Combined signal processing method for source end and relay end in bidirectional relay system

Abstract

A combined signal processing method for a source end and a relay end in a bidirectional relay system comprises the following steps: the source end emits a training sequence to a relay, and the relay performs backward channel estimation to obtain an estimation channel between the source end and the relay; the relay emits a training sequence to the source end, and the source end performs forward channel estimation to obtain an estimation channel between the relay and a user; the source end feed forward channel information back to the relay, the relay performs iterative computation to source end nonlinear pre-coding matrixes, relay linear pre-coding matrixes and source end receiving equalization matrixes; the relay feeds the information of the source end back to the source end; emitting signals are subjected to nonlinear pre-treatment through the source end and then emitted to the relay; the signals received by the relay are subjected to linear pre-treatment through the relay and then broadcasted to the source end; and the source end detects the received signals to obtain information required to be transmitted therebetween. According to the invention, the bidirectional relay information transmission mode is adopted to improve the channel capacity, and the nonlinear signal processing method is adopted at the source end, so that the bit error rate performance of the system is improved.

Description

technical field [0001] The invention relates to a method in the field of wireless communication, in particular to a joint signal processing method of a source end and a relay end in a two-way relay system. Background technique [0002] The relay technology in the mobile communication system can effectively expand the coverage of the network and improve the system capacity. Long Term Evolution-Advanced) standard adopted. At present, the relay methods mainly include DF (Decode-and-Forward, decoding and forwarding), AF (Amplify-and-Forward, amplification and forwarding), etc. Among them, the AF method has been widely used because of its simple implementation and low complexity. The traditional relay system needs 4 time slots to realize the mutual transmission of information between two users. However, the two-way relay system only needs 2 time slots to realize the mutual transmission of information between two users. Therefore, the system capacity can be doubled by using the...

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Problems solved by technology

[0005] After retrieval, it was also found that Rui Wang Meixia Tao, "Joint Source and Relay Precoding Designs for MIMO Two-wWay Relay Systems," IEEE ICC, 2011 ("Joint Source and Relay Precoding Designs in MIMO Two-Way Relay Systems", IEEE International Communication Conference, 2011), this article jointly designs the signal processing of the source and the relay to minimize the mean square error of the detection signal, but this technology uses a linear signal processing method at the source, which is different from using a nonlinear Compared with the signal processing method, the implementation is simple, but it brings the loss of system performance such as mean square error and bit error rate.

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