WO2009052736A1 - Procédé, système et appareil de réception et de combinaison - Google Patents

Procédé, système et appareil de réception et de combinaison Download PDF

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Publication number
WO2009052736A1
WO2009052736A1 PCT/CN2008/072669 CN2008072669W WO2009052736A1 WO 2009052736 A1 WO2009052736 A1 WO 2009052736A1 CN 2008072669 W CN2008072669 W CN 2008072669W WO 2009052736 A1 WO2009052736 A1 WO 2009052736A1
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WO
WIPO (PCT)
Prior art keywords
data
receiving
symbols
modulation
unit
Prior art date
Application number
PCT/CN2008/072669
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English (en)
Chinese (zh)
Inventor
Tao Wu
Hufei Zhu
Yinwei Zhao
Hongjie Si
Shaowei Ge
Original Assignee
Huawei Technologies Co., Ltd.
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.)
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Application filed by Huawei Technologies Co., Ltd. filed Critical Huawei Technologies Co., Ltd.
Publication of WO2009052736A1 publication Critical patent/WO2009052736A1/fr

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Classifications

    • 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
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1829—Arrangements specially adapted for the receiver end
    • H04L1/1835—Buffer management
    • H04L1/1845—Combining techniques, e.g. code combining
    • 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
    • H04L1/02—Arrangements for detecting or preventing errors in the information received by diversity reception
    • H04L1/06—Arrangements for detecting or preventing errors in the information received by diversity reception using space diversity

