WO2017152405A1 - 一种传输分集方法、设备及系统 - Google Patents

一种传输分集方法、设备及系统 Download PDF

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Publication number
WO2017152405A1
WO2017152405A1 PCT/CN2016/076044 CN2016076044W WO2017152405A1 WO 2017152405 A1 WO2017152405 A1 WO 2017152405A1 CN 2016076044 W CN2016076044 W CN 2016076044W WO 2017152405 A1 WO2017152405 A1 WO 2017152405A1
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Prior art keywords
data
network device
symbol
precoding matrix
data symbol
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PCT/CN2016/076044
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English (en)
French (fr)
Inventor
刘鹍鹏
吴强
张雷鸣
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华为技术有限公司
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Priority to CN201680083366.7A priority Critical patent/CN108781100B/zh
Priority to PCT/CN2016/076044 priority patent/WO2017152405A1/zh
Priority to EP16893056.8A priority patent/EP3419190A4/en
Publication of WO2017152405A1 publication Critical patent/WO2017152405A1/zh
Priority to US16/125,276 priority patent/US10560162B2/en

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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
    • H04B7/0456—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
    • H04B7/0486—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting taking channel rank into account
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H04B7/0417—Feedback systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • 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
    • 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
    • H04B7/0689—Hybrid systems, i.e. switching and simultaneous transmission using different transmission schemes, at least one of them being a diversity transmission scheme
    • 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
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0026—Division using four or more dimensions
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
    • H04B7/0621—Feedback content
    • H04B7/0626—Channel coefficients, e.g. channel state information [CSI]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0667—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of delayed versions of same signal
    • H04B7/0669—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of delayed versions of same signal using different channel coding between antennas
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0667—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of delayed versions of same signal
    • H04B7/0671—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of delayed versions of same signal using different delays between antennas
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/068—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission using space frequency diversity

Definitions

  • the present invention relates to the field of communications technologies, and in particular, to a transmission diversity method, device, and system.
  • the communication between the base station and the base station includes back haul and front haul link communication, wherein the backward backhaul refers to the base station controller to the serving gateway or the mobility management entity.
  • the forward backhaul refers to the network between the baseband processing unit (BBU) of the antenna and the base station controller.
  • BBU baseband processing unit
  • the backward backhaul and forward backhaul have very high reliability requirements, for example, the packet error rate (PER) requirement of the backward backhaul is 10 -6 , and the packet error rate of the forward backhaul is The higher requirements are 10 -8 , and the link communication of backward backhaul and forward back is usually deployed at high frequencies, and the high frequency space loss is large, so the transmission reliability in high frequency environment is proposed. higher requirement.
  • the diversity scheme is mainly used to improve the reliability of transmission.
  • the basic idea of diversity is that if multiple independent fading signals can be transmitted, the statistical signal fading is much lower than that of each channel statistic in statistical terms. Because under the assumption of independent fading, when some signals are deeply fading, the fading of other signals may be lighter, and the probability of simultaneous deep fading of each signal is very low, so the probability of deep fading of the synthesized signal is also greatly reduce.
  • the diversity scheme includes Space Time Coding (STC), Cyclic Delay Diversity (CDD), and antenna handover diversity, and more diversity schemes used in Long Term Evolution (LTE). It is a diversity scheme combining Space Frequency Block Code (SFBC) coding or SFBC and Frequency Switch Transmit Diversity (FSTD).
  • STC Space Time Coding
  • CDD Cyclic Delay Diversity
  • LTE Long Term Evolution
  • SFBC Space Frequency Block Code
  • FSTD Frequency Switch Transmit Diversity
  • the transmitted data packet is first subjected to scrambling, modulation, SFBC encoder, resource element mapper, and Orthogonal Frequency Division Multiplexing (OFDM) signal.
  • the generator processes and finally sends data through the antenna port.
  • the data symbols flowing into the SFBC encoder are x 2k and x 2k+1 , and then the first subcarrier of the antenna 1 transmits x 2k and the second subcarrier transmits x 2k .
  • the diversity scheme improves the reliability of transmission by transmitting duplicate data in frequency and space, thereby improving the reliability of receiving information by user equipment.
  • the antenna scheme of the diversity scheme has low gain, which cannot overcome the space loss and seriously affects the transmission reliability.
  • the embodiment of the invention provides a transmission diversity method and device, which combines diversity coding and precoding with space frequency block coding to improve antenna gain, thereby reducing spatial loss and improving data transmission reliability.
  • a first aspect of the embodiments of the present invention provides a transmission diversity method, including:
  • the first network device receives the rank index information and the precoding matrix index information sent by the second network device;
  • the first network device performs transmission processing according to the diversity coding manner and the precoding matrix to be transmitted data.
  • the first aspect of the embodiment of the present invention combines diversity coding and precoding similar to the space frequency block coding, thereby improving antenna gain, thereby reducing spatial loss and improving data transmission reliability.
  • the first network device determines The diversity coding mode is the first diversity coding mode; and/or, if the rank index information is the second preset rank 4, the first network device determines that the diversity coding mode is the second diversity coding mode.
  • a first possible implementation manner of the first aspect of the embodiments of the present invention provides two rank and two diversity coding modes, and different diversity coding modes are determined according to different ranks.
  • the first network device is configured according to the diversity coding manner and the method according to the first possible implementation manner of the first aspect of the embodiments of the present disclosure.
  • the specific process of the precoding matrix to continue the transmission processing of the transmitted data is:
  • the first network device processes the first data according to the diversity coding manner to obtain second data
  • the first network device performs precoding processing on the second data according to the precoding matrix to obtain third data
  • the first network device performs resource block mapping, OFDM signal generation processing, and transmission on the third data.
  • a second possible implementation manner of the first aspect of the embodiments of the present invention is to combine the diversity coding and the precoding with the space frequency block coding to obtain the SFBC diversity gain and the precoding for the complete process of the transmission process.
  • Gain which increases antenna gain.
  • the first diversity coding mode is:
  • X 2k, 1 represents the data symbol of the first layer data mapped on the 2kth subcarrier, corresponding to the data symbol d(2k) of the first data;
  • X 2k+1, 1 indicates that the first layer data is at the 2k+1 a data symbol of the subcarrier mapping, corresponding to the data symbol of the first data -(d(2k+1)) * ;
  • X 2k, 2 represents a data symbol of the second layer data mapped on the 2kth subcarrier, corresponding to the The data symbol d(2k+1) of the first data;
  • X 2k+1, 2 represents the data symbol of the second layer data mapped on the 2k+1th subcarrier, and the data symbol corresponding to the first data (d( 2k)) * ;
  • the data symbol of the second data is represented as X;
  • the first diversity coding mode is:
  • X 2k, 1 represents the data symbol of the first layer data mapped on the 2kth subcarrier, corresponding to the data symbol d(2k) of the first data;
  • X 2k+1, 1 indicates that the first layer data is at the 2k+1 a data symbol of the subcarrier mapping, corresponding to the data symbol d(2k+1) of the first data;
  • X 2k, 2 represents a data symbol mapped by the second layer of data on the 2kth subcarrier, corresponding to the first data
  • X 2k+1,2 represents the data symbol of the second layer data mapped on the 2k+1th subcarrier, and the data symbol corresponding to the first data (d( 2k)) * ;
  • the data symbol of the second data is represented as X.
  • the second diversity coding mode is:
  • X 2k, 1 represents the data symbol of the first layer data mapped on the 2kth subcarrier, corresponding to the data symbol d(2k) of the first data;
  • X 2k+1, 2 indicates that the first layer data is at the 2k+1 a data symbol of the subcarrier mapping, corresponding to the data symbol d(2k+1) of the first data;
  • X 2k, 2 represents a data symbol mapped by the second layer of data on the 2kth subcarrier, corresponding to the first data
  • X 2k+1,2 represents the data symbol of the second layer data mapped on the 2k+1th subcarrier, and the data symbol corresponding to the first data (d( 2k)) * ;
  • X 2k, 3 represents the data symbol of the third layer data mapped on the 2kth subcarrier, corresponding to the data symbol d(2k+2) of the first data;
  • X 2k+1, 3 represents the third
  • the third possible implementation manner of the first aspect of the embodiment of the present invention, and the fourth possible implementation manner are specific processing procedures of two diversity coding modes, and SFBC diversity gain can be obtained.
  • d(2k) and d(2k+2) are the same Data and d(2k+1) and d(2k+3) are the same data, then there is duplicate data in the second data, which is beneficial to improve the reliability of data transmission; if d(2k) and d(2k) +2) For different data and d(2k+1) and d(2k+3) are different data, there is no duplicate data in the second data, which is beneficial to improve the efficiency of data transmission.
  • the first network device performs precoding processing on the second data according to the precoding matrix to obtain third data according to the precoding matrix;
  • a sixth possible implementation manner of the first aspect of the embodiment of the present invention is a process of a specific precoding process, so that a precoding gain is obtained.
  • a second aspect of the embodiments of the present invention provides another method for transmission diversity, including:
  • the second network device measures channel state information according to the pilot signal
  • the precoding matrix index information determines a precoding matrix, and performs transmission processing according to the diversity encoding manner and the precoding matrix to be transmitted data.
  • the first network device determines the diversity coding mode and the precoding matrix by sending the rank index information and the precoding matrix index information to the first network device, so that the first network device uses the space frequency block. Coding is combined with precoding.
  • the second network device sends the rank index information and the precoding matrix index information to the first network device.
  • the process is:
  • the second network device selects a precoding matrix from the preset precoding codebook according to the channel state information
  • the second network device determines precoding matrix index information according to the precoding matrix, and sends the precoding matrix index information to the first network device.
  • a third aspect of the embodiment of the present invention provides a first network device, including:
  • An information receiving unit configured to receive rank index information and precoding matrix index information sent by the second network device
  • a mode determining unit configured to determine a diversity coding mode according to the rank index information
  • a matrix determining unit configured to determine a precoding matrix according to the precoding matrix index information
  • a transmission processing unit configured to transmit the number according to the diversity coding mode and the precoding matrix According to the transmission processing.
  • the first network device provided by the third aspect of the embodiment of the present invention is used to implement the transmission diversity method provided by the first aspect of the embodiment of the present invention, and details are not described herein again.
  • a fourth aspect of the embodiments of the present invention provides a second network device, including:
  • An information measuring unit configured to measure channel state information according to the pilot signal
  • An information sending unit configured to send rank index information and precoding matrix index information to the first network device according to the channel state information, so that the first network device determines a diversity coding manner according to the rank index information, according to the
  • the precoding matrix index information determines a precoding matrix, and performs transmission processing according to the diversity encoding manner and the precoding matrix to be transmitted data.
  • the second network device provided by the fourth aspect of the present invention is used to implement the transmission diversity method provided by the second aspect of the embodiments of the present invention, and details are not described herein again.
  • a fifth aspect of the embodiments of the present invention provides another first network device, where the first network device includes a receiver, a transmitter, a memory, and a processor, wherein the memory stores a set of program codes, and the processor is configured to call the memory.
  • the program code stored in the first network device is configured to perform the transmission diversity method provided in Embodiment 1 of the present invention.
  • a sixth aspect of the embodiments of the present invention provides another second network device, where the second network device includes an input module, an output module, a memory, and a processor, wherein the memory stores a set of program codes, and the processor is configured to call the memory.
  • the program code stored in the second network device is configured to perform the transmission diversity method provided by the second embodiment of the present invention.
  • a seventh aspect of the embodiments of the present invention provides a transmission diversity system, which includes the first network device provided by the third aspect of the embodiment of the present invention, and the second network device provided by the fourth aspect, or the fifth aspect provided by the fifth aspect of the embodiment of the present invention.
  • a network device and a second network device provided by the sixth aspect are examples of the transmission diversity system.
  • the channel state information is measured according to the pilot signal by the second network device, and the rank index information and the precoding matrix index information are sent to the first network device; the first network device receives the rank sent by the second network device.
  • the combination of diversity coding and precoding with space-frequency block coding improves antenna gain, thereby reducing spatial loss and improving data transmission reliability.
  • FIG. 1 is a schematic flowchart of a diversity transmission scheme adopted in existing LTE
  • FIG. 2 is a schematic flowchart of a transmission diversity method according to Embodiment 1 of the present invention.
  • FIG. 3 is a schematic flowchart of a diversity transmission scheme according to an embodiment of the present invention.
  • FIG. 4 is a schematic flowchart of a transmission diversity method according to Embodiment 2 of the present invention.
  • FIG. 5 is a schematic flowchart of a transmission diversity method according to Embodiment 3 of the present invention.
  • FIG. 6 is a schematic structural diagram of a first network device according to an embodiment of the present disclosure.
  • FIG. 7 is a schematic structural diagram of a second network device according to an embodiment of the present disclosure.
  • FIG. 8 is a schematic structural diagram of another first network device according to an embodiment of the present disclosure.
  • FIG. 9 is a schematic structural diagram of another second network device according to an embodiment of the present invention.
  • the embodiment of the present invention provides a transmission diversity method, device, and system, which can be applied to a scenario in which data is transmitted in a high frequency environment.
  • the second network device measures channel state information according to the pilot signal, and according to the channel state information,
  • the first network device sends the rank index information and the precoding matrix index information;
  • the first network device receives the rank index information and the precoding matrix index information that are sent by the second network device according to the channel state information; Determining, by the first network device, a diversity coding mode according to the rank index information; the first network device determining, according to the precoding matrix index information, a precoding matrix; the first network device according to the diversity coding mode and the The scenario in which the precoding matrix performs diversity transmission processing on the data to be transmitted.
  • the embodiment of the present invention improves the space-frequency block coding and increases the pre-coding in the existing diversity scheme, and combines the diversity coding similar to the space-frequency block coding with the pre-coding to obtain the SFBC diversity gain and the pre-coding gain simultaneously. Increased antenna gain and thus reduced Space loss, improve the reliability of data transmission.
  • the first network device in the embodiment of the present invention is a part or all of the base station, and the base station may be a base station in any network scenario.
  • the second network device in the embodiment of the present invention is a user equipment, and may include, but is not limited to, a mobile device, a tablet computer, a wristband, a watch, a smart wearable device, and the like.
  • a precondition for implementing the embodiments of the present invention is that the base station configures a new transmission mode for the second network device, that is, a transmission mode combining diversity coding and precoding similar to the space frequency block coding.
  • the transmission diversity system in the example of the present invention includes a first network device and a second network device.
  • the number of the second network devices may be more than one.
  • the embodiment of the present invention introduces a second network device in the system.
  • the implementation manner of the other second network device is the same as the second network device in the embodiment of the present invention.
  • the second network device in the embodiment of the present invention is within the network coverage of the base station corresponding to the first network device, and the communication process of the second network device is controlled by the base station, where the base station may be the second network device Allocating transmission resources, channels, etc., and transmitting information to the second network device through an antenna port of the base station.
  • Embodiment 1 of the present invention is a schematic flowchart of a diversity transmission method according to Embodiment 1 of the present invention. As shown in FIG. 2, the method provided in Embodiment 1 of the present invention may include the following contents of 101-106.
  • the second network device measures channel state information according to the pilot signal.
  • the first network device sends a guide to the second network device by using an air interface between the first network device and the second network device.
  • Frequency signal so that the second network device measures channel state information according to the pilot signal, and sends rank index information and precoding matrix index information to the first network device.
  • the pilot signal is a signal transmitted for the purpose of measurement or monitoring in the telecommunication network, and is transmitted through a physical channel.
  • the pilot signal may be sent by the first network device, or may be sent by a base station to which the first network device belongs.
  • the pilot signal shown may be a Channel State Indication Reference Signal (CSI-RS), which is a periodically transmitted pilot signal.
  • CSI-RS Channel State Indication Reference Signal
  • the channel state information is measured according to the pilot signal.
  • the channel state information may include a channel quality indicator (CQI), a precoding matrix index (PMI), a rank index (RI), and the like.
