WO2009152695A1 - 分布式天线系统及其数据传输方法、中心控制器 - Google Patents

分布式天线系统及其数据传输方法、中心控制器 Download PDF

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Publication number
WO2009152695A1
WO2009152695A1 PCT/CN2009/000668 CN2009000668W WO2009152695A1 WO 2009152695 A1 WO2009152695 A1 WO 2009152695A1 CN 2009000668 W CN2009000668 W CN 2009000668W WO 2009152695 A1 WO2009152695 A1 WO 2009152695A1
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Prior art keywords
wireless transceiver
central controller
data
transceiver unit
terminal
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PCT/CN2009/000668
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English (en)
French (fr)
Inventor
孙韶辉
侯云哲
王映民
谢永斌
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大唐移动通信设备有限公司
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Application filed by 大唐移动通信设备有限公司 filed Critical 大唐移动通信设备有限公司
Priority to US12/999,210 priority Critical patent/US8472409B2/en
Priority to KR1020117001176A priority patent/KR101206402B1/ko
Publication of WO2009152695A1 publication Critical patent/WO2009152695A1/zh

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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
    • 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
    • H04L25/0202—Channel estimation
    • H04L25/0224—Channel estimation using sounding signals
    • 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
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • H04L5/0051—Allocation of pilot signals, i.e. of signals known to the receiver of dedicated pilots, i.e. pilots destined for a single user or terminal

Definitions

  • the present invention relates to the field of communications technologies, and in particular, to a distributed antenna system, a data transmission method thereof, and a central controller. Background technique
  • the ITU International Telecommunication Union
  • IMT-Advanced International Mobile Telecommunications-Advanced
  • the peak rate of uplink and downlink data transmission needs to reach 500Mbps/Hz and 1Gbps/Hz, and there is also a very high demand for the average spectral efficiency and edge spectrum efficiency of the system.
  • LTE-Advanced LTE Long Term Evolution Optimized Long Term Evolution System
  • Distributed antenna technology to improve system performance.
  • Distributed antenna technology is to connect RF and antenna devices in a geographical area, and connect all RF devices to the central controller through transmission lines such as optical fibers. The distance between each pair of distributed antennas is generally greater than 10 times the carrier wavelength.
  • the central controller controls the antenna that transmits signals to the terminal at each moment and receives signals from the terminal.
  • Figure 1 shows the transmission of the downlink transmission data at time T. At time T, the central controller selects three distributed antennas for transmitting data from the base station to the terminal.
  • Distributed antenna technology is considered by the 3GPP LTE-Advanced to be a promising multi-antenna technology for improving the throughput and spectrum utilization of dense cell systems.
  • Distributed antenna technology has become a hot research technology in LTE-Advanced, distributed antennas. It can improve system capacity and cell edge transmission efficiency, avoid inter-cell interference, and improve the performance of the entire system.
  • LTE-Advanced distributed antennas. It can improve system capacity and cell edge transmission efficiency, avoid inter-cell interference, and improve the performance of the entire system.
  • Embodiments of the present invention provide a data transmission method for a distributed antenna system, which is used to implement a distributed antenna solution in a communication system, and improve communication system performance.
  • the system includes a central controller and a plurality of wireless transceiver units, and the data Transmission methods include:
  • the wireless transceiver unit measures the received terminal pilot signal power and sends the power to the central controller; the central controller selects a wireless transceiver unit set to send data to the terminal according to the power of the terminal pilot signal sent by the plurality of the wireless transceiver units;
  • the central controller performs data processing according to the set of wireless transceiver units
  • the central controller distributes the processed data to the wireless transceiver unit in the set of wireless transceiver units;
  • the wireless transceiver unit in the set of wireless transceiver units performs downlink data transmission.
  • the embodiment of the present invention further provides a central controller of a distributed antenna system, which is used to implement a distributed antenna solution in a communication system to improve communication system performance.
  • the central controller includes: a receiving module, configured to receive multiple wireless a terminal pilot signal power sent by the transceiver unit; a selection module, configured to select a wireless transceiver unit set to send data to the terminal according to the received terminal pilot signal power sent by the plurality of wireless transceiver units;
  • a data processing module configured to perform data processing according to the wireless transceiver unit set
  • a sending module configured to distribute the processed data to a wireless transceiver unit in the wireless transceiver unit set.
  • the embodiment of the invention further provides a distributed antenna system for implementing a distributed antenna solution in a communication system to improve communication system performance.
