WO2013007146A1 - Procédé de transmission et dispositif pour le multiplexage spatial en boucle ouverte avec un système d'antennes montantes multiples - Google Patents

Procédé de transmission et dispositif pour le multiplexage spatial en boucle ouverte avec un système d'antennes montantes multiples Download PDF

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Publication number
WO2013007146A1
WO2013007146A1 PCT/CN2012/077378 CN2012077378W WO2013007146A1 WO 2013007146 A1 WO2013007146 A1 WO 2013007146A1 CN 2012077378 W CN2012077378 W CN 2012077378W WO 2013007146 A1 WO2013007146 A1 WO 2013007146A1
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WO
WIPO (PCT)
Prior art keywords
information
processing
precoding
open
transmitting
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PCT/CN2012/077378
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English (en)
Chinese (zh)
Inventor
杨维维
郝鹏
夏树强
梁春丽
王瑜新
Original Assignee
中兴通讯股份有限公司
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Publication of WO2013007146A1 publication Critical patent/WO2013007146A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0697—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using spatial multiplexing

Definitions

  • the present invention relates to wireless communication technologies, and in particular, to a method and apparatus for transmitting open-loop space multiplexing of an uplink multi-antenna system. Background technique
  • a higher data rate can be obtained by using spatial multiplexing technology, that is, transmitting multiple times using the same time-frequency resource at the transmitting end.
  • the data stream, at the receiving end can obtain the channel coefficient matrix through channel estimation, and then demodulate the data on each data stream.
  • the spatial multiplexing method includes Open-loop spatial multiplexing and Close-loop spatial multiplexing.
  • the closed-loop spatial multiplexing refers to precoding the signal at the transmitting end according to the channel state information (CSI).
  • FIG. 1 is a closed-loop spatial multiplexing multiple input multiple output (MIMO) antenna system.
  • the structure diagram includes: a pre-coding pre-processing module at the transmitting end, a pre-encoding module, a pre-coding post-processing module, and a multi-antenna processing module at the receiving end, a receiving processing module, a codebook selecting module, and a feedback channel; wherein, the pre-coding of the transmitting end is known
  • the module, the pre-coding pre-processing module of the transmitting end encodes, modulates, layer maps, etc. the transmitted information, and then transmits the MIMO antenna through the pre-encoding module and the pre-coding post-processing module, and the receiving end passes the multi-antenna processing module and the receiving processing module.
  • the received information is decoded and demodulated.
  • the sender needs to pre-code the information based on the CSI.
  • One of the ways for the sender to obtain the CSI is through the feedback from the receiver.
  • the general method is to save the same codebook (precoding) at the receiving end and the transmitting end.
  • Matrix set The receiving end selects a suitable precoding matrix in the codebook according to the current channel condition, and feeds back the PMI (Per-Coding Metric Indicator) in the set back to the transmitting end, and the sending end finds the pre-PMI according to the feedback.
  • the coding matrix is precoded with the transmitted signal.
  • the open-loop spatial multiplexing means that the transmitting end does not pre-code the signal according to the channel state information sent by the receiving end, but performs pre-coding processing on the signal according to the predetermined fixed codebook combination.
  • the downlink physical shared channel supports transmission in an open-loop spatial multiplexing mode.
  • FIG. 2 shows a PDSCH transmission process in an LTE system, including: adding information to be transmitted. Interference, modulation, layer mapping, precoding, resource unit (RE) mapping, generation of orthogonal frequency division multiplexing (OFDM, Orthogonal Frequency Division)
  • OFDM Orthogonal Frequency Division
  • the precoding matrix is a matrix of ⁇ ,
  • the precoding matrix is selected in the precoding codebook configured by the base station (eNB, eNode B) and user equipment (UE, User Equipment).
  • UE User Equipment
  • FIG. 3 shows PUSCH transmission process in LTE-A system, including: The information is subjected to scrambling, modulation, layer mapping, transmission precoding, precoding, RE mapping, generation of SC-FDMA signals, and the like.
  • the method of layer mapping in SU-MIMO mode is shown in Table 5:
  • ⁇ (''"'' ⁇ U ⁇ H 3 ) indicates the corresponding layer The number of modulation symbols.
  • the uplink scheduling grant signaling for scheduling the PUSCH transmission in the SU-MIMO mode is added, and the uplink scheduling grant signaling is configured by the downlink control information (DCI, Downlink Control Information) format 4 (format 4).
  • DCI Downlink Control Information
  • a Physical Downlink Control Channel (PDCCH) is sent to the scheduled UE.
  • DCI format 4 has 3 bits (corresponding to 2 antenna ports) or 6 bits (corresponding to 4 antenna ports) for indicating precoding index information used for spatial multiplexing, called precoding and layer information. And number of layers ).
  • the LTE-A system introduces uplink open-loop spatial multiplexing.
  • the open-loop spatial multiplexing supports up to two layers of transmission; the existing uplink open-loop spatial multiplexing
  • the solution is: Considering the uplink single carrier characteristic, the layer mapped information is adopted into the open-loop spatial multiplexing transmission method, and the obtained frequency diversity gain is limited, and the transmission performance improvement of the UE in the multi-antenna system is limited. Summary of the invention
