WO2012100484A1 - Procédé et dispositif de reconstitution de données - Google Patents

Procédé et dispositif de reconstitution de données Download PDF

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Publication number
WO2012100484A1
WO2012100484A1 PCT/CN2011/075295 CN2011075295W WO2012100484A1 WO 2012100484 A1 WO2012100484 A1 WO 2012100484A1 CN 2011075295 W CN2011075295 W CN 2011075295W WO 2012100484 A1 WO2012100484 A1 WO 2012100484A1
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Prior art keywords
data
soft
module
channel interleaving
scrambling
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PCT/CN2011/075295
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English (en)
Chinese (zh)
Inventor
王港
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中兴通讯股份有限公司
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Publication of WO2012100484A1 publication Critical patent/WO2012100484A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0056—Systems characterized by the type of code used
    • H04L1/0071—Use of interleaving

Definitions

  • the present invention relates to the field of communications, and in particular to a data reconstruction method and apparatus.
  • LTE Long Term Evolution
  • the Long Term Evolution (LTE) protocol specifies the sequence of bit-level processing of uplink transmitters.
  • the receiver uses the Turbo-SIC algorithm for data reconstruction.
  • Corresponding processing techniques to ensure the correct output of the signal.
  • the protocol specifies the techniques of channel interleaving, scrambling, and modulation at the bit level of the LTE transmitter; therefore, the corresponding receiving end needs to perform channel interleaving, scrambling, and modulation when using the Turbo-SIC algorithm.
  • the processing order corresponds to it.
  • the LTE receiver uses the Turbo-SIC algorithm for data reconstruction, in order to ensure the wireless performance of the receiving end, usually the soft bit information output by the Turbo decoder for reconstruction needs a relatively large bit width, according to the order of the originating end.
  • the processing sequence of signal interleaving, scrambling, and modulation needs to be performed. Since the channel interleaving needs to wait until all the data is collected, the scrambling and modulation processing can be performed.
  • This processing method increases the random access memory of the system (Random).
  • the use area of Access Memory (abbreviated as RAM) makes the design take up a lot of RAM resources. Aiming at the problem that the data reconstruction method in the related art causes the utilization of the system storage resource to be relatively low, an effective solution has not been proposed yet.
  • a data reconstruction method includes: performing scrambling operation on received uplink data of LTE; performing soft modulation on data after scrambling operation; and performing channel on soft modulation operation data Interleaving coding; data reconstruction using channel interleaved coding. Before performing the scrambling operation on the uplink data of the received long term evolution system, the method further includes: decoding the uplink data to obtain soft bit information; and performing soft rate matching on the soft bit information.
  • Performing the scrambling operation on the received uplink data of the LTE includes: using the valid signal of the soft bit information after the soft rate matching operation as the read valid signal, sequentially reading the scrambling code according to the order of the buffer, and matching the scrambling code with the rate. After the soft bit information is aligned, the soft bit is scrambled by using a scrambling code, wherein the scrambling code is buffered in the memory, and the scrambling code data generated when the uplink data is descrambled is deinterlaced.
  • Soft-modulating the data after the scrambling operation includes: performing soft modulation on the data after the scrambling operation using one of the following modulation modes: quadrature phase shift keying (QPSK), 16 quadrature amplitude modulation (QAM), 64 QAM.
  • Performing channel interleaving coding on the data after the soft modulation operation includes: zeroing the data of the position information ( Rank Indication, hereinafter referred to as RI) and channel quality information (CQI) in the channel interleaving memory.
  • RI position information
  • CQI channel quality information
  • a data reconstruction apparatus including: a scrambling module configured to perform a scrambling operation on uplink data of a received Long Term Evolution (LTE) system; a soft modulation module configured to scramble The processed data is soft-modulated; the channel interleaving module is configured to perform channel interleaving coding on the data after the soft modulation operation; and the data reconstruction module is configured to perform data reconstruction using the channel interleaved encoded data.
  • the apparatus further includes: a decoding module configured to decode the uplink data to obtain soft bit information; and a matching module configured to perform soft rate matching on the soft bit information.
  • the scrambling module is configured to read the effective signal of the soft bit information after the soft rate matching operation as the read valid signal, and sequentially read the scrambling code according to the order of the buffering, after the scrambling code is aligned with the rate-matched soft bit information,
  • the scrambling code is used to perform scrambling on the soft bits.
  • the scrambling code is buffered in the memory, and is obtained by de-channel interleaving the 4 sigma data generated by the uplink data solution.
  • the soft modulation module is configured to softly modulate the data after the scrambling operation by one of the following modulation methods: quadrature phase shift keying (QPSK), 16 quadrature amplitude modulation (QAM), and 64 QAM.
  • the channel interleaving module includes: a first zeroing module configured to perform zeroing operation on data of a position information (RI) and a channel quality information (CQI) in the channel interleaving memory; and a filling module configured to perform a soft modulation operation Data is filled into the channel interleaving memory after the zeroing operation; the second zero a module, configured to zero the data of the location of the acknowledgement information in the channel interleaving memory after the padding operation; the encoding module, configured to perform channel interleaving of the data in the channel interleaving memory after the data zeroing operation of the location of the acknowledgement information coding.