Definitions

  • the present invention relates to the field of mobile communication technologies, and in particular, to a reception combining technique.
  • Hybrid Automatic Repeat Request (HARQ) technology has become one of the key technologies to improve reliability.
  • HARQ technology is based on Automatic Repeat Request (ARQ) technology and forward direction.
  • FEC Forward Error Correction
  • CRC Cyclic Redundancy Check
  • the HARQ technology performs data retransmission based on the feedback of the receiving end, which essentially achieves the effect of the time diversity technique.
  • Diversity technology is also an effective way to improve system performance.
  • the diversity technology is that a set of data is transmitted separately on at least two transmit diversity of the transmitting end, and the data symbols respectively transmitted on at least two transmit diversity are received and combined at the receiving end.
  • transmit diversity including: time diversity, which means transmitting the same data symbols or appropriate combinations at different times; small set, which means transmitting the same data symbols or different combinations in different cells.
  • Polarization diversity refers to the transmission of the same data symbols or their appropriate combinations in different polarization directions of the same antenna; frequency diversity refers to the transmission of the same data symbols or their appropriate combinations in different frequency bands; spatial diversity, Means transmitting the same data symbols or their appropriate combinations on different antennas; code diversity means transmitting the same data symbols or different combinations using different spreading codes; Relay diversity means Different data symbols or appropriate combinations thereof are transmitted between different relay stations (RSs) or between RSs and base stations (BSs).
  • RSs relay stations
  • BSs base stations
  • FIG. 1 which is a block diagram of a HARQ-based receiving and combining system in the prior art
  • a group of data added with a CRC check code at the MAC layer is sent to the physical layer for transmission; after FEC encoding
  • the information bits are modulated into constellation point modulation symbols through constellation mapping.
  • high-order modulation is generally adopted.
  • the constellation point modulation symbols are called data symbols when transmitting, and multiple data symbols are in the form of data packets.
  • the transmitting unit is sent to the channel.
  • the receiving unit receives the data packet transmitted through the channel, demodulates the data symbols therein after interference cancellation, and buffers the demodulated Log Likelihood Ratio (LLR), and the LLR also This is called soft bit information, and finally FEC decoding is performed on the soft bit information.
  • LLR Log Likelihood Ratio
  • FEC decoding is performed on the soft bit information.
  • the receiving end needs to perform reception and combining, and then perform CRC check on the received data.
  • the receiving and combining method is: performing demodulation on the data symbols in the retransmitted data packet after interference cancellation, buffering the demodulated soft bit information, and demodulating the previously buffered data.
  • the soft bit information is merged.
  • the transmitting end is notified by the feedback to transmit the next set of data; if the receiving end verifies the data error through the CRC, the transmitting end is notified by the transmitting end to retransmit the data.
  • the transmission of the set of data ends until the data is verified by the CRC or the maximum number of retransmissions is reached.
  • the constellation diagram of the high-order modulation can usually be composed of the constellation diagrams of the low-order modulation through proper combination. In the process of combining, the corresponding coefficients of the low-order constellation diagrams need to be multiplied, and the coefficients are collectively referred to as modulation factors.
  • the high-order constellation point modulation symbol is composed of a plurality of low-order constellation point modulation symbols and different modulation factors, and different modulation factors lead to decoding reliability at the receiving end. The difference makes the error correction code performance difficult to achieve optimal. Therefore, in the prior art, a method of constellation recombination is proposed.
  • the method of constellation recombination is to change the constellation mapping rule of information bits every time data retransmission, so that the soft bit information of the combined end of the receiving end obtains a more average decoding reliability.
  • the constellation recombination method used in the prior art is introduced, for example, the information bit is transmitted at the moment, ⁇ 3 , where b .
  • Embodiments of the present invention provide a receiving and combining method, system, and device for improving system performance, and improving channel capacity and spectrum utilization of the system.
  • Receiving device configured to receive and buffer the data symbols transmitted by the transmitting device, perform the demodulation and decoding to obtain the combined received data after the data symbols are combined by interference cancellation and symbols.
  • Demodulation unit 2024 configured to demodulate data symbols output by interference cancellation unit 2023 to obtain information, typically log likelihood information;
  • An embodiment of the present invention provides a receiving and merging method, including the following steps: Al, assuming that a set of data is transmitted at the moment, the information bits after FEC encoding are ⁇ 3 , mapped to the Quadrature Phase Shift Modulation (QPSK) constellation point modulation symbol x , mapped to QPSK constellation point modulation.
  • Al assuming that a set of data is transmitted at the moment, the information bits after FEC encoding are ⁇ 3 , mapped to the Quadrature Phase Shift Modulation (QPSK) constellation point modulation symbol x , mapped to QPSK constellation point modulation.
  • QPSK Quadrature Phase Shift Modulation
  • Equation [14] can be obtained from equation [13]:
  • the same 1 can also take the form of ( ) H, and the effect is equivalent. Similarly, it means sending signal power
  • the receiver and the interference cancellation receiver can solve the x and ⁇ added to the influence of the channel noise, thereby realizing the symbol level combining at the receiving end, and further demodulating and decoding can obtain the received data. .
  • MIMO Multiple Input Multiple Output
  • MIMO technology is a spatial diversity technology that utilizes multiple inputs and multiple outputs of one channel. Extreme The earth improves the spectrum utilization of the system and the coverage of the base station.
  • the dual-transmitting dual-receiving system is taken as an example for description. Referring to FIG. 5, the transmitting unit and the receiving unit are both transmitting and receiving diagrams of dual antennas.
  • the embodiment of the present invention assumes that at a certain moment, after the data of the CRC check code added by the MAC layer is FEC-encoded, the information bits to be transmitted in antenna #1 and antenna #2 are b A k and b A b A , respectively.
  • ⁇ and b A are respectively mapped to QPSK constellation point modulation symbols ⁇ and b ⁇ and b 6 b i are respectively mapped to QPSK constellation point modulation symbols ⁇ and ⁇ 2 ;
  • ⁇ ⁇ , ⁇ have modulation factors respectively ⁇ , superimposed into a 16QAM constellation point modulation symbol transmitted at antenna #1, the modulation factor of ⁇ , respectively, is,, of course, ⁇ , the modulation factor may also be a reselection of a set of modulation factors according to the constellation recombination strategy in the prior art.
  • the overlays 16QAM modulation symbol constellation points in the transmitter antenna # 2 may of course be ⁇ ⁇ , transmitting antenna # 2, X2, ⁇ Launched at antenna #1.
  • a set of data respectively transmitted on antenna #1 and antenna #2 may be modulated according to respective constellation mapping modes. If the constellation mapping mode adopted by antenna #1 and antenna #2 is mode 1 on the first time diversity, According to the optimized constellation reorganization strategy, please refer to FIG. 6.