  • the main object of the present invention is to provide a method and apparatus for transmitting open-loop spatial multiplexing of an uplink multi-antenna system, which improves the transmission performance of the UE in the uplink multi-antenna system.
  • the present invention provides an uplink multi-antenna system open-loop spatial multiplexing transmission method, and the method includes:
  • the UE When transmitting the information of each codeword on the multi-antenna port, the UE performs the open-loop pre-coding process on the information after the pre-coding process;
  • the information after the open-loop precoding process is subjected to frequency domain signal processing, and the information processed by the frequency domain signal is transformed into a time domain for transmission.
  • the open-loop precoding process includes: layer interleaving and precoding processing; or precoding processing and cyclic delay processing; or layer interleaving, precoding processing, and cyclic delay processing.
  • the precoding process is: precoding processing in which different precoding codewords are cyclically used in units of symbols or time slots; or different precodings are used in units of subcarriers, subcarrier groups, or subbands. Precoding processing of coded codewords.
  • the open-loop precoding process is a precoding process in which different precoding codewords are cyclically used in units of subcarriers.
  • the method before the performing the open-loop pre-coding process, the method further includes: the UE performing the transmission pre-coding process on the information on each layer after the layer mapping.
  • the method before performing the transmission precoding process, the method further includes: the UE scrambling information of each codeword transmitted on the multiple antenna port; modulating the scrambled information; and modulating the modulated information Perform layer mapping.
  • the present invention provides an open-loop spatial multiplexing transmitting apparatus for an uplink multi-antenna system, the apparatus comprising: an open-loop precoding processing module, a frequency domain signal processing module, and an information transmitting module; wherein, the open loop precoding processing module is used When the information of each codeword is transmitted on the multi-antenna port, the information after the pre-coding process is subjected to the open-loop pre-coding process, and the information after the open-loop pre-encoding process is sent to the frequency domain signal processing module;
  • a frequency domain signal processing module configured to perform frequency domain signal processing on the information after the open loop precoding processing, and send the information processed by the frequency domain signal to the information transmitting module;
  • the information transmitting module is configured to transform the information processed by the frequency domain signal into a time domain for transmitting.
  • the open-loop precoding process includes: layer interleaving and precoding processing; or precoding processing and cyclic delay processing; or layer interleaving, precoding processing, and cyclic delay processing.
  • the open-loop precoding process is a precoding process in which different precoding codewords are cyclically used in units of subcarriers.
  • the device further includes a scrambling module, a modulation module, a layer mapping module, and a transmission precoding processing module;
  • a scrambling module configured to transmit each codeword when transmitting information of each codeword on a multi-antenna port Information is scrambled
  • a modulation module configured to modulate the scrambled information
  • a layer mapping module configured to perform layer mapping on the modulated information
  • the transmission precoding processing module is configured to perform precoding processing on the information on each layer after the layer mapping.
  • the invention provides a transmitting method and device for open-loop spatial multiplexing of an uplink multi-antenna system
  • the UE When transmitting the information of each codeword on the multi-antenna port, the UE performs open-loop pre-coding processing on the information after the pre-coding processing, and performs frequency domain signal processing on the information after the open-loop pre-coding processing, and the frequency domain signal is processed.
  • the processed information is transformed into the time domain for transmission; thus, with the solution of the present invention, the transmission performance of the UE in the uplink multi-antenna system can be improved.
  • FIG. 1 is a schematic structural diagram of a closed loop spatial multiplexing multi-antenna system in the prior art
  • FIG. 2 is a schematic diagram of a PDSCH transmission process in an LTE system in the prior art
  • FIG. 3 is a schematic diagram of a PUSCH transmission process in an LTE-A system in the prior art
  • FIG. 4 is a schematic flowchart of a method for transmitting an open-loop spatial multiplexing of an uplink multi-antenna system according to the present invention
  • FIG. 5 is a schematic structural diagram of a transmitting apparatus for implementing open-loop spatial multiplexing of an uplink multi-antenna system according to the present invention. detailed description
  • the basic idea of the present invention is: when transmitting information of each codeword on a multi-antenna port, the UE performs open-loop pre-coding processing on the information after the pre-coding process, and performs frequency-domain signal on the information after the open-loop pre-coding process. Processing, and transforming the information processed by the frequency domain signal into the time domain for transmission.
  • the present invention implements a method for transmitting open-loop spatial multiplexing of an uplink multi-antenna system. As shown in FIG. 4, the method includes the following steps:
