WO2011074818A2 - Procédé de transmission d'un signal au moyen d'un système à antennes réparties - Google Patents

Procédé de transmission d'un signal au moyen d'un système à antennes réparties Download PDF

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Publication number
WO2011074818A2
WO2011074818A2 PCT/KR2010/008693 KR2010008693W WO2011074818A2 WO 2011074818 A2 WO2011074818 A2 WO 2011074818A2 KR 2010008693 W KR2010008693 W KR 2010008693W WO 2011074818 A2 WO2011074818 A2 WO 2011074818A2
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Prior art keywords
information
das
antennas
terminal
base station
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PCT/KR2010/008693
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English (en)
Korean (ko)
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WO2011074818A3 (fr
Inventor
강지원
이욱봉
임빈철
천진영
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엘지전자 주식회사
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Priority claimed from KR1020100015600A external-priority patent/KR101646512B1/ko
Application filed by 엘지전자 주식회사 filed Critical 엘지전자 주식회사
Priority to US13/516,685 priority Critical patent/US8891654B2/en
Publication of WO2011074818A2 publication Critical patent/WO2011074818A2/fr
Publication of WO2011074818A3 publication Critical patent/WO2011074818A3/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
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H04B7/0426—Power distribution

Definitions

  • the following description relates to a distributed antenna system, and more particularly, to a method of transmitting a signal in a distributed antenna system.
  • DAS Distributed Antenna System
  • the DAS is a system using a plurality of distributed antennas connected to a single base station by a wired or dedicated line.
  • a single base station manages a plurality of antennas located a predetermined distance or more away from a cell serviced by a base station.
  • a plurality of antennas are distinguished from a centralized antenna system (CAS) in which base station antennas are concentrated in a cell center in that a plurality of antennas are distributed at a distance apart from each other by a predetermined distance.
  • CAS centralized antenna system
  • the DAS is distinguished from a femto cell in that each unit of the distributed antennas manages all the distributed antenna regions located in the cell at the base station in the cell, rather than the region of the antenna itself.
  • each of the distributed antennas can transmit different signals to respective terminals adjacent to the antenna, which is also distinguished from a repeater structure that simply amplifies and transmits signals.
  • Such a DAS can be regarded as a kind of multiple input multiple output (MIMO) system in that distributed antennas can simultaneously transmit and receive different data streams to support a single or multiple mobile satation.
  • the DAS is antennas distributed at various locations in a cell, and thus, a transmission area is reduced for each antenna as compared to the CAS, thereby reducing the transmission power.
  • the transmission distance between the antenna and the terminal to reduce the path loss to enable high-speed data transmission, it is possible to increase the transmission capacity and power efficiency of the cellular system, and relatively to the CAS regardless of the position of the user in the cell It can satisfy the communication performance of uniform quality.
  • the base station and a plurality of distributed antennas are connected by a wired or dedicated line, signal loss can be reduced, and correlation and interference between antennas can be reduced, thereby having a high signal to interference plus noise ratio (SINR). .
  • SINR signal to interference plus noise ratio
  • the DAS reduces cellular base station cost and backhaul network maintenance cost in the next generation mobile communication system, and increases cellular service coverage, improves channel capacity, and SINR.
  • a CAS-based communication standard needs to support not only CAS but also DAS.
  • the present invention also proposes a method of selecting an optimal precoding matrix according to a wireless environment when a base station communicates with a specific terminal in a codebook for a DAS, and transmitting a signal using the same.
  • a method for transmitting a signal to any terminal by a base station a base station including a plurality of antennas located a predetermined distance or more away Control information including at least one of antenna selection information about a specific number of antennas used for communication with the terminal among the plurality of antennas and information on a power ratio allocated to each of the specific number of antennas, to the terminal; Transmitting a signal, selecting a precoding matrix corresponding to at least one of the antenna selection information and the power ratio information from a codebook for DAS, and transmitting a signal to the terminal using the precoding matrix.
  • the DAS codebook may include an antenna selection matrix corresponding to the antenna selection information and a power control matrix corresponding to the power ratio information.
  • the precoding matrix may be composed of a product of a CAS precoding matrix W and a specific matrix P, wherein the CAS precoding matrix W is allocated power to the plurality of antennas at the same ratio. It may include a matrix corresponding to the power ratio information.