  • the system includes:
  • a plurality of wireless transceiver units configured to measure received terminal pilot signal power and transmit; and, perform downlink data transmission;
  • a central controller configured to select, according to power of the terminal pilot signal sent by the plurality of the wireless transceiver units, a set of wireless transceiver units that transmit data to the terminal; according to the set of the wireless transceiver unit Data processing; distributing the processed data to a wireless transceiver unit in the set of wireless transceiver units.
  • the wireless transceiver unit measures the received terminal pilot signal power and sends the power to the central controller.
  • the central controller selects the wireless sending data to the terminal according to the power of the terminal pilot signal sent by the plurality of the wireless transceiver units.
  • a central transceiver unit performs data processing according to the wireless transceiver unit set; the central controller distributes the processed data to the wireless transceiver unit in the wireless transceiver unit set; and the wireless transceiver unit in the wireless transceiver unit set The unit performs downlink data transmission to implement a distributed antenna solution in the communication system to improve communication system performance.
  • FIG. 1 is a schematic diagram of a distributed antenna implementation in the background art
  • FIG. 3 is a schematic diagram of a distributed antenna implementation according to an embodiment of the present invention
  • FIG. 4 is a schematic structural diagram of a central controller of a distributed antenna system according to an embodiment of the present invention
  • FIG. 5 is a schematic structural diagram of a data processing module according to an embodiment of the present invention
  • FIG. 6 is a schematic structural diagram of a processing unit according to an embodiment of the present invention.
  • FIG. 7 is a schematic structural diagram of a distributed antenna system according to an embodiment of the present invention. detailed description
  • the distributed antenna system in the embodiment of the present invention includes a central controller and a plurality of wireless transceiver units.
  • the data transmission processing flow of the distributed antenna system is shown in FIG. 2, and the specific process description is as follows:
  • Step 201 The wireless transceiver unit measures the received terminal pilot signal power and sends the power to the central controller.
  • Step 202 The central controller according to the terminal pilot signal function sent by the plurality of the wireless transceiver units
  • Step 203 The central controller performs data processing according to the wireless transceiver unit set.
  • Step 204 The central controller distributes the processed data to a wireless transceiver unit in the set of wireless transceiver units.
  • Step 205 The wireless transceiver unit in the wireless transceiver unit set performs downlink data transmission.
  • Each wireless transceiver unit may include at least one antenna, which may send or receive one or more data streams, and is used to receive and measure the pilot signal power of the terminal, and the terminal may be configured according to the network at a specified time and frequency band.
  • the pilot signal is transmitted internally, and the pilot signal may be referred to as a Sounding Reference symbol, which is simply referred to as SRS.
  • SRS Sounding Reference symbol
  • the terminal can report the power of the pilot signal to the antenna, and the manner of reporting can be various, such as the absolute value of the reported power or the difference of the maximum transmit power.
  • the data between the data transmission power reported by the terminal and the power of the pilot signal can be used to calculate the power of the terminal pilot signal.
  • the central controller may determine channel state information when downlink data transmission is performed by using the wireless transceiver unit in the wireless transceiver unit set according to the terminal pilot signal power sent by the plurality of the wireless transceiver units; Data processing is performed based on the channel state information.
  • the central controller may determine channel state information of the uplink channel according to the power of the terminal pilot signal sent by the multiple wireless transceiver units; and further, according to channel state information of the uplink channel, channel state information of the channel; Data processing is performed according to channel state information of the downlink channel.
  • the distributed antenna system of the embodiment of the present invention can be applied to a TDD (Time Division Duplex) system or an FDD (Frequency Division Duplex) system.
  • the central controller may determine the channel state information of the downlink channel according to the symmetry of the uplink and downlink channels and the channel state information of the uplink channel.
  • the channel state information of the downlink channel refers to state information of a channel between each antenna and a terminal receiving multiple antennas in the downlink transmission multiple antenna, including information such as amplitude and phase of the signal. Due to the symmetry of the TDD uplink and downlink channels, the phase information of the receiving antenna of each transmitting antenna of the uplink terminal reaching the base station is the same as the phase of the antenna transmitting data of the base station to the terminal receiving antenna, and therefore, according to the symmetry, the channel of the uplink channel The status information may determine channel state information of the downlink channel.
  • the channel state information may be a channel impulse response matrix.