  • Step 101 The UE scrambles information of each codeword when transmitting information of each codeword on multiple antenna ports.
  • the information of each codeword is ⁇ )( 0 ), ⁇ , ⁇ )()- is scrambled to obtain ⁇ )(0), ⁇ dress) -1), where the first codeword is represented, ⁇ ⁇ represents the number of bits of the first codeword transmission information; the specific implementation of the scrambling belongs to the prior art, and details are not described herein again.
  • Step 102 The UE modulates the scrambled information. Specifically, the UE modulates the scrambled information ⁇ , , W ( M ⁇ _ according to the modulation order to obtain ⁇ W, "', ⁇ ( ⁇ b_l And representing the number of modulation symbols transmitted by the first codeword; wherein, the UE obtains a modulation order of each codeword according to the uplink scheduling grant signaling; the specific implementation of the modulation belongs to the prior art.
  • Step 103 The UE will modulate The information is layer mapped.
  • the UE obtains the layer number information according to the uplink scheduling grant signaling, ⁇ 0 , 1 , . . . , ⁇ - 1 , where ⁇ represents the number of layers, and ⁇ represents the number of modulation symbols on each layer.
  • Step 105 The UE performs open-loop pre-coding processing on the information after the pre-coding process is transmitted.
  • the precoding process obtains that the information transmitted by each antenna is... - " ⁇ ] where, ⁇ is the index of the modulation symbol, ⁇ , ⁇ ,. ⁇ - ,
  • M symb M symb , which represents the number of modulation symbols on each layer, and p represents the number of layers;
  • the open loop precoding process may include:
  • precoding processing and loop delay processing ie:
  • L represents layer interleaving processing.
  • W denotes precoding processing
  • W(Z) C 3 ⁇ 4
  • the precoding codeword is selected in the coded codebook, and may be reconstructed.
  • the pre-encoded codebook of the open-loop spatial multiplexing is selected to be a pre-coded codeword in the existing pre-coded codebook.
  • the precoding process described above may be a precoding process in which different precoding codewords are cyclically used in units of symbols or time slots, or different precoding codes may be cyclically used in units of subcarriers, subcarrier groups, or subbands. Precoding processing of words, where the subcarrier group is composed of several consecutive subcarriers. The definitions of the subcarriers, subbands, symbols, and time slots belong to the prior art, and are not described herein again.
  • O represents cyclic delay processing
  • D is related to the number of transmitting antennas, the number of layers, and the precoding codebook, for example, when When the number of transmit antenna ports is 2,
  • the precoding codeword used is in the form of 0 y If used The precoding codeword form is
  • the open-loop precoding process may further be a precoding process in which different precoding codewords are cyclically used in units of subcarriers, that is,
  • Step 106 The UE performs frequency domain signal processing on the information after the open loop precoding processing, and transforms the information processed by the frequency domain signal into a time domain for transmitting.
  • the UE performs frequency domain signal processing on the information after the open-loop pre-coding process, transforms to the time domain, and transmits information transformed into the time domain on the multi-antenna port; wherein, the performing frequency domain signal processing
  • the pilot and/or subcarrier mapping is typically inserted.
  • the present invention further provides an apparatus for transmitting an open-loop spatial multiplexing of an uplink multi-antenna system.
  • the apparatus is located in the UE, and includes: an open-loop precoding processing module 41, and frequency domain signal processing. Module 42, information transmitting module 43; wherein
  • the open loop precoding processing module 41 is configured to perform open loop precoding processing on the information after the precoding processing, and send the information after the open loop precoding processing to the information of each codeword on the multi-antenna port.
  • the frequency domain signal processing module 42 is configured to perform frequency domain signal on the information after the open loop precoding process Processing, and transmitting the frequency domain signal processed information to the information transmitting module 43;
  • the information transmitting module 43 is configured to transform the information processed by the frequency domain signal into a time domain for transmitting.
  • the open-loop precoding process may include: layer interleaving and precoding processing; or precoding processing and cyclic delay processing; or layer interleaving, precoding processing, and cyclic delay processing.
  • the open-loop precoding process may further perform precoding processing of using different precoding codewords in units of subcarriers.
  • the apparatus further includes a scrambling module 44, a modulation module 45, a layer mapping module 46, and a transmission precoding processing module 47;
  • the scrambling module 44 is configured to scramble information of each codeword when transmitting information of each codeword on the multi-antenna port;
  • a modulation module 45 configured to modulate the scrambled information
  • a layer mapping module 46 configured to perform layer mapping on the modulated information
  • the transmission precoding processing module 47 is configured to perform precoding processing on the information on each layer after the layer mapping.
  • the transmission performance of the uplink multi-antenna system in the open-loop spatial multiplexing is improved, thereby ensuring the uplink transmission performance of the UE with higher moving speed.