  • the specific matrix P may be specified by one or more of the antenna selection information and the power ratio information.
  • control information is determined semi-static and may be transmitted over a dedicated control channel.
  • a method for receiving a signal by the terminal from the base station including a plurality of antennas located a predetermined distance or more, the plurality of Receiving control information including at least one of antenna selection information about a specific number of antennas used for communication with the terminal among antennas and information on a power ratio allocated to each of the specific number of antennas; And receiving the signal from the digital signal processor and processing the signal using a precoding matrix selected corresponding to at least one of the antenna selection information and the power ratio information from the DAS codebook.
  • the base station of the distributed antenna system for solving the above problems, a plurality of antennas that are located a predetermined distance or more, a memory for storing the codebook for DAS, the plurality of antennas Generating control information including at least one of antenna selection information about a specific number of antennas used for communication with the terminal and information on a power ratio allocated to each of the specific number of antennas, and A processor for precoding a signal transmitted to an arbitrary terminal belonging to a DAS by selecting a precoding matrix corresponding to at least one of the antenna selection information and the power ratio information, and transmitting the control information and the signal to the terminal. It includes a transmission module for.
  • the base station including a plurality of antennas that are located at least a predetermined distance from the base station of the plurality of antennas with the terminal
  • a reception module for receiving a signal and control information including at least one of antenna selection information on a specific number of antennas used for communication and information on a power ratio allocated to each of the specific number of antennas, and a codebook for a DAS
  • a processor for selecting a precoding matrix corresponding to at least one of the antenna selection information and the power ratio information from the codebook for the DAS, and processing the signal using the selected precoding matrix.
  • a conventional codebook can be used to configure a DAS codebook that can be variously operated according to signaling, and can transmit and receive signals using the DAS codebook.
  • a precoding matrix can be selected and used to send and receive signals.
  • FIG. 1 is a diagram illustrating an example of a structure of a distributed antenna system to which the present invention is applied.
  • FIG. 2 is a diagram illustrating an example of a process of transmitting and receiving a signal between a base station and a terminal in a distributed antenna system according to an embodiment of the present invention.
  • FIG. 3 is a flowchart illustrating an example of a process of configuring a codebook for a DAS related to an embodiment of the present invention.
  • FIG. 4 is a flowchart illustrating another example of a process of configuring a codebook for a DAS related to an embodiment of the present invention.
  • FIG. 5 is a block diagram for explaining a terminal and a base station (FBS, MBS) in which the above-described embodiments of the present invention can be performed as another embodiment of the present invention.
  • a terminal collectively refers to a mobile or fixed user terminal device such as a user equipment (UE), a mobile station (MS), and the like.
  • the base station collectively refers to any node of the network side that communicates with the terminal, such as Node B, eNode B, Base Station.
  • a DAS having a plurality of antennas wired to a single base station located in a cell and distributed to various locations in a cell may be implemented in various ways according to the number and positions of the antennas. For example, a plurality of antennas may be distributed at regular intervals within a cell, or two or more antennas may be densely located at a specific place. In the DAS, signal transmission of rank 2 or more is possible when the coverage of each antenna is overlapped regardless of how distributed antennas are located in a cell. The rank represents the number of data streams that can be transmitted through one or more antennas at one time.
  • FIG. 1 is a diagram illustrating an example of a DAS structure to which the present invention is applied.
  • a single base station is wired to a total of eight antennas in a single cell, and each antenna may be located at a predetermined interval or at various intervals over a predetermined distance in the cell.
  • each antenna may be located at a predetermined interval or at various intervals over a predetermined distance in the cell.
  • an appropriate number of antennas can be used based on the signal transmission range of each antenna, the coverage of the adjacent antennas, the degree of overlap, the interference effect, and the distance between the antenna and the mobile terminal (User). For example, when three UEs are located in a cell as shown in FIG. 1 and UE 1 is located within a signal transmission range of antennas 1,2,7,8, UE 1 is a base station antenna 1,2,7.
  • antennas 3, 4, 5, and 6 from UE1's point of view have a large distance between the antenna and the UE, which is likely to cause a path loss and increase power consumption.
  • Signals transmitted from 5 and 6 may be negligibly small values
  • UE 2 is located at an overlapped portion of the signal transmission range of antennas 6 and 7, and transmits through another antenna except for antennas 6 and 7.