  • Modes 2 to 19 are all modes of the constellation mapping mode that antenna #1 and antenna #2 can adopt respectively on the second time diversity, and modes 2 to 10 are in the second ⁇ ⁇ divided on the time diversity, transmitting antenna # 1 is still ⁇ and an X2, transmitting antenna # 2 ⁇ still given pattern ⁇ ⁇ 11-19 is on the second time diversity, transmitting antenna # 2 ⁇ and X2 , ⁇ are given at antenna #1.
  • Modes 2 to 19 are based on “the sum is a real number, given by the embodiment of the present invention” and the first optimized constellation recombination scheme when both are real numbers: constellation mapping adopted by antenna #1 and antenna #2 on the first time diversity respectively
  • the mode is mode 1
  • the constellation mapping mode adopted by antenna #1 and antenna #2 on the second time diversity is any one of modes 2 to 19, and the order of two transmissions in two sets of modes can be exchanged.
  • the data retransmission based on the optimized constellation recombination strategy provides a receiving and merging method, including the following steps: bl, assuming that a set of data is transmitted at time ⁇ , and antenna #1 and antenna #2 are sent after FEC encoding
  • the information bits are 0 ⁇ 2"3 and 3 ⁇ 5 ⁇ 5 ⁇ 6, respectively, and 4 5 are mapped to the QPSK constellation point modulation symbols ⁇ ⁇ , 2 , and ⁇ 7 respectively mapped to the QPSK constellation point modulation symbol ⁇ ; ⁇ ⁇ ,
  • the modulation factor of ⁇ is ", ⁇ , information bit ⁇ 3 is adjusted
  • Constellation mapping method used when ⁇ ⁇ 2 ⁇ 2 + ⁇ 2
  • the receiving end receives the data symbol transmitted by the channel and buffers it, and assumes that the data symbol received by the data symbol after receiving the channel is transmitted, and after demodulation and FEC decoding, performs CRC on the decoded received data. Verification, if the reception is correct, indicating that the transmission of the data of the group is successfully completed, the buffered data symbols are cleared, and the sender transmits the next set of data through feedback; if the CRC check finds that the data transmitted at the time is incorrect, Then, the transmitting end retransmits the group data through the HARQ request, and continues to perform b3; b3.
  • the corresponding optimization can be selected according to "the sum is a real number or an imaginary number. Constellation recombination scheme, assuming that "and ⁇ is a real number, according to the first optimized constellation recombination scheme, after being modulated by the constellation mapping method, the transmitted data symbols are any one of modes 2 to 19;
  • the receiving end receives the retransmitted data symbol and buffers it, and assumes that the retransmitted data of the group is received by the channel, and the data symbol received at the receiving end is 3 ⁇ 4 , and the receiving end passes, and simultaneously passes through the interference canceling receiver. Detecting signals to eliminate interference from related channels, eliminating further demodulation and FEC decoding after interference;
  • the reception data decoded CRC check if correctly received, the set of data shows that the transmission is completed successfully, the cache is cleared of data symbols, and, 3 ⁇ 4, and the transmission side transmits the next set of data notified by feedback; If the set of data transmitted at the moment is found to be erroneous by the CRC check, the transmitting end resends the set of data through the HARQ request;
  • the interference cancellation receiver employed is an LMMSE or ZF receiver.
  • the following two processing schemes can be adopted. The implementation principles are respectively introduced below. First, the processing scheme 1 is introduced. For the data packets transmitted on the two antennas at the moment, if the mode 1 is adopted, the two data symbols received by the receiving end can be expressed as:
  • the modulation factor of x and ⁇ is ", ⁇ , " and can be a real number or a complex number.
  • the first optimized constellation recombination scheme is adopted.
  • 0 ⁇ is a complex number
  • the second optimized constellation recombination scheme can be adopted.
  • the following is a description of the receiving principle using the first optimized constellation recombination scheme and the second optimized constellation recombination scheme. Because mathematically, the real number is only a complex number ATT e Z, ", that is, a real number. Special form, for example The conjugate of a real number is the real number itself.
  • an example is given to introduce the receiving principle of the first two optimized constellation recombination schemes.
  • the two data symbols of the formula [17] can be obtained as the formula after the interference cancellation operation.
  • ⁇ ⁇ + ⁇ ⁇ ⁇ ⁇ + ⁇ ⁇ + f x ⁇ ⁇ , ⁇ 2 .
  • [18] Represents functions related to 1 and other related parameters, such as Xl , y X 2, 2, etc.
  • r 22 h 2 P x 2 ⁇ y2) + h 22 P , -ay,) + n 4
  • Equations [28] and [29] are available from equations [18] and [27]
  • the receivers can solve the x i, X2 , and y ⁇ added to the channel noise through the interference cancellation receiver, thereby realizing the symbol level combination at the receiving end, further demodulating and Decoding can get the received data.
  • All of the above three optimized constellation recombination schemes are based on the implementation of 16QAM, that is, the specific implementation of the modulation order is 2.
  • the optimized constellation reorganization strategy provided by the embodiment of the present invention is also applicable to other modulation modes such as 8PSK, 8APSK, 64QAM. , 128QAM, etc.
  • the data symbol transmitted at the 2nd time may be X +ry +0: Z ⁇
  • the data symbols of the at least one transmission may be combined to obtain the received data, thereby improving system performance.
  • FIG. 7 a comparison diagram of a method for receiving and merging data retransmission according to an embodiment of the present invention and a method for receiving and merging in the prior art is performed by computer simulation, and it can be seen that the error frame is reduced.
  • the rate and bit error rate increase the channel capacity and spectrum utilization of the system.
  • the data retransmission-based receiving and combining method provided by the embodiment of the present invention is applied to at least one data transmission performed by using the HARQ technology at different times, and the set of data may also be based on the transmit diversity technology at different times, different cells, and different Number of antennas, different polarization directions, different frequency bands, different spreading codes, different relay base stations, etc. According to the transmission, it is also necessary to receive and merge data at the receiving end.
  • the embodiment of the present invention provides a method and a system for receiving and merging based on a transmit diversity. As shown in FIG. 8, the method for receiving and merging based on the transmit diversity provided by the embodiment of the present invention includes:
  • the group is The modulation factor of the same information bit allocation in the data is different;
  • Transmitting device for transmitting data symbols obtained by separately modulating a group of data on at least two transmit diversity branches; receiving device: for receiving and buffering data symbols transmitted by the transmitting device, and subjecting the data symbols to interference cancellation and symbols After the combination, demodulation and decoding are performed to obtain the combined received data.
  • the method for receiving and combining data retransmission and other transmit diversity can be used simultaneously in the system, and a specific application scenario is a MIM0 system based on HARQ technology.
  • the MIM0 system is a dual-transmit dual-receiving system
  • the information bits to be transmitted in antenna #1 and antenna #2 are both Z ⁇ 3 , including the steps: cl, ⁇ moments in two spatial transmit diversity branches, ie antenna #1 and
  • the group of data is respectively transmitted on the antenna #2; preferably, when the group of data is separately modulated on the two spatial transmit diversity branches, the modulation factors allocated to the same information bits in the set of data are different;
  • the data symbols ⁇ ⁇ , , ⁇ , 2 ⁇ can As the multi-channel data symbols transmitted on the virtual antenna array, the data combining method on each diversity branch uses ZF, L-MMSE, ML, SIC, PIC and other interference cancellation techniques for signal detection;

