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A method and device for transmitting downlink signals in a multi-antenna system
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A multi-antenna system, signal technology, applied in diversity/multi-antenna system, space transmit diversity, advanced technology and other directions, can solve the problems of high computational complexity, affecting downlink system throughput rate, poor downlink channel performance, etc., to achieve improved computing mode, power optimization, the effect of simplifying complexity
Active Publication Date: 2017-09-15
CHINA MOBILE COMM GRP CO LTD
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[0007] Embodiments of the present invention provide a method and device for transmitting downlink signals in a multi-antenna system, which are used to solve the problem of high computational complexity in the downlink channel precoding technology in the prior art, or when the computational complexity is reduced The performance of the obtained downlink channel is poor, which further affects the throughput of the downlink system
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Embodiment 1
[0028] Such as figure 1 As shown, it is a flowchart of a method for transmitting a downlink signal in a multi-antenna system in Embodiment 1 of the present invention, and the method includes:
[0029] Step 101: Receive pilot signal information sent by a terminal, and determine a downlink channel sub-matrix required by the terminal.
[0030] Wherein, the pilot signal information sent by the terminal specifically includes:
[0031] In the TDD system, the terminal sends the sounding signal SRS as pilot signal information to the network side;
[0032] In the FDD system, the terminal monitors the downlink common pilot signal information sent by the network side, determines the downlink channel state information, and sends it to the network side.
[0033] Specifically, in step 101, the determination of the sub-matrix of the downlink channel required by the terminal specifically includes:
[0034] First, the sounding signal SRS sent by the terminal is received.
[0035] Specifica...
Embodiment 2
[0061] Such as figure 2 As shown, it is a schematic structural diagram of a downlink signal transmitting device in a multi-antenna system according to Embodiment 2 of the present invention. The device includes: an acquisition module 11, a calculation module 12, and a transmission module 13, wherein:
[0062] The obtaining module 11 is used to receive the pilot signal information sent by the terminal, and determine the downlink channel sub-matrix required by the terminal;
[0063] The calculation module 12 is used to obtain the downlink channel matrix H by using the determined downlink channel sub-matrix of the terminal, and receive the noise power fed back by the terminal to calculate the noise power matrix V, and according to the obtained downlink channel matrix H and the noise power matrix V, Obtain the precoding sub-matrix C, calculate the downlink channel matrix H and the precoding sub-matrix C, and obtain the precoding matrix of the downlink channel;
[0064] The transm...
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Abstract
The invention discloses a downlink signal sending method and downlink signal sending equipment in a multiaerial system. The downlink signal sending method mainly comprises the following contents: obtaining a downlink channel submatrix required by a terminal by virtue of receiving pilot signal information sent by the terminal; determining a downlink channel matrix of an aerial system and obtaining a noise power matrix according to noise power fed back by each terminal; obtaining a precoding submatrix by use of the downlink channel matrix and the noise power matrix, and determining the precoding matrix of the downlink channel, so that the influence of interference and noises among the terminals on the system performance is taken into consideration in a precoding matrix acquisition process; obtaining a precoding submatrix C according to the obtained downlink channel matrix H and noise power matrix X. According to the method and the equipment, the computation complexity is simplified, the precoding matrix computing mode in the prior art is improved, meanwhile, the precoding matrix of antennae is determined by virtue of considering the factor that different terminals are influenced by noises, and the downlink signal power of the antennae is optimized.
Description
technical field [0001] The present invention relates to the field of wireless communication, in particular to a method and equipment for transmitting downlink signals in a multi-antenna system. Background technique [0002] In a MultiUser Multiple-Input Multiple-Output (MUMIMO) system, the base station sends the required data to multiple users at the same time, and multiple users share the same time-frequency resource. Therefore, in the MU MIMO system In , there is a problem of co-channel interference between users. [0003] In order to solve the above problems, some related literatures propose to use a normalized zero-breaking inverse precoding technology (Regularized Zero Forcing, RZF) to eliminate the interference of user signals between downlink channels. [0004] Wherein: the RZF technology obtains the equivalent null space of each user through the inverse of the precoding matrix of the downlink equivalent channel, and effectively avoids signal interference between use...
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