  • CQI is a measurement standard of communication quality of a wireless channel.
  • a CQI can be a so-called one value (or multiple values) of a channel measurement standard representing a given channel.
  • a high value CQI can indicate that a channel has a high quality and vice versa.
  • the PMI is used to indicate the precoding matrix.
  • Precoding is an adaptive technique in a multi-antenna system, that is, the second network device determines a PMI according to the channel state information, and then determines a precoding matrix according to the PMI. And storing, by the first network device and the second network device, a codebook including a plurality of precoding matrices, so that the second network device may select one of the pre-prepared according to the estimated channel matrix and a certain criterion. Encoding the matrix and transmitting its index value and the quantized channel state information to the first network device. After the first network device sends the pilot signal to the second network device again after receiving the PMI sent by the second network device, the second network device re-measures the channel state information. And determining a new PMI and a new precoding matrix, and transmitting a new PMI to the first network device, the first network device re-determining the precoding matrix according to the new PMI.
  • the RI represents the rank in the antenna matrix in a Multiple-Input Multiple-Output (MIMO) system, and if RI is N, it represents N parallel valid data streams.
  • the data stream used for actual transmission in a MIMO system is called the number of layers.
  • the RI may represent a correlation between a plurality of transport channels between the first network device and the second network device. If the RI is 1, it means that the multiple transmission paths are completely related, and the transmitted signals are likely to interfere with each other, making it difficult for the second network device to receive accurately. If the RI is greater than 1, it indicates that there are multiple independent uncorrelated channels, and the second network device can receive signals on different paths and independently or jointly decode according to precoding rules, thereby increasing transmission reliability and increasing channel capacity.
  • the second network device sends rank index information and precoding matrix index information to the first network device according to the channel state information.
  • the second network device extracts the rank index information and the precoding matrix index information in the measured channel state information, and passes the rank index information and the precoding matrix index information to the second
  • An air interface between the network device and the first network device is sent to the first network device.
  • the second network device may be sent to the first network device periodically, or may be sent to the first network device aperiodically, depending on the specific situation, and the specific sending period is not here. Make a limit.
  • the second network device sends all the measured channel state information to the first network device. In the embodiment of the present invention, only the rank index information and the precoding matrix index information in the channel state information are required, and the present invention is implemented.
  • the rank index information in the example is the first preset rank 2 or the second preset rank 4, and the current rank index information may be not only the first preset rank 2 or the second preset rank 4, It is also possible to have other ranks, so it is necessary to traverse a plurality of ranks and then determine the ranks sent to the first network device, and the ranks in the embodiment of the present invention are two, which can save operation time on a certain procedure.
  • the second network device selects a precoding matrix from the preset precoding codebook according to the channel state information, where the second network device determines the precoding matrix index information according to the precoding matrix, And transmitting the precoding matrix index information to the first network device.
  • the preset precoding codebook is stored in the second network device and the first network device, and the second network device determines the precoding matrix index information according to the preset precoding codebook, The first network device determines, according to the preset precoding codebook, a precoding codebook corresponding to the precoding matrix index information.
  • the first network device receives the rank index information and the precoding matrix index information that are sent by the second network device according to the channel state information.
  • the first network device receives, by using an air interface between the second network device and the first network device, the rank index information and the information that are sent by the second network device according to the channel state information. Precoding matrix index information.
  • the first network device determines a diversity coding manner according to the rank index information.
  • the first network device determines whether the received rank index information is the first preset rank 2 or the second preset rank 4, and determines a diversity coding manner according to the judgment result.
  • the diversity coding mode is similar to the SFBC coding shown in FIG. 1, but the SFBC coding in FIG.
  • the diversity coding mode is the two spatial frequency block coding matrices in Figure 3.
  • the data symbols of the first row of the first matrix are x 2k and x 2k+1
  • the data symbols of the first row of the second matrix are x. 2k+2 and x 2k+3
  • x 2k and x 2k+2 may represent data symbols of the same data, and may also indicate that data symbols of different data are different
  • x 2k+1 and x 2k+3 may represent data of the same data Symbols may also indicate that the data symbols of different data are different.
  • the first network device controls the switch to be disconnected, so that the air frequency block coding matrix flows into the matrix.
  • the data layer number is two layers; when the rank index information is the second preset rank 4, the first network device controls the switch to be closed, so that the number of data layers flowing into the space frequency block coding matrix is four layers. It can be understood that the first network device controls the opening or closing of the switch according to the rank index information, thereby determining a diversity coding manner.
  • the first network device determines that the diversity coding mode is a first diversity coding mode, where the first diversity coding mode is two layers of data. Diversity coding method.
  • the first network device determines that the diversity transmission mode is a second diversity coding mode, and the second diversity coding mode is four layers of data. Diversity coding method.
  • the first network device determines a precoding matrix according to the precoding matrix index information.
  • the first network device determines a precoding matrix according to the precoding matrix index information sent by the second network device, that is, determines a precoding matrix used by the precoding in FIG. 3.
  • Precoding can be divided into linear precoding and nonlinear precoding.
  • the linear precoding can be decoded by some linear detection means at one end of the receiving channel state information, mainly including linear zero forcing (including beamforming method, etc.), channel inversion and the like.
  • the nonlinear precoding design is complex, and the common contaminant paper coding usually requires processing N related nonlinear equations. Because the nonlinear complexity is high and the decoding algorithm is complex, the linear precoding technique is adopted in LTE, and the linear precoding technique is also adopted in the embodiment of the present invention. Linear precoding operations can be expressed as:
  • W is a precoding matrix
  • X is transmission data, that is, input precoded data
  • Y is a new transmission vector obtained by precoding processing of the transmission information, that is, precoded output data.
  • the linear precoding operation can be divided into two types of precoding methods according to the obtained positions of the precoding matrix: a non-codebook based precoding operation and a codebook based precoding operation.
  • the precoding matrix is obtained at the base station.
  • the base station side uses the predicted channel state information CSI to calculate the precoding matrix.
  • the common precoding matrix calculation methods include singular value decomposition and uniform channel decomposition.
  • the non-codebook precoding method requires dedicated pilots, that is, data symbols and pilot symbols are used together for precoding operations, so that the UE only needs to estimate by channel.
  • the pre-coded equivalent channel is obtained, thereby facilitating data demodulation.
  • the precoding matrix is obtained at the user end.
  • the second network device uses the measured channel state information to perform selection of a precoding matrix in a predetermined precoding codebook, and transmits a sequence number (PMI) of the selected precoding matrix to the base station.
  • the precoding matrix codebook can be constructed in various ways, such as a codebook based on antenna selection, a codebook based on transmitting adaptive array mode, a codebook based on discrete Fourier transform, a random codebook, and the like.
  • the selection of the precoding matrix from the predetermined precoding matrix codebook may be based on both performance indicator based selection and quantization based selection.
  • the first network device selects a precoding matrix from the preset precoding codebook according to the precoding index information, thereby determining the precoding matrix.
  • the first network device performs transmission processing according to the diversity coding manner and the precoding matrix to be transmitted data.
  • the first network device performs transmission processing according to the determined diversity coding mode and the precoding matrix to be transmitted data.
  • the first network device encodes, scrambles, and modulates the data to be transmitted to obtain first data, where the data symbols of the data to be transmitted are represented as a(0),..., a(M symb -1) That is, the codeword in FIG. 3; the codeword is encoded and subjected to scrambling and modulation processing in FIG. 3 to obtain first data, and the data symbols of the first data are represented as d(0),...,d (M symb -1), M symb represents the number of data symbols of the data to be transmitted.
  • the specific coding mode and the scrambling mode are not limited in the embodiment of the present invention.
  • the modulation scheme is different, such as Physical Downlink Shared Channel (PDSCH), and the modulation scheme includes Quadrature Phase Shift Keyin (QPSK) and 16 Quadrature Amplitude Modulation ( Quadrature Amplitude Modulation, QAM), 64QAM.
  • QPSK Quadrature Phase Shift Keyin
  • QAM Quadrature Amplitude Modulation
  • Each codeword of the data to be transmitted is encoded, and the encoded data is scrambled to be transmitted on one physical channel.
  • the scrambling code data is modulated to generate complex modulated data symbols.
  • the first network device processes the first data according to the diversity coding manner to obtain second data.
  • Diversity coding maps complex modulated data symbols to one or more transport layers. If determined
  • the first coding mode is the first diversity coding mode, and the first network device processes the first data to obtain the second data by using the first diversity coding mode;
  • the first diversity coding mode is:
  • X 2k, 1 represents the data symbol of the first layer data mapped on the 2kth subcarrier, corresponding to the data symbol d(2k) of the first data;
  • X 2k+1, 1 indicates that the first layer data is at the 2k+1 a data symbol of the subcarrier mapping, corresponding to the data symbol of the first data -(d(2k+1)) * ;
  • X 2k, 2 represents a data symbol of the second layer data mapped on the 2kth subcarrier, corresponding to the The data symbol d(2k+1) of the first data;
  • X 2k+1, 2 represents the data symbol of the second layer data mapped on the 2k+1th subcarrier, and the data symbol corresponding to the first data (d( 2k)) * ;
  • the data symbol of the second data is represented as X,
  • the first row of matrix X represents the 2kth subcarrier
  • the second row represents the 2k+1th subcarrier
  • the first column represents the first layer of data
  • the second column represents the second layer of data.
  • the first diversity coding mode is:
  • X 2k, 1 represents the data symbol of the first layer data mapped on the 2kth subcarrier, corresponding to the data symbol d(2k) of the first data;
  • X 2k+1, 1 indicates that the first layer data is at the 2k+1 a data symbol of the subcarrier mapping, corresponding to the data symbol d(2k+1) of the first data;
  • X 2k, 2 represents a data symbol mapped by the second layer of data on the 2kth subcarrier, corresponding to the first data
  • X 2k+1,2 represents the data symbol of the second layer data mapped on the 2k+1th subcarrier, and the data symbol corresponding to the first data (d( 2k)) * ;
  • the data symbol of the second data is represented as X,
  • the first column of the matrix X represents the 2kth subcarrier, and the second column represents the 2k+1th subcarrier, the first row table The first layer of data is shown, and the second row represents the second layer of data.
  • the first diversity coding mode is:
  • X 2k,1 represents the data symbol of the first layer data mapped on the 2kth subcarrier, corresponding to the data symbol d(2k+1) of the first data;
  • X 2k+1,1 indicates that the first layer data is at the 2k +1 subcarrier mapped data symbol, corresponding to the data symbol of the first data - (d(2k)) * ;
  • X 2k, 2 represents the data symbol of the second layer data mapped on the 2kth subcarrier, corresponding to said data symbol d (2k) of the first data;
  • X 2k + 1,2 denotes the second hierarchy data in the first data symbol 2k + 1 sub-carrier mapping, data corresponding to the first data symbols (d (2k + 1)) * ;
  • the data symbol of the second data is represented as X,
  • the first row of matrix X represents the 2kth subcarrier
  • the second row represents the 2k+1th subcarrier
  • the first column represents the first layer of data
  • the second column represents the second layer of data.
  • the first diversity coding mode is:
  • X 2k,1 represents the data symbol of the first layer data mapped on the 2kth subcarrier, corresponding to the data symbol d(2k+1) of the first data;
  • X 2k+1,1 indicates that the first layer data is at the 2k +1 subcarrier mapped data symbol corresponding to the data symbol d(2k) of the first data;
  • X 2k, 2 represents data symbols mapped by the second layer data on the 2kth subcarrier, corresponding to the first data
  • X 2k+1,2 represents the data symbol of the second layer data mapped on the 2k+1th subcarrier, and the data symbol corresponding to the first data (d(2k+) 1)) * ;
  • the data symbol of the second data is represented as X,
  • the first column of matrix X represents the 2kth subcarrier, and the second column represents the 2k+1th subcarrier, the first row represents the first layer of data, and the second row represents the second layer of data.
  • the second diversity coding mode is as follows:
  • X 2k, 1 represents the data symbol of the first layer data mapped on the 2kth subcarrier, corresponding to the data symbol d(2k) of the first data;
  • X 2k+1, 2 indicates that the first layer data is at the 2k+1 a data symbol of the subcarrier mapping, corresponding to the data symbol d(2k+1) of the first data;
  • X 2k, 2 represents a data symbol mapped by the second layer of data on the 2kth subcarrier, corresponding to the first data
  • X 2k+1,2 represents the data symbol of the second layer data mapped on the 2k+1th subcarrier, and the data symbol corresponding to the first data (d( 2k)) * ;
  • X 2k, 3 represents the data symbol of the third layer data mapped on the 2kth subcarrier, corresponding to the data symbol d(2k+2) of the first data;
  • X 2k+1, 3 represents the third
  • the first column of the matrix X represents the 2kth subcarrier
  • the second column represents the 2k+1th subcarrier
  • the first row represents the first layer data
  • the second row represents the second layer data
  • the third row represents the third layer data
  • the fourth line represents the fourth layer of data.
  • d(2k) and d(2k+2) are the same data and d(2k+1) and d(2k+3) are the same data, there is duplicate data in the second data, which is beneficial to improve The reliability of data transmission. If d(2k) If d(2k+2) is different data and d(2k+1) and d(2k+3) are different data, there is no duplicate data in the second data, which is beneficial to improve data transmission efficiency. .
  • the first network device performs precoding processing on the second data according to the determined precoding matrix to obtain third data, that is, performing precoding processing on each layer of complex modulated data symbols to obtain third data.
  • the number of rows of the precoding matrix is the number of antenna ports, and the number of columns is rank.
  • the first network device After the precoding process is completed, the first network device performs resource block mapping, OFDM signal generation processing, and transmission on the third data.
  • the resource block mapping process is performed by the resource element mapper in FIG. 3, and the OFDM signal generation process is performed by the OFDM signal generator in FIG.
  • the resource element mapper maps the precoded each layer of complex modulated data symbols to resource elements (k, l) in the physical resource block.
  • the OFDM signal generator modulates each layer of complex modulated data symbols processed by the resource element mapper into time domain OFDM data symbols.
  • the first network device transmits the data symbols processed by the OFDM signal generator through the antenna port in FIG.
  • the first network device may send the processed data to the second network device, or may send the data to other network devices.
  • the second network device performs OFDM demodulation on the data when receiving the data sent by the first network device through the antenna port.
  • the channel state information is measured according to the pilot signal by the second network device, and the rank index information and the precoding matrix index information are sent to the first network device according to the channel state information, where the first network device receives the second network.
  • the device performs rank index information and precoding matrix index information according to channel state information, and determines a diversity coding manner according to the rank index information, determines a precoding matrix according to the precoding matrix index information, and then treats according to the determined diversity coding manner and the precoding matrix.
  • the transmission data is transmitted and processed, thereby realizing the combination of diversity coding and precoding similar to the space frequency block coding, thereby improving the antenna gain, thereby reducing the space loss and improving the data transmission reliability.
  • FIG. 5 is a schematic flowchart of a diversity transmission method according to Embodiment 2 of the present invention. As shown in FIG. 5, the method provided in Embodiment 2 of the present invention may include the following 201-204.
  • the first network device receives the rank index information and the precoding matrix index information sent by the second network device.
  • the first network device receives the rank index information and the precoding moment sent by the second network device. Before the index information, the first network device sends a pilot signal to the second network device by using an air interface between the first network device and the second network device, so that the second network device Channel state information is measured according to the pilot signal, and rank index information and precoding matrix index information are transmitted to the first network device. There are a plurality of second network devices in the coverage of the base station to which the first network device belongs, and the first network device may send different pilot signals to the plurality of second network devices.
  • the first network device determines a diversity coding manner according to the rank index information.
  • the first network device determines whether the received rank index information is the first preset rank 2 or the second preset rank 4, and determines a diversity coding manner according to the judgment result.
  • the diversity coding mode is similar to the SFBC coding shown in FIG. 1, but the SFBC coding in FIG.
