WO2012129937A1 - Procédé et système de prétraitement distribué pour une transmission en liaison descendante multi-station de base multi-utilisateur - Google Patents

Procédé et système de prétraitement distribué pour une transmission en liaison descendante multi-station de base multi-utilisateur Download PDF

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Publication number
WO2012129937A1
WO2012129937A1 PCT/CN2011/084208 CN2011084208W WO2012129937A1 WO 2012129937 A1 WO2012129937 A1 WO 2012129937A1 CN 2011084208 W CN2011084208 W CN 2011084208W WO 2012129937 A1 WO2012129937 A1 WO 2012129937A1
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Prior art keywords
information
precoding
base station
terminal
measurement signal
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PCT/CN2011/084208
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English (en)
Chinese (zh)
Inventor
焦晓晓
朱登魁
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中兴通讯股份有限公司
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Publication of WO2012129937A1 publication Critical patent/WO2012129937A1/fr

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    • 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
    • H04B7/022—Site diversity; Macro-diversity
    • H04B7/024—Co-operative use of antennas of several sites, e.g. in co-ordinated multipoint or co-operative multiple-input multiple-output [MIMO] systems
    • 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
    • H04B7/0413—MIMO systems
    • H04B7/0417—Feedback systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
    • H04L25/03891—Spatial equalizers
    • H04L25/03898—Spatial equalizers codebook-based design
    • H04L25/03904—Spatial equalizers codebook-based design cooperative design, e.g. exchanging of codebook information between base stations
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0032—Distributed allocation, i.e. involving a plurality of allocating devices, each making partial allocation
    • H04L5/0035—Resource allocation in a cooperative multipoint environment

Definitions

  • the present invention belongs to the field of wireless communication technologies, and in particular, to a distributed preprocessing method and system for multi-base station multi-user downlink transmission. Background technique
  • MIMO Multiple Input Multiple Output
  • SU-MIMO single-user MIMO
  • MU-MIMO multi-user MIMO
  • the SU-MIMO corresponds to a time-frequency resource of the base station and the user terminal, and the base station communicates with a single user terminal on a specific time-frequency resource through multiple antennas.
  • SU-MIMO single-user MIMO
  • MU-MIMO multi-user MIMO
  • the SU-MIMO corresponds to a time-frequency resource of the base station and the user terminal, and the base station communicates with a single user terminal on a specific time-frequency resource through multiple antennas.
  • MU-MIMO as the number of users increases, the base station simultaneously communicates with multiple different user terminals on the same time-frequency resource through multiple antennas, which can simultaneously improve the communication capability between the base station and multiple users.
  • the base station uses only its own antenna to communicate with a single or multiple users.
  • the MIMO communication of the user can be reasonably considered by the base station of the current cell and other base stations with good communication quality, the communication capability of the user must be improved compared to the single base station service,
  • This multi-base station distributed MU-MIMO has received widespread attention at present. Specifically, the multi-base station distributed MU-MIMO uses multiple neighboring base stations to communicate with multiple user terminals on the same time-frequency resource.
  • MIMO precoding is required before the data is transmitted from the antenna.
  • the precoding technique is designed to preprocess the transmitted signal by using Channel-Aide Information at the Transmitter (CSIT).
  • CSIT Channel-Aide Information at the Transmitter
  • the signal beam points to the "direction" that is most beneficial to the user's reception, thereby achieving interference suppression to improve the user's received signal-to-noise ratio.
  • PMI Precoding Matrix Indicator
  • an aspect of the present invention provides a distributed preprocessing method for multi-base station multi-user downlink transmission, including:
  • Each participating control station sends measurement signals to K terminals, K is greater than or equal to 1; each terminal receives measurement signal generation measurement signal feedback information from the control station and sends it to each participating control station;
  • Each participating control station receives measurement signal feedback information from the terminal, calculates a precoding matrix, and generates precoding information to be transmitted to each terminal;
  • Each terminal receives precoding information from each control station, and adjusts the precoding information, and feeds the adjusted precoding information to each control station;
  • Each control station determines the precoding matrix again according to the adjusted precoding information fed back by the terminal, and the downlink signal is processed by the precoding matrix and then sent to the terminal to implement downlink data transmission from the base station to the terminal.
