hardware, software, or a combination thereof.
  • the modules described herein may be implemented in a processor.
  • a processor comprising a main preamble sequence generating unit.
  • the names of these modules in some cases do not intend to introduce any limitation to the modules themselves.
  • the main preamble sequence generating unit may also be described as “a unit for generating the main preamble sequence”.
  • a computer readable storage media which may be the computer readable storage media involved in a base station or a user’s device as discussed in the above, or a computer readable storage media individually exists rather than being fitted into any end.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Quality & Reliability (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention concerne un système de communication pré-5ème génération (5G) ou 5G pouvant prendre en charge des débits de données supérieurs, au-delà de ceux d'un système de communication de 4ème génération (4G), tel que le système d'évolution à long terme (LTE). L'invention concerne des procédés et des appareils d'émission et de réception d'un signal de référence basé sur le préambule. Le procédé d'émission d'un signal de référence basé sur le préambule consiste à générer une séquence de préambule principale et une séquence de préambule auxiliaire. Selon le procédé, sur une ressource prédéfinie, un signal synthétisé de la séquence de préambule principale et de la séquence de préambule auxiliaire est égal à un signal de référence basé sur le préambule prédéfini. Le procédé consiste ensuite à transmettre la séquence de préambule principale et la séquence de préambule auxiliaire sur la base d'une modulation multiporteuse à banc de filtres. Selon les modes de réalisation de l'invention, la séquence de préambule principale et la séquence de préambule auxiliaire sont conçues de telle sorte que le signal synthétisé sur la ressource prédéfinie est égal au signal de référence basé sur le préambule prédéfini. De cette manière, le signal de référence prédéfini peut être obtenu à l'extrémité de réception au moyen de l'interférence intrinsèque d'une modulation FBMC, ce qui permet d'obtenir une estimation de canal efficace.
PCT/KR2016/003566 2015-04-08 2016-04-06 Procédé et appareil d'émission et de réception de signal de référence basé sur le préambule Ceased WO2016163732A1 (fr)

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CN201510163486.5A CN106161316B (zh) 2015-04-08 2015-04-08 导频序列参考信号发送、接收方法及其装置
CN201510163486.5 2015-04-08
KR1020160019013A KR102270405B1 (ko) 2015-04-08 2016-02-18 프리앰블 기반 기준 신호를 송수신하기 위한 방법 및 장치
KR10-2016-0019013 2016-02-18

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WO2022257032A1 (fr) 2021-06-09 2022-12-15 Huawei Technologies Co.,Ltd. Procédé et appareil pour transmettre un signal de référence à l'aide d'un décalage à porteuse unique-qam
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