  • the signal is weak and very small or negligible, UE 3 can receive the signal transmitted through the antenna 3 located within close distance of the antenna 3 by proprietary.
  • the DAS when the positions of a plurality of antennas in a cell are separated from each other, the DAS operates like a MIMO system.
  • the base station may simultaneously communicate with UE 1 through antenna group 1 consisting of antennas 1,2, 7, and 8, antenna group 2 consisting of antennas 6, 7 and UE 2, and antenna 3 with UE 3 simultaneously.
  • the antennas 4 and 5 may transmit or operate in a turned off state for the UE 3 and the UE 2, respectively.
  • the DAS system may vary in the number of data streams transmitted for each mobile terminal in a single user / multi user (SU / MU) -MIMO communication, and an antenna or an antenna group allocated to each mobile terminal located in a cell serviced by a base station There may also be various.
  • An antenna or a group of antennas communicating with the terminal may be specified according to the location of the mobile terminal located in the cell, but may be adaptively changed according to the movement of the mobile terminal in the cell.
  • the entire antenna connected to the base station is not used for communication with a specific mobile terminal, and some antennas or antenna groups are used.
  • the DAS precoding matrix is used to transmit and receive signals between the base station and the terminal. This is necessary.
  • the present invention relates to a method of sharing control information for selecting a precoding matrix for a DAS and communicating signals using a selected precoding matrix for a DAS in a communication process between a base station belonging to a DAS and an arbitrary terminal. This will be described with reference to 2.
  • FIG. 2 is a diagram illustrating an example of a signal transmission and reception process between a base station and a terminal of a distributed antenna system according to an embodiment of the present invention.
  • the base station belonging to the DAS determines DAS control information regarding a DAS precoding matrix used for communication with the terminal among all the base stations antennas before transmitting a signal to an arbitrary terminal (S101).
  • the DAS control information includes information about a precoding matrix for transmitting a signal by selecting a base station antenna so as to minimize an interference rate generated between other terminals when the base station communicates with a specific terminal.
  • the DAS control information includes antenna selection information about a specific number of antennas used for communication with the terminal among all antennas by the base station including a plurality of distributed antennas, and power control information about power ratios allocated to each of the selected antennas. It may include.
  • the path loss between a specific terminal and the antenna is nonuniform due to the distribution of antenna positions. Accordingly, when using a precoding matrix having a uniform power allocation ratio for each antenna, when two or more terminals exist near one antenna, a signal to be transmitted to one terminal may be transmitted to another terminal, thereby increasing the interference rate. It is desirable to adjust the power ratio allocated to each star.
  • the DAS control information may include index (precoding matrix index) information regarding a DAS precoding matrix selected by a base station according to an embodiment of the present invention.
  • the base station transmits the DAS control information determined to the terminal, and shares the information for selecting the DAS precoding matrix used when the base station transmits a signal to the terminal (S102).
  • the base station selects an arbitrary precoding matrix from a preset DAS codebook according to the DAS control information to configure a precoder (S103), and transmits a signal to the terminal using the selected precoding matrix (S104).
  • the codebook for DAS includes an antenna selection type matrix corresponding to the antenna selection information and a power control type matrix corresponding to the power ratio information.
  • the terminal processes the received signal by demodulating the signal transmitted from the base station by using the received DAS control information or using a precoded pilot (DRS / DM-RS). (S105).
  • the DAS control information may be determined to be semi-static in step S101.
  • the base station may determine a specific antenna used for communication with the terminal according to a measurement result of the uplink signal transmitted from the terminal or the overall network situation, and determine a power ratio allocated to each antenna.
  • the base station may determine based on the feedback information transmitted from the terminal, the feedback information by measuring the downlink signal transmitted from the base station or information about the specific antenna searched by the terminal in the stationary or mobile state Derived channel state information, and the like.
  • the terminal since the DAS codebook to be described later is also set in the base station and the terminal, the terminal selects an optimized precoding matrix from the DAS codebook according to the channel strength of a specific antenna or antenna group during communication with the base station, and Other PMI information may be feedbacked to the base station. In this case, the step of transmitting the DAS control information by the base station to the terminal may be omitted.
  • Precoding coefficients corresponding to each column and row constituting the precoding matrix correspond to a specific antenna (port).