  • Another aspect of the present invention provides a distributed pre-processing system for multi-base station multi-user downlink transmission, including a plurality of control stations and K terminals participating in the cooperation, where K is greater than or equal to 1, and further includes:
  • a measurement signal sending module configured to implement each of the participating control stations to send measurement signals to K terminals, where K is greater than or equal to 1;
  • a measurement signal feedback information generating and transmitting module configured to receive a measurement signal from the control station, generate measurement signal feedback information, and separately send to each control station participating in the cooperation;
  • a precoding matrix calculation and precoding information generating module configured to receive measurement signal feedback information from the terminal, calculate a precoding matrix, and generate precoding information to be sent to each terminal;
  • a precoding information adjustment and feedback module configured to receive precoding information from each control station, and adjust precoding information, and feed the adjusted precoding information to each control station;
  • the precoding matrix determining module is configured to determine the precoding matrix again, so that the downlink signal is processed by the precoding matrix and then sent to the terminal to implement downlink base station to terminal user data transmission.
  • the present invention adopts the distributed precoding technology, does not require information exchange between base stations, improves the gain of the user of the cell, and suppresses interference to neighboring cell users, and expands the distribution of multiple base stations to a certain extent.
  • the communication capabilities of users in MU-MIMO improve the performance of the entire network.
  • FIG. 1 is a schematic diagram of an application scenario of a wireless communication network according to an embodiment of the present invention
  • FIG. 3 is a flow chart of a preferred embodiment of the present invention when it relates to a data stream
  • Each control station participating in cooperation sends a measurement signal to K terminals, K is greater than or equal to 1; each terminal receives measurement signal from the control station to generate measurement signal feedback information is sent to each a control station participating in the cooperation; each participating control station receives measurement signal feedback information from the terminal, calculates a precoding matrix and generates precoding information to be transmitted to each terminal; each terminal receives precoding information from each control station, And precoding the precoding information, and feeding back the adjusted precoding information to each control station; each control station determines the precoding matrix again according to the adjusted precoding information fed back by the terminal, and the downlink signal passes through the precoding matrix. After processing, it is sent to the terminal to implement user data transmission from the downlink base station to the terminal.
  • FIG. 1 is a schematic diagram of a wireless communication network application scenario using a multi-base station distributed MU-MIMO precoding technique according to an embodiment of the present invention.
  • Step 1 The base station sends a measurement signal to the user terminal.
  • each base station separately sends a measurement signal to the user terminals, where the measurement signal includes auxiliary information for determining channel related information of the base station to the user terminal, and the auxiliary information of the channel related information may be according to the measurement signal.
  • Reference information such as RS, reference signal
  • pilot etc.
  • channel coefficient matrix H obtained by channel estimation.
  • Step 2 The user terminal receives the measurement signal from the base station, and generates measurement signal feedback information, which are respectively sent to each base station; Specifically, the first user terminal receives measurement signals from all base stations to the user terminal, and determines, according to the auxiliary determination information (which may be reference information, such as RS) in the measurement signal, each base station to the first user respectively.
  • auxiliary determination information which may be reference information, such as RS
  • the user terminal generates corresponding measurement signal feedback information according to the downlink channel information according to the downlink channel information of each base station to the user terminal, and feeds back to each base station.
  • the measurement signal feedback information mainly refers to PMI (Precoding Matrix Indication/Index) information or PMI (Preferred Matrix Indication/Index) that is most closely matched to the channel information reported by the user terminal. , referred to as PMI information.
  • Step 3 Each base station receives feedback information from the user terminal, initially determines a precoding matrix, and generates precoding information to send to the user terminal.
  • each base station receives feedback information from each user terminal, and each base station uses the PMI information fed back by the paired MU-MIMO user to calculate a precoding matrix corresponding to each user, and obtain corresponding precoding information, and The information is notified to each user terminal, and the precoding information generally refers to precoding matrix indication (PMI) information corresponding to the precoding matrix.
  • PMI precoding matrix indication
  • the paired MU-MIMO user refers to a user scheduled on the same time-frequency resource, and the base station coordinates the downlink precoding matrix of the user terminal by pairing the PMI fed back by the MU-MIMO user to achieve suppression of co-channel interference.
