WO2007102493A1 - Procede d'attribution d'antennes de transmission et procede de separation du signal de reception - Google Patents

Procede d'attribution d'antennes de transmission et procede de separation du signal de reception Download PDF

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Publication number
WO2007102493A1
WO2007102493A1 PCT/JP2007/054298 JP2007054298W WO2007102493A1 WO 2007102493 A1 WO2007102493 A1 WO 2007102493A1 JP 2007054298 W JP2007054298 W JP 2007054298W WO 2007102493 A1 WO2007102493 A1 WO 2007102493A1
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Prior art keywords
cell
antenna
terminal
transmission
antennas
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PCT/JP2007/054298
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English (en)
Japanese (ja)
Inventor
Haitao Li
Jifeng Li
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Matsushita Electric Industrial Co., Ltd.
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Publication of WO2007102493A1 publication Critical patent/WO2007102493A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/16—Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
    • 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
    • H04B7/0686—Hybrid systems, i.e. switching and simultaneous transmission
    • H04B7/0691—Hybrid systems, i.e. switching and simultaneous transmission using subgroups of transmit antennas

Definitions

  • the present invention relates to a transmission antenna allocation method and a reception signal separation method, and more particularly to a transmission antenna allocation method and a reception signal separation method in a radio communication system that uses multi-cells and to which a multi-antenna communication scheme is applied.
  • next-generation wireless communication systems that incorporate new technologies such as MIMO (Multi-Input Mult 0 utput) technology must be developed.
  • MIMO Multi-Input Mult 0 utput
  • a MIMO communication system uses a multi-antenna array on the transmission side and the reception side, thereby making it possible to improve the system capacity and the quality of the radio transmission path.
  • space division multiplexing A typical application of space division multiplexing is the BLAST proposed by Bell Laboratories, which divides the entire data stream into multiple independent substreams and transmits the substreams in parallel via multiple antennas. (Bell Labs Layered Space-Time).
  • Space diversity includes, for example, transmission diversity such as space-time trellis code and space-time block code, and reception diversity, and improves the robustness of the system using multipath transmission between transmission Z and reception antennas.
  • Non-Patent Document 1 3GPP Rl-050590, NTT DoCoMo, Physical channels and multiplexing in evolved UTRA downlink, RANI Ad Hoc on LTE
  • Non-Patent Document 2 3GPP Rl-050591, NTT DoCoMo, Physical channels and multiplexing in evolved UTRA uplink, RANI Ad Hoc on LTE
  • a first object of the present invention is to provide a transmission antenna allocation method for improving system capacity by taking into account interference between cells in a radio communication system that takes multi-cells and to which a multi-antenna communication scheme is applied. That is.
  • the second object is to provide a received signal separation method capable of suitably separating signals transmitted from a plurality of antennas on the transmission side in a wireless communication system that uses multi-cells and to which a multi-antenna communication system is applied. It is to be.
  • the transmission antenna allocation method of the present invention is a transmission antenna allocation method in a wireless communication system having a plurality of cells and to which a multi-antenna communication system is applied, and includes a plurality of transmission antenna allocation methods in a first cell. For each combination of transmission antenna assignments to the terminal, the channel capacity of the first cell is set to the value of the cell other than the first cell of the covariance matrix value of the signal transmitted from the terminal in the first cell.
  • the channel capacity calculating step to calculate, and the transmitting antenna corresponding to the maximum value of the calculated channel capacity
  • a transmission antenna allocation step of allocating transmission antennas to a plurality of terminals in the first cell according to the allocation.
  • the received signal separation method of the present invention is used in a base station of a radio communication system to which a multi-antenna communication method is applied, and signals transmitted from terminals in the cell of the base station are transmitted to each antenna of the terminal.
  • the signal for each terminal is sequentially separated in the direction of force, and in the signal separation for each terminal, when there are a plurality of antennas used in the terminal that is the signal separation target, the received intensity is determined based on the signal corresponding to the antenna.