  • RI position information
  • CQI channel quality information
  • the received data is first scrambled and soft-modulated in the data reconstruction process, then the channel interleaving coding is performed, and finally the data reconstruction is performed, which solves the first problem in the data reconstruction in the related art.
  • the system hardware resource utilization ratio is relatively low.
  • FIG. 1 is a flow chart of a processing portion of a transmitting end and a receiving end of an LTE protocol according to the related art
  • FIG. 2 is a flowchart of a data reconstructing method according to an embodiment of the present invention
  • FIG. 3 is a flowchart according to an embodiment of the present invention.
  • FIG. 4 is a flowchart 1 of a data reconstruction method according to a preferred embodiment of the present invention
  • FIG. 5 is a flowchart 2 of a data reconstruction method according to a preferred embodiment of the present invention.
  • FIG. 7 is a block diagram showing a preferred structure of a data reconstruction apparatus according to an embodiment of the present invention.
  • the method includes: Step S202: Uplink data of the received LTE Perform scrambling operations; Step S204: Perform soft modulation on the data after the scrambling operation; Step S206: Perform channel interleaving coding on the data after the soft modulation operation; Step S208: Perform data reconstruction using the channel interleaved encoded data.
  • Step S202 Uplink data of the received LTE Perform scrambling operations; Step S204: Perform soft modulation on the data after the scrambling operation; Step S206: Perform channel interleaving coding on the data after the soft modulation operation; Step S208: Perform data reconstruction using the channel interleaved encoded data.
  • the method further includes: decoding the uplink data to obtain soft bit information; and performing soft rate matching on the soft bit information.
  • the bit width of the data is reduced.
  • performing the scrambling operation on the received uplink data of the LTE comprises: using the valid signal of the soft bit information after the soft rate matching operation as the read valid signal, and sequentially reading the scrambling code according to the order of the buffer, in the scrambling code After being aligned with the rate-matched soft-bit information, the scrambling code is used to scramble the soft bits, where the scrambling code is buffered in the memory, and the scrambling code data generated when the uplink data is descrambled is de-channel-interleaved. .
  • the accuracy of scrambling after changing the process and the utilization of hardware resources are achieved.
  • a preferred embodiment of step S204 is described below.
  • Softly modulating the data after the scrambling operation includes: Performing soft modulation on the data after the scrambling operation using one of the following modulation modes: Quadrature Phase Shift Keying (QPSK for short), 16 positive Quadrature Amplitude Modulation (QAM), 64 QAM. With this preferred embodiment, the diversity of modulation is increased. Preferably, a preferred embodiment of step 4 S206 is described below.
  • the data of the position of the acknowledgment information in the channel interleaving memory is set to zero; the data in the channel interleaving memory after the data is zeroed at the position of the acknowledgment information is subjected to channel interleaving coding.
  • the accuracy of data channel interleaving is achieved.
  • FIG. 3 is a schematic diagram of a receiver data reconstruction part according to an embodiment of the present invention, as shown in FIG. :
  • the 4 U code calculated by 4 U code is stored in the de-channel interleaving matrix RAM, and the output result of the de-channel interleaving matrix RAM is stored in the scrambling code storage RAM, and the output of the rate-matched data and the scrambling code storage RAM is output.
  • the processing is performed by adding 4, and then soft-modulated, and finally sent to the channel interleaving matrix RAM for channel interleaving processing.
  • the method includes the following steps: Step S302, generating a 4th code sequence in the solution 4 module; Step S304, aligning the scrambling code sequence with the received data to perform a channel deinterleaving operation; Step S306, performing de-channel interleaving processing
  • the scrambling code sequence is sequentially stored in the RAM of the scrambling module in the order of reading; in step S308, when the data is reconstructed, the Turbo decoding is first performed to obtain the soft bit information, and then the soft rate matching processing is performed.
  • the soft bit to be obtained is added in step S310, and the soft modulation operation is performed in step S312.
  • step S310 when the scrambling process is performed, the effective signal of the rate-matched soft bit is used as the read valid signal, and the scrambling code is disturbed.
  • the code storage RAM is sequentially read out in the order of the storage, and the soft bits are added after being aligned with the rate-matched soft bits;
  • step S312 softening the scrambled data, and inputting the second-order modulation
  • the likelihood ratio of the symbol is calculated to obtain the modulated soft symbol, and the IQ data is modulated according to the three modulation methods of QPSK, 16QAM and 64QAM, and stored in the channel interleaving RAM;
  • Step S314 after the data of the RI and CQI positions in the channel interleaving RAM is zero-added, the data symbols obtained by the soft modulation are stored in the RAM of the channel interleaving.
  • the data of the ACK position is also set. Zero, otherwise, no operation, then perform channel interleaving operation on the data in the interleaving RAM, and send the result of channel interleaving to the symbol level processing module; finally, the signal of the symbol level processing module is interleaved according to the frequency band occupied by the symbol level processing module.
  • the number of subcarriers is subjected to DFT processing to complete the reconstruction process of symbol level data.
  • the preferred embodiment provides a method for data reconstruction when the LTE uplink receiver uses the Turbo-SIC algorithm without affecting system performance, and solves the RAM resource consumption comparison in the existing channel deinterleaving process. Big problem.