  • the base station may notify the user terminal of the precoding information by using a downlink control channel or a broadcast channel or a data traffic channel;
  • the precoding information may be a precoding matrix obtained by the base station after the calculation; wherein the precoding information may be when the precoding matrix is quantized into a codeword in a system preset codeword set, the codeword The corresponding index value.
  • Step 4 Each user terminal receives precoding information from each base station, and adjusts the precoding information, and then re-feeds the adjusted precoding information to each base station;
  • the user terminal receives downlink precoding information of each user to the user, and the N base stations in the communication network transmit the same signal.
  • the data received by the user may be expressed as:
  • H denotes the channel coefficient matrix between the first base station and the first user, indicating the precoding matrix between the i-th base station and the first user
  • the base station When the base station accurately obtains the channel coefficient H ik , in order to avoid the multi-base station to the user terminal signals cancel each other, thereby obtaining the combining gain brought by the multiple base stations, the coherence combining needs to be achieved, that is, the H ⁇ i ⁇
  • Each column vector of the precoding matrix ⁇ is phase adjusted.
  • Solution ⁇ When the number of data streams is 1, the precoding matrix is a matrix of Mxl, that is, a precoding vector, and only these pre-codings are needed.
  • Scheme B When the number of data streams is >1, the precoding matrix is a matrix of Mx, and each phase corresponding to the precoding matrix (the column vector of the precoding matrix) needs to be phase-adjusted, and the obtained new H ⁇ U is made.
  • the corresponding data stream has the same phase, where ⁇ / ⁇ ( ,..., is the moment
  • Mode b Neither takes the unit matrix I, that is, does not reference the phase of each column vector of any H i ⁇ , but gives a reference phase for the corresponding column vector of each matrix, that is, all ⁇ ⁇ needs to be adjusted. Finally, all ⁇ ⁇ ⁇ ⁇ ⁇ 'J are the same. There are two options for adjusting the base station based on user feedback:
  • Manner 1 The user terminal feeds back the adjustment angle of each column of each precoding matrix to each corresponding base station;
  • Method 2 Generate PMI information according to the adjusted precoding matrices, and feed back the PMI information to the corresponding base stations.
  • Step 5 Each base station determines a precoding matrix according to the adjusted precoding information fed back by the user, and the downlink signal is processed by the precoding matrix and then sent to the user terminal to implement downlink data communication.
  • the specific embodiment is further used in the following. The method of the invention is illustrated.
  • the following embodiments 1-2 are used to illustrate the case where two base stations have two users, wherein the downlink data stream is one distributed precoding.
  • the downlink data stream is one distributed precoding.
  • FIG. 1 there are two base stations BS1 and BS2 in the network structure, and two user terminals MS1 and MS2. Taking the user terminal MS1 as an example, the two base stations BS1 and BS2 are jointly served for two users MS1 and MS2, and the process of downlink communication is implemented by distributed precoding.
  • the base station BS1 and the base station BS2 send measurement signals to the user MS1 and the user MS2. Then, the MS1 determines the downlink channel information H u of the BS1 to the MS1 by receiving the measurement signal of the BS1, and calculates the downlink of the BS1 to the MS1 according to the channel information. a precoding vector ⁇ of the path, and then generating precoding information PM/u according to the precoding vector to the base station BS1;
  • the MS1 determines the downlink channel information H 21 of the BS2 to the MS1 through the received measurement signal of the BS2, and calculates a precoding vector 21 of the BS2 to the MSI downlink according to the channel information, and generates precoding information PM according to the precoding vector. / 21 feedback to the base station BS2;
  • the user terminal MS2 feeds back the precoding information PM/ 12 to the base station BS1, and the user terminal MS2 feeds back the precoding information PM/ 22 to the base station BS2.
  • the base station BS1 feeds back the PM/u of the BS1 and the user MS2 fed back to the PM/ 12 of the BS1, coordinates the PMI to suppress the co-channel interference, and determines their optimal precoding vectors, respectively, and obtains the coordinated
  • the new PM/u is sent to MS1 and the new PM/ 12 is sent to MS2.
  • BS2 sends the corresponding coordinated PMI to MS1 and MS2.
  • Embodiment 1 It is used to describe the case where two base stations and two users downlink transmit one data stream, and the distributed precoding of mode a and mode 1 is adopted.
  • a two-base station is used as an example to transmit a data stream, which illustrates the process of implementing downlink data transmission by using mode 1 and mode a distributed precoding.