  • a transmission antenna allocation method for improving system capacity by taking into account interference between cells in a radio communication system that takes multi-cells and to which a multi-antenna communication scheme is applied. Can do. Furthermore, the present invention provides a reception signal separation method capable of suitably separating signals transmitted from a plurality of antennas on the transmission side after assigning a transmission antenna in a wireless communication system employing a multi-cell and adopting a multi-antenna communication system. be able to.
  • FIG. 1 is a system schematic diagram of a Snoreller wireless system as a wireless communication system to which a MIMO communication system according to an embodiment of the present invention is applied.
  • FIG. 3A is a block diagram showing the configuration of the MIMO transmission apparatus of this embodiment
  • FIG. 3B is a block diagram showing the configuration of the MIMO receiving apparatus according to the present embodiment
  • FIG. 4A Diagram for explaining the cell edge and other cell interiors
  • FIG. 4B A diagram for explaining a method for determining whether or not a MIMO transmitter exists in a cell edge portion.
  • FIG. 5 is a flowchart showing the steps of the antenna selection method of the present embodiment.
  • FIG. 9 A diagram showing a system composed of a MIMO transmitting apparatus and a MIMO receiving apparatus which are regarded as one apparatus as shown in FIG.
  • FIG. 10 is a diagram for explaining the principle of the user detection method of the present embodiment.
  • FIG. 11 is a flowchart showing each step of the MIMO multi-user detection method of the present embodiment.
  • FIG. 1 is a system schematic diagram of a radio communication system to which the MIMO communication system of the present embodiment is applied.
  • a system schematic diagram is shown particularly when a cellular radio system is used as a radio communication system.
  • FIG. 2 is a schematic diagram illustrating an example of a multi-cell.
  • a MIMO communication system that is a multi-antenna system is applied to a cellular network.
  • a plurality of antennas are installed on both the base station (BS) side and the user (UE) side, and communication is performed between the user terminal and the base station.
  • multi-cell is applied to the wireless communication system of the present embodiment.
  • Multicells can take the shape of a hexagonal honeycomb. In other words, in the multi-cell, there are six neighboring cells around each cell, and each base station covers one cell.
  • FIG. 3 is a block diagram showing a schematic configuration of a MIMO transmission apparatus and an Ml MO reception apparatus that constitute the radio communication system according to the present embodiment.
  • FIG. 3A shows the configuration on the transmission side
  • FIG. 3B shows the configuration on the reception side.
  • MIMO transmission apparatus 300 includes serial / parallel conversion section 301, encoding / modulation section 302, and transmission antenna selection section 303.
  • the serial-parallel converter 301 forms a plurality of substreams by serial-parallel conversion of a serial input bitstream. Each of the substreams is output to the corresponding code modulation unit 302 of each branch.
  • the number of code modulation units 302 is the same as the number of branches. Each code modulation unit 302 outputs a transmission stream obtained by performing coding processing and modulation processing on the input substream to the transmission antenna selection unit 303.
  • Transmission antenna selection section 303 selects an antenna of its own device to be used for transmission based on "certain conditions", and then transmits a transmission stream using the selected antenna.
  • MIMO reception apparatus 400 includes signal detection section 401 and demodulation / decoding section 402.
  • the signal detection unit 401 separates each transmission stream transmitted from the transmission side included in the reception signal received by the plurality of antennas of the own apparatus.
  • Demodulation / decoding section 402 performs demodulation processing and decoding processing on each stream separated by signal detection section 401, and further performs parallel-serial conversion on the plurality of parallel streams obtained in this way. To form a serial bitstream. This bit stream is output to the functional unit at the subsequent stage.
  • MIMO transmitting apparatus 300 is a user terminal (UE) and MIMO receiving apparatus 400 is a base station (BS) will be described.
  • BS base station
  • an input bit stream is input to the code modulation unit 302 of each branch via the serial / parallel conversion unit 301, and channel code modulation and code modulation are performed. Then, after the transmission antenna selection unit 303 selects the antennas of the input waiting transmission signal based on the “certain condition”, the transmission signal is transmitted to the channel by these antennas.
  • the received signal is input to the signal detection unit 401, and the signal of each antenna branch is separated into signals corresponding to the transmission stream on the transmission side, and these signals are converted into parallel output code streams. And demodulated recovery The bit stream is restored by demodulating and decoding the code stream in the coding unit 402.
