Minimum mean square error beam forming-based information transmission method in two-way channel

Abstract

The invention discloses a minimum mean square error beam forming-based information transmission method in a two-way channel, belongs to the technical field of wireless communication, and mainly solves the problem of high technical complexity of the prior art. Particularly, the invention provides the information transmission method capable of improving channel capacity and error ratio performance, and reducing complexity at the same time by aiming at a wireless communication network of two source nodes and a relay node. The method comprises the following steps that: the two source nodes simultaneously send encoding information to the relay node; the relay node builds a beam forming matrix according to a minimum mean square error rule; the relay node carries out beam forming processing on the received source node mixed information, and then broadcasts the source node mixed information after the beam forming processing to the source nodes; and the source nodes are decoded to acquire information of other parts. The method reduces the complexity and ensures the correctness of transmission without great influence on system performance, and can be used for reliable information transmission in a two-way relay system.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and relates to network coding and beam forming, in particular to a wireless communication network of two source nodes and a relay node, which can be used to improve channel capacity and bit error rate performance. Background technique [0002] Using relays to help mobile users forward data can obtain additional diversity gain and improve the bit error BER performance of the receiving end. It is one of the effective means to improve the call quality of mobile users at the edge of the cell. against figure 1 In the shown wireless two-way relay channel, when two source nodes exchange information through a relay node, four time slots are usually required, that is, two source nodes occupy one time slot to communicate with the relay node, and the relay node occupies Two time slots, forwarding data for two source nodes respectively. [0003] As a design scheme in modern communication net...

AI Technical Summary

Problems solved by technology

[0005] The beamforming method in the wireless communication network designs the beamforming matrix according to the state of the fading channel, and uses the beamforming matrix to preprocess the transmitted signal to eliminate inter-channel interference, improve the transmission performance in the multipath fading channel, and the capacity of the two-way relay channel is optimal The beamforming method is different from the design in the traditional network. The beamforming matrix is ​​designed based on the capacity limit of the system. Although the existing optimal beamforming method can meet the system capacity and eliminate the interference at the same time, it is more complicated. Although the suboptimal beamforming method reduces the complexity, the bit error rate performance is poor, which brings more error bits to the transmission process and affects the correctness of the transmission.

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