  • the user terminal MS1 receives the precoding information from the base stations BS1, BS2, and the corresponding new precoding vector is ⁇ and the precoding vector of BS2 to MS1 is W 21 .
  • the feedback content can adopt mode 1, that is, the user terminal only needs to feed back the adjustment angle of the base station BS2 to the base station BS2.
  • Each base station determines a precoding matrix according to the adjusted precoding information fed back by the user, and the downlink signal is processed by the precoding matrix and then sent to the user terminal to implement downlink data communication.
  • Embodiment 2 It is used to describe the case where two base stations and two users downlink transmit one data stream, and the distributed precoding of mode b and mode 2 is adopted.
  • a data flow is transmitted by using two users of the two base stations as an example to illustrate the process of implementing downlink data transmission by adopting mode 2 and mode b distributed precoding.
  • the user terminal MS1 receives the precoding information from the base stations BS1, BS2, and the corresponding new precoding vector is ⁇ and the precoding vector of BS2 to MS1 is W 21 .
  • the precoding vector can be adjusted by using mode b, that is, ⁇ ⁇ , satisfy: H u u' and H 21 21 ' ⁇ ⁇ ; Standing.
  • the feedback content may adopt mode 2, that is, the user terminal generates new PMI information according to ⁇ ', and feeds back to the base station BS1, and the BS1 determines that the precoding vector is ⁇ ' according to the PMI information fed back by the new MS1; the user terminal generates a new PMI according to ⁇ ' The information is fed back to the base station BS2.
  • BS2 determines that the precoding vector is 21 ' according to the PMI information fed back by the new MS1.
  • Each base station determines a precoding matrix according to the adjusted precoding information fed back by the user, and the downlink signal is processed by the precoding matrix and then sent to the user terminal to implement downlink data communication.
  • the following embodiments 3-4 are used to describe three base stations and three users, where the downlink data stream is one. The case of cloth precoding.
  • BS1, BS2 and BS3 there are three base stations BS1, BS2 and BS3 and three user terminals MS1, MS2 and MS3 in the network structure.
  • BS1, BS2, and BS3 jointly serve MSI, MS2, and MS3, and implements downlink communication through distributed precoding.
  • the base stations BS1, BS2, and BS3 transmit measurement signals to the user MS1, the user MS2, and the user MS3.
  • the MS1 determines the downlink channel information H u of the BS1 to the MS1 by receiving the measurement signal of the BS1, and calculates a precoding vector of the downlink of the BS1 to the MS1 according to the channel information, and generates precoding information according to the precoding vector. PM/u feedback to the base station BS1;
  • MS1 received by BS2, BS3, BS2 to MS1 determines the downlink channel information of the channel H 21, downlink channel information MSI to BS3 H 31.
  • the BS2 to MS1 downlink precoding vector 21 is then calculated based on the channel information, and then the BS3 to MS1 downlink precoding vector is calculated based on the channel information. Then, according to the precoding vector, the precoding information W/ 21 is fed back to the base station BS2, and 31 is fed back to the base station BS3;
  • the user terminal MS2 feeds back the precoding information PM/ 12 to the base station BS1, the feedback precoding information PM/ 22 to the base station BS2, and the feedback precoding information PM/ 32 to the base station BS3; the user terminal MS3 feeds back the precoding information.
  • the PMI is to the base station BS1, the user terminal MS3 feeds back the precoding information PM/ 23 to the base station BS3, and the user terminal MS3 feeds back the precoding information PM/ 33 to the base station BS3.
  • the base station BS1 feeds back to the PMI U and the user MS2 fed back to the BS1 according to the user MS1.
  • the PMI l2 of the BS1 and the user MS3 feed back to the ⁇ of the BS1, coordinate the PMI to suppress the co-channel interference, and determine their optimal precoding vectors respectively, and send the coordinated new ⁇ / consult to the MS1 and the new PMI l2 to MS2, new ⁇ is sent to MS3.
  • BS2, BS3 send the corresponding ⁇ to MS1 and MS2, MS3.
  • Embodiment 3 It is used to describe the case where the three base station three-user downlink transmission data stream is a distributed pre-coding method using mode b and mode 1.