  • Embodiment 2 This embodiment provides a data reconstruction method.
  • FIG. 4 is a flowchart of a data reconstruction method according to a preferred embodiment of the present invention, as shown in FIG. As shown, the method includes: Step S402: The data reconstruction process begins. Step 4: S404: The Turbo decoding module decodes the received data. Preferably, the soft bits are obtained by decoding the soft bits for Turbo decoding, wherein the soft rate matching is performed according to
  • the three modulation modes QPSK, 16QAM and 64QAM output data in parallel with 2, 4 and 6 channels.
  • the scrambling code sequence is read from the buffer of the scrambling code storage module, and is aligned with the data for scrambling and soft modulation processing.
  • the special soft processing is performed in units of Resource Element (RE), so the RE symbol (IQ data) is obtained after the soft modulation is completed.
  • Step S406 The soft rate matching module performs soft rate on the decoded data. match.
  • Step S408 It is judged whether the channel interleaving RAM UCI data is filled out. If the judgment result is yes, step 4 is performed S418, and if the judgment result is no, step 4 is performed S410.
  • Step S412 The 4th code generation module generates 4 U.S. code.
  • Step S414 The generated scrambling code is stored in a de-channel interleaving module for processing.
  • Step S416 The data processed by the de-channel interleaving module is stored in the 4 U code storage module.
  • step S416 the scrambling code is stored in the buffer of the de-channel interleaving, and when the channel interleaving output is output, the output will be output.
  • the scrambling sequence is cached separately. Since channel interleaving and de-channel interleaving are completely symmetric and inverse operations for a user, the 4 sigma generated by the above method can be used when adding 4 times. Another way is to generate the scrambling code separately and interleave the channel, but this method requires additional hardware resources to implement, and the implementation cost is relatively high.
  • Step S418 The scrambling code stored by the scrambling code storage module and the data of the channel interleaving RAM UCI are sent to the processing module for processing.
  • Step S420 The data processed by adding the 4 special module is sent to the soft modulation module for processing.
  • Step S422 The data processed by the soft modulation module is sent to the channel interleaving module for processing. It should be noted that the channel interleaving is occupied by a large amount of RAM resources, and the scrambling and soft modulation modules after channel interleaving are pipelined, so signal interleaving, scrambling and soft modulation can be analyzed as a whole. Considering that the soft bit is soft-modulated, the bit width is greatly reduced.
  • the processing method of the scrambling and soft modulation module before the channel interleaving module is performed, the RAM occupation resource is significantly reduced, and the system is There is no loss in overall latency and wireless performance.
  • the scrambling code sequence generated by the scrambling code generating module is stored in the buffer of the de-channel interleaving with the data, and then stored in the buffer of the scrambling code storage module, and stored in the cache. Only the scrambling code of the data location is reserved, the UCI location scrambling code is not stored, and the scrambling code and the stored data of the acknowledgment (ACK) and the data coincidence position are both set to zero, and the scrambling code sequence and data are stored in units of RE.
  • Step S424 It is determined whether the ACK location data is set to zero. If the determination result is yes, step S428 is performed; otherwise, step S426 is performed. Step S426: Waiting for the channel interleaving RAM ACK position data to be zeroed. Step S428: The data after the ACK is set to zero is sent to the discrete Fourier transform module for processing. Specifically, the data of the RI and CQI positions in the channel interleaving RAM is subjected to zero processing according to the UCI time-frequency resource, and then the RE data symbol obtained by the soft modulation is stored in the channel interleaved RAM. If the current user has an ACK, the ACK is performed. The location data is overwritten with zeros.
  • Step S430 The data reconstruction process ends. Specifically, the data of the channel interleaving is subjected to discrete Fourier transform (DFT) transform and interference cancellation processing to complete the data reconstruction process in the Turbo-SIC algorithm, and the number of points of the DFT transform is the number of subcarriers occupied by the user.
  • DFT discrete Fourier transform
  • Embodiment 3 This embodiment provides a data reconstruction method. This embodiment combines the above embodiments and preferred embodiments thereof.
  • the LTE system is a frequency division duplex (FDD) 20M bandwidth
  • the current user occupies 100 RBs
  • the uplink uses 2x4 multi-user-multiple input multiple output (MU-MIMO) transmission mode, pairing
  • the two user labels are U1 and U2; the base station is received by 4 antennas, the modulation mode is 64QAM, the cyclic prefix (CP) type is normal CP, there is no sounding pilot signal, and there is no physical uplink control channel (PUCCH) channel.
  • UCI Uplink Control Information
  • RI RI
  • Turbo-SIC algorithm is used for data analysis of MU-MIMO users.
  • Step 1 Baseband uplink receives the baseband IQ number of the 4 antennas sent by the RRU, and then buffers the OFDM. After demodulation processing, channel estimation and physical layer correlation measurement are performed on the pilot signals on symbols 3 and 10, and channel estimation is performed on the data positions of other symbols by using the estimated channel estimation values, and channel estimation values and IQ data are sent.
  • the equalization module is started, and the 4th code generation module is started to calculate the initial value of the 4th code;
  • Step 2 The equalization module uses the MMSE algorithm to complete the functions of data equalization and antenna merging, and obtains two paths of data U1 and U2; respectively, for U1 and U2 Performing IDFT conversion of 1200 points, and generating a 6-bit scrambling code of the corresponding data after IDFT transformation, and splicing the IDFT-transformed data and its corresponding 6-bit scrambling code into the RAM of the de-channel interleaving.
  • the cache is performed;