  • N antennas are installed in the base station of i), and M antennas are installed in the user terminals in the cell. Further, when the transmission signal of the user terminal is x and the channel gain matrix for the user terminal power base station in cell i, that is, the uplink channel gain matrix is H,
  • X is an interference signal with respect to the cell i of the user terminal in the cell j.
  • H is a channel gain matrix up to the base station side of user terminal power cell i of cell j.
  • ⁇ ⁇ X which is the second term on the right side of Equation (2), is the total interference for cell i from cells other than cell i.
  • n is the noise in cell i.
  • R is the covariance matrix of the target signal in the target cell.
  • R is a covariance matrix of interference from cell other than cell i to cell i.
  • R and R are expressed as follows.
  • H ⁇ means a pseudo inverse of the matrix H.
  • Equation (4) The average capacity of the radio communication system when the OFDM communication scheme is further applied to the radio communication system to which the spatial division multiplexing MIMO communication scheme is applied is expressed as Equation (4).
  • Equation 5 [0028] As is clear from Equations (3) and (4) above, increasing the number of transmission antennas in the target cell can improve the rate of the target cell, but it is the same for other adjacent cells. Channel interference increases, leading to a reduction in system capacity. On the other hand, if the number of transmit antennas in the target cell is reduced, the rate of the target cell is reduced, but co-channel interference with other neighboring cells is reduced, leading to an increase in system capacity. Therefore, it is necessary to optimize the trade-off between each cell rate and system capacity.
  • whether or not to perform antenna selection for MIMO transmitting apparatus 300 is determined based on the following criteria.
  • the cells are classified into cell edge portions and other cell interiors.
  • the MIMO transmission apparatus 300 located inside the cell uses an original multi-antenna structure. That is, inside the cell, there is little interference between the cells received by the user terminal, and the transmission rate is reduced when antenna selection is performed. Therefore, the MIMO transmission apparatus 300 does not perform transmission antenna selection! / ,.
  • a transmission antenna selection technique is used for MIMO transmission apparatus 300 located at the cell edge portion. Selecting a transmit antenna reduces the transmission rate of each user of the spatial division multiplexing MIMO system, but at the same time reduces co-channel interference from that user to neighboring cells, resulting in a cellular system. Capacitance gain can be obtained.
  • the SNR of the pilot signal of the A cell measured by the user terminal in the cell is higher than the threshold value a2, and the SNR of the pilot signal of the B cell is at the threshold value b2, that is, at position 2 (site 2), The cell edge is between positions 1 and 2.
  • the transmission antenna of the user terminal is selected as described above, the user rate is lowered. If the user rate becomes excessively low, normal communication cannot be performed. Therefore, the transmission antenna selection needs to be performed under a certain user rate limiting condition.
  • the number of transmission antennas is linearly proportional to the channel capacity. Therefore, if the transmission antenna is halved, the transmission rate is also halved.
  • the rate limiting condition required for transmission antenna selection is limited to the number of antennas, that is, the condition based on the minimum number of transmission antennas to be used by one user terminal (first condition).
  • the number of antennas selected by the user terminal must be set to be smaller than the number of antennas on the base station side, so the number of base station side antennas is limited to the upper limit. Needed (second condition). Finally, the selected antenna must ensure that the user channel capacity is maximized in each cell (condition 3). Based on these principles (1st to 3rd conditions), the criteria for antenna selection are expressed by the following equation (5).
  • M (m) is the number of antennas selected by user m.
  • M (m) is the lower limit of the number of transmit select 0 antennas for user m.
  • M is the upper limit of the total number of transmit antennas.
  • the channel capacity is calculated using the matrix value of the signal covariance matrix. Simplified antenna selection criteria that can be shifted to the calculation of Eq.
  • M (m) antennas can be selected from M antennas based on the signal covariance matrix and the antenna restriction condition.
  • the target power in the target cell is based on the ratio of the covariance matrix value of the transmitted signal to the covariance matrix value of the interference signal to the target cell transmitted from the terminal of the cell other than the target cell.