  • a three-base station and three users are taken as an example to transmit a data stream, which illustrates a process of implementing downlink data transmission by using mode b and mode 1 distributed precoding.
  • the user terminal MS1 receives the precoding information from the base stations BS1, BS2 and BS3, and the corresponding new precoding vectors are i, W 2L and 31 , respectively.
  • ⁇ 5 satisfy: H N W N , H 2L W 2l e M and H 3 , 31 ' have the same phase. After the adjustment of the user terminal is completed, it needs to be fed back to the base station again.
  • Mode 1 can be adopted, that is, the user terminal feeds back the adjustment angle of the base station BS2 to the base station BS2 and the adjustment angle of the base station BS3 to the base station BS3.
  • Each base station determines a precoding matrix according to the adjusted precoding information fed back by the user, and the downlink signal is processed by the precoding matrix and then sent to the user terminal to implement downlink data communication.
  • Embodiment 4 It is used to describe the case where the three base station three-user downlink transmission data stream is a distributed pre-coding method using modes a and 2.
  • a three-base station and three users are taken as an example to transmit a data flow, which illustrates a process of implementing downlink data transmission by using mode 2 and mode a distributed pre-coding.
  • the user terminal MS1 receives the precoding information from the base stations BS1, BS2 and BS3, and the corresponding new precoding vectors are i, W 2L and 31 , respectively.
  • Mode 2 that is, the user terminal generates new PMI information according to ⁇ ', and feeds back to the base station BS1, and the BS1 determines that the precoding vector is ⁇ ' according to the PMI information fed back by the new MS1; the user terminal generates a new one according to 21 ', ⁇ '
  • the PMI information is fed back to the base stations BS2, BS3, respectively.
  • BS2 and BS3 respectively determine that the precoding vector is 21 ', 31 ' according to the new PMI information fed back by the MSI.
  • Each base station determines a precoding matrix according to the adjusted precoding information fed back by the user, and the downlink signal is processed by the precoding matrix and then sent to the user terminal to implement downlink data communication.
  • MS2 Taking the user terminal MSI as an example, it describes that BS1, BS2, and BS3 jointly serve MS1, MS2, and MS3, and implements downlink communication through distributed precoding.
  • the base stations BS1, BS2 and BS3 transmit measurement signals to the users MS1, MS2 and MS3.
  • the MS1 determines the downlink channel information Hu of the BS1 to the MS1 by receiving the measurement signal of the BS1, and calculates a precoding matrix of the downlink of the BS1 to the MS1 according to the channel information, and generates precoding information PM according to the precoding matrix. /u feedback to the base station BS1;
  • the MS1 determines the downlink channel information H 21 , BS3 of the BS2 to the MSI, and the downlink channel information H 31 of the MSI through the received BS2 and BS3.
  • the BS2 to MS1 downlink precoding matrix 21 is then calculated based on the channel information, and then the BS3 to MS1 downlink precoding matrix 31 is calculated based on the channel information.
  • BS2, 31 is fed back to the base station BS3; after the same process as the above MS1, the user terminal MS2 feeds back the precoding information PM/ 12 to the base station BS1, the feedback precoding information PM/ 22 to the base station BS2, and the feedback precoding information PM/ 32 to the base station.
  • the base station BS1 feeds back to the PMI U of the BS1 and the user MS2 fed back to the PM/ 12 of the BS1 according to the user MSI, coordinates the PMI to suppress the co-channel interference, thereby respectively determining their optimal precoding matrix, and will obtain new cooperation through coordination.
  • the PMIu is sent to the MS 1, and the new PMI U is sent to the MS2.
  • BS2 and BS3 send corresponding new PMIs to MS1 and MS2.
  • Embodiment 5 It is used to describe the case where two users of three base stations transmit two data streams in the downlink, and adopt the distributed precoding of mode a and mode 1.
  • the two users of the three base stations are taken as an example to describe the process of transmitting the downlink data transmission by using the distributed precoding of the two data streams by using mode b and mode 1.
  • the user terminal MS1 receives the precoding information from the base stations BS1, BS2 and BS3, and since the data of the two streams is transmitted, the precoding matrix is not a vector.
  • the corresponding new precoding matrices are u, 21 and 31 respectively .