  • the diversity coding mode is the two spatial frequency block coding matrices in Figure 3.
  • the data symbols of the first row of the first matrix are x 2k and x 2k+1
  • the data symbols of the first row of the second matrix are x. 2k+2 and x 2k+3
  • x 2k and x 2k+2 may represent data symbols of the same data, and may also indicate that data symbols of different data are different
  • x 2k+1 and x 2k+3 may represent data of the same data Symbols may also indicate that the data symbols of different data are different.
  • the first network device controls the switch to be disconnected, so that the air frequency block coding matrix flows into the matrix.
  • the data layer number is two layers; when the rank index information is the second preset rank 4, the first network device controls the switch to be closed, so that the number of data layers flowing into the space frequency block coding matrix is four layers. It can be understood that the first network device controls the opening or closing of the switch according to the rank index information, thereby determining a diversity coding manner.
  • the first network device determines that the diversity coding mode is a first diversity coding mode, where the first diversity coding mode is two layers of data. Diversity coding method.
  • the first network device determines that the diversity transmission mode is a second diversity coding mode, and the second diversity coding mode is four layers of data. Diversity coding method.
  • the first network device determines a precoding matrix according to the precoding matrix index information.
  • the first network device determines a precoding matrix according to the precoding matrix index information sent by the second network device, that is, determines a precoding matrix used by the precoding in FIG. 3.
  • Precoding can be divided into linear precoding and nonlinear precoding.
  • the linear precoding can be decoded by some linear detection means at one end of the receiving channel state information, mainly including linear zero forcing (including beamforming method, etc.), channel inversion and the like.
  • the nonlinear precoding design is complex, and the common contaminant paper coding usually requires processing N related nonlinear equations. Because the nonlinear complexity is high and the decoding algorithm is complex, the linear precoding technique is adopted in LTE, and the linear precoding technique is also adopted in the embodiment of the present invention. Linear precoding operations can be expressed as:
  • W is a precoding matrix
  • X is transmission data, that is, input precoded data
  • Y is a new transmission vector obtained by precoding processing of the transmission information, that is, precoded output data.
  • the linear precoding operation can be divided into two types of precoding methods according to the obtained positions of the precoding matrix: a non-codebook based precoding operation and a codebook based precoding operation.
  • the precoding matrix is obtained at the base station.
  • the base station side uses the predicted channel state information CSI to calculate the precoding matrix.
  • the common precoding matrix calculation methods include singular value decomposition and uniform channel decomposition.
  • the non-codebook precoding method requires dedicated pilots, that is, data symbols and pilot symbols are used together for precoding operations, so that the UE only needs to obtain the precoded equivalent channel through channel estimation, thereby facilitating data solution. Tune.
  • the precoding matrix is obtained at the user end.
  • the second network device uses the measured channel state information to perform selection of a precoding matrix in a predetermined precoding codebook, and transmits a sequence number (PMI) of the selected precoding matrix to the base station.
  • the precoding matrix codebook can be constructed in various ways, such as a codebook based on antenna selection, a codebook based on transmitting adaptive array mode, a codebook based on discrete Fourier transform, a random codebook, and the like.
  • the selection of the precoding matrix from the predetermined precoding matrix codebook may be based on both performance indicator based selection and quantization based selection.
  • the first network device selects a precoding matrix from the preset precoding codebook according to the precoding index information, thereby determining the precoding matrix.
  • the first network device performs transmission processing according to the diversity coding manner and the precoding matrix to be transmitted data.
  • the first network device performs transmission processing according to the determined diversity coding mode and the precoding matrix to be transmitted data.
  • the first network device encodes, scrambles, and modulates the data to be transmitted to obtain first data, where the data symbols of the data to be transmitted are represented as a(0),..., a(M symb -1) That is, the codeword in FIG. 3; the codeword is encoded and subjected to scrambling and modulation processing in FIG. 3 to obtain first data, and the data symbols of the first data are represented as d(0),...,d (M symb -1), M symb represents the number of data symbols of the data to be transmitted.
  • the specific coding mode and the scrambling mode are not limited in the embodiment of the present invention.
  • the modulation scheme is different, such as Physical Downlink Shared Channel (PDSCH), and the modulation scheme includes Quadrature Phase Shift Keyin (QPSK) and 16 Quadrature Amplitude Modulation ( Quadrature Amplitude Modulation, QAM), 64QAM.
  • QPSK Quadrature Phase Shift Keyin
  • QAM Quadrature Amplitude Modulation
  • Each codeword of the data to be transmitted is encoded, and the encoded data is scrambled to be transmitted on one physical channel.
  • the scrambling code data is modulated to generate complex modulated data symbols.
  • the first network device processes the first data according to the determined diversity coding manner to obtain second data.
  • the first diversity coding mode is:
  • X 2k, 1 represents the data symbol of the first layer data mapped on the 2kth subcarrier, corresponding to the data symbol d(2k) of the first data;
  • X 2k+1, 1 indicates that the first layer data is at the 2k+1 a data symbol of the subcarrier mapping, corresponding to the data symbol of the first data -(d(2k+1)) * ;
  • X 2k, 2 represents a data symbol of the second layer data mapped on the 2kth subcarrier, corresponding to the The data symbol d(2k+1) of the first data;
  • X 2k+1, 2 represents the data symbol of the second layer data mapped on the 2k+1th subcarrier, and the data symbol corresponding to the first data (d( 2k)) * ;
  • the data symbol of the second data is represented as X,
  • the first row of matrix X represents the 2kth subcarrier
  • the second row represents the 2k+1th subcarrier
  • the first column represents the first layer of data
  • the second column represents the second layer of data.
  • the first diversity coding mode is:
  • X 2k, 1 represents the data symbol of the first layer data mapped on the 2kth subcarrier, corresponding to the data symbol d(2k) of the first data;
  • X 2k+1, 1 indicates that the first layer data is at the 2k+1 a data symbol of the subcarrier mapping, corresponding to the data symbol d(2k+1) of the first data;
  • X 2k, 2 represents a data symbol mapped by the second layer of data on the 2kth subcarrier, corresponding to the first data
  • X 2k+1,2 represents the data symbol of the second layer data mapped on the 2k+1th subcarrier, and the data symbol corresponding to the first data (d( 2k)) * ;
  • the data symbol of the second data is represented as X,
  • the first column of matrix X represents the 2kth subcarrier, and the second column represents the 2k+1th subcarrier, the first row represents the first layer of data, and the second row represents the second layer of data.
  • the first diversity coding mode is:
  • X 2k,1 represents the data symbol of the first layer data mapped on the 2kth subcarrier, corresponding to the data symbol d(2k+1) of the first data;
  • X 2k+1,1 indicates that the first layer data is at the 2k +1 subcarrier mapped data symbol, corresponding to the data symbol of the first data - (d(2k)) * ;
  • X 2k, 2 represents the data symbol of the second layer data mapped on the 2kth subcarrier, corresponding to The data symbol d(2k) of the first data;
  • X 2k+1, 2 represents the data symbol of the second layer data mapped on the 2k+1th subcarrier, and the data symbol corresponding to the first data (d(2k+) 1)) *;
  • data symbols of the second data is represented as X,
  • the first row of matrix X represents the 2kth subcarrier
  • the second row represents the 2k+1th subcarrier
  • the first column represents the first layer of data
  • the second column represents the second layer of data.
  • the first diversity coding mode is:
  • X 2k,1 represents the data symbol of the first layer data mapped on the 2kth subcarrier, corresponding to the data symbol d(2k+1) of the first data;
  • X 2k+1,1 indicates that the first layer data is at the 2k +1 subcarrier mapped data symbol corresponding to the data symbol d(2k) of the first data;
  • X 2k, 2 represents data symbols mapped by the second layer data on the 2kth subcarrier, corresponding to the first data data symbol - (d (2k)) * ;
  • X 2k + 1,2 denotes the second hierarchy data in the first data symbol 2k + 1 sub-carrier mapping, a corresponding data symbols (d (2k + to the first data 1)) * ;
  • the data symbol of the second data is represented as X,
  • the first column of matrix X represents the 2kth subcarrier, and the second column represents the 2k+1th subcarrier, the first row represents the first layer of data, and the second row represents the second layer of data.
  • the second diversity coding mode is as follows:
  • X 2k, 1 represents the data symbol of the first layer data mapped on the 2kth subcarrier, corresponding to the data symbol d(2k) of the first data;
  • X 2k+1, 2 indicates that the first layer data is at the 2k+1 a data symbol of the subcarrier mapping, corresponding to the data symbol d(2k+1) of the first data;
  • X 2k, 2 represents a data symbol mapped by the second layer of data on the 2kth subcarrier, corresponding to the first data data symbol - (d (2k + 1) ) *;
  • X 2k + 1,2 denotes the second hierarchy data in the first data symbol 2k + 1 sub-carriers mapped to the corresponding data symbols of the first data (D ( 2k)) * ;
  • X 2k, 3 represents the data symbol of the third layer data mapped on the 2kth subcarrier, corresponding to the data symbol d(2k+2) of the first data;
  • X 2k+1, 3 represents the third The
  • the first column of the matrix X represents the 2kth subcarrier
  • the second column represents the 2k+1th subcarrier
  • the first row represents the first layer data
  • the second row represents the second layer data
  • the third row represents the third layer data
  • the fourth line represents the fourth layer of data.
  • d(2k) and d(2k+2) are the same data and d(2k+1) and d(2k+3) are the same data, there is duplicate data in the second data, which is beneficial to improve The reliability of data transmission. If d(2k) and d(2k+2) are different data and d(2k+1) and d(2k+3) are different data, there is no duplicate data in the second data, which is beneficial to Improve the efficiency of data transmission.
  • the first network device performs precoding processing on the second data according to the determined precoding matrix to obtain third data, that is, performing precoding processing on each layer of complex modulated data symbols to obtain third data.
  • the number of rows of the precoding matrix is the number of antenna ports, and the number of columns is rank.
  • the first network device After the precoding process is completed, the first network device performs resource block mapping, OFDM signal generation processing, and transmission on the third data.
  • the resource block mapping process is performed by the resource element in FIG.
  • the prime mapper performs
  • the OFDM signal generation process is performed by the OFDM signal generator in FIG.
  • the resource element mapper maps the precoded each layer of complex modulated data symbols to resource elements (k, l) in the physical resource block.
  • the OFDM signal generator modulates each layer of complex modulated data symbols processed by the resource element mapper into time domain OFDM data symbols.
  • the first network device transmits the data symbols processed by the OFDM signal generator through the antenna port in FIG.
  • the first network device may send the processed data to the second network device, or may send the data to other network devices.
  • the second network device performs OFDM demodulation on the data when receiving the data sent by the first network device through the antenna port.
  • the first index is used to receive the rank index information and the precoding matrix index information sent by the second network device, determine a diversity coding manner according to the rank index information, and determine a precoding matrix according to the precoding matrix index information. And performing transmission processing according to the determined diversity coding mode and the precoding matrix to be transmitted, so that the first network device combines diversity coding and precoding similar to the space frequency block coding, and can obtain the SFBC diversity gain and the pre-acquisition.
  • the coding gain improves the antenna gain, which in turn reduces the space loss and improves the reliability of data transmission.
  • FIG. 6 is a schematic flowchart of a diversity transmission method according to Embodiment 3 of the present invention. As shown in FIG. 6, the method provided in Embodiment 3 of the present invention may include the following contents of 301 and 302.
  • the second network device measures channel state information according to the pilot signal.
  • the second network device receives the pilot signal sent by the first network device by using an air interface between the first network device and the second network device, and when receiving the pilot signal, according to The pilot signal measures the channel state information.
  • the second network device sends rank index information and precoding matrix index information to the first network device according to the channel state information.
  • the second network device extracts the rank index information and the precoding matrix index information in the measured channel state information, and passes the rank index information and the precoding matrix index information to the second
  • An air interface between the network device and the first network device is sent to the first network device.
  • the second network device may be sent to the first network device periodically, or may be sent to the first network device non-periodically, as the case may be.
  • the specific transmission period is not limited herein.
  • the second network device sends all the measured channel state information to the first network device. In the embodiment of the present invention, only the rank index information and the precoding matrix in the channel state information are required.
  • the information may be, and the rank index information in the embodiment of the present invention is the first preset rank 2 or the second preset rank 4, and the current rank index information may be not only the first preset rank 2 or The second preset rank 4 may also be other ranks. Therefore, it is necessary to traverse a plurality of ranks and then determine the rank sent to the first network device, but the rank in the embodiment of the present invention is two, and may be on a certain procedure. Save operating time.
  • the second network device selects a precoding matrix from the preset precoding codebook according to the channel state information, where the second network device determines the precoding matrix index information according to the precoding matrix, And transmitting the precoding matrix index information to the first network device.
  • the preset precoding codebook is stored in the second network device and the first network device, and the second network device determines the precoding matrix index information according to the preset precoding codebook, The first network device determines, according to the preset precoding codebook, a precoding codebook corresponding to the precoding matrix index information.
  • the specific processing flow can be seen in Figure 3.
  • the second network device may receive the processed data sent by the first network device, and the second network device receives the OFDM modulation, and the second network device receives the sent by the first network device.
  • the processed data is subjected to OFDM demodulation processing.
  • the pilot signal sent by the first network device is received by the second network device, and the channel state information is measured according to the pilot signal, and the rank index information is sent to the first network device according to the channel state information.
  • Precoding the matrix index information to cause the first network device to determine the diversity coding mode and the precoding matrix, thereby enabling the first network device to combine the space frequency block coding with the precoding.
  • FIG. 6 is a schematic structural diagram of a first network device according to an embodiment of the present invention.
  • the first network device 60 includes an information receiving unit 601, a mode determining unit 602, a matrix determining unit 603, and a transmission processing unit 604.
  • the information receiving unit 601 is configured to receive rank index information and precoding matrix index information sent by the second network device.
  • the mode determining unit 602 is configured to determine a diversity coding mode according to the rank index information.
  • the matrix determining unit 603 is configured to determine a precoding matrix according to the precoding matrix index information.
  • the data processing unit 604 is configured to perform transmission processing according to the diversity coding mode and the precoding matrix to be transmitted data.
  • the first network device shown in FIG. 6 is used to implement the embodiment shown in FIG. 4.
  • the basic idea and the beneficial effects are the same as those in FIG. 4, and details are not described herein again.
  • FIG. 7 is a schematic structural diagram of a second network device, where the second network device 70 includes an information measuring unit 701 and an information sending unit 702.
  • the information measuring unit 701 is configured to measure channel state information according to the pilot signal.
  • the information sending unit 702 is configured to send the rank index information and the precoding matrix index information to the first network device according to the channel state information, so that the first network device determines the diversity coding manner according to the rank index information, according to the
  • the precoding matrix index information determines a precoding matrix, and performs transmission processing according to the diversity coding mode and the precoding matrix to be transmitted data.
  • the first network device shown in FIG. 7 is used to implement the embodiment shown in FIG. 5.
  • the basic idea and the beneficial effects are the same as those in FIG. 5, and details are not described herein again.
  • the first network device shown in FIG. 6 is combined with the second network device shown in FIG. 7 for implementing the embodiment shown in FIG. 2.
  • FIG. 8 is a schematic structural diagram of another first network device according to an embodiment of the present invention.
  • the first network device includes at least one processor 801, at least one communication bus 802, a receiver 803, a transmitter 804, and a memory 805.
  • the communication bus 802 is used to implement connection communication between these components.
  • the receiver 803 and the transmitter 804 are collectively referred to as a transceiver station.
  • the transceiver station completes the conversion between the control of the base station and the wireless channel, and realizes that the communication signal of the user equipment is transmitted and received between the mobile platform and the mobile platform.
  • the processor 801 is responsible for all mobile communication interface management, mainly the allocation, release and management of wireless channels.
  • the processor 801 calls the program code stored in the memory 805 to perform a corresponding operation to implement the corresponding function.
  • the processor 801 is configured to control transmission of data.
