WO2012113185A1 - Procédé et appareil pour le prétraitement et l'émission d'un signal d'émission - Google Patents

Procédé et appareil pour le prétraitement et l'émission d'un signal d'émission Download PDF

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Publication number
WO2012113185A1
WO2012113185A1 PCT/CN2011/075435 CN2011075435W WO2012113185A1 WO 2012113185 A1 WO2012113185 A1 WO 2012113185A1 CN 2011075435 W CN2011075435 W CN 2011075435W WO 2012113185 A1 WO2012113185 A1 WO 2012113185A1
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WO
WIPO (PCT)
Prior art keywords
transmitting end
transmitting
phase rotation
rotation matrix
final
Prior art date
Application number
PCT/CN2011/075435
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English (en)
Chinese (zh)
Inventor
宁迪浩
朱登魁
肖华华
鲁照华
Original Assignee
中兴通讯股份有限公司
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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Publication of WO2012113185A1 publication Critical patent/WO2012113185A1/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
    • H04B7/0613—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 simultaneous transmission
    • H04B7/0615—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 simultaneous transmission of weighted versions of same signal
    • H04B7/0619—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 simultaneous transmission of weighted versions of same signal using feedback from receiving side
    • H04B7/0621—Feedback content
    • H04B7/0634—Antenna weights or vector/matrix coefficients