  • Mode 1 that is, the user terminal adjusts the angle of the corresponding data stream of the base station BS2, quantizes the feedback to the base station BS2, adjusts the corresponding data stream of the base station BS3, and quantizes the signal to the base station BS3.
  • Each base station determines a precoding matrix according to the adjusted precoding information fed back by the user, and the downlink signal is processed by the precoding matrix and then sent to the user terminal to implement downlink data communication.
  • Embodiment 6 It is used to describe two users of three base stations, two data streams are downlinked, and the distributed precoding of mode b and mode 2 is adopted. Please refer to Figure 1 and Figure 4.
  • the two users of the three base stations are taken as an example to describe the process of transmitting the downlink data transmission by using the distributed precoding of the two data streams by using mode a and mode 2.
  • the user terminal MS1 receives the precoding information from the base stations BS1, BS2 and BS3, and since the data of the two streams is transmitted, the precoding matrix is not a vector.
  • the corresponding new precoding matrices are u, 21 and 31 respectively .
  • Mode 2 that is, the user terminal generates new ⁇ information according to ⁇ ', and feeds back to the base station BS1, and the BS1 calculates the precoding matrix according to the ⁇ information fed back by the new MS1; the user terminal generates a new according to 21 ', ff 31 '
  • the PMI information is fed back to the base stations BS2, BS3, respectively.
  • BS2 and BS3 respectively calculate the corresponding precoding matrix according to the PMI information fed back by the MSI, that is, 21 ', W 3l '.
  • Each base station determines a precoding matrix according to the adjusted precoding information fed back by the user, and the downlink signal is processed by the precoding matrix and then sent to the user terminal to implement downlink data communication.
  • the distributed pre-processing system for multi-base station multi-user downlink transmission of the present invention includes a plurality of control stations and K terminals participating in cooperation, wherein K is greater than or equal to 1, and further includes: a measurement signal sending module, configured to implement each Control stations participating in the collaboration send measurement signals to K terminals, ⁇ greater than or equal to 1;
  • a measurement signal feedback information generating and transmitting module configured to receive a measurement signal from the control station, generate measurement signal feedback information, and separately send to each control station participating in the cooperation;
  • a precoding matrix calculation and precoding information generating module configured to receive measurement signal feedback information from the terminal, calculate a precoding matrix, and generate precoding information to be sent to each terminal;
  • a precoding information adjustment and feedback module configured to receive precoding information from each control station, and adjust precoding information, and feed the adjusted precoding information to each control station;
  • the precoding matrix determining module is configured to determine the precoding matrix again, so that the downlink signal is processed by the precoding matrix and then sent to the terminal to implement downlink base station to terminal user data transmission.

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  • Computer Networks & Wireless Communication (AREA)
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Abstract

La présente invention porte sur un procédé de prétraitement distribué pour une transmission en liaison descendante multi-station de base multi-utilisateur, consistant en ce que : chaque station de commande participant à la coordination transmet un signal de mesure à un nombre K de terminaux, où K est égal ou supérieur à 1; chaque terminal reçoit le signal de mesure à partir de la station de commande, génère des informations de rétroaction de signal de mesure et envoie les informations de rétroaction à chaque station de commande participant respectivement à la coordination; chaque station de commande participant à la coordination reçoit les informations de rétroaction de signal de mesure à partir du terminal, calcule une matrice de précodage et génère des informations de précodage et envoie les informations de précodage à chaque terminal; chaque terminal reçoit les informations de précodage provenant de chaque station de commande, règle les informations de précodage et renvoie les informations de précodage réglées à chaque station de commande; chaque station de commande détermine à nouveau la matrice de précodage en fonction des informations de précodage réglées renvoyées par le terminal, et les signaux en liaison descendante, après avoir été traités par la matrice de précodage, sont envoyés au terminal, ce qui permet de mettre en œuvre une transmission de données d'utilisateur à partir de la station de base en liaison descendante vers le terminal. La présente invention améliore les performances de l'ensemble du réseau.
PCT/CN2011/084208 2011-03-28 2011-12-19 Procédé et système de prétraitement distribué pour une transmission en liaison descendante multi-station de base multi-utilisateur WO2012129937A1 (fr)

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CN201110075187.8 2011-03-28
CN201110075187.8A CN102710388B (zh) 2011-03-28 2011-03-28 一种多基站多用户下行传输的分布式预处理方法和系统

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