  • the processor 801 includes a scrambling module, a modulation module, a diversity module, a precoding module, a resource block module, and an OFDM module, which respectively correspond to Scrambling, modulation, two matrices, precoding, resource element mapper, OFDM signal generator in FIG.
  • the processor 801 is configured to implement the mode determining unit of the embodiment shown in FIG.
  • the receiver 803 is configured to implement the information receiving unit of the embodiment shown in FIG. 6, and receive the rank index information and the precoding matrix index information sent by the second network device.
  • the transmitter is configured to transmit the processed data of the processor 801 to the user equipment in the coverage of the first network device, including the second network device, through the antenna port.
  • the antenna port of the first network device is not indicated in FIG.
  • FIG. 9 is a schematic structural diagram of another second network device according to an embodiment of the present invention.
  • the second network device includes: at least one processor 901, such as a CPU, at least one communication bus 902, an input device 903, an output device 904, a memory 905, a power module 906, and a wireless communication module 907.
  • the communication bus 902 is used to implement connection communication between these components.
  • the input device 903 is configured to receive an audio or video signal, and is further configured to receive an input command of the user and generate key input data according to the input command to control various operations of the second network device.
  • the output device 904 is configured to provide an output signal (eg, an audio signal, a video signal, an alarm signal, a vibration signal, etc.) in a visual, audio, and/or tactile manner, and the output device 904 can include a display unit, an audio output module, an alarm unit Etc., not shown in Figure 9.
  • the power module 906 receives external power or internal power under the control of the processor 901 and provides the required power to devices, modules, memory 905, processor 901, etc. on the communication bus 902.
  • the memory 905 may include at least one type of storage medium including a flash memory, a hard disk, a multimedia card, a card type memory (eg, SD or DX memory, etc.), a random access memory (RAM), static random access. Memory (SRAM), read only memory (ROM), electrically erasable programmable read only memory (EEPROM), programmable read only memory (PROM), magnetic memory, magnetic disk, optical disk, and the like.
  • the processor 901 typically controls the overall operation of the second network device, for example, the processor 901 performs the control and processing associated with voice calls, data communications, video calls, and the like.
  • the processor 901 is configured to implement the information measurement unit in the embodiment shown in FIG. 7, and measure channel state information according to the pilot signal.
  • the wireless communication module 907 is configured to transmit a radio signal to at least one of a base station (eg, an access point, a Node B, etc.), an external terminal, and a server, and/or a device that receives a radio signal therefrom.
  • a base station eg, an access point, a Node B, etc.
  • Such radio signals may include voice call signals, video call signals, or according to text Various types of data transmitted and/or received by the present and/or multimedia messages.
  • the wireless communication module 907 is configured to implement the information sending unit in the embodiment shown in FIG. 7 to send rank index information and precoding matrix index information to the first network device, so that the first network device determines according to the rank index information.
  • the diversity coding mode determines a precoding matrix according to the precoding matrix index information, and performs transmission processing according to the diversity coding mode and the precoding matrix to be transmitted data.
  • the wireless communication module 907 also includes an air interface, not shown in FIG. The air interface is for the second network device to communicate with other user equipment or the first network device.
  • the embodiment of the present invention further provides a transmission diversity system, including the first network device shown in FIG. 6 and the second network device shown in FIG. 7, or includes the first network device shown in FIG. 8 and FIG. The second network device.
  • the present invention can be implemented in hardware, firmware implementation, or a combination thereof.
  • the functions described above may be stored in or transmitted as one or more instructions or code on a computer readable medium.
  • the computer readable medium includes a computer storage medium and a communication medium, wherein the communication medium includes any medium that facilitates transfer of the computer program from one location to another. quality.
  • a storage medium may be any available media that can be accessed by a computer.
  • the computer readable medium may include a random access memory (RAM), a read-only memory (ROM), and an electrically erasable programmable read-only memory (Electrically Erasable Programmable).
  • EEPROM Electrically Error Read-Only Memory
  • CD-ROM Compact Disc Read-Only Memory
  • Any connection may suitably be a computer readable medium.
  • the software is transmitted from a website, server, or other remote source using coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL), or wireless technologies such as infrared, radio, and microwave, Then coaxial cable, fiber optic cable, twisted pair, DSL or wireless technologies such as infrared, wireless and microwave are included in the fixing of the associated medium.
  • DSL Digital Subscriber Line
  • a disk and a disc include a compact disc (CD), a laser disc, a compact disc, a digital versatile disc (DVD), a floppy disk, and a Blu-ray disc, wherein the disc is usually magnetically copied, and the disc is The laser is used to optically replicate the data. Combinations of the above should also be included within the scope of the computer readable media.

Abstract

一种传输分集方法、设备及系统，其中方法包括：第二网络设备根据导频信号测量信道状态信息并根据信道状态信息向第一网络设备发送秩索引信息和预编码矩阵索引信息；第一网络设备接收第二网络设备发送的秩索引信息和预编码矩阵索引信息；根据秩索引信息确定分集编码方式；根据预编码矩阵索引信息确定预编码矩阵；根据分集编码方式和预编码矩阵对待传输数据进行传输处理。本发明实施例将与空频块编码类似的分集编码与预编码相结合，能够提高天线增益，进而降低空间损耗，提高数据的传输可靠性。

Description

一种传输分集方法、设备及系统 技术领域
本发明涉及通信技术领域，尤其涉及一种传输分集方法、设备及系统。
背景技术
基站和基站之间的通信包括后向回传(back haul)和前向回传(front haul)的链路通信，其中，后向回传是指基站控制器到服务网关或移动性管理实体之间的网络，前向回传是指天线的基带处理单元(Building Base band Unit，BBU)到基站控制器之间的网络。由于后向回传和前向回传对可靠性要求非常高，例如，后向回传的分组错误率(Packet Error Rate，PER)的要求是10-6，而前向回传的分组错误率的要求更高是10-8，并且后向回传和前向回传的链路通信通常部署在高频下，高频的空间损耗很大，因此对高频环境下的传输可靠性提出了更高的要求。
目前，主要采用分集方案来提高传输的可靠性，分集的基本思想是，如果能够传输多个独立衰落的信号，从统计意义来说，合成的信号衰落比每一路信号衰落要降低很多，这是因为在独立衰落的假设下，当一些信号发生深衰落时，可能另一些信号的衰落较轻，各路信号同时发生深衰落的概率是很低的，从而合成信号发生深衰落的概率也被大大降低。分集方案包括空时编码(Space Time Coding，STC)、循环延时分集(Cyclic Delay Diversity，CDD)及天线切换分集等分集方案，长期演进(Long Term Evolution，LTE)中采用的比较多的分集方案是空频块编码(Space Frequency Block Code，SFBC)编码或SFBC与频率切换发送分集(Frequency Switch Transmit Diversity，FSTD)相结合的分集方案。如图1所示，为LTE中的SFBC分集方案，发送的数据包首先依次进行加扰、调制、SFBC编码器、资源元素映射器、正交频分复用(Orthogonal Frequency Division Multiplexing，OFDM)信号产生器处理，最后经过天线端口发送数据。其中，对于两发射天线的SFBC编码器，假设流入SFBC编码器的数据符号为x2k和x2k+1，则天线1的第1个子载波上分别传输x2k，第2个子载波上传输x2k+1，而天线2的第1个子载波上传输-x2k+1*，第2个子载波上传输x2k*，其中()*表示复数的共轭。该分集方案通过在频率和空间上发送重复的数据来提高传输的可靠性，从而提高用户设备接收信息的可靠性。 但是，对于空间损耗很大的高频环境，该分集方案的天线增益较低，无法克服空间损耗，严重影响传输可靠性。