Definitions

  • the present invention belongs to the field of wireless communication technologies, and in particular, to a method and a device for transmitting and transmitting a signal. Background technique
  • Multi-point transmission performs simultaneous co-frequency (cooperative) multi-point transmission through different radio remote units (RRUs), base stations (BS, Base Stations) and their associated relay stations (Relays).
  • RRUs radio remote units
  • BS Base Stations
  • Relays relay stations
  • Technical measures for edge interference improving spectrum efficiency at the cell edge, and increasing effective coverage.
  • Single-site multi-antenna technology or non-multi-point transmission technology can increase the data transmission rate, but it can not significantly improve the performance of the cell edge, and the multi-antenna technology has many working modes such as multiplexing, beamforming and other technologies. Sex is not very good; and through multi-point cooperation, virtual MIMO (Multiple Input Multiple Output) can be constructed, which can increase cell edge performance and is not very demanding on the terminal.
  • MIMO Multiple Input Multiple Output
  • a plurality of neighboring base stations which may be a BS, a relay, a femto base station (femeto) and a plurality of user terminals communicating on the same time-frequency resource, are called multi-point transmission technologies, as shown in FIG. Technologies include cooperative multipoint transmission (Comp) technology and distributed precoding technology (DPS, Distributed Precode Scheme, where coordinated multipoint transmission includes CoBend Beamforming (CB) and Joint Processing (JP, Joint Processing).
  • Comp cooperative multipoint transmission
  • DPS distributed precoding technology
  • each participating base station needs to acquire channel information between each user and all cooperative base stations, and the information transmission amount is very large, and the uplink channel and The interface between base stations is a huge challenge, so in practice, people tend to retreat to the second best data transmission mode, that is, each cooperative base station only obtains all users to their own channel information (so-called local information, Local CSI And then use this information for optimal precoding processing to expect interference avoidance and maximize transmission, which is the idea of distributed precoding.
  • the data received by the user can be expressed as:
  • e C represents the channel coefficient matrix between the first base station and the first user
  • k € D represents the precoding matrix between the first base station and the first user
  • ⁇ ... represents the user's desired signal
  • ⁇ represents the interference between multiple users
  • n fe represents the antenna noise vector
  • the base station side needs to phase rotate the transmitted signal, and thus the formula (1) becomes
  • ⁇ denotes the phase rotation matrix of the i-th base station.
  • H " W " in equation (2) the result of the product of H " W " in equation (2) is a complex number, at which point the rotation matrix ⁇ degenerates to a complex value of unit modulus.
  • the base station side performs phase rotation to enable the receiving side to perform the merging, and the key lies in the rotation matrix, how to obtain the optimal rotation matrix, There are urgent problems to be solved at this stage. Summary of the invention
  • the present invention provides a method and a device for transmitting and transmitting pre-transmission signals, which solves the problem of related merging in the multi-point transmission technology, thereby reducing co-channel interference during system transmission.
  • the present invention provides a method for transmitting and transmitting a signal pre-processing, which is applicable to a wireless communication system including a first transmitting end and a second transmitting end participating in cooperation, and the method includes:
  • the first transmitting end and the second transmitting end respectively calculate the optimal precoding vectors W w and W for the kth user independently according to the kth user downlink channel coefficient matrix Hw and H 2 , fc obtained by measurement or feedback. 2 , fc ;
  • a method for transmitting a pre-processing of a transmitted signal is provided, which is applicable to a wireless communication system including a first transmitting end, a second transmitting end, and a third transmitting end participating in cooperation, the method comprising:
  • the first transmitting end, the second transmitting end, and the third transmitting end respectively calculate, according to the kth user downlink channel coefficient matrix Hw, H 2 , k and H 3 , k obtained by measurement or feedback, respectively, for each of the kth users.
  • the final precoding vector Ww, and the processing weight of the transmission side are multiplied by the original transmission signal by the transmission side processing weight, and multiplied
  • the resulting result is sent as a final transmitted signal through the antenna.
  • the present invention further provides a transmitting signal pre-processing transmitting apparatus, which is applicable to a wireless communication system including a first transmitting end and a second transmitting end participating in cooperation, and the apparatus includes:
  • Precoding vector calculation module for the kth user downlink letter obtained according to measurement or feedback
  • the channel coefficient matrices HW and H 2 calculate respective optimal precoding vectors w w and ⁇ for the kth user independent;
  • a final pre-coding vector calculation module configured to calculate a phase rotation matrix R 2 of the second transmitting end, according to Phase rotation matrix of the second transmitting end? 3 , calculating the final precoding vector of the second transmitting end
  • a data sending module configured to use the transmitting side processing weights to multiply the respective original transmitting signals by using the transmitting side processing weights as the transmitting side processing weights, and use the multiplied result as the final transmitting signal to be sent through the antenna.
  • the present invention further provides a transmitting signal pre-processing transmitting apparatus, which is applicable to a wireless communication system including a first transmitting end, a second transmitting end, and a third transmitting end participating in cooperation, the apparatus comprising: a precoding vector calculating module, configured to Measure or feedback the obtained kth user downlink channel coefficient matrices H lfc , H 2 , fc and H 3 , and calculate respective optimal precoding vectors w w , w 2 ⁇ w k for the kth user;
  • the final pre-coding vector calculation means for calculating a second sending end, the third phase rotation matrix R of the transmission side 2, R 3, respectively, the rotation matrix R according to a second phase the transmitting side, the transmitting side of the third 2, R 3, Calculation
  • the data sending module is configured to use the final precoding vector and the processing weight as the transmitting side,
  • the transmit side processing weight is multiplied by the respective original transmit signal, which will be multiplied
  • the result is sent out through the antenna as the final transmitted signal.
  • the receiving end can effectively coherently combine the signals transmitted by the multiple transmitting ends, thereby effectively utilizing the multi-point transmission technology, reducing the interference of the cell edge, and improving the cell.
  • the edge spectrum efficiency increases the effective coverage of the cell.
  • FIG. 1 is a schematic diagram of a multipoint transmission technique in the prior art
  • the number of cooperative base stations is 2
  • the method includes:
  • the first transmitting end and the second transmitting end respectively calculate optimal precoding for each kth user according to the kth user downlink channel coefficient matrix Hw and H obtained by measurement or feedback.
  • the final precoding vector sum is used as the transmitting side processing weight, and the transmitting side processing weight value is multiplied by the original original transmitting signal, and the multiplied result is sent as the final transmitting signal through the antenna.
  • the base stations participating in the cooperation are the base station 1 and the base station 2, and the number of service users under the two cooperative base stations is K.