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

Abstract

L'invention concerne un procédé de transmission pour un multiplexage spatial en boucle ouvert avec un système d'antennes montantes multiples, comprenant les étapes suivantes : lorsqu'un équipement d'utilisateur émet les informations de chaque mot de code par un port à antennes multiples, effectuer un traitement de précodage en boucle ouverte des informations qui ont subi un traitement de précodage de transmission ; effectuer un traitement du signal dans le domaine fréquentiel sur les informations qui ont subi un traitement de précodage en boucle ouverte ; et convertir les informations qui ont subi un traitement du signal dans le domaine fréquentiel dans un domaine temporel pour la transmission. L'invention concerne en outre un dispositif de multiplexage spatial en boucle ouverte comprenant un système d'antennes montantes multiples. La présente invention améliore les performances de transmission de l'équipement d'utilisateur avec le système à antennes montantes multiples.
PCT/CN2012/077378 2011-07-13 2012-06-21 Procédé de transmission et dispositif pour le multiplexage spatial en boucle ouverte avec un système d'antennes montantes multiples WO2013007146A1 (fr)

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CN201110195549.7A CN102255691B (zh) 2011-07-13 2011-07-13 一种上行多天线系统开环空间复用的发射方法和装置
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CN102255691B (zh) * 2011-07-13 2018-08-24 中兴通讯股份有限公司 一种上行多天线系统开环空间复用的发射方法和装置
CN102271027B (zh) * 2011-07-21 2018-03-23 中兴通讯股份有限公司 一种上行开环空间复用的预编码处理方法及系统
CN103475445B (zh) * 2012-06-08 2016-11-23 联芯科技有限公司 上行共享信道的信号处理方法及装置
CN104734764B (zh) * 2013-12-24 2020-02-07 锐迪科（重庆）微电子科技有限公司 Lte-a上行处理方法及装置
CN107733482A (zh) * 2016-08-11 2018-02-23 北京信威通信技术股份有限公司 一种上行多天线开环传输的方法及装置

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