发明内容
本发明实施例提供了一种传输分集方法及设备，将与空频块编码类似的分集编码与预编码相结合，能够提高天线增益，进而降低空间损耗，提高数据的传输可靠性。
本发明实施例第一方面提供一种传输分集方法，包括：
第一网络设备接收第二网络设备发送的秩索引信息和预编码矩阵索引信息；
所述第一网络设备根据所述秩索引信息确定分集编码方式；
所述第一网络设备根据所述预编码矩阵索引信息确定预编码矩阵；
所述第一网络设备根据所述分集编码方式和所述预编码矩阵对待传输数据进行传输处理。
本发明实施例第一方面将与空频块编码类似的分集编码与预编码相结合，能够提高天线增益，进而降低空间损耗，提高数据的传输可靠性。
基于本发明实施例第一方面，在本发明实施例第一方面的第一种可能实现的方式中，若所述秩索引信息为第一预设秩2，则所述第一网络设备确定所述分集编码方式为第一分集编码方式；和/或，若所述秩索引信息为第二预设秩4，则所述第一网络设备确定所述分集编码方式为第二分集编码方式。
本发明实施例第一方面的第一种可能实现的方式提供两种秩和两种分集编码方式，根据不同的秩确定不同的分集编码方式。
基于本发明实施例第一方面的第一种可能实现的方式，在本发明实施例第一方面的第二种可能实现的方式中，所述第一网络设备根据所述分集编码方式和所述预编码矩阵对待传输数据继续传输处理的具体流程为：
所述第一网络设备对待传输数据进行编码、加扰、调制处理得到第一数据；
所述第一网络设备根据所述分集编码方式对所述第一数据进行处理得到第二数据；
所述第一网络设备根据所述预编码矩阵对所述第二数据进行预编码处理得到第三数据；
所述第一网络设备对所述第三数据进行资源块映射、OFDM信号产生处理并发送。
本发明实施例第一方面的第二种可能实现的方式，为传输处理的完整流程，将与空频块编码类似的分集编码与预编码相结合，既能获得SFBC分集增益又能获得预编码增益，从而提高天线增益。
基于本发明实施例第一方面的第二种可能实现的方式，在本发明实施例第一方面的第三种可能实现的方式中，若所述分集编码方式为所述第一分集编码方式，则所述第一网络设备采用所述第一分集编码方式对所述第一数据进行处理得到第二数据，所述第一数据的数据符号为d(2k),2k＝0,1,...,Msymb-1，Msymb表示所述待传输数据的数据符号数；
其中，所述第一分集编码方式为：
X2k,1＝d(2k)  X2k,2＝d(2k+1)
X2k+1,1＝-(d(2k+1))*  X2k+1,2＝(d(2k))*
X2k,1表示第一层数据在第2k个子载波映射的数据符号，对应于所述第一数据的数据符号d(2k)；X2k+1,1表示第一层数据在第2k+1个子载波映射的数据符号，对应于所述第一数据的数据符号-(d(2k+1))*；X2k,2表示第二层数据在第2k个子载波映射的数据符号，对应于所述第一数据的数据符号d(2k+1)；X2k+1,2表示第二层数据在第2k+1个子载波映射的数据符号，对应于所述第一数据的数据符号(d(2k))*；所述第二数据的数据符号表示为X；
或，所述第一分集编码方式为：
X2k,1＝d(2k)  X2k+1,1＝d(2k+1)
X2k,2＝-(d(2k+1))*  X2k+1,2＝(d(2k))*
X2k,1表示第一层数据在第2k个子载波映射的数据符号，对应于所述第一数据的数据符号d(2k)；X2k+1,1表示第一层数据在第2k+1个子载波映射的数据符号，对应于所述第一数据的数据符号d(2k+1)；X2k,2表示第二层数据在第2k个子载波映射的数据符号，对应于所述第一数据的数据符号-(d(2k+1))*；X2k+1,2表示第二层数据在第2k+1个子载波映射的数据符号，对应于所述第一数据的数据符号(d(2k))*；所述第二数据的数据符号表示为X。
基于本发明实施例第一方面的第二种可能实现的方式，在本发明实施例第一方面的第四种可能实现的方式中，若所述分集编码方式为所述第二分集编码 方式，则所述第一网络设备采用所述第二分集编码方式对所述第一数据进行处理得到第二数据，所述第一数据的数据符号为d(2k),2k＝0,1,...,Msymb-1，Msymb表示所述待传输数据的数据符号数；
其中，所述第二分集编码方式为：
X2k,1＝d(2k)  X2k+1,1＝d(2k+1)
X2k,2＝-(d(2k+1))*  X2k+1,2＝(d(2k))*
X2k,3＝d(2k+2)  X2k+1,3＝d(2k+3)
X2k,4＝-(d(2k+3))*  X2k+1,4＝(d(2k+2))*
X2k,1表示第一层数据在第2k个子载波映射的数据符号，对应于所述第一数据的数据符号d(2k)；X2k+1,2表示第一层数据在第2k+1个子载波映射的数据符号，对应于所述第一数据的数据符号d(2k+1)；X2k,2表示第二层数据在第2k个子载波映射的数据符号，对应于所述第一数据的数据符号-(d(2k+1))*；X2k+1,2表示第二层数据在第2k+1个子载波映射的数据符号，对应于所述第一数据的数据符号(d(2k))*；X2k,3表示第三层数据在第2k个子载波映射的数据符号，对应于所述第一数据的数据符号d(2k+2)；X2k+1,3表示第三层数据在第2k+1个子载波映射的数据符号，对应于所述第一数据的数据符号d(2k+3)；X2k,4表示第四层数据在第2k个子载波映射的数据符号，对应于所述第一数据的数据符号-(d(2k+3))*；X2k+1,4表示第二层数据在第2k+1个子载波映射的数据符号，对应于所述第一数据的数据符号(d(2k+2))*；所述第二数据的数据符号表示为X。
本发明实施例第一方面的第三种可能实现的方式、第四种可能实现的方式为两种分集编码方式的具体处理过程，可获得SFBC分集增益。
基于本发明实施例第一方面的第四种可能实现的方式，在本发明实施例第一方面的第五种可能实现的方式中，若d(2k)与d(2k+2)为相同的数据且d(2k+1)与d(2k+3)为相同的数据，则所述第二数据中存在重复的数据，有利于提高数据传输的可靠性；若d(2k)与d(2k+2)为不同的数据且d(2k+1)与d(2k+3)为不同的数据，则所述第二数据中不存在重复的数据，有利于提高数据传输的效率。
基于本发明实施例第一方面的第三种至第五种可能实现的方式，在本发明 实施例第一方面的第六种可能实现的方式中，所述第一网络设备根据所述预编码矩阵，按照预编码方式对所述第二数据进行预编码处理得到第三数据；
其中，所述预编码方式为：Y＝WX，W为所述预编码矩阵，X为所述第二数据的数据符号，Y为所述第三数据的数据符号。
本发明实施例第一方面的第六种可能实现的方式为具体预编码处理的过程，以使获取预编码增益。
本发明实施例第二方面提供另一种传输分集方法，包括：
第二网络设备根据导频信号测量信道状态信息；
所述第二网络设备根据所述信道状态信息向第一网络设备发送秩索引信息和预编码矩阵索引信息，以使所述第一网络设备根据所述秩索引信息确定分集编码方式，根据所述预编码矩阵索引信息确定预编码矩阵，并根据所述分集编码方式和所述预编码矩阵对待传输数据进行传输处理。
本发明实施例第二方面，通过向第一网络设备发送秩索引信息和预编码矩阵索引信息，以使第一网络设备确定分集编码方式和预编码矩阵，进而使得第一网络设备将空频块编码与预编码相结合。
基于本发明实施例第二方面，在本发明实施例第二方面的第一种可能实现的方式中，所述第二网络设备向第一网络设备发送秩索引信息和预编码矩阵索引信息的具体流程为：
所述第二网络设备根据所述信道状态信息向第一网络设备发送秩索引信息；
所述第二网络设备根据所述信道状态信息从预设预编码码本中选择预编码矩阵；
所述第二网络设备根据所述预编码矩阵确定预编码矩阵索引信息，并向所述第一网络设备发送所述预编码矩阵索引信息。
本发明实施例第三方面提供一种第一网络设备，包括：
信息接收单元，用于接收第二网络设备发送的秩索引信息和预编码矩阵索引信息；
方式确定单元，用于根据所述秩索引信息确定分集编码方式；
矩阵确定单元，用于根据所述预编码矩阵索引信息确定预编码矩阵；
传输处理单元，用于根据所述分集编码方式和所述预编码矩阵对待传输数 据进行传输处理。
本发明实施例第三方面提供的第一网络设备用于实现本发明实施例第一方面提供的传输分集方法，在此不再赘述。
本发明实施例第四方面提供一种第二网络设备，包括：
信息测量单元，用于根据导频信号测量信道状态信息；
信息发送单元，用于根据所述信道状态信息向第一网络设备发送秩索引信息和预编码矩阵索引信息，以使所述第一网络设备根据所述秩索引信息确定分集编码方式，根据所述预编码矩阵索引信息确定预编码矩阵，并根据所述分集编码方式和所述预编码矩阵对待传输数据进行传输处理。
本发明实施例第四方面提供的第二网络设备用于实现本发明实施例第二方面提供的传输分集方法，在此不再赘述。
本发明实施例第五方面提供另一种第一网络设备，所述第一网络设备包括接收机、发射机、存储器以及处理器，其中，存储器中存储一组程序代码，且处理器用于调用存储器中存储的程序代码，使得所述第一网络设备执行本发明实施例一提供的传输分集方法。
本发明实施例第六方面提供另一种第二网络设备，所述第二网络设备包括输入模块、输出模块、存储器以及处理器，其中，存储器中存储一组程序代码，且处理器用于调用存储器中存储的程序代码，使得所述第二网络设备执行本发明实施例二提供的传输分集方法。
本发明实施例第七方面提供一种传输分集系统，包括本发明实施例第三方面提供的第一网络设备和第四方面提供的第二网络设备，或本发明实施例第五方面提供的第一网络设备和第六方面提供的第二网络设备。
在本发明实施例中，通过第二网络设备根据导频信号测量信道状态信息，并向第一网络设备发送秩索引信息和预编码矩阵索引信息；第一网络设备接收第二网络设备发送的秩索引信息和预编码矩阵信息，并根据秩索引信息确定分集编码方式，根据预编码矩阵索引信息确定预编码矩阵，根据确定的分集编码方式和预编码矩阵索引信息对待传输数据进行传输处理，从而实现与空频块编码类似的分集编码与预编码的结合，提高天线增益，进而降低空间损耗，提高数据的传输可靠性。
附图说明
为了更清楚地说明本发明实施例或现有技术中的技术方案，下面将对实施例中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本发明的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。
图1为现有LTE中采用的分集传输方案的流程示意图；
图2为本发明实施例一提供的传输分集方法的流程示意图；
图3为本发明实施例提供的分集传输方案的流程示意图；
图4为本发明实施例二提供的传输分集方法的流程示意图；
图5为本发明实施例三提供的传输分集方法的流程示意图；
图6为本发明实施例提供的一种第一网络设备的结构示意图；
图7为本发明实施例提供的一种第二网络设备的结构示意图；
图8为本发明实施例提供的另一种第一网络设备的结构示意图；
图9为本发明实施例提供的另一种第二网络设备的结构示意图。
具体实施方式
下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有作出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。
本发明实施例提供一种传输分集方法、设备及系统，可以应用于高频环境下传输数据的场景，例如，第二网络设备根据导频信号测量信道状态信息，并根据所述信道状态信息向所述第一网络设备发送秩索引信息和预编码矩阵索引信息；所述第一网络设备接收所述第二网络设备根据信道状态信息发送的所述秩索引信息和所述预编码矩阵索引信息；所述第一网络设备根据所述秩索引信息确定分集编码方式；所述第一网络设备根据所述预编码矩阵索引信息确定预编码矩阵；所述第一网络设备根据所述分集编码方式和所述预编码矩阵对待传输数据进行分集传输处理的场景。本发明实施例在现有的分集方案上改进了空频块编码并增加了预编码，将与空频块编码类似的分集编码与预编码相结合，能够同时获得SFBC分集增益和预编码增益，提高了天线增益，进而降低 空间损耗，提高数据的传输可靠性。
本发明实施例中的第一网络设备为基站的一部分或全部，所述基站可以是任意网络场景中的基站。本发明实施例中的第二网络设备为用户设备，可以包括但不限于手机、平板电脑、手环、手表、智能可穿戴设备等具有通信功能的电子设备。实施本发明实施例的前提条件是基站为第二网络设备配置了一种新的传输模式，即与空频块编码类似的分集编码与预编码相结合的传输模式。
本发明实例中的传输分集系统包括第一网络设备和第二网络设备，在该系统中，第二网络设备的数量可能不止一个，本发明实施例对该系统中的一个第二网络设备进行介绍，其它第二网络设备的实现方式与本发明实施例中的第二网络设备相同。本发明实施例中的第二网络设备在所述第一网络设备对应的基站的网络覆盖范围内，所述第二网络设备的通信过程受该基站控制，该基站可以为所述第二网络设备分配传输资源、信道等，并通过该基站的天线端口向所述第二网络设备发送信息。
下面将结合图2至图6，对本发明实施例提供的分集传输方法进行详细的介绍。
请参见图2，为本发明实施例一提供的分集传输方法的流程示意图，如图2所示，本发明实施例一提供的方法可以包括下述101-106的内容。
101，第二网络设备根据导频信号测量信道状态信息。
具体的，在第二网络设备根据导频信号测量信道状态信息之前，第一网络设备通过所述第一网络设备与所述第二网络设备之间的空中接口向所述第二网络设备发送导频信号，以使所述第二网络设备根据所述导频信号测量信道状态信息，并向所述第一网络设备发送秩索引信息和预编码矩阵索引信息。其中，所述导频信号为在电信网内为测量或监控的目的而发送的信号，通过物理信道传输。所述导频信号可以由所述第一网络设备发送，也可以由所述第一网络设备所属的基站发送。所示导频信号可以为信道状态指示参考信号(Channel State Indication Reference Signal，CSI-RS)，CSI-RS是一种周期性发送的导频信号。
所述第二网络设备通过所述第一网络设备与所述第二网络设备之间的空中接口接收所述第一网络设备发送的所述导频信号，并在接收到所述导频信号 时根据所述导频信号测量所述信道状态信息。其中，所述信道状态信息可以包括信道质量指示符(Channel Quality Indicator，CQI)、预编码矩阵索引(Precoding Matrix Index，PMI)，秩索引(Rank Index，RI)等信息。
其中，CQI是无线信道的通信质量的测量标准。CQI能够是代表一个给定信道的信道测量标准所谓一个值(或多个值)。通常，一个高值的CQI可以表示一个信道有高的质量，反之亦然。
PMI用于指示预编码矩阵。预编码是多天线系统中的一种自适应技术，即所述第二网络设备根据所述信道状态信息确定PMI，进而根据PMI确定预编码矩阵。在所述第一网络设备、所述第二网络设备均存储一套包含若干个预编码矩阵的码本，这样所述第二网络设备可以根据估计出的信道矩阵和某一准则选择其中一个预编码矩阵，并将其索引值和量化后的信道状态信息发送给所述第一网络设备。若所述第一网络设备在接收到所述第二网络设备发送的PMI之后，再次向所述第二网络设备发送所述导频信号，则所述第二网络设备重新测量所述信道状态信息并确定新的PMI和新的预编码矩阵，并发送新的PMI至所述第一网络设备，所述第一网络设备根据新的PMI重新确定预编码矩阵。
RI在多输入多输出(Multiple-Input Multiple-Output，MIMO)系统中表示天线矩阵中的秩，若RI为N，则表示N个并行的有效的数据流。在MIMO系统中实际传送所使用的数据流称为层数。RI可以表示所述第一网络设备与所述第二网络设备之间多条传输信道之间的相关性。如果RI为1，则表示多条传输通路完全相关，所传送的信号之间很可能会互相干扰，使得所述第二网络设备难以准确接收。如果RI大于1，则表示有多条独立不相关信道，所述第二网络设备可以接收不同通路上的信号，并根据预编码规则独立或联合解码，从而增加传输可靠性，提高信道容量。
102，所述第二网络设备根据所述信道状态信息向所述第一网络设备发送秩索引信息和预编码矩阵索引信息。
具体的，所述第二网络设备提取测量到的所述信道状态信息中的秩索引信息和预编码矩阵索引信息，并将所述秩索引信息和所述预编码矩阵索引信息通过所述第二网络设备与所述第一网络设备之间的空中接口发送给所述第一网络设备。所述第二网络设备可以周期性地向所述第一网络设备发送，也可以非周期性地向所述第一网络设备发送，视具体情况而定，具体发送的周期在此不 做限定。目前，第二网络设备将测量到的所有信道状态信息全部发送给第一网络设备，本发明实施例中只需要信道状态信息中的秩索引信息和预编码矩阵索引信息即可，并且本发明实施例中的所述秩索引信息为第一预设秩2或第二预设秩4，而目前的秩索引信息不仅可以是所述第一预设秩2或所述第二预设秩4，还可能是其它的秩，因此需要遍历多个秩再确定发送给第一网络设备的秩，而本发明实施例中的秩就两个，可以在一定程序上节省操作时间。
可选的，所述第二网络设备根据所述信道状态信息从预设预编码码本中选择预编码矩阵，所述第二网络设备根据所述预编码矩阵确定所述预编码矩阵索引信息，并向所述第一网络设备发送所述预编码矩阵索引信息。在所述第二网络设备和所述第一网络设备均存储有所述预设预编码码本，所述第二网络设备根据所述预设预编码码本确定所述预编码矩阵索引信息，所述第一网络设备根据所述预设预编码码本确定所述预编码矩阵索引信息对应的预编码码本。