  • FIG. 3 is a flowchart illustrating an example of a process of configuring a codebook for a DAS related to an embodiment of the present invention.
  • a matrix of antenna selection types corresponding to information on the selected specific antenna is configured.
  • a matrix including antenna selection information may be configured by setting a specific row or a specific column corresponding to an unselected antenna or an antenna group among all base station antennas to zero.
  • the precoding matrix of the antenna selection type of rank 2 may be designed as in Equation 1.
  • a power control matrix corresponding to information about a power ratio allocated to antennas selected for performing communication with a specific terminal is configured (S203).
  • the coefficients of the matrix elements in the precoding matrix may represent a power ratio allocated for each corresponding antenna.
  • the base station can transmit the same signal to UE 2 through distributed antennas 6 and 7.
  • the power ratio nonuniformly such as [0.8 1/2 0.2 1/2 e j ⁇ ] T
  • T the matrix coefficient uniformly as T (where ⁇ is an arbitrary phase).
  • It is to improve the performance of each antenna by adjusting the power allocation ratios for the antennas 6 and 7 used by the base station to transmit signals to the UE 2 by the coefficient ratio of the precoding vector. Improving the antenna performance may improve the performance of the entire system in consideration of interference to other terminals as well as the performance of the target terminal to which the base station transmits signals.
  • the DAS precoding matrix corresponding to the antenna selection information and the power control information may be configured (S204), and the DAS codebook may be configured based on this (S205).
  • a codebook for a DAS configured according to an embodiment of the present invention is pre-stored in a base station and a terminal, and the base station or terminal selects a precoding matrix for a specific terminal from the codebook for the DAS according to the overall network situation from the stored codebook. Can be configured.
  • the base station may transmit to the terminal DMI control information or PMI information about the selected precoding matrix including at least one of antenna selection information and power control information used to configure the precoder.
  • FIG. 4 is a flowchart illustrating another example of a process of configuring a codebook for a DAS related to an embodiment of the present invention.
  • an arbitrary precoding matrix W is selected from a codebook used in a conventional CAS or a codebook composed of precoding matrices corresponding to power control information for allocating the same power to all base station antennas (S301).
  • the precoding matrix W may be selected from a concatenated codebook or a nested codebook.
  • a power control matrix P including power distribution ratio information between base station antennas according to an embodiment of the present invention is configured (S302).
  • the power control matrix P is a matrix including information for allocating a power ratio for each antenna so as to minimize the interference rate with other terminals according to the distance between the terminal and the antenna or the network condition.
  • the P matrix may be selected from a matrix set that includes one or more power control matrices.
  • the selected arbitrary precoding matrix W and the power control matrix P are converted into a precoding matrix W DAS in the DAS through a predetermined calculation process as shown in Equation 2 (S303).
  • the W matrix is a precoding matrix of the total number of antennas (N tx ) ⁇ rank r selected from a conventional CAS codebook or consecutive codebooks allocating the same power to all base station antennas
  • the P matrix is an embodiment of the present invention.
  • the P matrix for power control determined in step S302 is an antenna selection type matrix including information on a part of antennas used among all antennas of the base station as in the embodiment of the present invention described above with reference to FIG. 3. Can be. This is because when the matrix coefficient representing the power allocation ratio is set to 0, it means that the antenna corresponding to the corresponding row is not used in communication. The power allocated to each antenna of the base station can be adjusted through the coefficients of the diagonal elements of the P matrix.
  • p n When the n-th diagonal element of the P matrix is p n , p n may be limited according to Equation 3 according to power control of the system or power allocated to each of a plurality of terminals located in a cell.
  • the coefficients of the precoding matrix corresponding to the nth base station antenna are scaled by power p ⁇ 2 according to Equation 3 Can be.
  • the power scaling factors of the unused antennas are set to 0 to indicate antenna selection information that the UE intends to communicate using only a specific base station antenna or antenna group. do.
  • the ratio of power can be adjusted by the ratio of the squares of the power scaling elements to antenna power allocation.
  • the DAS codebook including a precoding matrix in this DAS configured by the same procedure can be designed (S304).
  • a base station uses a precoding matrix for DAS configured as shown in FIG. 4, power allocated to each selected antenna may be limited.
  • the coefficients of the precoding matrices corresponding to the k th antenna unit are w k1 , w k2 , ..., w kr They may be included in the same precoding matrix or in another precoding matrix corresponding to another terminal.