  • the base station 1 and the base station 2 respectively obtain the kth user downlink channel coefficient matrices H 13 ⁇ 4 and H 2i according to measurement or feedback, and calculate respective optimal precoding vectors W 13 ⁇ 4 and W 2 for the kth user.
  • the transmission signal of the base station 2 is used to calculate the rotation matrix in one of two ways.
  • the cooperative base station uses the final precoding vector sum obtained by the above calculation to process the transmission signal as the transmission side processing weight, that is, multiply the transmission side processing weight by the respective original transmission signals, and multiply the result obtained as the final transmission.
  • Signal ie
  • ⁇ denotes the signal vector finally transmitted by the base station i to the user k
  • W is the final precoding vector of the i-th base station to the kth user
  • s fc is the original transmitted signal transmitted to the kth user.
  • the number of cooperative base stations is 3
  • the method includes:
  • the first sending end, the second sending end, and the third sending end respectively calculate the kth user downlink channel coefficient matrices H l fc , H 2 , k and H 3 , k obtained by measurement or feedback, respectively k user-independent final precoding vectors W k , W 2rk and W u ;
  • the base stations participating in the cooperation are the base station 1, the base station 2, and the base station 3, and the number of service users under the three cooperative base stations is K.
  • the following steps are used to calculate the rotation matrix required for the three base stations to transmit to the kth user.
  • the base station 1, the base station 2, and the base station 3 respectively obtain the kth user downlink channel coefficient matrices H w , H 2 , fc and H 3 , fc according to measurement or feedback, and calculate respective optimal precodings for the kth user independently.
  • the base station 2, the base station 3's transmit signal ⁇ uses one of the following two methods to calculate the rotation matrix.
  • method 1 :
  • phase rotation factor of the base station 3 is calculated using the following formula
  • H lk , H 2fc and H 3fc represent the downlink channels of the base station 1, the base station 2 and the base station 3 to the user k, respectively.
  • Step 4 The cooperative base station uses the final precoding vector obtained by the above calculation, and processes the transmitted signal as the transmission side processing weight, that is, multiplies the transmission side processing weight by the original original transmission signal, and multiplies the result.
  • the final transmitted signal ie
  • the number of base stations participating in the current cooperation is 2, and there are a total of K users in the current coordinated base station.
  • the base station 1 and the base station 2 respectively obtain the kth user downlink channel information H lk and H 2 k according to measurement or feedback, and calculate respective optimal precoding vectors and W 2 , fc base station 1 for each kth user independent.
  • the base station 2 seeks an optimal rotation angle ⁇ according to the following formula, so that the following formula holds:
  • Distributed precoding is accomplished by multiplying the final precoding vector calculated above by the original transmitted signal.
  • the number of base stations participating in the current cooperation is 2, and the number of users currently working in the set of coordinated base stations is one.
  • the base station 1 and the base station 2 respectively obtain the kth user downlink channel coefficient matrices H lk and H 2k according to measurement or feedback, and calculate respective optimal precoding vectors k and independent for the kth user.
  • H lk and H 2 k represent the downlink channel coefficient matrix of base station 1 and base station 2 to user k, respectively.
  • Distributed precoding is accomplished by multiplying the final precoding vector calculated above by the original transmitted signal.
  • the base stations participating in the cooperation are the base station 1, the base station 2, and the base station 3, and the number of service users under the three cooperative base stations is ⁇ .
  • the base station 1, the base station 2, and the base station 3 respectively obtain the kth user downlink channel coefficient matrices H w , H 2 , fc and H 3 , fc according to measurement or feedback, and calculate respective optimal precodings for the kth user independently.
  • the base station 2 and the base station 3 seek an optimal rotation angle sum from the pre-designed codebook according to the following formula, so that the following formula holds:
  • H lk , H 2fc and H 3fc represent the downlink channel coefficient matrix of the base station 1, the base station 2 and the base station 3 to the user k, respectively.
  • the base stations participating in the cooperation are the base station 1, the base station 2, and the base station 3, and the number of service users under the three cooperative base stations is K.
  • the base station 1, the base station 2, and the base station 3 respectively obtain the kth user downlink channel coefficient matrices H w , H 2 , fc and H 3 , fc according to measurement or feedback, and calculate respective optimal precodings for the kth user independently.
  • H lfc and H 2 , fc represent the downlink channel coefficient matrix of base station 1 and base station 2 to user k, respectively.
  • phase rotation factor of the base station 3 is calculated using the following formula
  • H lk, H 2fc and H 3fc respectively base station 1, base stations 2 and 3 to User k's downlink channel coefficient matrix.
  • Distributed precoding is accomplished by multiplying the final precoding vector calculated above by the original transmitted signal.
  • the present invention also provides a transmitting signal pre-processing transmitting apparatus, which is applicable to a wireless communication system including a first transmitting end and a second transmitting end participating in cooperation, and includes:
  • a precoding vector calculation module configured to calculate respective optimal precoding vectors w w and ⁇ for the kth user independent according to the kth user downlink channel coefficient matrix HW and H ⁇ obtained by measurement or feedback;
  • a final pre-coding vector calculation module configured to calculate a phase rotation matrix R 2 of the second transmitting end, according to Phase rotation matrix of the second transmitting end? 2 , calculating the final precoding vector of the second transmitting end
  • a data sending module configured to use the transmitting side processing weights to multiply the respective original transmitting signals by using the transmitting side processing weights as the transmitting side processing weights, and use the multiplied result as the final transmitting signal to be sent through the antenna.
  • the present invention further provides another transmitting signal pre-processing transmitting apparatus, which is applicable to a wireless communication system including a first transmitting end, a second transmitting end, and a third transmitting end participating in cooperation, including: a precoding vector computing module, Calculating respective optimal precoding vectors w 13 ⁇ 4 , w 2 ⁇ w k for the kth user independently according to the kth user downlink channel coefficient matrices H lfc , H and H ⁇ obtained according to the measurement or feedback;
  • the final pre-coding vector calculation means for calculating a second sending end, the third phase rotation matrix R of the transmission side 2, R 3, respectively, the rotation matrix R according to a second phase the transmitting side, the transmitting side of the third 2, R 3, Calculation
  • a data sending module configured to use the final precoding vector, W 2 , fc and W 3 , fc as the transmitting side processing weight, and multiply the original transmitting signal by the transmitting side processing weight, and multiply the result
  • the final transmitted signal is sent out through the antenna.
  • the transmitting end in the present invention may be a control device such as a base station, a relay station, a radio remote device, or a pico base station in a downlink in a wireless communication system.
  • the user is a data signal for receiving the transmitting end, and the user may be a terminal device in the uplink in the wireless communication system, such as a mobile phone, a notebook computer, a handheld computer, or the like.
  • the method and apparatus of the present invention are applicable to wireless communication systems such as LTE and WIMAX.