  • Step 3 The U1 data is processed first, and the U1 data buffered in the channel interleaving module RAM is decomposed and interleaved, and the processed data is processed.
  • the processing for solving the mediation disturbance is pipeline processing, and the descrambled data is sent to the de-rate matching module in a 6-bit per cycle format.
  • Step 4 After de-rate matching processing, the data is divided into 3 The circuit is simultaneously sent to the Turbo decoding core for Turbo iterative decoding, and after a suitable number of iterations, three LLR soft bit data without decision are obtained. After performing soft rate matching on the LLR soft bit data, the number of LLR soft bits is obtained.
  • Step 5 reading the 6-bit scrambling code sequence from the scrambling buffer RAM Six LLR soft bit data are scrambled, and then the scrambled 6 LLR soft bit data is soft modulated according to the 64QAM modulation format to obtain a complex valued symbol and sent to the channel interleaving module, where scrambling and soft modulation
  • the modules are all 3 ⁇ 4i water treatment;
  • Step 6 The channel interleaving module first needs to fill in the position of the UCI (including RI and CQI/PMI) positions in the channel interleaving RAM, and the input data of the 4 soft modulation module will be skipped after the processing is completed.
  • the location of the UCI is sequentially stored in the channel interleaving RAM. After all the data of the current user is stored, the position of the ACK in the RAM is set to zero. After completion, the data in the channel interleaving RAM is interleaved and processed, and then sent to the DFT processing module.
  • Step 7 Perform 1200-point DFT conversion on the data, and then perform interference cancellation with the antenna data buffered in the OFDM demodulation module to obtain the offset data U1', and then follow the blue in FIG. According to the TB of data processing flow obtained U2;
  • Step 8 DFT processing starts when data of U1, U2 data processing flow starts, TB data obtained as described in step 4 of U1 poly 3, 4, 5, 6 and 7.
  • FIG. 6 is a structural block diagram of a data reconstruction apparatus according to an embodiment of the present invention.
  • the apparatus includes: a scrambling module 62, a soft modulation module 64, the channel interleaving module 66, the data reconstruction module 68, the following structure is described in detail: the scrambling module 62 is configured to perform scrambling operation on the received uplink data of the LTE; the soft modulation module 64 is connected to the The scrambling module 62 is configured to perform soft modulation on the data after the scrambling operation of the scrambling module 62.
  • the channel interleaving module 66 is connected to the soft modulation module 64, and is configured to perform channel interleaving coding on the data after the soft modulation operation of the soft modulation module 64.
  • the data reconstruction module 68 is configured to perform channel reconstruction using the channel interleaving encoded data by the channel interleaving module 66.
  • the scrambling module 62 is configured to use the valid signal of the soft bit information after the soft rate matching operation as the read valid signal, and sequentially read the 4th code in the order of the buffer, and after the matching and the rate matching After the bit information is aligned, the soft bit is scrambled by using a scrambling code, wherein the scrambling code is buffered in the memory, and is obtained by deinterleaving the scrambled data generated when the uplink data is descrambled.
  • the soft modulation module 64 is configured to softly modulate the data after the scrambling operation by one of the following modulation modes: QPSK, 16 QAM, 64 QAM. FIG.
  • FIG. 7 is a block diagram of a preferred structure of a data reconstruction apparatus according to an embodiment of the present invention.
  • the apparatus further includes: a decoding module 72 and a matching module 74.
  • the channel interleaving module 66 includes: a first zeroing module. 662.
  • the decoding module 72 is configured to decode the data to obtain soft bit information.
  • the matching module 74 is coupled to the decoding module 72 and configured to perform soft rate matching on the soft bit information obtained by the decoding module 72.
  • the channel interleaving module 66 includes: a first zeroing module 662, configured to perform zeroing operation on the rank information and the channel quality information in the channel interleaving memory; the filling module 664 is connected to the first zeroing module 662, and is configured to The data after the soft modulation operation is filled into the channel interleaving memory subjected to the zeroing operation; the second zeroing module 666 is connected to the padding module 664, and is set to set the data of the position of the acknowledgement information in the channel interleaving memory after the padding operation.
  • the encoding module 668 is coupled to the zeroing module 662 and configured to perform channel interleaving encoding on the data in the channel interleaving memory after the data zeroing operation of the position of the acknowledgment information.
  • the effect of saving the interleave matrix RAM is achieved by using the order of scrambling, soft modulation and channel interleaving when the adjustment signal is reconstructed.
  • the data bit width after rate matching is larger for each RE symbol bit width, and the soft modulated data bit width is greatly reduced, minus the RAM resources occupied by the scrambling code storage, saving about 60% of RAM resources.
  • the solution provided by this embodiment is also applicable to the design of the transmitting end specified by the LTE protocol. Obviously, those skilled in the art should understand that the above modules or steps of the present invention can be implemented by a general-purpose computing device, which can be concentrated on a single computing device or distributed over a network composed of multiple computing devices.
  • the invention is not limited to any specific combination of hardware and software.
  • the above is only the preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes can be made to the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the scope of the present invention are intended to be included within the scope of the present invention.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Detection And Prevention Of Errors In Transmission (AREA)
  • Error Detection And Correction (AREA)

