Linear pre-coding method based on multi-cell coordination Massive MIMO system
A linear precoding and multi-cell technology, applied in diversity/multi-antenna systems, space transmit diversity, etc., can solve the problems of increasing inter-cell co-channel interference, signal mutual interference, etc., to suppress interference, improve system capacity, and analyze accurately Effect
Inactive Publication Date: 2015-04-29
BEIJING UNIV OF POSTS & TELECOMM
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However, both methods will increase the co-channel interference between cells
In addition, there is also mutual interference between signals transmitted to different users in the same cell
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[0023] The present invention will be described in detail below with reference to the drawings and specific algorithm flow charts of the embodiments. It mainly includes the following steps.
[0024] In step 201, the downlink channel estimation value of each cell is obtained by using the H-inf algorithm.
[0025] In step 202, the RZF precoding normalization coefficient of each cell is calculated according to the base station transmission power constraints of each cell.
[0026] In step 203, the RZF precoding matrix of each cell is calculated according to the linear precoding criterion.
[0027] In step 204, the RZF precoding matrix is multiplied by the transmit data matrix of each cell to obtain the baseband transmit signal of each cell, and the RZF precoding is completed.
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The invention discloses a linear pre-coding method (RZF pre-coding) based on a multi-cell coordination Massive MIMO system. The method comprises the following steps: firstly, estimating down-link channel matrixes of all cells, calculating a RZF pre-coding coefficient, obtaining a RZF pre-coding matrix, and finally, enabling the RZF pre-coding matrix to be multiplied by a data matrix namely the matrix formed by data signals transmitted to all users by a base station, so as to obtain a base band transmitting signal. According to the invention, the influences of channel relevance and channel estimated errors on system performance are fully considered, so that interfering signals from the cell and other cells can be well restrained. Through multi-cell coordination, namely sharing of channel state information and sending data of all cells, inter-cell interference can be restrained effectively. By introducing pre-coding generalized parameters, system analysis is performed on the multi-cell coordination Massive MIMO linear pre-code, so that a pre-coding matrix for a special channel can be obtained, and thus the system channel capacity is improved.
Description
technical field [0001] The invention belongs to the technical field of wireless communication, and in particular relates to multi-cell cooperative communication and Massive MIMO precoding. Background technique [0002] MIMO (Multiple-Input Multiple-Output technology) is one of the key technologies for improving the capacity of wireless communication channels and realizing high-speed data transmission, and has made a key contribution to improving the system capacity of wireless communication. MIMO obtains diversity gain and multiplexing gain by increasing the number of transceiver antennas at the transceiver end, thereby improving the spectral efficiency of the system and obtaining higher channel capacity. [0003] Due to limited spectrum resources, cellular communication adopts frequency multiplexing to cover unlimited areas with limited spectrum resources. Therefore, there must be co-channel interference between cells using the same frequency band. The higher the frequenc...
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IPC IPC(8): H04B7/06
Inventor 谢刚刘元安郭莽青刘凯明刘芳
Owner BEIJING UNIV OF POSTS & TELECOMM