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

Abstract

L'invention concerne un procédé et un appareil pour le prétraitement et l'émission d'un signal d'émission. Le procédé comprend : et , qui sont les vecteurs de précodage indépendants et optimaux d'une première borne d'émission et d'une seconde borne d'émission vers le kième utilisateur, sont calculés par la première borne d'émission et la seconde borne d'émission, respectivement, en fonction de matrices de coefficients de canal descendant et du kième utilisateur, obtenus par mesure ou retour d'informations ; la circumrotation de phase n'est pas effectuée pour le signal d'émission de la première borne d'émission, c'est-à-dire que la matrice de circumrotation de phase est R1 = 1 et un vecteur final de précodage de la première borne d'émission est = ; une matrice de circumrotation de phase R2 de la seconde borne d'émission est calculée et un vecteur final de précodage de la seconde borne d'émission est calculé par = en fonction de la matrice de circumrotation de phase R2 de la seconde borne d'émission, étant un facteur de circumrotation de phase ; les vecteurs finaux de précodage et sont utilisés comme valeurs de pondération de traitement des côtés d'émission, afin de multiplier les signaux d'émission originaux respectifs, et les résultats obtenus par la multiplication sont émis par des antennes en tant que signaux d'émission finaux. L'invention réduit les interférences aux limites des cellules et améliore l'efficacité du spectre de fréquences aux limites des cellules.
PCT/CN2011/075435 2011-02-22 2011-06-08 Procédé et appareil pour le prétraitement et l'émission d'un signal d'émission WO2012113185A1 (fr)

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CN201110044238.0 2011-02-22
CN201110044238.0A CN102647247B (zh) 2011-02-22 2011-02-22 一种发射信号预处理发送方法及装置

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CN106789812B (zh) * 2016-12-13 2020-03-27 中山大学 一种基于部分传输序列的ofdm时域信号的量化方法
CN108418612B (zh) 2017-04-26 2019-03-26 华为技术有限公司 一种指示及确定预编码向量的方法和设备
US10623083B2 (en) * 2017-12-11 2020-04-14 RF DSP Inc. Distributed wireless antennas and millimeter wave scanning repeater

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CN101515817A (zh) * 2009-03-17 2009-08-26 中兴通讯股份有限公司 一种多天线发射分集方法及装置
CN101662319A (zh) * 2009-09-23 2010-03-03 东南大学 协作多点系统中基于扰动原理的闭环宏分集方法
WO2010123313A2 (fr) * 2009-04-24 2010-10-28 Samsung Electronics Co., Ltd. Techniques de rétroaction d'information d'état de canal dans un système de communication sans fil
CN101917381A (zh) * 2010-08-20 2010-12-15 西安电子科技大学 协作多点传输系统中小区间延迟差补偿方法

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WO2010123313A2 (fr) * 2009-04-24 2010-10-28 Samsung Electronics Co., Ltd. Techniques de rétroaction d'information d'état de canal dans un système de communication sans fil
CN101662319A (zh) * 2009-09-23 2010-03-03 东南大学 协作多点系统中基于扰动原理的闭环宏分集方法
CN101917381A (zh) * 2010-08-20 2010-12-15 西安电子科技大学 协作多点传输系统中小区间延迟差补偿方法

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CN102647247B (zh) 2015-08-12

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