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Radio Transmission System (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)

Abstract

La présente invention concerne une technologie de réception et de combinaison dans le domaine de la technologie de télécommunication mobile. Le procédé, le système et l'appareil qui sont fournis dans des modes de réalisation de la présente invention améliorent efficacement les performances du système. Le procédé de réception et de combinaison basé sur la retransmission de données comprend les étapes consistant à : recevoir et mettre en mémoire tampon le symbole de données d'un groupe de données qui a été transmis au moins deux fois ; après le traitement du symbole de données, combiner, démoduler et décoder l'annulation de l'interférence et le symbole pour obtenir les données de réception combinées. Le système de réception et de combinaison basé sur la retransmission de données comprend un appareil émetteur et un appareil récepteur. Les modes de réalisation de la présente invention proposent un appareil émetteur et un appareil récepteur. Des modes de réalisation de la présente invention proposent un procédé et un système de réception et de combinaison basés sur la diversité des transmissions.
PCT/CN2008/072669 2007-10-19 2008-10-13 Procédé, système et appareil de réception et de combinaison WO2009052736A1 (fr)

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CN102387105B (zh) * 2010-08-30 2014-11-05 华为技术有限公司 调制方法和装置
CN107360447B (zh) * 2014-04-28 2020-02-14 上海数字电视国家工程研究中心有限公司 广播系统
US10700803B2 (en) 2014-08-15 2020-06-30 Huawei Technologies Co., Ltd. System and method for generating codebooks with small projections per complex dimension and utilization thereof
US10523383B2 (en) 2014-08-15 2019-12-31 Huawei Technologies Co., Ltd. System and method for generating waveforms and utilization thereof
CN104283644B (zh) * 2014-11-03 2018-06-19 大唐移动通信设备有限公司 一种上行协同多点的数据译码方法和设备
CN113645012A (zh) * 2015-08-14 2021-11-12 索尼公司 无线通信网络中的电子设备和方法
WO2017071586A1 (fr) 2015-10-30 2017-05-04 Huawei Technologies Co., Ltd. Système et procédé pour accès multiple à codes peu denses haut débit en liaison descendante
CN107634824B (zh) 2016-07-19 2021-02-12 华为技术有限公司 传输信号的方法和装置
US10756853B2 (en) 2016-10-21 2020-08-25 Huawei Technologies Co., Ltd. Method and device for incremental redundancy hybrid automatic repeat request (IR-HARQ) re-transmission

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1253700A (zh) * 1996-12-03 2000-05-17 艾利森电话股份有限公司 码分多址蜂窝通信系统中的无痕软切换
CN1783749A (zh) * 2004-10-06 2006-06-07 美国博通公司 用于处理接收信号的方法和系统
CN2932845Y (zh) * 2006-01-10 2007-08-08 傅海阳 码分多址/时分多址移动通信设备
CN101039136A (zh) * 2006-03-15 2007-09-19 华为技术有限公司 基于空频编码的多天线发射分集方法及其系统

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1253700A (zh) * 1996-12-03 2000-05-17 艾利森电话股份有限公司 码分多址蜂窝通信系统中的无痕软切换
CN1783749A (zh) * 2004-10-06 2006-06-07 美国博通公司 用于处理接收信号的方法和系统
CN2932845Y (zh) * 2006-01-10 2007-08-08 傅海阳 码分多址/时分多址移动通信设备
CN101039136A (zh) * 2006-03-15 2007-09-19 华为技术有限公司 基于空频编码的多天线发射分集方法及其系统

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