  • the central controller may determine the channel impulse response matrix of the downlink channel according to the channel impulse response matrix of the uplink channel, that is, the channel impulse response matrix (hereinafter referred to as the H matrix) of the terminal transmitting the pilot signal to the wireless transceiver unit set S. For example, the central controller may transpose the H matrix to convert channel phase state information of the receiving matrix to channel phase state information of the transmitting matrix.
  • the central controller may further determine the number of data streams sent to the terminal according to the channel state information; and subsequently perform data processing according to the number of the data streams and the channel state information.
  • the central controller may determine, according to the unitary matrix, that the data should be sent to the terminal by using two parallel data streams. Specifically, in implementation, the number of data streams sent to the terminal may be determined according to the eigenvalues of the ⁇ matrix decomposition.
  • the channel impulse response matrix may be decomposed to obtain each wireless reception in the wireless transceiver unit set. And a shaping weighting vector of the transmitting unit; and subsequently performing a weighting process on the data to be sent by each of the wireless transceiver units in the set of wireless transceiver units according to the obtained shaping weight vector.
  • the H matrix is decomposed, such as SVD (singular value) decomposition or EVD (eigenvalue) decomposition, and when the N data streams are sent to the terminal, the shaping weight of each wireless transceiver unit in the wireless transceiver unit set S is obtained.
  • the shaping weight vector can be multiplied by the data stream to be sent, so that the data stream to be transmitted can be more adapted to the state of the channel, so that the power of the downlink data is more For concentration, the interference is smaller, the signal-to-noise ratio is higher, and the system capacity is increased.
  • the central controller may perform weighting operations on the data of one or more streams, weighting parameters according to each stream and the wireless transceiver unit, and send the weighted processed data to the wireless transceiver unit in the wireless transceiver unit set.
  • the shaping operation is jointly performed between the wireless transceiver units in the wireless transceiver unit set, and the data of the same stream is processed by using different weighted shaping vector parameters in one or more 4 units.
  • the central controller may also distinguish between 'data transmission in the cell, different [alpha]' [alpha] in various different data transmission unit, with a 4 unit may transmit one or more streams.
  • the central controller sends the data streams sent by the different 4 units to the corresponding wireless transceiver unit, and the data sent by each wireless transceiver unit is different.
  • the network side may further carry control signaling in the downlink data sent by the radio transceiver unit in the radio transceiver unit set according to the CQI (Channel Quality Indicator) and the transmission channel condition reported by the terminal, where Indicates an OFDM time-frequency domain resource occupied by the transmitted data stream, and the subsequent terminal receives the downlink data in the OFDM time-frequency domain resource indicated by the control signaling.
  • the control command can also indicate the number of data streams transmitted, and the terminal receives the data stream by the number.
  • control signaling further includes a modulation mode and a coding rate of the downlink data; the subsequent terminal demodulates the received downlink data according to the modulation mode of the downlink data in the control signaling; and the downlink data according to the control signaling.
  • the coding rate is used to decode the demodulated downlink data.
  • the frequency domain resource block of the OFDN occupied by the data may also include a dedicated guide for demodulating the data. frequency.
  • the number of dedicated pilots is equal to the number of downlink data streams transmitted, and the dedicated pilots are processed according to the set of wireless transceiver units prior to transmission.
  • the processing may be performed according to the channel state information of the downlink channel, for example, by using the same weighting shaping parameter as the downlink data in the OFDM time-frequency domain resource.
  • the dedicated pilot A corresponds to the weighted shaping parameter of the data stream i in the corresponding time-frequency domain resource.
  • the subsequent terminal can demodulate the received downlink data according to the received dedicated pilot.
  • the embodiment of the present invention further provides a central controller of a distributed antenna system, and the structure thereof is as shown in FIG. 4, and may include:
  • the receiving module 401 is configured to receive terminal pilot signal power sent by multiple wireless transceiver units, where each wireless transceiver unit includes at least one antenna;
  • the selecting module 402 is configured to select, according to the received power of the terminal pilot signal sent by the multiple wireless transceiver units, a set of wireless transceiver units that send data to the terminal;
  • the data processing module 403 is configured to perform data processing according to the wireless transceiver unit set
  • the sending module 404 is configured to distribute the processed data to the wireless transceiver unit in the wireless transceiver unit set.
  • the data processing module 403 can include:
  • a determining unit 4031 configured to determine, according to the power of the terminal pilot signal sent by the plurality of the wireless transceiver units, channel state information when performing downlink data transmission by using the wireless transceiver unit in the wireless transceiver unit set;
  • the processing unit 4032 is configured to perform data processing according to the channel state information.