103，所述第一网络设备接收所述第二网络设备根据所述信道状态信息发送的所述秩索引信息和所述预编码矩阵索引信息。
具体的，所述第一网络设备通过所述第二网络设备与所述第一网络设备之间的空中接口接收所述第二网络设备根据所述信道状态信息发送的所述秩索引信息和所述预编码矩阵索引信息。
104，所述第一网络设备根据所述秩索引信息确定分集编码方式。
具体的，由于不同MIMO信道下数据通路之间的正交性不同，因此实际应用中必须考虑数据流之间所产生的干扰。采用多个天线传送多个码字时，需要根据空间信道的秩来确定所能同时发送的数据流数，即层数，以降低信息之间的干扰，增加接收准确性，提升信息传送容量。所述第一网络设备判断接收到的所述秩索引信息为所述第一预设秩2还是为所述第二预设秩4，并根据判断结果确定分集编码方式。请参见图3，所述分集编码方式为与图1所示的SFBC编码类似，但是图1中的SFBC编码只针对两层数据的编码，本发明实施例中的分集编码适用于两层数据的编码或四层数据的编码。分集编码方式即为图3中的两个空频块编码矩阵，第一个矩阵的第一行的数据符号为x2k和x2k+1，第二个矩阵的第一行的数据符号为x2k+2和x2k+3，x2k与x2k+2可能表示相同数据的数据符号，也可能表示不同数据的数据符号不相同；x2k+1和x2k+3可能表示相同数据的数据符号，也可能表示不同数据的数据符号不相同。 在调制与空频块编码矩阵之间存在一个开关，当所述秩索引信息为所述第一预设秩2时，所述第一网络设备控制该开关断开，使得流入空频块编码矩阵的数据层数为两层；当所述秩索引信息为所述第二预设秩4时，所述第一网络设备控制该开关闭合，使得流入空频块编码矩阵的数据层数为四层，可以理解的是，所述第一网络设备根据所述秩索引信息控制该开关的断开或闭合，进而确定分集编码方式。
可选的，若所述秩索引信息为所述第一预设秩2，则所述第一网络设备确定分集编码方式为第一分集编码方式，所述第一分集编码方式为两层数据的分集编码方式。
可选的，若所述秩索引信息为所述第二预设秩4，则所述第一网络设备确定分集传输模式为第二分集编码方式，所述第二分集编码方式为四层数据的分集编码方式。
105，所述第一网络设备根据所述预编码矩阵索引信息确定预编码矩阵。
具体的，所述第一网络设备根据所述第二网络设备发送的所述预编码矩阵索引信息确定预编码矩阵，即确定图3中的预编码所使用的预编码矩阵。预编码可以分为线性预编码和非线性预编码两种。线性预编码在接收信道状态信息的一端通过一些线性检测手段即可译码，主要有：线性迫零(包括波束成型方法等)、信道求逆等。非线性预编码设计复杂，常见的有污纸编码，通常需要对N个相关的非线性方程组做处理。因为非线性复杂度高，译码算法复杂，因此LTE中采用线性预编码技术，本发明实施例同样采用线性预编码技术。线性预编码操作可以表述为：
Y＝WX
其中，W是预编码矩阵，X为传输数据，即输入预编码的数据，Y为传输信息经过预编码处理之后得到的新的发射向量，即预编码输出的数据。
线性预编码操作可以按其预编码矩阵的获得位置划分为两大类预编码方式：基于非码本的预编码操作和基于码本的预编码操作。
在非码本的预编码方式中，预编码矩阵在基站端获得。基站端利用预测的信道状态信息CSI，进行预编码矩阵的计算，常见的预编码矩阵计算方法有奇异值分解，均匀信道分解等。非码本的预编码方式要求使用专用导频，即数据符号和导频符号一起进行预编码操作，这样用户端只需要通过信道估计就可以 获得预编码后的等效信道，从而方便进行数据解调。
在基于码本的预编码方式中，预编码矩阵在用户端获得。所述第二网络设备利用测量的信道状态信息，在预定的预编码码本中进行预编码矩阵的选择，并将选定的预编码矩阵的序号(PMI)发送给基站。预编码矩阵码本的构建方式有多种，如：基于天线选择的码本，基于发射自适应阵列模式的码本，基于离散傅里叶变换的码本，随机码本等。从预定的预编码矩阵码本中选择预编码矩阵可以依据基于性能指标的选择和基于量化的选择两种方式。
在本发明实施例中，所述第一网络设备根据所述预编码索引信息从预设预编码码本中选择预编码矩阵，从而确定所述预编码矩阵。
106，所述第一网络设备根据所述分集编码方式和所述预编码矩阵对待传输数据进行传输处理。
具体的，待所述分集编码方式和所述预编码矩阵确定后，所述第一网络设备根据确定的所述分集编码方式和所述预编码矩阵对待传输数据进行传输处理。所述第一网络设备对待传输数据进行编码、加扰、调制处理得到第一数据，其中，所述待传输数据的数据符号表示为a(0),...,a(Msymb-1)，即为图3中的码字；码字经过编码由图3中的加扰以及调制处理后得到第一数据，所述第一数据的数据符号表示为d(0),...,d(Msymb-1)，Msymb表示所述待传输数据的数据符号数。其中，码字可以为一个或两个码字，若为一个码字，则Msymb为该码字的数据符号数，即所述待传输数据包括多少个该码字；若为两个码字，则Msymb为这两个码字的数据符号数的总和，包括第一个码字的数据符号数Msymb (0)和第二个码字的数据符号数Msymb (1)，第一码字的数据符号表示为d(0)(i),i＝0,1,...,Msymb (0)，第二码字的数据符号表示为d(1)(i),i＝0,1,...,Msymb (1)。具体的编码方式、扰码方式在本发明实施例中不做限定。对于不同的下行信道，调制方式有所不同，例如物理下行共享信道(Physical Downlink Shared Channel，PDSCH)，调制方式有正交相移键控(Quadrature Phase Shift Keyin，QPSK)、16正交振幅调制(Quadrature Amplitude Modulation，QAM)、64QAM。对所述待传输数据的每个码字进行编码，对编码数据进行扰码，以使在一个物理信道上传输。对扰码数据进行调制，以生成复数调制数据符号。
所述第一网络设备根据确所述分集编码方式对所述第一数据进行处理得到第二数据。分集编码将复数调制数据符号映射到一个或多个传输层。若确定 的所述分集编码方式为所述第一分集编码方式，则所述第一网络设备采用所述第一分集编码方式对所述第一数据进行处理得到第二数据；
其中，所述第一分集编码方式为：
X2k,1＝d(2k)  X2k,2＝d(2k+1)
X2k+1,1＝-(d(2k+1))*  X2k+1,2＝(d(2k))*
X2k,1表示第一层数据在第2k个子载波映射的数据符号，对应于所述第一数据的数据符号d(2k)；X2k+1,1表示第一层数据在第2k+1个子载波映射的数据符号，对应于所述第一数据的数据符号-(d(2k+1))*；X2k,2表示第二层数据在第2k个子载波映射的数据符号，对应于所述第一数据的数据符号d(2k+1)；X2k+1,2表示第二层数据在第2k+1个子载波映射的数据符号，对应于所述第一数据的数据符号(d(2k))*；所述第二数据的数据符号表示为X，
Figure PCTCN2016076044-appb-000001
矩阵X的第一行表示第2k子载波，第二行表示第2k+1子载波，第一列表示第一层数据，第二列表示第二层数据。
或，所述第一分集编码方式为：
X2k,1＝d(2k)  X2k+1,1＝d(2k+1)
X2k,2＝-(d(2k+1))*  X2k+1,2＝(d(2k))*
X2k,1表示第一层数据在第2k个子载波映射的数据符号，对应于所述第一数据的数据符号d(2k)；X2k+1,1表示第一层数据在第2k+1个子载波映射的数据符号，对应于所述第一数据的数据符号d(2k+1)；X2k,2表示第二层数据在第2k个子载波映射的数据符号，对应于所述第一数据的数据符号-(d(2k+1))*；X2k+1,2表示第二层数据在第2k+1个子载波映射的数据符号，对应于所述第一数据的数据符号(d(2k))*；所述第二数据的数据符号表示为X，
Figure PCTCN2016076044-appb-000002
矩阵X的第一列表示第2k子载波，第二列表示第2k+1子载波，第一行表 示第一层数据，第二行表示第二层数据。
可选的，第一分集编码方式为：
X2k,1＝d(2k+1)  X2k,2＝d(2k)
X2k+1,1＝-(d(2k))*  X2k+1,2＝(d(2k+1))*
X2k,1表示第一层数据在第2k个子载波映射的数据符号，对应于所述第一数据的数据符号d(2k+1)；X2k+1,1表示第一层数据在第2k+1个子载波映射的数据符号，对应于所述第一数据的数据符号-(d(2k))*；X2k,2表示第二层数据在第2k个子载波映射的数据符号，对应于所述第一数据的数据符号d(2k)；X2k+1,2表示第二层数据在第2k+1个子载波映射的数据符号，对应于所述第一数据的数据符号(d(2k+1))*；所述第二数据的数据符号表示为X，
Figure PCTCN2016076044-appb-000003
矩阵X的第一行表示第2k子载波，第二行表示第2k+1子载波，第一列表示第一层数据，第二列表示第二层数据。
或，所述第一分集编码方式为：
X2k,1＝d(2k+1)  X2k+1,1＝d(2k)
X2k,2＝-(d(2k))*  X2k+1,2＝(d(2k+1))*
X2k,1表示第一层数据在第2k个子载波映射的数据符号，对应于所述第一数据的数据符号d(2k+1)；X2k+1,1表示第一层数据在第2k+1个子载波映射的数据符号，对应于所述第一数据的数据符号d(2k)；X2k,2表示第二层数据在第2k个子载波映射的数据符号，对应于所述第一数据的数据符号-(d(2k))*；X2k+1,2表示第二层数据在第2k+1个子载波映射的数据符号，对应于所述第一数据的数据符号(d(2k+1))*；所述第二数据的数据符号表示为X，
Figure PCTCN2016076044-appb-000004
矩阵X的第一列表示第2k子载波，第二列表示第2k+1子载波，第一行表示第一层数据，第二行表示第二层数据。
若确定的所述分集编码方式为所述第二分集编码方式，则所述第一网络设备采用所述第二分集编码方式对d(2k),2k＝0,1,...,Msymb-1进行处理得到第二数据；
其中，所述第二分集编码方式如下：
X2k,1＝d(2k)  X2k+1,1＝d(2k+1)
X2k,2＝-(d(2k+1))*  X2k+1,2＝(d(2k))*
X2k,3＝d(2k+2)  X2k+1,3＝d(2k+3)
X2k,4＝-(d(2k+3))*  X2k+1,4＝(d(2k+2))*
X2k,1表示第一层数据在第2k个子载波映射的数据符号，对应于所述第一数据的数据符号d(2k)；X2k+1,2表示第一层数据在第2k+1个子载波映射的数据符号，对应于所述第一数据的数据符号d(2k+1)；X2k,2表示第二层数据在第2k个子载波映射的数据符号，对应于所述第一数据的数据符号-(d(2k+1))*；X2k+1,2表示第二层数据在第2k+1个子载波映射的数据符号，对应于所述第一数据的数据符号(d(2k))*；X2k,3表示第三层数据在第2k个子载波映射的数据符号，对应于所述第一数据的数据符号d(2k+2)；X2k+1,3表示第三层数据在第2k+1个子载波映射的数据符号，对应于所述第一数据的数据符号d(2k+3)；X2k,4表示第四层数据在第2k个子载波映射的数据符号，对应于所述第一数据的数据符号-(d(2k+3))*；X2k+1,4表示第二层数据在第2k+1个子载波映射的数据符号，对应于所述第一数据的数据符号(d(2k+2))*；所述第二数据的数据符号表示为X，
Figure PCTCN2016076044-appb-000005
矩阵X的第一列表示第2k子载波，第二列表示第2k+1子载波，第一行表示第一层数据，第二行表示第二层数据，第三行表示第三层数据，第四行表示第四层数据。
若d(2k)与d(2k+2)为相同的数据且d(2k+1)与d(2k+3)为相同的数据，则所述第二数据中存在重复的数据，有利于提高数据传输的可靠性。若d(2k) 与d(2k+2)为不同的数据且d(2k+1)与d(2k+3)为不同的数据，则所述第二数据中不存在重复的数据，有利于提高数据传输的效率。
所述第一网络设备根据确定的所述预编码矩阵对所述第二数据进行预编码处理得到第三数据，即为对每层复数调制数据符号进行预编码处理得到第三数据。其中，所述预编码方式为：Y＝WX，W为确定的所述预编码矩阵，X为所述第二数据的数据符号，Y为所述第三数据的数据符号，分别对每层数据进行预编码处理。所述预编码矩阵的行数为天线端口数，列数为秩。
在完成预编码处理后，所述第一网络设备对所述第三数据进行资源块映射、OFDM信号产生处理并发送。其中，资源块映射处理由图3中的资源元素映射器执行，OFDM信号产生处理由图3中的OFDM信号产生器执行。资源元素映射器将预编码后的每层复数调制数据符号映射到物理资源块中的资源元素(k,l)。OFDM信号产生器将资源元素映射器处理后的每层复数调制数据符号调制成时域OFDM数据符号。所述第一网络设备通过图3中的天线端口发送OFDM信号产生器处理后的数据符号。所述第一网络设备可将处理后的数据发送至所述第二网络设备，也可发送至其他网络设备。所述第二网络设备在接收到所述第一网络设备通过天线端口发送的数据时，对数据进行OFDM解调。
在本发明实施例中，通过第二网络设备根据导频信号测量信道状态信息，并根据信道状态信息向第一网络设备发送秩索引信息和预编码矩阵索引信息，第一网络设备接收第二网络设备根据信道状态信息发送的秩索引信息和预编码矩阵索引信息，并根据秩索引信息确定分集编码方式，根据预编码矩阵索引信息确定预编码矩阵，然后根据确定的分集编码方式和预编码矩阵对待传输数据进行传输处理，从而实现与空频块编码类似的分集编码与预编码的结合，提高天线增益，进而降低空间损耗，提高数据的传输可靠性。
请参见图5，为本发明实施例二提供的分集传输方法的流程示意图，如图5所示，本发明实施例二提供的方法可以包括下述201-204的内容。
202，第一网络设备接收第二网络设备发送的秩索引信息和预编码矩阵索引信息。
具体的，在第一网络设备接收第二网络设备发送的秩索引信息和预编码矩 阵索引信息之前，所述第一网络设备通过所述第一网络设备与所述第二网络设备之间的空中接口向所述第二网络设备发送导频信号，以使所述第二网络设备根据所述导频信号测量信道状态信息，并向所述第一网络设备发送秩索引信息和预编码矩阵索引信息。所述第一网络设备所属基站的覆盖范围内存在多个第二网络设备，所述第一网络设备可向多个第二网络设备发送不同的导频信号。
所述第一网络设备通过所述第二网络设备与所述第一网络设备之间的空中接口接收所述第二网络设备根据所述信道状态信息发送的所述秩索引信息和所述预编码矩阵索引信息。
202，所述第一网络设备根据所述秩索引信息确定分集编码方式。
具体的，由于不同MIMO信道下数据通路之间的正交性不同，因此实际应用中必须考虑数据流之间所产生的干扰。采用多个天线传送多个码字时，需要根据空间信道的秩来确定所能同时发送的数据流数，即层数，以降低信息之间的干扰，增加接收准确性，提升信息传送容量。所述第一网络设备判断接收到的所述秩索引信息为所述第一预设秩2还是为所述第二预设秩4，并根据判断结果确定分集编码方式。请参见图3，所述分集编码方式为与图1所示的SFBC编码类似，但是图1中的SFBC编码只针对两层数据的编码，本发明实施例中的分集编码适用于两层数据的编码或四层数据的编码。分集编码方式即为图3中的两个空频块编码矩阵，第一个矩阵的第一行的数据符号为x2k和x2k+1，第二个矩阵的第一行的数据符号为x2k+2和x2k+3，x2k与x2k+2可能表示相同数据的数据符号，也可能表示不同数据的数据符号不相同；x2k+1和x2k+3可能表示相同数据的数据符号，也可能表示不同数据的数据符号不相同。在调制与空频块编码矩阵之间存在一个开关，当所述秩索引信息为所述第一预设秩2时，所述第一网络设备控制该开关断开，使得流入空频块编码矩阵的数据层数为两层；当所述秩索引信息为所述第二预设秩4时，所述第一网络设备控制该开关闭合，使得流入空频块编码矩阵的数据层数为四层，可以理解的是，所述第一网络设备根据所述秩索引信息控制该开关的断开或闭合，进而确定分集编码方式。
可选的，若所述秩索引信息为所述第一预设秩2，则所述第一网络设备确定分集编码方式为第一分集编码方式，所述第一分集编码方式为两层数据的分集编码方式。
可选的，若所述秩索引信息为所述第二预设秩4，则所述第一网络设备确定分集传输模式为第二分集编码方式，所述第二分集编码方式为四层数据的分集编码方式。
203，所述第一网络设备根据所述预编码矩阵索引信息确定预编码矩阵。
具体的，所述第一网络设备根据所述第二网络设备发送的所述预编码矩阵索引信息确定预编码矩阵，即确定图3中的预编码所使用的预编码矩阵。预编码可以分为线性预编码和非线性预编码两种。线性预编码在接收信道状态信息的一端通过一些线性检测手段即可译码，主要有：线性迫零(包括波束成型方法等)、信道求逆等。非线性预编码设计复杂，常见的有污纸编码，通常需要对N个相关的非线性方程组做处理。因为非线性复杂度高，译码算法复杂，因此LTE中采用线性预编码技术，本发明实施例同样采用线性预编码技术。线性预编码操作可以表述为：
Y＝WX
其中，W是预编码矩阵，X为传输数据，即输入预编码的数据，Y为传输信息经过预编码处理之后得到的新的发射向量，即预编码输出的数据。
线性预编码操作可以按其预编码矩阵的获得位置划分为两大类预编码方式：基于非码本的预编码操作和基于码本的预编码操作。