  • Equation 4 the average power (P) used for transmission in the k-th antenna unit when the respective precoding matrices are transmitted by combining the same power ratio (P). k ) is the same as Equation 4.
  • Equation 4 ⁇ k is a coefficient assigned to satisfy the power limit of the k th antenna unit.
  • the coefficient may be transmitted to all terminals, or may be differently applied as a control signal to each terminal since the coefficient applied to the codebook used by the terminal may be different.
  • the terminal may use the precoded pilot (DRS / DM-RS), etc. without the separate signal, to allow the UE to find out the coefficients by itself.
  • the coefficient may be transmitted to all terminals, or may be differently applied as a control signal to each terminal since the coefficient applied to the codebook used by the terminal may be different.
  • the terminal may use the precoded pilot (DRS / DM-RS), etc. without the separate signal, to allow the UE to find out the coefficients by itself.
  • the control information transmitted from the base station to the UE includes index information of the precoding matrix W selected from the CAS codebook and power control matrix P. It may include index information.
  • the base station to inform the terminal of the index of the W matrix and the index (or power scaling factors) of the P matrix (or the power reporting factors) differently Can also be set.
  • the codebook size may be further included to further include a precoding matrix for the DAS in the conventional codebook to vary the power allocation for the distributed antenna.
  • the base station may separately transmit index information of the precoding matrix and the power control matrix used by the base station to configure the precoder.
  • the terminal may determine power scaling factors based on information measured from a downlink signal such as a pilot transmitted from the base station, or select an arbitrary P matrix from the power control matrix set and transmit the feedback to the base station.
  • a downlink signal such as a pilot transmitted from the base station
  • a separate DAS codebook may be configured that includes the DAS precoding matrices calculated through the process illustrated in FIG. 4.
  • the DAS precoding matrix corresponding to at least one of the antenna selection information and the power control information is included in the codebook regardless of the total number of base station antennas N tx and ranks.
  • the sum power of each column of (sum power) is considered to consist of 1 constant.
  • the sum of power ratios of each column in the precoding matrix may not be 1, or the sum of power ratios of each column may be set differently according to N tx and the number of ranks.
  • a codebook including a precoding matrix constructed according to the embodiments of the present invention is a precoding matrix. To all codebooks where any value is scaled.
  • Precoding matrices suitable for the DAS generated according to the embodiments of the present invention are included in the conventional CAS codebook and designed as a single codebook or by separating the CAS codebook and the DAS codebook by whether the base station and the UE belong to the CAS, or You can also use the codebook by letting it know if it belongs to a DAS.
  • a plurality of terminals are provided with indication information indicating whether the base station and the UE belong to the DAS or CAS through broadcast information such as PBCH in LTE / LTE-A and SFH in IEEE 802.16. You can also tell.
  • a codebook suitable for the specific cell may be downloaded and used.
  • a terminal and a base station (FBS, MBS) belonging to the DAS in which the above-described embodiments of the present invention can be performed will be described.
  • the mobile terminal may operate as a transmitter in uplink and as a receiver in downlink.
  • the base station may operate as a receiver in the uplink, and may operate as a transmitter in the downlink. That is, the mobile terminal and the base station may include a transmitter and a receiver for transmitting information or data.
  • the transmitter and receiver may include a processor, module, part, and / or means for carrying out the embodiments of the present invention.
  • the transmitter and receiver may include a module (means) for encrypting the message, a module for interpreting the encrypted message, an antenna for transmitting and receiving the message, and the like.
  • a module for encrypting the message
  • a module for interpreting the encrypted message an antenna for transmitting and receiving the message, and the like.
  • FIG. 5 is a block diagram for explaining a terminal and a base station (FBS, MBS) in which the above-described embodiments of the present invention can be performed as another embodiment of the present invention.
  • the left side shows a structure of a transmitting end
  • the right side shows a structure of a receiving end
  • the transmitting end shows an example of a base station belonging to a DAS
  • the receiving end shows a cell serviced by the base station.
  • An example of a terminal located in the network is shown.
  • Each of the transmitting end and the receiving end may include an antenna 300, 400, a receiving module 310, 410, a processor 320, 420, a transmitting module 330, 430, and a memory 350, 450.
  • Each component may perform a function corresponding to each other.