  • Equation (6) a solution to the restriction optimization problem of Equation (6) is obtained by an enumeration method.
  • FIG. 5 a case will be described in which antenna selection is performed for a system composed of V, one of the users and the base station.
  • step S501 select all possible antenna combination methods (M, M) based on the total number of transmit antennas of the MIMO communication system and the upper and lower limits of the set number of transmit antennas. To do. (M, M) is selected from M transmit antennas.
  • step S502 the value of the covariance matrix equation, det (I + R / R), is calculated for each selected combination of transmission antennas.
  • step S503 a combination of transmission antennas that maximizes the value of the determinant is selected as the user terminal antenna setting method.
  • one user terminal accesses the wireless communication system, and the user terminal and the base station It is assumed that four antennas are installed on the station side.
  • the lower limit of the user terminal transmit antenna is two. Therefore, there are (2, 4) antenna selection combinations for user terminals.
  • the user terminal is located at the cell edge, and up to the co-channel interference between cells is included in the calculation, and the SNR is 5 dB.
  • the number of antennas that transmit signals decreases.
  • the antenna (Ul #, U12 #, U13 #, U14 #) of user 1 becomes (Ul #, U12 #) after selection.
  • the antenna (U21 #, U22 #) of user 2 becomes (U21 #) after selection.
  • User 3's antenna (U31 #, U32 #) becomes (U32 #) after selection.
  • a new MIMO communication system is formed by the reconstructed transmission side and the original base station reception side. Therefore, the MIMO receiver 400 can perform MIMO multiuser detection using the MIMO detection algorithm.
  • the advantage of MIMO multi-user detection is that transmission information of multiple users can be used simultaneously.
  • MIMO detection for each user regards signals from other users as interference.
  • a reconstructed MIMO communication system ie, a plurality of user terminals
  • a serial interference cancellation method for each user in order to restore the user signal from the base station side.
  • the method is performed based on the following concept. That is, as shown in FIG. 10, first, a user having the maximum average SNR is detected. Since these users' signals are strong, interference with other users is also strong. Therefore, if a user with a strong signal is detected and removed from the received signal, the influence of the user signal on other user signals is reduced. In addition, since the selected user terminal is considered to have one or a plurality of transmission antennas after the antenna selection, the user signal control is performed by simultaneously processing all the transmission antenna signals of the user terminal. Is even easier.
  • VBLAST general serial interference cancellation detection method
  • FIG. 11 is a flowchart showing each step of the MIMO multiuser detection method of the present embodiment.
  • step S111 initialization step
  • the user waiting for detection is set to [1, U]
  • the user terminal power is H
  • step SI 12 initialization step
  • the number of antennas of user u is set to muE [1, M sele u]
  • step SI13 the mod value II (G)
  • the mod value of each row of the matrix corresponds to the inverse value of SNR after detection of different users and different antennas. That is, the smaller the mod value, the higher the SNR after detection. So First, the currently detected user u is determined based on the criterion that the average SNR after detection is maximum for each user terminal.
  • the first user terminal U1 transmits using two antennas, and the other two user terminals (U2, U3) use one antenna. And sending it.
  • the mod values corresponding to each user and each antenna are (
  • step S114 it is determined whether the user terminal u waiting for detection has a plurality of transmission antennas after selection of the transmission antenna.
  • step S 114 If the determination result in step S 114 is that the user terminal u waiting for detection has only one transmission antenna selected, the process proceeds to step S 116. On the other hand, if the determination result of step S114 shows that the user terminal u waiting for detection has a plurality of selected transmission antennas, the process proceeds to step S115.
  • step S115 a channel matrix between the antenna of the user terminal and the base station is selected, and a matrix G is obtained by calculating a pseudo inverse matrix of the matrix. Then, mod values of all rows of the matrix G,
  • n ul, 2 II are compared, and the antenna with the smallest m od value is determined as the first detection waiting antenna.
  • step SI16 a row vector in the G matrix corresponding to the antenna awaiting detection m is taken, and the vector is set as a zero vector W.
  • step S118 the received signal is updated. That is, the restored signal on the antenna m side of the user terminal u is removed from the received signal by the following equation.