在非码本的预编码方式中，预编码矩阵在基站端获得。基站端利用预测的信道状态信息CSI，进行预编码矩阵的计算，常见的预编码矩阵计算方法有奇异值分解，均匀信道分解等。非码本的预编码方式要求使用专用导频，即数据符号和导频符号一起进行预编码操作，这样用户端只需要通过信道估计就可以获得预编码后的等效信道，从而方便进行数据解调。
在基于码本的预编码方式中，预编码矩阵在用户端获得。所述第二网络设备利用测量的信道状态信息，在预定的预编码码本中进行预编码矩阵的选择，并将选定的预编码矩阵的序号(PMI)发送给基站。预编码矩阵码本的构建方式有多种，如：基于天线选择的码本，基于发射自适应阵列模式的码本，基于离散傅里叶变换的码本，随机码本等。从预定的预编码矩阵码本中选择预编码矩阵可以依据基于性能指标的选择和基于量化的选择两种方式。
在本发明实施例中，所述第一网络设备根据所述预编码索引信息从预设预编码码本中选择预编码矩阵，从而确定所述预编码矩阵。
204，所述第一网络设备根据所述分集编码方式和所述预编码矩阵对待传输数据进行传输处理。
具体的，待所述分集编码方式和所述预编码矩阵确定后，所述第一网络设备根据确定的所述分集编码方式和所述预编码矩阵对待传输数据进行传输处理。所述第一网络设备对待传输数据进行编码、加扰、调制处理得到第一数据，其中，所述待传输数据的数据符号表示为a(0),...,a(Msymb-1)，即为图3中的码字；码字经过编码由图3中的加扰以及调制处理后得到第一数据，所述第一数据的数据符号表示为d(0),...,d(Msymb-1)，Msymb表示所述待传输数据的数据符号数。其中，码字可以为一个或两个码字，若为一个码字，则Msymb为该码字的数据符号数，即所述待传输数据包括多少个该码字；若为两个码字，则Msymb为这两个码字的数据符号数的总和，包括第一个码字的数据符号数Msymb (0)和第二个码字的数据符号数Msymb (1)，第一码字的数据符号表示为d(0)(i),i＝0,1,...,Msymb (0)，第二码字的数据符号表示为d(1)(i),i＝0,1,...,Msymb (1)。具体的编码方式、扰码方式在本发明实施例中不做限定。对于不同的下行信道，调制方式有所不同，例如物理下行共享信道(Physical Downlink Shared Channel，PDSCH)，调制方式有正交相移键控(Quadrature Phase Shift Keyin，QPSK)、16正交振幅调制(Quadrature Amplitude Modulation，QAM)、64QAM。对所述待传输数据的每个码字进行编码，对编码数据进行扰码，以使在一个物理信道上传输。对扰码数据进行调制，以生成复数调制数据符号。
所述第一网络设备根据确定的所述分集编码方式对所述第一数据进行处理得到第二数据。分集编码将复数调制数据符号映射到一个或多个传输层。若确定的所述分集编码方式为所述第一分集编码方式，则所述第一网络设备采用所述第一分集编码方式对d(2k),2k＝0,1,...,Msymb-1进行处理得到第二数据；
其中，所述第一分集编码方式为：
X2k,1＝d(2k)  X2k,2＝d(2k+1)
X2k+1,1＝-(d(2k+1))*  X2k+1,2＝(d(2k))*
X2k,1表示第一层数据在第2k个子载波映射的数据符号，对应于所述第一数据的数据符号d(2k)；X2k+1,1表示第一层数据在第2k+1个子载波映射的数据符号，对应于所述第一数据的数据符号-(d(2k+1))*；X2k,2表示第二层数据在 第2k个子载波映射的数据符号，对应于所述第一数据的数据符号d(2k+1)；X2k+1,2表示第二层数据在第2k+1个子载波映射的数据符号，对应于所述第一数据的数据符号(d(2k))*；所述第二数据的数据符号表示为X，
Figure PCTCN2016076044-appb-000006
矩阵X的第一行表示第2k子载波，第二行表示第2k+1子载波，第一列表示第一层数据，第二列表示第二层数据。
或，所述第一分集编码方式为：
X2k,1＝d(2k)  X2k+1,1＝d(2k+1)
X2k,2＝-(d(2k+1))*  X2k+1,2＝(d(2k))*
X2k,1表示第一层数据在第2k个子载波映射的数据符号，对应于所述第一数据的数据符号d(2k)；X2k+1,1表示第一层数据在第2k+1个子载波映射的数据符号，对应于所述第一数据的数据符号d(2k+1)；X2k,2表示第二层数据在第2k个子载波映射的数据符号，对应于所述第一数据的数据符号-(d(2k+1))*；X2k+1,2表示第二层数据在第2k+1个子载波映射的数据符号，对应于所述第一数据的数据符号(d(2k))*；所述第二数据的数据符号表示为X，
Figure PCTCN2016076044-appb-000007
矩阵X的第一列表示第2k子载波，第二列表示第2k+1子载波，第一行表示第一层数据，第二行表示第二层数据。
可选的，第一分集编码方式为：
X2k,1＝d(2k+1)  X2k,2＝d(2k)
X2k+1,1＝-(d(2k))*  X2k+1,2＝(d(2k+1))*
X2k,1表示第一层数据在第2k个子载波映射的数据符号，对应于所述第一数据的数据符号d(2k+1)；X2k+1,1表示第一层数据在第2k+1个子载波映射的数据符号，对应于所述第一数据的数据符号-(d(2k))*；X2k,2表示第二层数据在第2k个子载波映射的数据符号，对应于所述第一数据的数据符号d(2k)； X2k+1,2表示第二层数据在第2k+1个子载波映射的数据符号，对应于所述第一数据的数据符号(d(2k+1))*；所述第二数据的数据符号表示为X，
Figure PCTCN2016076044-appb-000008
矩阵X的第一行表示第2k子载波，第二行表示第2k+1子载波，第一列表示第一层数据，第二列表示第二层数据。
或，所述第一分集编码方式为：
X2k,1＝d(2k+1)  X2k+1,1＝d(2k)
X2k,2＝-(d(2k))*  X2k+1,2＝(d(2k+1))*
X2k,1表示第一层数据在第2k个子载波映射的数据符号，对应于所述第一数据的数据符号d(2k+1)；X2k+1,1表示第一层数据在第2k+1个子载波映射的数据符号，对应于所述第一数据的数据符号d(2k)；X2k,2表示第二层数据在第2k个子载波映射的数据符号，对应于所述第一数据的数据符号-(d(2k))*；X2k+1,2表示第二层数据在第2k+1个子载波映射的数据符号，对应于所述第一数据的数据符号(d(2k+1))*；所述第二数据的数据符号表示为X，
Figure PCTCN2016076044-appb-000009
矩阵X的第一列表示第2k子载波，第二列表示第2k+1子载波，第一行表示第一层数据，第二行表示第二层数据。
若确定的所述分集编码方式为所述第二分集编码方式，则所述第一网络设备采用所述第二分集编码方式对d(2k),2k＝0,1,...,Msymb-1进行处理得到第二数据；
其中，所述第二分集编码方式如下：
X2k,1＝d(2k)  X2k+1,1＝d(2k+1)
X2k,2＝-(d(2k+1))*  X2k+1,2＝(d(2k))*
X2k,3＝d(2k+2)  X2k+1,3＝d(2k+3)
X2k,4＝-(d(2k+3))*  X2k+1,4＝(d(2k+2))*
X2k,1表示第一层数据在第2k个子载波映射的数据符号，对应于所述第一数据的数据符号d(2k)；X2k+1,2表示第一层数据在第2k+1个子载波映射的数据符号，对应于所述第一数据的数据符号d(2k+1)；X2k,2表示第二层数据在第2k个子载波映射的数据符号，对应于所述第一数据的数据符号-(d(2k+1))*；X2k+1,2表示第二层数据在第2k+1个子载波映射的数据符号，对应于所述第一数据的数据符号(d(2k))*；X2k,3表示第三层数据在第2k个子载波映射的数据符号，对应于所述第一数据的数据符号d(2k+2)；X2k+1,3表示第三层数据在第2k+1个子载波映射的数据符号，对应于所述第一数据的数据符号d(2k+3)；X2k,4表示第四层数据在第2k个子载波映射的数据符号，对应于所述第一数据的数据符号-(d(2k+3))*；X2k+1,4表示第二层数据在第2k+1个子载波映射的数据符号，对应于所述第一数据的数据符号(d(2k+2))*；所述第二数据的数据符号表示为X，
Figure PCTCN2016076044-appb-000010
矩阵X的第一列表示第2k子载波，第二列表示第2k+1子载波，第一行表示第一层数据，第二行表示第二层数据，第三行表示第三层数据，第四行表示第四层数据。
若d(2k)与d(2k+2)为相同的数据且d(2k+1)与d(2k+3)为相同的数据，则所述第二数据中存在重复的数据，有利于提高数据传输的可靠性。若d(2k)与d(2k+2)为不同的数据且d(2k+1)与d(2k+3)为不同的数据，则所述第二数据中不存在重复的数据，有利于提高数据传输的效率。
所述第一网络设备根据确定的所述预编码矩阵对所述第二数据进行预编码处理得到第三数据，即为对每层复数调制数据符号进行预编码处理得到第三数据。其中，所述预编码方式为：Y＝WX，W为确定的所述预编码矩阵，X为所述第二数据的数据符号，Y为所述第三数据的数据符号，分别对每层数据进行预编码处理。所述预编码矩阵的行数为天线端口数，列数为秩。
在完成预编码处理后，所述第一网络设备对所述第三数据进行资源块映射、OFDM信号产生处理并发送。其中，资源块映射处理由图3中的资源元 素映射器执行，OFDM信号产生处理由图3中的OFDM信号产生器执行。资源元素映射器将预编码后的每层复数调制数据符号映射到物理资源块中的资源元素(k,l)。OFDM信号产生器将资源元素映射器处理后的每层复数调制数据符号调制成时域OFDM数据符号。所述第一网络设备通过图3中的天线端口发送OFDM信号产生器处理后的数据符号。所述第一网络设备可将处理后的数据发送至所述第二网络设备，也可发送至其他网络设备。所述第二网络设备在接收到所述第一网络设备通过天线端口发送的数据时，对数据进行OFDM解调。
在本发明实施例中，通过第一网络接收第二网络设备发送的秩索引信息和预编码矩阵索引信息，根据秩索引信息确定分集编码方式，根据所述预编码矩阵索引信息确定预编码矩阵，并根据确定的分集编码方式和预编码矩阵对待传输数据进行传输处理，从而实现第一网络设备将与空频块编码类似的分集编码与预编码相结合，既能获得SFBC分集增益又能获取预编码增益，提高了天线增益，进而降低空间损耗，提高数据的传输可靠性。
请参见图6，为本发明实施例三提供的分集传输方法的流程示意图，如图6所示，本发明实施例三提供的方法可以包括下述301和302的内容。
301，第二网络设备根据导频信号测量信道状态信息。
具体的，第二网络设备通过第一网络设备与所述第二网络设备之间的空中接口接收所述第一网络设备发送的所述导频信号，并在接收到所述导频信号时根据所述导频信号测量所述信道状态信息。
302，所述第二网络设备根据所述信道状态信息向第一网络设备发送秩索引信息和预编码矩阵索引信息。
具体的，所述第二网络设备提取测量到的所述信道状态信息中的秩索引信息和预编码矩阵索引信息，并将所述秩索引信息和所述预编码矩阵索引信息通过所述第二网络设备与所述第一网络设备之间的空中接口发送给所述第一网络设备。所述第二网络设备可以周期性地向所述第一网络设备发送，也可以非周期性地向所述第一网络设备发送，视具体情况而定，具体发送的周期在此不做限定。目前，第二网络设备将测量到的所有信道状态信息全部发送给第一网络设备，本发明实施例中只需要信道状态信息中的秩索引信息和预编码矩阵索 引信息即可，并且本发明实施例中的所述秩索引信息为第一预设秩2或第二预设秩4，而目前的秩索引信息不仅可以是所述第一预设秩2或所述第二预设秩4，还可能是其它的秩，因此需要遍历多个秩再确定发送给第一网络设备的秩，而本发明实施例中的秩就两个，可以在一定程序上节省操作时间。
可选的，所述第二网络设备根据所述信道状态信息从预设预编码码本中选择预编码矩阵，所述第二网络设备根据所述预编码矩阵确定所述预编码矩阵索引信息，并向所述第一网络设备发送所述预编码矩阵索引信息。在所述第二网络设备和所述第一网络设备均存储有所述预设预编码码本，所述第二网络设备根据所述预设预编码码本确定所述预编码矩阵索引信息，所述第一网络设备根据所述预设预编码码本确定所述预编码矩阵索引信息对应的预编码码本。
所述第一网络设备根据所述第二网络设备发送的所述秩索引信息确定分集编码方式，根据所述预编码矩阵索引信息确定预编码矩阵，进而根据确定的所述分集编码方式和所述预编码矩阵对待传输数据进行传输处理，具体处理流程可参见图3。
所述第二网络设备可接收所述第一网络设备发送的处理后的数据，由于传输处理后的数据进行了OFDM调制，因此所述第二网络设备在接收到所述第一网络设备发送的处理后的数据时，对所述处理后的数据进行OFDM解调处理。
在本发明实施例中，通过第二网络设备接收第一网络设备发送的导频信号，并根据所述导频信号测量信道状态信息，并根据信道状态信息向第一网络设备发送秩索引信息和预编码矩阵索引信息，以使第一网络设备确定分集编码方式和预编码矩阵，进而使得第一网络设备将空频块编码与预编码相结合。
请参见图6，为本发明实施例提供的一种第一网络设备的结构示意图，所述第一网络设备60包括信息接收单元601、方式确定单元602、矩阵确定单元603和传输处理单元604。
信息接收单元601，用于接收第二网络设备发送的秩索引信息和预编码矩阵索引信息。
方式确定单元602，用于根据所述秩索引信息确定分集编码方式。
矩阵确定单元603，用于根据所述预编码矩阵索引信息确定预编码矩阵。
数据处理单元604，用于根据所述分集编码方式和所述预编码矩阵对待传输数据进行传输处理。
图6所示的第一网络设备，用于实现图4所示的实施例，其基本思想和有益效果与图4相同，在此不再赘述。
请参见图7，为本发明实施例提供的一种第二网络设备的结构示意图，所述第二网络设备70包括信息测量单元701和信息发送单元702。
信息测量单元701，用于根据导频信号测量信道状态信息。
信息发送单元702，用于根据所述信道状态信息向第一网络设备发送秩索引信息和预编码矩阵索引信息，以使所述第一网络设备根据所述秩索引信息确定分集编码方式，根据所述预编码矩阵索引信息确定预编码矩阵，并根据所述分集编码方式和所述预编码矩阵对待传输数据进行传输处理。
图7所示的第一网络设备，用于实现图5所示的实施例，其基本思想和有益效果与图5相同，在此不再赘述。
图6所示的第一网络设备和图7所示的第二网络设备结合在一起，用于实现图2所示的实施例。
请参见图8，为本发明实施例提供的另一种第一网络设备的结构示意图。如图8所示，该第一网络设备包括：至少一个处理器801，至少一个通信总线802，接收机803、发射机804以及存储器805。其中，通信总线802用于实现这些组件之间的连接通信。其中，接收机803和发射机804统称为收发台，收发台在处理器801的控制下，完成基站的控制与无线信道之间的转换，实现用户设备通信信号的收发与移动平台之间通过空中无线传输及相关的控制功能。处理器801负责所有的移动通信接口管理，主要是无线信道的分配、释放和管理。处理器801调用存储器805中存储的程序代码执行相应的操作，实现相应的功能。
在本发明实施例中处理器801用于控制数据的传输，如图8所示，处理器801包括加扰模块、调制模块、分集模块、预编码模块、资源块模块和OFDM模块，分别对应于图3中的加扰、调制、两个矩阵、预编码、资源元素映射器、OFDM信号发生器。处理器801用于实现图6所示实施例的方式确定单元、 矩阵确定单元和数据处理单元，具体实现过程可参见图4所示实施例的具体描述，在此不再赘述。
接收机803用于实现图6所示实施例的信息接收单元，接收第二网络设备发送的秩索引信息和预编码矩阵索引信息。发射机用于将处理器801处理后的数据通过天线端口发射给第一网络设备覆盖范围内的用户设备，包括第二网络设备。第一网络设备的天线端口未在图8中标明。
请参见图9，为本发明实施例提供的另一种第二网络设备的结构示意图。如图9所示，该第二网络设备包括：至少一个处理器901，例如CPU，至少一个通信总线902，输入设备903、输出设备904，存储器905、电源模块906和无线通信模块907。其中，通信总线902用于实现这些组件之间的连接通信。输入设备903用于接收音频或视频信号，还用于接收用户的输入命令并根据输入命令生成键输入数据以控制第二网络设备的各种操作。输出设备904被构造为以视觉、音频和/或触觉方式提供输出信号(例如，音频信号、视频信号、警报信号、振动信号等等)，输出设备904可以包括显示单元、音频输出模块、警报单元等等，未在图9中标明。电源模块906在处理器901的控制下接收外部电力或内部电力并为通信总线902上的设备、模块、存储器905、处理器901等提供所需的电力。
其中，存储器905可以包括至少一种类型的存储介质，所述存储介质包括闪存、硬盘、多媒体卡、卡型存储器(例如，SD或DX存储器等等)、随机访问存储器(RAM)、静态随机访问存储器(SRAM)、只读存储器(ROM)、电可擦除可编程只读存储器(EEPROM)、可编程只读存储器(PROM)、磁性存储器、磁盘、光盘等等。处理器901通常控制第二网络设备的总体操作，例如，处理器901执行与语音通话、数据通信、视频通话等等相关的控制和处理。
其中，处理器901用于实现图7所示实施例中的信息测量单元，根据导频信号测量信道状态信息。
其中，无线通信模块907用于将无线电信号发送到基站(例如，接入点、节点B等等)、外部终端以及服务器中的至少一个和/或从其接收无线电信号的装置。这样的无线电信号可以包括语音通话信号、视频通话信号、或者根据文 本和/或多媒体消息发送和/或接收的各种类型的数据。