  • the channel state information refers to a channel impulse response matrix.
  • the processing unit 4032 may include:
  • the decomposition processing sub-unit 601 is configured to perform decomposition processing on the channel impulse response matrix to obtain a shaping weight vector of each wireless transceiver unit in the wireless transceiver unit set;
  • the weighting processing sub-unit 602 is configured to perform a weighting process on the data to be sent by each of the wireless transceiver units in the wireless transceiver unit set according to the obtained shaping weight vector.
  • the determining unit 4031 is further configured to determine, according to the channel state information, the number of data streams sent to the terminal.
  • the processing unit 4032 is further configured to perform data processing according to the number of the data streams and the channel state information.
  • an embodiment of the present invention further provides a distributed antenna system, and the structure thereof is as shown in FIG. 7, and includes:
  • a terminal 701 configured to send and receive data
  • the central controller 703 is configured to select, according to the power of the terminal pilot signal sent by the plurality of the wireless transceiver units, a set of wireless transceiver units that transmit data to the terminal; perform data processing according to the set of the wireless transceiver unit; and process the processed data. Distributed to the wireless transceiver unit in the set of wireless transceiver units.
  • the wireless transceiver unit measures the received terminal pilot signal power and sends the power to the central controller.
  • the central controller selects the wireless sending data to the terminal according to the power of the terminal pilot signal sent by the plurality of the wireless transceiver units.
  • a central transceiver unit performs data processing according to the wireless transceiver unit set; the central controller distributes the processed data to the wireless transceiver unit in the wireless transceiver unit set; and the wireless transceiver unit in the wireless transceiver unit set