Abstract

La présente invention concerne un procédé et un dispositif de reconstitution de données. Ledit procédé consiste : à réaliser une opération d'embrouillage sur les données montantes reçues correspondant à la technologie d'évolution à long terme (LTE) (S202); à mettre en œuvre une modulation douce sur les données qui ont subi l'opération d'embrouillage (S204); à effectuer un codage par entrelacement de canaux sur les données qui ont subi l'opération de modulation douce (S206); et à mener à bien la reconstitution de données à l'aide des données qui ont subi le codage par entrelacement de canaux (S208). Grâce à cette invention, le facteur d'utilisation des ressources de stockage du système est amélioré.
PCT/CN2011/075295 2011-01-25 2011-06-03 Procédé et dispositif de reconstitution de données WO2012100484A1 (fr)

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CN104396175B (zh) * 2013-06-25 2017-11-17 华为技术有限公司 一种检测上行控制信道上发送的信号的方法、装置和设备
CN106559373A (zh) * 2015-09-28 2017-04-05 普天信息技术有限公司 一种适合离散频谱的sc-ofdm信号收发方法、装置及系统
CN109426636B (zh) * 2017-08-22 2021-10-01 深圳市中兴微电子技术有限公司 一种fpga片间高位宽数据传输的方法及装置

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CN101777962A (zh) * 2009-12-22 2010-07-14 华为技术有限公司 上行数据处理方法、装置和基站

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