  • each component will be described in more detail.
  • the antennas 300 and 400 are reception antennas for receiving a wireless signal from the outside and transmitting the signals generated by the transmission modules 330 and 430 to the receiving module 310 and 410. It is composed. Two or more antennas 300 and 400 may be provided when a multi-antenna (MIMO) function is supported.
  • MIMO multi-antenna
  • a channel state, a position of a terminal, a distance between a base station and a terminal, etc. may be provided when performing communication between a transmitter and a receiver. Based on this, a specific antenna or a group of antennas may be used among all base station antennas.
  • the antenna 300 of the transmitting end may be a specific antenna or a group of antennas selected for communication with a receiving end of a plurality of antennas located at a distance or more connected to the base station, and the selected antenna or antenna group is not fixed. It may fluctuate depending on the positional fluctuation of the.
  • the receiving module 310 or 410 may decode and demodulate a radio signal received through an antenna from the outside, restore the demodulated data to a form of original data, and transmit the decoded data to the processors 320 and 420.
  • the receiving module and the antenna may be represented as a receiving unit for receiving a radio signal without being separated as shown in FIG. 5.
  • Processors 320 and 420 typically control the overall operation of the transmitter or receiver.
  • a controller function for performing the above-described embodiments of the present invention a medium access control (MAC) frame variable control function, a handover function, an authentication and encryption function, etc. according to service characteristics and a propagation environment may be performed.
  • MAC medium access control
  • the transmission modules 330 and 430 may perform a predetermined coding and modulation on data scheduled from the processors 320 and 420 to be transmitted to the outside, and then transmit the data to the antenna.
  • the transmitter module and the antenna may be represented as a transmitter for transmitting a radio signal without being separated as shown in FIG.
  • the memory 350 or 450 may store a program for processing and controlling the processors 320 and 420, and input / output data (in the case of a mobile terminal, an uplink grant allocated from a base station, a UL grant, Functions for temporary storage of system information, STID, FID, operating time, etc.
  • the memory 350, 450 may be a flash memory type, a hard disk type, or multimedia. Multimedia card micro type, card type memory (e.g.
  • RAM random access memory
  • SRAM static random access memory
  • ROM read-only memory
  • ROM read-only memory
  • EEPROM Electrically Erasable Programmable Read-Only Memory
  • PROM PROM
  • magnetic memory a magnetic disk, and an optical disk.
  • the memory 350 and 450 may store a codebook for a DAS configured according to an embodiment of the present invention.
  • the codebook for a DAS according to the present invention is a codebook configured according to the above embodiments, and includes an antenna selection matrix corresponding to information about a base station antenna selected according to a position of a terminal in a cell and an amount of power allocated to each of the selected antennas. It may include a power control matrix corresponding to the power control information about.
  • the memory 350, 450 includes a conventional codebook or a codebook including precoding matrices for allocating the same power to all base station antennas, and a power control matrix set including information for controlling power ratios for each antenna. May be stored.
  • the stored codebook may be a codebook for the DAS consisting of only the precoding matrix for the DAS or a codebook that can be used in the DAS and the CAS including the precoding matrix for the DAS and the precoding matrices for use in the conventional CAS. .
  • the processor 320 of the transmitting end performs an overall control operation for the base station, and may include a precoder generating module 340 for generating a precoder for satisfying an optimal performance in the base station.
  • the processor 320 performs a measurement on a channel state or the like based on an uplink signal transmitted through the transmitting module 330 of the receiving end, and stores the memory 350 based on the result of the execution and information on the selected antenna 300.
  • the matrix P representing the power allocation ratio may be determined by measuring an uplink signal received from the terminal through the receiving module 310 or selected from a control matrix set stored in the memory 350.
  • the processor 320 may generate DAS control information including at least one of antenna selection information and power control information used for precoding matrix selection and transmit the generated DAS control information to the receiving end.
  • the DAS control information may include index information of a DAS precoding matrix selected by a transmitter from a codebook for a DAS.
  • W arbitrary precoding matrix
  • the processor 320 selects an arbitrary precoding matrix (W) from the CAS codebook and constructs the DAS precoding matrix through operation with the power control matrix (P)
  • the processor 320 selects an arbitrary precoding matrix (W).
  • the DAS control information including the power scaling factor or the index information about the matrix P regarding the index information and the power allocation ratio may be transmitted to the receiver through the transmitting module 330.