无线通信模块907用于实现图7所示实施例中的信息发送单元，向第一网络设备发送秩索引信息和预编码矩阵索引信息，以使所述第一网络设备根据所述秩索引信息确定分集编码方式，根据所述预编码矩阵索引信息确定预编码矩阵，并根据所述分集编码方式和所述预编码矩阵对待传输数据进行传输处理。无线通信模块907还包括空中接口，未在图9中标明。所述空中接口用于第二网络设备与其他用户设备或第一网络设备进行通信。
本发明实施例还提供一种传输分集系统，包括图6所示的第一网络设备和图7所示的第二网络设备，或包括至图8所示的第一网络设备和图9所示的第二网络设备。
需要说明的是，对于前述的各方法实施例，为了简单描述，故将其都表述为一系列的动作组合，但是本领域技术人员应该知悉，本发明并不受所描述的动作顺序的限制，因为根据本发明，某些步骤可以采用其他顺序或者同时进行。其次，本领域技术人员也应该知悉，说明书中所描述的实施例均属于优选实施例，所涉及的动作和模块并不一定是本发明所必须的。
在上述实施例中，对各个实施例的描述都各有侧重，某个实施例中没有详述的部分，可以参见其他实施例的相关描述。
本发明实施例方法中的步骤可以根据实际需要进行顺序调整、合并和删减。
本发明实施例装置中的单元可以根据实际需要进行合并、划分和删减。本领域的技术人员可以将本说明书中描述的不同实施例以及不同实施例的特征进行结合或组合。
通过以上的实施方式的描述，所属领域的技术人员可以清楚地了解到本发明可以用硬件实现，或固件实现，或它们的组合方式来实现。当使用软件实现时，可以将上述功能存储在计算机可读介质中或作为计算机可读介质上的一个或多个指令或代码进行传输。计算机可读介质包括计算机存储介质和通信介质，其中通信介质包括便于从一个地方向另一个地方传送计算机程序的任何介 质。存储介质可以是计算机能够存取的任何可用介质。以此为例但不限于：计算机可读介质可以包括随机存取存储器(Random Access Memory，RAM)、只读存储器(Read-Only Memory，ROM)、电可擦可编程只读存储器(Electrically Erasable Programmable Read-Only Memory，EEPROM)、只读光盘(Compact Disc Read-Only Memory，CD-ROM)或其他光盘存储、磁盘存储介质或者其他磁存储设备、或者能够用于携带或存储具有指令或数据结构形式的期望的程序代码并能够由计算机存取的任何其他介质。此外。任何连接可以适当的成为计算机可读介质。例如，如果软件是使用同轴电缆、光纤光缆、双绞线、数字用户线(Digital Subscriber Line，DSL)或者诸如红外线、无线电和微波之类的无线技术从网站、服务器或者其他远程源传输的，那么同轴电缆、光纤光缆、双绞线、DSL或者诸如红外线、无线和微波之类的无线技术包括在所属介质的定影中。如本发明所使用的，盘(Disk)和碟(disc)包括压缩光碟(CD)、激光碟、光碟、数字通用光碟(DVD)、软盘和蓝光光碟，其中盘通常磁性的复制数据，而碟则用激光来光学的复制数据。上面的组合也应当包括在计算机可读介质的保护范围之内。
总之，以上所述仅为本发明技术方案的较佳实施例而已，并非用于限定本发明的保护范围。凡在本发明的精神和原则之内，所作的任何修改、等同替换、改进等，均应包含在本发明的保护范围之内。

Claims (21)

  1. 一种传输分集方法，其特征在于，包括：
    第一网络设备接收第二网络设备发送的秩索引信息和预编码矩阵索引信息；
    所述第一网络设备根据所述秩索引信息确定分集编码方式；
    所述第一网络设备根据所述预编码矩阵索引信息确定预编码矩阵；
    所述第一网络设备根据所述分集编码方式和所述预编码矩阵对待传输数据进行传输处理。
  2. 根据权利要求1所述的方法，其特征在于，所述第一网络设备根据所述秩索引信息确定分集编码方式，包括：
    若所述秩索引信息为第一预设秩2，则所述第一网络设备确定所述分集编码方式为第一分集编码方式；和/或，
    若所述秩索引信息为第二预设秩4，则所述第一网络设备确定所述分集编码方式为第二分集编码方式。
  3. 根据权利要求2所述的方法，其特征在于，所述第一网络设备根据所述分集编码方式和所述预编码矩阵对待传输数据进行传输处理，包括：
    所述第一网络设备对待传输数据进行编码、加扰、调制处理得到第一数据；
    所述第一网络设备根据所述分集编码方式对所述第一数据进行处理得到第二数据；
    所述第一网络设备根据所述预编码矩阵对所述第二数据进行预编码处理得到第三数据；
    所述第一网络设备对所述第三数据进行资源块映射、OFDM信号产生处理并发送。
  4. 根据权利要求3所述的方法，其特征在于，所述第一网络设备根据所述分集编码方式对所述第一数据进行处理得到第二数据，包括：
    若所述分集编码方式为所述第一分集编码方式，则所述第一网络设备采用所述第一分集编码方式对所述第一数据进行处理得到第二数据，所述第一数据的数据符号为d(2k),2k＝0,1,...，Msymb-1，Msymb表示所述待传输数据的数据符号数；
    其中，所述第一分集编码方式为：
    X2k,1＝d(2k)  X2k,2＝d(2k+1)
    X2k+1,1＝-(d(2k+1))*  X2k+1,2＝(d(2k))*
    X2k,1表示第一层数据在第2k个子载波映射的数据符号，对应于所述第一数据的数据符号d(2k)；X2k+1,1表示第一层数据在第2k+1个子载波映射的数据符号，对应于所述第一数据的数据符号-(d(2k+1))*；X2k,2表示第二层数据在第2k个子载波映射的数据符号，对应于所述第一数据的数据符号d(2k+1)；X2k+1,2表示第二层数据在第2k+1个子载波映射的数据符号，对应于所述第一数据的数据符号(d(2k))*；所述第二数据的数据符号表示为X；
    或，所述第一分集编码方式为：
    X2k,1＝d(2k)  X2k+1,1＝d(2k+1)
    X2k,2＝-(d(2k+1))*  X2k+1,2＝(d(2k))*
    X2k,1表示第一层数据在第2k个子载波映射的数据符号，对应于所述第一数据的数据符号d(2k)；X2k+1,1表示第一层数据在第2k+1个子载波映射的数据符号，对应于所述第一数据的数据符号d(2k+1)；X2k,2表示第二层数据在第2k个子载波映射的数据符号，对应于所述第一数据的数据符号-(d(2k+1))*；X2k+1,2表示第二层数据在第2k+1个子载波映射的数据符号，对应于所述第一数据的数据符号(d(2k))*；所述第二数据的数据符号表示为X。
  5. 根据权利要求3所述的方法，其特征在于，所述第一网络设备根据所述分集编码方式对所述第一数据进行处理得到第二数据，包括：
    若所述分集编码方式为所述第二分集编码方式，则所述第一网络设备采用所述第二分集编码方式对所述第一数据进行处理得到第二数据，所述第一数据的数据符号为d(2k),2k＝0,1,...,Msymb-1，Msymb表示所述待传输数据的数据符号数；
    其中，所述第二分集编码方式为：
    X2k,1＝d(2k)  X2k+1,1＝d(2k+1)
    X2k,2＝-(d(2k+1))*  X2k+1,2＝(d(2k))*
    X2k,3＝d(2k+2)  X2k+1,3＝d(2k+3)
    X2k,4＝-(d(2k+3))*  X2k+1,4＝(d(2k+2))*
    X2k,1表示第一层数据在第2k个子载波映射的数据符号，对应于所述第一数据的数据符号d(2k)；X2k+1,2表示第一层数据在第2k+1个子载波映射的数据符号，对应于所述第一数据的数据符号d(2k+1)；X2k,2表示第二层数据在第2k个子载波映射的数据符号，对应于所述第一数据的数据符号-(d(2k+1))*；X2k+1,2表示第二层数据在第2k+1个子载波映射的数据符号，对应于所述第一数据的数据符号(d(2k))*；X2k,3表示第三层数据在第2k个子载波映射的数据符号，对应于所述第一数据的数据符号d(2k+2)；X2k+1,3表示第三层数据在第2k+1个子载波映射的数据符号，对应于所述第一数据的数据符号d(2k+3)；X2k,4表示第四层数据在第2k个子载波映射的数据符号，对应于所述第一数据的数据符号-(d(2k+3))*；X2k+1,4表示第二层数据在第2k+1个子载波映射的数据符号，对应于所述第一数据的数据符号(d(2k+2))*；所述第二数据的数据符号表示为X。
  6. 根据权利要求5所述的方法，其特征在于，d(2k)与d(2k+2)为相同的数据且d(2k+1)与d(2k+3)为相同的数据，或者，d(2k)与d(2k+2)为不同的数据且d(2k+1)与d(2k+3)为不同的数据。
  7. 根据权利要求4-6任一项所述的方法，其特征在于，所述第一网络设备根据所述预编码矩阵对所述第二数据进行预编码处理得到第三数据，包括：
    所述第一网络设备根据所述预编码矩阵，按照预编码方式对所述第二数据进行预编码处理得到第三数据；
    其中，所述预编码方式为：Y＝WX，W为所述预编码矩阵，X为所述第二数据的数据符号，Y为所述第三数据的数据符号。
  8. 一种传输分集方法，其特征在于，包括：
    第二网络设备根据导频信号测量信道状态信息；
    所述第二网络设备根据所述信道状态信息向第一网络设备发送秩索引信息和预编码矩阵索引信息，以使所述第一网络设备根据所述秩索引信息确定分集编码方式，根据所述预编码矩阵索引信息确定预编码矩阵，并根据所述分集编码方式和所述预编码矩阵对待传输数据进行传输处理。
  9. 根据权利要求8所述的方法，其特征在于，所述第二网络设备根据所述信道状态信息向第一网络设备发送秩索引信息和预编码矩阵索引信息，包括：
    所述第二网络设备根据所述信道状态信息向第一网络设备发送秩索引信息；
    所述第二网络设备根据所述信道状态信息从预设预编码码本中选择预编码矩阵；
    所述第二网络设备根据所述预编码矩阵确定预编码矩阵索引信息，并向所述第一网络设备发送所述预编码矩阵索引信息。
  10. 一种第一网络设备，其特征在于，包括：
    信息接收单元，用于接收第二网络设备发送的秩索引信息和预编码矩阵索引信息；
    方式确定单元，用于根据所述秩索引信息确定分集编码方式；
    矩阵确定单元，用于根据所述预编码矩阵索引信息确定预编码矩阵；
    传输处理单元，用于根据所述分集编码方式和所述预编码矩阵对待传输数据进行传输处理。
  11. 根据权利要求10所述的第一网络设备，其特征在于，所述方式确定单元用于若所述秩索引信息为第一预设秩2，则确定所述分集编码方式为第一分集编码方式；和/或，
    所述方式确定单元用于若所述秩索引信息为第二预设秩4，则确定所述分集编码方式为第二分集编码方式。
  12. 根据权利要求11所述的第一网络设备，其特征在于，所述传输处理单元包括：
    第一处理单元，用于对待传输数据进行编码、加扰、调制处理得到第一数据；
    第二处理单元，用于根据所述分集编码方式对所述第一数据进行处理得到第二数据；
    第三处理单元，用于根据所述预编码矩阵对所述第二数据进行预编码处理得到第三数据；
    第四处理单元，用于对所述第三数据进行资源块映射、OFDM信号产生处理并发送。
  13. 根据权利要求12所述的第一网络设备，其特征在于，所述第二处理单元用于若所述分集编码方式为所述第一分集编码方式，则所述第一网络设备采用所述第一分集编码方式对所述第一数据进行处理得到第二数据，所述第一数据的数据符号为d(2k),2k＝0,1,...,Msymb-1，Msymb表示所述待传输数据的数据符号数；
    其中，所述第一分集编码方式为：
    X2k,1＝d(2k)  X2k,2＝d(2k+1)
    X2k+1,1＝-(d(2k+1))*  X2k+1,2＝(d(2k))*
    X2k,1表示第一层数据在第2k个子载波映射的数据符号，对应于所述第一数据的数据符号d(2k)；X2k+1,1表示第一层数据在第2k+1个子载波映射的数据符号，对应于所述第一数据的数据符号-(d(2k+1))*；X2k,2表示第二层数据在第2k个子载波映射的数据符号，对应于所述第一数据的数据符号d(2k+1)；X2k+1,2表示第二层数据在第2k+1个子载波映射的数据符号，对应于所述第一数据的数据符号(d(2k))*；所述第二数据的数据符号表示为X；
    或，所述第一分集编码方式为：
    X2k,1＝d(2k)  X2k+1,1＝d(2k+1)
    X2k,2＝-(d(2k+1))*  X2k+1,2＝(d(2k))*
    X2k,1表示第一层数据在第2k个子载波映射的数据符号，对应于所述第一数据的数据符号d(2k)；X2k+1,1表示第一层数据在第2k+1个子载波映射的数据 符号，对应于所述第一数据的数据符号d(2k+1)；X2k,2表示第二层数据在第2k个子载波映射的数据符号，对应于所述第一数据的数据符号-(d(2k+1))*；X2k+1,2表示第二层数据在第2k+1个子载波映射的数据符号，对应于所述第一数据的数据符号(d(2k))*；所述第二数据的数据符号表示为X。
  14. 根据权利要求12所述的第一网络设备，其特征在于，所述第二处理单元用于若所述分集编码方式为所述第二分集编码方式，则所述第一网络设备采用所述第二分集编码方式对所述第一数据进行处理得到第二数据，所述第一数据的数据符号为d(2k),2k＝0,1,...,Msymb-1，Msymb表示所述待传输数据的数据符号数；
    其中，所述第二分集编码方式为：
    X2k,1＝d(2k)  X2k+1,1＝d(2k+1)
    X2k,2＝-(d(2k+1))*  X2k+1,2＝(d(2k))*
    X2k,3＝d(2k+2)  X2k+1,3＝d(2k+3)
    X2k,4＝-(d(2k+3))*  X2k+1,4＝(d(2k+2))*
    X2k,1表示第一层数据在第2k个子载波映射的数据符号，对应于所述第一数据的数据符号d(2k)；X2k+1,2表示第一层数据在第2k+1个子载波映射的数据符号，对应于所述第一数据的数据符号d(2k+1)；X2k,2表示第二层数据在第2k个子载波映射的数据符号，对应于所述第一数据的数据符号-(d(2k+1))*；X2k+1,2表示第二层数据在第2k+1个子载波映射的数据符号，对应于所述第一数据的数据符号(d(2k))*；X2k,3表示第三层数据在第2k个子载波映射的数据符号，对应于所述第一数据的数据符号d(2k+2)；X2k+1,3表示第三层数据在第2k+1个子载波映射的数据符号，对应于所述第一数据的数据符号d(2k+3)；X2k,4表示第四层数据在第2k个子载波映射的数据符号，对应于所述第一数据的数据符号-(d(2k+3))*；X2k+1,4表示第二层数据在第2k+1个子载波映射的数据符号，对应于所述第一数据的数据符号(d(2k+2))*；所述第二数据的数据符号表示为X。
  15. 根据权利要求14所述的第一网络设备，其特征在于，d(2k)与d(2k+2) 为相同的数据且d(2k+1)与d(2k+3)为相同的数据，或者，d(2k)与d(2k+2)为不同的数据且d(2k+1)与d(2k+3)为不同的数据。
  16. 根据权利要求13-15任一项所述的第一网络设备，其特征在于，所述第三处理单元用于根据所述预编码矩阵，按照预编码方式对所述第二数据进行预编码处理得到第三数据；
    其中，所述预编码方式为：Y＝WX，W为所述预编码矩阵，X为所述第二数据的数据符号，Y为所述第三数据的数据符号。
  17. 一种第二网络设备，其特征在于，包括：
    信息测量单元，用于根据导频信号测量信道状态信息；
    信息发送单元，用于根据所述信道状态信息向第一网络设备发送秩索引信息和预编码矩阵索引信息，以使所述第一网络设备根据所述秩索引信息确定分集编码方式，根据所述预编码矩阵索引信息确定预编码矩阵，并根据所述分集编码方式和所述预编码矩阵对待传输数据进行传输处理。
  18. 根据权利要求17所述的第二网络设备，其特征在于，所述信息发送单元包括：
    秩信息发送单元，用于根据所述信道状态信息向第一网络设备发送秩索引信息；
    矩阵选择单元，用于根据所述信道状态信息从预设预编码码本中选择预编码矩阵；
    矩阵信息发送单元，用于根据所述预编码矩阵确定预编码矩阵索引信息，并向所述第一网络设备发送所述预编码矩阵索引信息。
  19. 一种第一网络设备，其特征在于，所述第一网络设备包括接收机、发射机、存储器以及处理器，其中，存储器中存储一组程序代码，且处理器用于调用存储器中存储的程序代码，使得所述第一网络设备执行如权利要求1-7任一项所述的方法。
  20. 一种第二网络设备，其特征在于，所述第二网络设备包括输入模块、输出模块、存储器以及处理器，其中，存储器中存储一组程序代码，且处理器用于调用存储器中存储的程序代码，使得所述第二网络设备执行如权利要求8-9任一项所述的方法。
  21. 一种传输分集系统，其特征在于，包括如权利要求10-16所述的第一网络设备以及如权利要求17-18所述的第二网络设备；或包括如权利要求19所述的第一网络设备和如权利要求20所述的第二网络设备。
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