  • the unit performs downlink data transmission to implement a distributed antenna solution in the communication system to improve communication system performance.
  • the embodiment of the present invention can be applied to a TDD system or an FDD system.
  • the process for data processing by the central controller according to the wireless transceiver unit set is also specifically applied to the TDD system.
  • the spirit and scope of the invention Thus, if the modifications and variations of the present invention belong to the present invention The present invention is also intended to cover such modifications and variations within the scope of the claims and their equivalents.

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Description

分布式天线系统及其数据传输方法、 中心控制器 技术领域
本发明涉及通信技术领域， 尤其涉及分布式天线系统及其数据传输方法、 中心控制器。 背景技术
ITU ( International Telecommunication Union, 国际电信联盟 )对下一代移 动 通 信 系 统 IMT-Advanced ( International Mobile Telecommunications- Advanced , 优化的国际移动电信系统 )的性能提出了非常 苛刻的要求，如最大系统传输带宽需要达到 100MHz, 上下行数据传输的峰值 速率需要达到 500Mbps/Hz和 lGbps/Hz, 并且对系统平均频谱效率和边缘频 谱效率也提出了非常高的需求。
为了满足 IMT-Advanced 系统的要求， 3GPP ( 3rd Generation Partner Project, 第三代伙伴关系计划）在其下一代移动蜂窝通信系统 LTE-Advanced ( LET Long Term Evolution优化的长期演进系统） 中提出了釆用分布式天线 技术来提高系统性能。 分布式天线技术是通过将射频和天线器件均勾地放置 在一个地理区域内， 并通过光纤等传输线将所有的射频器件与中心控制器相 连， 每对分布式天线间距离一般情况下都远大于 10倍的载波波长。 中心控制 器控制着每一时刻为终端发送信号的天线和接收从终端来的信号。 图 1 中给 出了下行发送数据 T时刻的传输情况。 在 T时刻中心控制器选择了三根分布 式天线用于发送基站的数据到终端。
分布式天线技术被 3GPP LTE-Advanced认为是一种比较有前途的提高密 集小区系统吞吐量和频谱利用率的多天线技术， 分布式天线技术已经成为 LTE-Advanced中的热点研究技术， 分布式天线可以提升系统容量和小区边缘 传输效率， 避免小区间干扰， 提高整个系统的性能。 而在目前的通信系统中， 尚未有成形和具体的分布式天线设计实现方案。
发明内容
本发明实施例提供一种分布式天线系统的数据传输方法， 用以在通信系 统中实现分布式天线解决方案， 提高通信系统性能， 所述系统包括中心控制 器及多个无线收发单元， 该数据传输方法包括：
无线收发单元测量接收的终端导频信号功率并发送给中心控制器； 中心控制器根据多个所述无线收发单元发送的终端导频信号功率， 选择 向终端发送数据的无线收发单元集合；
中心控制器根据所述无线收发单元集合进行数据处理；
中心控制器将处理后的数据分发至所述无线收发单元集合中的无线收发 单元；
所述无线收发单元集合中的无线收发单元进行下行数据发送。
本发明实施例还提供一种分布式天线系统的中心控制器， 用以在通信系 统中实现分布式天线解决方案， 提高通信系统性能， 该中心控制器包括： 接收模块， 用于接收多个无线收发单元发送的终端导频信号功率； 选择模块， 用于根据接收的多个无线收发单元发送的终端导频信号功率， 选择向终端发送数据的无线收发单元集合；
数据处理模块， 用于根据所述无线收发单元集合进行数据处理； 发送模块， 用于将处理后的数据分发至所述无线收发单元集合中的无线 收发单元。
本发明实施例还提供一种分布式天线系统， 用以在通信系统中实现分布 式天线解决方案， 提高通信系统性能， 该系统包括：
多个无线收发单元， 用于测量接收的终端导频信号功率并发送； 以及， 进行下行数据发送；