  • the precoder generating module 340 may not only configure the precoder based on the result of measuring the received signal by the transmitter, but also configure the precoder using the feedback information transmitted from the receiver.
  • the processor 420 of the receiving end may include a signal processing module 421 for processing a signal transmitted from the transmitting end and a feedback information generating module 422 for generating feedback information to be transmitted to the transmitting end, while performing an overall control operation for the terminal. Can be.
  • the signal processing module 421 selects a precoding matrix from the DAS codebook stored in the memory 450 based on the DAS control information transmitted from the transmitting end through the receiving module 410, and performs a signal processing process such as demodulation on the received signal. Do this.
  • the feedback information generation module 422 when the processor 420 measures the downlink signal transmitted from the transmitting end and selects a matrix corresponding to the antenna selection information for selecting a specific antenna or antenna group having a strong channel strength from the codebook for the DAS, Feedback information including PMI information about the signal measurement result or the selected precoding matrix may be generated.
  • the feedback information may include index information of a power scaling element or a power control matrix based on information measured from a pilot transmitted from a transmitter.
  • the base station is a controller function for performing the above-described embodiments of the present invention, orthogonal frequency division multiple access (OFDMA) packet scheduling, time division duplex (TDD) packet scheduling and channel multiplexing function MAC frame variable control function according to service characteristics and propagation environment, high speed traffic real time control function, handover function, authentication and encryption function, packet modulation and demodulation function for data transmission, high speed packet channel coding function and real time modem control function Etc.
  • OFDMA orthogonal frequency division multiple access
  • TDD time division duplex
  • MAC frame variable control function according to service characteristics and propagation environment
  • high speed traffic real time control function handover function
  • authentication and encryption function packet modulation and demodulation function for data transmission
  • high speed packet channel coding function and real time modem control function Etc may be performed through at least one of the above-described modules, or may further include additional means, modules or parts for performing such a function.
  • Embodiments of the present invention can be applied to a base station and a terminal, or other communication equipment of a wireless communication system.

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  • Radio Transmission System (AREA)

Abstract

La présente invention concerne un procédé permettant de configurer, pour chacun d'une ou plusieurs rangées du système DAS (Distributed Antenna System pour Système à Antennes Réparties), un livre de code destiné à un système DAS, incluant des matrices de pré-codage correspondant au système DAS, les matrices contenant des informations concernant au moins une ou plusieurs antennes utilisées pour les communications avec un terminal spécifique, parmi l'ensemble des antennes de la station de base qui fait partie du système DAS, et des informations concernant le rapport de puissance électrique allouée à chacune des antennes de la station de base. La présente invention concerne également un procédé permettant d'émettre un signal qui est pré-codé en utilisant les matrices de pré-codage ainsi configurées pour le système DAS.
PCT/KR2010/008693 2009-12-17 2010-12-07 Procédé de transmission d'un signal au moyen d'un système à antennes réparties WO2011074818A2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US13/516,685 US8891654B2 (en) 2009-12-17 2010-12-07 Method for transmitting a signal in a distributed antenna system

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US28768809P 2009-12-17 2009-12-17
US61/287,688 2009-12-17
KR1020100015600A KR101646512B1 (ko) 2009-12-17 2010-02-22 분산 안테나 시스템에서의 신호 전송 방법
KR10-2010-0015600 2010-02-22

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WO2011074818A2 true WO2011074818A2 (fr) 2011-06-23
WO2011074818A3 WO2011074818A3 (fr) 2011-11-17

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Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
M. GRIEGER ET AL.: 'On the Performance of Compressed Interference Forwarding for Uplink Base Station Cooperation' IEEE 2009 GLOBAL TELECOMMUNICATIONS CONFERENCE 04 December 2009, *
R. OSAWA ET AL.: 'Performance of Two-Way Channel Estimation Technique for Multi-User Distributed Antenna Systems with Spatial Precoding' 2009 IEEE 70TH VEHICULAR TECHNOLOGY CONFERENCE FALL (VTC 2009-FALL) 23 September 2009, *
W. CHOI ET AL.: 'Downlink Performance and Capacity of Distributed Antenna Systems in a Multicell Environment' IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS vol. 6, no. 1, January 2007, pages 69 - 73 *

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