  • Equation 8 y-( H ) OTu
  • (H) is the channel fading coefficient vector of the m-th antenna of user terminal u.
  • step S119 G is updated. That is, the matrix tilde (H) is obtained by deleting the row corresponding to the antenna m from the H matrix (that is, making the row zero). Then, tilde (G) is obtained by calculating a pseudo inverse matrix of the matrix tilde (H). That is, the following equation is calculated.
  • step S115 If select su is established, the process proceeds to step S115. On the other hand, if it does not hold, elect
  • step S1113 cu and U are compared. As a result of the comparison, if cu ⁇ U is satisfied, the process proceeds to step S112. On the other hand, if not established, the process is terminated.
  • the transmission antenna is not selected inside the cell, thereby ensuring the transmission rate and using the transmission antenna selection technique at the cell edge.
  • the selection of the transmission antenna reduces the transmission rate of each user, but at the same time, the co-channel interference to the adjacent cell by that user can be reduced, so that the cellular system capacity gain can be obtained.
  • the user terminal selects a transmission antenna
  • the user rate is reduced. If the user rate becomes excessively low, normal communication cannot be performed. Therefore, transmission antenna selection needs to be performed under certain user rate limiting conditions. Therefore, in the transmit antenna selection method proposed in this embodiment, in principle, the user's channel capacity per cell is maximized under the condition that the number of antennas after antenna selection satisfies the desired minimum transmission rate.
  • the channel capacity is converted as the value of the determinant of the signal covariance matrix. That is, the antenna is selected based on the signal covariance matrix and the antenna restriction condition. Then, the above limit optimization problem is obtained by enumeration.
  • a plurality of terminals in the first cell (target cell).
  • the channel capacity of the first cell is set to the terminal capacity of a cell other than the first cell of the covariance matrix value of the signal transmitted from the terminal in the first cell.
  • the covariance matrix value of the signal transmitted by the terminal power in the target cell is compared with the covariance matrix value of the interference signal to the target cell transmitted from the terminal card of the cell other than the target cell. Since the channel capacity of the target cell is calculated based on the ratio, the channel capacity reflecting the influence of interference from cells other than the cell can be obtained. As a result, the system capacity can be improved by considering the interference between cells.
  • the transmission antenna allocation method further includes a determination step of determining whether a location of a terminal in the first cell is a cell edge portion, wherein the channel capacity calculation step includes the first The combination of antennas used in a terminal at the cell edge portion, wherein the combination is such that the upper limit is the number of antennas of the base station in the cell and the lower limit is the number of antennas that satisfy the transmission rate requirement for one terminal.
  • the channel capacity of the first cell is calculated for a combination that limits the above-mentioned selection antenna to a part of the antenna provided in the terminal.
  • a signal transmitted from a terminal within a cell of the base station is transmitted to the terminal.
  • This is a received signal separation method that separates signals corresponding to each terminal antenna, and specifies the order of terminals based on the average received strength (for example, average SNR) for the antenna used by each terminal based on the channel matrix.
  • the signals for each terminal are sequentially separated in descending order of the average reception strength, and in the signal separation for each terminal, the reception strength is high when there are a plurality of antennas used in the signal separation target terminal.
  • a signal separation step for sequentially separating the signal corresponding to the antenna, and the received signal separation method (the above-described user detection method).
  • the antenna power used by the terminal having a large average reception strength that can be a large interference with other terminals The transmitted signal power is sequentially separated, so that the signal separation is performed while removing the influence of the interference between the terminals. It can be performed.
  • the received signal strength that can cause large interference with other antennas! / The antenna power used, and the transmitted signal power are separated in order to eliminate the effects of interference between antennas. Signal separation can be performed.
  • a reception signal separation method that can suitably separate signals transmitted from a plurality of antennas on the transmission side. Needless to say, as described above, this received signal separation method can also suitably separate the signal transmitted from the terminal after performing the transmission antenna assignment by the transmission antenna assignment method.
