Linear processing optimization method based on multi-antenna two-way relay wireless communication system
A wireless communication system and two-way relay technology, which is applied in the field of optimization of wireless communication network transmission, can solve problems such as insufficient research on two-way relay, non-linear and non-convex problems, and reduce error probability, mean square error, and improve quality effect
Active Publication Date: 2015-10-21
NANJING UNIV OF POSTS & TELECOMM INST AT NANJING CO LTD
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Problems solved by technology
However, the current research on the linear optimization processing of two-way relays, especially multi-antenna multi-relay systems is not deep enough
Since the communication performance of two users involves the capacity domain, the mean square error sum, etc., multiple relays must simultaneously ensure the performance optimization of the two users. The optimization problem is nonlinear and non-convex, and there is no closed-form solution or some efficient plan
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[0022] Specific embodiments of the present invention will be described below in conjunction with the accompanying drawings.
[0023] Such as figure 1 As shown, the present invention relates to a linear processing optimization method based on a multi-antenna two-way relay wireless communication system. The network architecture based on the method includes users, base stations, and n relays, wherein n is a natural number greater than 1, and the users and The base station implements two-way communication through n relays, specifically including the following steps:
[0024] Step (1), the base station and the user respectively precode the transmitted signal and send it to the relay in the first time slot at the same time;
[0025] Step (2) The relay receives the superposition of the signals sent by the base station and the user, and optimizes the processing to obtain the optimal linear precoding of the relay, as follows:
[0026] (21) The relay first constructs the objective fun...
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The invention relates to a linear processing optimization method based on a multi-antenna two-way relay wireless communication system, and belongs to the technical filed of wireless communication network transmission. The linear processing optimization method based on the multi-antenna two-way relay wireless communication system comprises the steps that a base station and a user simultaneously send respective signals to relays, the relays receive superposition of signals sent by the base station and the user and structure an optimization problem with a signal MSE as an objective function and relay power limitation as a constraint condition, then an optimization problem of a matrix variable is processed in a diagonalization mode and simplified into an optimization problem of a scalar variable, the scalar variable is solved through a KKT condition, an optimal relay precoding matrix is obtained, the relays enable the received signals of the base station and the user to be multiplied by obtained optimal linear precoding, the relays further broadcast and emit the received signals of the base station and the user to the base station and the user, and the base station and the user process the signals received respectively. The linear processing optimization method based on the multi-antenna two-way relay wireless communication system can enable MSEs of respective emitted signals and received signals of the base station and the user to be decreased, and therefore error probability of received signals of a terminal is reduced.
Description
technical field [0001] The invention relates to a linear processing optimization method of a two-way relay-assisted multiple-input multiple-output (MIMO) communication system based on an amplify-and-forward (AF) relay strategy, and belongs to the technical field of optimization in wireless communication network transmission. Background technique [0002] In order to meet the higher requirements of the future wireless communication system on spectrum efficiency and power efficiency, it is necessary to fully exploit and utilize space wireless resources. Introducing relay cooperative communication into the existing cellular network structure can significantly improve the system's spectrum utilization and Network coverage area. The requirement of high transmission bandwidth in wireless communication can only allow the system to work in a higher frequency band, and a higher working frequency band means an increase in path loss, which will cause the traditional cellular network to...
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IPC IPC(8): H04B7/04H04B7/15H04L1/00
Inventor 傅友华刘陈沈玲玲
Owner NANJING UNIV OF POSTS & TELECOMM INST AT NANJING CO LTD