中心控制器， 用于根据多个所述无线收发单元发送的终端导频信号功率， 选择向终端发送数据的无线收发单元集合； 根据所述无线收发单元集合进行 数据处理； 将处理后的数据分发至所述无线收发单元集合中的无线收发单元。 本发明实施例中， 无线收发单元测量接收的终端导频信号功率并发送给 中心控制器； 中心控制器根据多个所述无线收发单元发送的终端导频信号功 率， 选择向终端发送数据的无线收发单元集合； 中心控制器根据所述无线收 发单元集合进行数据处理； 中心控制器将处理后的数据分发至所述无线收发 单元集合中的无线收发单元； 所述无线收发单元集合中的无线收发单元进行 下行数据发送， 从而在通信系统中实现分布式天线解决方案， 提高通信系统 性能。 附图说明
图 1为背景技术中分布式天线实现示意图； 图 3为本发明实施例中分布式天线实现示意图；
图 4为本发明实施例中分布式天线系统的中心控制器的结构示意图； 图 5为本发明实施例中数据处理模块的结构示意图；
图 6为本发明实施例中处理单元的结构示意图；
图 7为本发明实施例中分布式天线系统的结构示意图。 具体实施方式
下面结合说明书附图对本发明实施例进行详细说明。
本发明实施例中的分布式天线系统包括中心控制器及多个无线收发单 元， 该分布式天线系统的数据传输处理流程如图 2 所示， 具体的流程说明如 下：
步骤 201、无线收发单元测量接收的终端导频信号功率并发送给中心控制 器。
步骤 202、中心控制器根据多个所述无线收发单元发送的终端导频信号功 步骤 203、 中心控制器根据所述无线收发单元集合进行数据处理。
步骤 204、中心控制器将处理后的数据分发至所述无线收发单元集合中的 无线收发单元。
步骤 205、 所述无线收发单元集合中的无线收发单元进行下行数据发送。 每个无线收发单元中可以包括至少一根天线， 可以发送或接收一个或多 个数据流， 实施中用于接收并测量终端的导频信号功率， 终端可以根据网络 配置，在规定的时间和频段内发送导频信号，该导频信号可以被称为 Sounding Reference symbol (探测参考信号）， 简称为 SRS。 SRS可以有多个， 可以记为 = { ， ^…， ！,…, ∞} ,表示一共有 m条不同的 SRS,每条 ,由一 根或多根天线发送的导频信号组成。 如图 3 所示， 终端发送两条不同的 SRS = {SRSl , SRS2 } ^ 其中实线表示导频信号 虚线表示 ^2。 终端可以向天线上报其发送导频信号的功率， 上报的方式可以有多种， 如上报功率的绝对值或最大发送功率的差值等。 实施中也可以利用终端上报 的数据发送功率及该功率与导频信号功率之间的差值， 计算出终端导频信号 功率。
中心控制器可以根据多个无线收发单元发送的终端导频信号功率， 选择 向终端发送数据的无线收发单元集合。 以图 3 为例， 中心控制器选择无线收 发单元集合 S = {4， 4， 4 }用以向终端发送下行数据。 其中 S为网络侧基站覆盖 范围内所有分布式天线的子集合。
一个实施例中， 中心控制器可以根据多个所述无线收发单元发送的终端 导频信号功率， 确定利用所述无线收发单元集合中的无线收发单元进行下行 数据发送时的信道状态信息； 以及， 根据所述信道状态信息进行数据处理。 实施中， 中心控制器可以根据所述多个无线收发单元发送的终端导频信号功 率， 确定上行信道的信道状态信息； 再根据所述上行信道的信道状态信息， 信道的信道状态信息； 进而才艮据所述下行信道的信道状态信息进行数据处理。 本发明实施例的分布式天线系统可适用于 TDD ( Time division duplex, 时 分双工）系统或 FDD ( Frequency division duplex, 频分双工）系统。 以在 TDD 系统中应用为例， 中心控制器可以根据上下行信道的对称性和上行信道的信 道状态信息确定下行信道的信道状态信息。 下行信道的信道状态信息是指下 行发送多天线中每根天线与终端接收多天线间信道的状态信息， 包括信号的 幅度、 相位等信息。 由于 TDD上下行信道的对称性， 上行终端的每根发送天 线到达基站的接收天线的相位信息与基站中该天线发送数据到达终端接收天 线的相位相同， 因此根据该对称性， 由上行信道的信道状态信息可以确定所 述下行信道的信道状态信息。
信道状态信息可以是信道冲击响应矩阵。 中心控制器可以根据上行信道 的信道冲击响应矩阵，即终端发送导频信号到达无线收发单元集合 S的信道冲 击响应矩阵（后称 H矩阵）， 确定下行信道的信道冲击响应矩阵。 例如， 中心 控制器可以对 H矩阵进行转置处理， 用以从接收矩阵的信道相位状态信息转 换为发送矩阵的信道相位状态信息。
一个实施例中， 中心控制器可以根据信道状态信息， 进一步确定向终端 发送的数据流数目； 后续根据所述数据流数目和所述信道状态信息进行数据 处理。
中心控制器可以根据 H矩阵确定向终端发送的数据流数目 N (与终端发 送的并行复用数据流的数目相等）。 仍以图 3为例， 则终端发送导频信号到网 络侧的信道冲击响应 ^ = ）， 其中 ^表示导频信号到达无线收发单元 Α' 的信道冲击响应。终端发送 SRS1和 SRS2到网络侧， = 分别表示 SRS1 和 SRS2到达无线收发单元 4的信道冲击响应。 中心控制器可以根据该 Η矩 阵确定应釆用两个并行数据流的方式发送数据到终端， 具体在实施时， 可以 根据 Η矩阵分解的特征值来确定向终端发送的数据流数目。