  • One aspect of the present invention is a transmission antenna selection method for suppressing inter-cell / intra-cell interference in a multi-user multi-antenna system, the step of determining whether or not a user terminal is located at a cell edge; When the user terminal is located at the cell edge, the transmission antenna of the user terminal is set so that the user channel capacity of the cell is maximized based on a certain rate limiting condition and the number of antennas on the base station side. And a step to select.
  • the number of antennas for signal transmission is reduced by the antenna selection of the user terminal. If the total number of antennas of all user terminals is less than the number of antennas on the base station side, multi-user detection can be performed on the base station side. In that case, assuming that all user terminals after antenna selection are regarded as one multi-antenna transmission side and a new V ⁇ MIMO communication system is constructed on the transmission side and the base station reception side, MIMO multi-user detection is implemented. it can It will be.
  • another aspect of the present invention is a signal restoration method for performing serial interference cancellation for each user, in which the number of base station antennas is the number of user terminal antennas in each cell in the system.
  • an antenna selection step for selecting that antenna as a detection awaiting antenna and a detection awaiting antenna corresponds to an antenna selection step for selecting that antenna as a detection awaiting antenna and a detection awaiting antenna.
  • An update step that deletes the row corresponding to the antenna waiting for detection and updates the channel matrix, and whether or not signal restoration has been performed for all transmission antennas of the currently detected user terminal are determined. If NO, return to the antenna selection step, determine the antenna determination step for selecting the next antenna to be detected, and whether or not signal restoration has been performed for all user terminals. If NO, the process returns to the user terminal selection step. If the determination result is YES, the user terminal judgment that signal restoration for all user terminals has been completed. And the step, the to Yes.
  • a third mode combining the above first and second modes is a multi-user multi-antenna system in which the number of antennas of the base station is equal to or greater than the total number of antennas of the user terminals in each cell of the system.
  • a multi-user multi-antenna uplink transmission / reception processing method for suppressing inter-cell / intra-cell interference in which a user terminal performs transmission antenna selection using the transmission antenna selection method described in the first aspect! ⁇ ⁇ ⁇ ⁇
  • the transmission antenna allocation method and the reception signal separation method of the present invention improve the system capacity by taking into account interference between cells in a wireless communication system that uses multi-cells and to which a multi-antenna communication method is applied. This is useful as a transmission antenna allocation method for performing transmission antennas and a reception signal separation method capable of suitably separating signals transmitted from a plurality of antenna forces on the transmission side after transmission antenna allocation.

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Abstract

La présente invention concerne un procédé d'attribution d'antennes de transmission dans un système de communication sans fil à cellules multiples auquel un système de communication à antennes multiples est appliqué. Ce procédé est doté de caractéristiques dans lesquelles les interférences entre les cellules sont prises en considération pour améliorer la capacité du système. Le procédé d'attribution d'antennes de transmission appliqué au système de communication sans fil à cellules multiples est composé d'une étape de calcul de la capacité du canal destinée à calculer une capacité de canal d'une première cellule en fonction d'un rapport d'une valeur de matrice de covariance d'un signal transmis à partir d'un dispositif terminal dans une première cellule sur celle du signal d'interférence vers la première cellule à partir d'un dispositif terminal d'autres cellules que la première cellule que chaque combinaison des antennes de transmission a attribué à une pluralité des dispositifs terminaux dans la première cellule (cellule cible). Le procédé comprend également une étape d'attribution d'antennes de transmission servant à attribuer les antennes de transmission à la pluralité de cellules dans la première cellule conformément à l'antenne de transmission attribuée correspondant à la valeur maximum de la capacité calculée.
PCT/JP2007/054298 2006-03-06 2007-03-06 Procede d'attribution d'antennes de transmission et procede de separation du signal de reception WO2007102493A1 (fr)

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CN101562505B (zh) * 2009-05-19 2011-09-14 华中科技大学 一种多输入多输出系统的多用户调度方法
ES2499217T3 (es) 2010-06-21 2014-09-29 Telefonaktiebolaget Lm Ericsson (Publ) Procedimiento y disposición para señalización de parámetros en una red inalámbrica
US8873683B2 (en) * 2012-12-07 2014-10-28 Intel Mobile Communications GmbH Interference and noise estimation in a multiple input multiple output (MIMO) receiver

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