—个实施例中， 中心控制器根据信道状态信息进行数据处理时， 可以对 信道冲击响应矩阵进行分解处理， 获得所述无线收发单元集合中每个无线收 发单元的赋形加权矢量； 后续根据获得的赋形加权矢量对所述无线收发单元 集合中每个无线收发单元待发送的数据进行赋形加权处理。
具体的， 对 H矩阵进行分解处理， 如 SVD (奇异值 )分解或 EVD (特征 值）分解， 获得向终端发送 N个数据流时， 无线收发单元集合 S内每个无线 收发单元的赋形加权矢量 ^ ^1^，^2，…，17"，…，^ , 其中^表示第 ^个无线 收发单元的第 个数据流的赋形加权值。
根据赋形加权矢量对待发送的数据流进行预处理时， 可以将赋形加权矢 量与待发送的数据流相乘， 使得待发送的数据流更能适应信道的状态， 从而 使得下行数据的功率更为集中， 干扰更小、 信噪比更高， 提高系统容量。
实施中， 中心控制器可以对一个或多个流的数据， 根据每个流和无线收 发单元的加权参数分别进行加权操作， 并将加权处理后的数据发送到无线收 发单元集合中的无线收发单元， 在无线收发单元集合中的无线收发单元之间 联合进行赋形操作， 同一个流的数据在一个或多个 4单元中通过不同的加权 赋形矢量参数进行处理后发送。
中心控制器还可以区分在不同 Α'单元内发送的数据， 不同 Α'单元发送的 数据不同， 同一个 4单元可以发送一个或多个流。 中心控制器将不同 4单元 发送的数据流发送到对应的无线收发单元， 各无线收发单元发送的数据不同。
一个实施例中， 网络侧还可以根据终端上报的 CQI ( Channel Quality Indicator, 信道质量指示）及发送信道条件， 在无线收发单元集合中的无线收 发单元发送的下行数据中携带控制信令， 用于指示发送的数据流占用的 OFDM时频域资源， 后续终端在所述控制信令指示的 OFDM时频域资源接收 下行数据。 控制指令还可以指示发送的数据流数目， 终端按该数目接收数据 流。
一个实施例中， 控制信令还包括下行数据的调制方式和编码速率； 后续 终端根据所述控制信令中下行数据的调制方式， 解调接收的下行数据； 根据 所述控制信令中下行数据的编码速率， 对解调后的下行数据进行译码。 一个实施例中，将加权赋形后的数据流通过无线收发单元集合 发送到终 端时， 在发送数据所占用的 OFDN时频域资源块内， 还可以包括该终端用于 解调数据的专用导频。 专用导频的数目等于所发送下行数据流的数目， 专用 导频在发送之前根据无线收发单元集合进行处理。 具体的， 可以根据下行信 道的信道状态信息进行处理， 如釆用与所处 OFDM时频域资源内发送下行数 据相同的加权赋形参数进行处理。 如专用导频 A与其对应的时频域资源内数 据流 i的加权赋形参数——对应。 后续终端可以根据接收的专用导频解调接收 的下行数据。
基于同一发明构思， 本发明实施例还提供一种分布式天线系统的中心控 制器， 其结构如图 4所示， 可以包括：
接收模块 401 , 用于接收多个无线收发单元发送的终端导频信号功率， 其 中， 每个无线收发单元包括至少一根天线；
选择模块 402 ,用于根据接收的多个无线收发单元发送的终端导频信号功 率， 选择向终端发送数据的无线收发单元集合；
数据处理模块 403， 用于根据所述无线收发单元集合进行数据处理； 发送模块 404 ,用于将处理后的数据分发至所述无线收发单元集合中的无 线收发单元。
如图 5所示， 一个实施例中， 数据处理模块 403可以包括：
确定单元 4031 , 用于根据多个所述无线收发单元发送的终端导频信号功 率， 确定利用所述无线收发单元集合中的无线收发单元进行下行数据发送时 信道状态信息；
处理单元 4032, 用于根据所述信道状态信息进行数据处理。
一个实施例中， 信道状态信息是指信道冲击响应矩阵； 如图 6所示， 处 理单元 4032可以包括：
分解处理子单元 601 , 用于对信道冲击响应矩阵进行分解处理， 获得所述 无线收发单元集合中每个无线收发单元的赋形加权矢量； 赋形加权处理子单元 602,用于根据获得的赋形加权矢量对所述无线收发 单元集合中每个无线收发单元待发送的数据进行赋形加权处理。
一个实施例中， 确定单元 4031还可以用于根据信道状态信息， 确定向终 端发送的数据流数目； 则处理单元 4032还可以用于根据所述数据流数目和所 述信道状态信息进行数据处理。
基于同一发明构思， 本发明实施例还提供一种分布式天线系统， 其结构 如图 7所示， 包括：
终端 701 , 用于发送和接收数据；
多个无线收发单元 702,用于测量接收的终端导频信号功率并发送；以及， 进行下行数据发送；
中心控制器 703 ,用于根据多个所述无线收发单元发送的终端导频信号功 率， 选择向终端发送数据的无线收发单元集合； 根据所述无线收发单元集合 进行数据处理； 将处理后的数据分发至所述无线收发单元集合中的无线收发 单元。
本发明实施例中， 无线收发单元测量接收的终端导频信号功率并发送给 中心控制器； 中心控制器根据多个所述无线收发单元发送的终端导频信号功 率， 选择向终端发送数据的无线收发单元集合； 中心控制器根据所述无线收 发单元集合进行数据处理； 中心控制器将处理后的数据分发至所述无线收发 单元集合中的无线收发单元； 所述无线收发单元集合中的无线收发单元进行 下行数据发送， 从而在通信系统中实现分布式天线解决方案， 提高通信系统 性能。
本发明实施例可以适用于 TDD系统或 FDD系统， 其中， 对于中心控制 器根据所述无线收发单元集合进行数据处理的过程， 还专门针对 TDD系统提 出了适用的解决方案。 发明的精神和范围。 这样， 倘若对本发明的这些修改和变型属于本发明权利 要求及其等同技术的范围之内， 则本发明也意图包含这些改动和变型在内

Claims

权 利 要 求
1、 一种分布式天线系统的数据传输方法， 所述系统包括中心控制器及多 个无线收发单元， 其特征在于， 该方法包括：
无线收发单元测量接收的终端导频信号功率并发送给中心控制器； 中心控制器根据多个所述无线收发单元发送的终端导频信号功率， 选择 向终端发送数据的无线收发单元集合；
中心控制器根据所述无线收发单元集合进行数据处理；
中心控制器将处理后的数据分发至所述无线收发单元集合中的无线收发 单元；
所述无线收发单元集合中的无线收发单元进行下行数据发送。
2、 如权利要求 1所述的方法， 其特征在于， 所述中心控制器根据所述无 线收发单元集合进行数据处理包括：
中心控制器根据多个所述无线收发单元发送的终端导频信号功率， 确定 利用所述无线收发单元集合中的无线收发单元进行下行数据发送时的信道状 态信息；
中心控制器根据所述信道状态信息进行数据处理。
3、 如权利要求 2所述的方法， 其特征在于， 所述信道状态信息是指信道 冲击响应矩阵；
所述中心控制器根据所述信道状态信息进行数据处理包括：
中心控制器对信道冲击响应矩阵进行分解处理， 获得所述无线收发单元 集合中每个无线收发单元的赋形加权矢量；
中心控制器根据获得的赋形加权矢量对所述无线收发单元集合中每个无 线收发单元待发送的数据进行赋形加权处理。
4、 如权利要求 2所述的方法， 其特征在于， 中心控制器根据所述信道状 态信息， 进一步确定向终端发送的数据流数目；
所述中心控制器根据所述信道状态信息进行数据处理是指： 中心控制器根据所述数据流数目和所述信道状态信息进行数据处理。
5、 如权利要求 1所述的方法， 其特征在于， 所述无线收发单元集合中的 无线收发单元发送的下行数据中包括控制信令， 所述控制指令用于指示下行 数据占用的正交频分复用 OFDM时频域资源；
该方法进一步包括：
终端在所述控制信令指示的 OFDM时频域资源接收下行数据。
6、 如权利要求 5所述的方法， 其特征在于， 所述控制信令还包括下行数 据的调制方式和编码速率；
该方法进一步包括：
终端根据所述调制方式， 解调接收的下行数据； 根据所述编码速率， 对 解调后的下行数据进行译码。
7、 如权利要求 5所述的方法， 其特征在于， 所述无线收发单元集合中的 无线收发单元发送的下行数据中还包括专用导频；
该方法进一步包括：
终端根据所述专用导频解调接收的下行数据。
8、 如权利要求 7所述的方法， 其特征在于， 所述专用导频在发送之前根 据所述无线收发单元集合进行处理。
9、 一种分布式天线系统的中心控制器， 其特征在于， 包括：
接收模块， 用于接收多个无线收发单元发送的终端导频信号功率； 选择模块， 用于根据接收的多个无线收发单元发送的终端导频信号功率， 选择向终端发送数据的无线收发单元集合；
数据处理模块， 用于根据所述无线收发单元集合进行数据处理； 发送模块， 用于将处理后的数据分发至所述无线收发单元集合中的无线 收发单元。
10、 如权利要求 9 所述的中心控制器， 其特征在于， 所述数据处理模块 包括： 确定单元， 用于根据多个所述无线收发单元发送的终端导频信号功率， 确定利用所述无线收发单元集合中的无线收发单元进行下行数据发送时的信 道状态信息；
处理单元， 用于根据所述信道状态信息进行数据处理。
11、 如权利要求 10所述的中心控制器， 其特征在于， 所述信道状态信息 是指信道冲击响应矩阵；
所述处理单元包括：
分解处理子单元， 用于对信道冲击响应矩阵进行分解处理， 获得所述无 线收发单元集合中每个无线收发单元的赋形加权矢量；
赋形加权处理子单元， 用于根据获得的赋形加权矢量对所述无线收发单 元集合中每个无线收发单元待发送的数据进行赋形加权处理。
12、 如权利要求 10所述的中心控制器， 其特征在于， 所述确定单元进一 步用于根据所述信道状态信息， 确定向终端发送的数据流数目；
所述处理单元进一步用于根据所述数据流数目和所述信道状态信息进行 数据处理。
13、 一种分布式天线系统， 其特征在于， 包括：
多个无线收发单元， 用于测量接收的终端导频信号功率并发送； 以及， 进行下行数据发送；
中心控制器， 用于根据多个所述无线收发单元发送的终端导频信号功率， 选择向终端发送数据的无线收发单元集合； 根据所述无线收发单元集合进行 数据处理； 将处理后的数据分发至所述无线收发单元集合中的无线收发单元。
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