Simultaneous co-frequency full-duplex two-way relay transmission method based on single-carrier frequency domain equalization

Abstract

The present invention discloses a simultaneous co-frequency full-duplex bi-directional relay transmission method based on single carrier frequency domain equalization, so that a problem that complexity of the relay node is increased because of processing of the residual self interference in the prior art can be solved. The method comprises: (1), estimating a channel parameters; (2), selecting an optimal relay node by using an estimated channel coefficients; (3), calculating an optimal amplification factor of an optimal relay node; (4), constructing an equivalent multipath channel of the optimal relay node; (5), modulating an emission signal by a source node; (6), forwarding the emission signal of the source node by the optimal relay node; (7), carrying out frequency domain equalization on a received signal by the source node by using the equivalent multipath channel of the optimal relay node; and (8), demodulating the equalized received signal by the source node and carrying out restoration to obtain a signal source signal. Therefore, the processing of the relay node is simplified and the signal to noise ratio of the system is improved to the greatest extent, so that reliability of the simultaneous co-frequency full-duplex bi-directional relay system is improved. The method can be applied to a distributed collaborative transmission system of wireless communication.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and in particular relates to a full-duplex bidirectional relay transmission method, which can be used in a distributed cooperative transmission system of wireless communication, and improves the reliability and spectrum utilization rate of the cooperative communication system. Background technique [0002] As the signal bandwidth in wireless communication becomes wider and wider, but the corresponding spectrum resources are less and less, people gradually begin to study algorithms and technologies that can maximize the use of spectrum resources. Full-duplex technology transmits and receives signals at the same time and in the same frequency band, so it can maximize the utilization of spectrum resources in future wireless communication networks, but it has serious self-interference problems, which limits full-duplex Improve system performance. Cooperative communication technology u...

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Problems solved by technology

However, the disadvantage of this method is that it ignores the fact that the relay residual self-interference signal iterates infinitely between the relay transmitting and receiving antennas, and modeling the relay residual self-interference channel as a single-path Rayleigh flat fading channel cannot completely Objectively reflect the impact of residual self-interference on full-duplex relay performance

[0005] Document 3, Xidian University proposed a method based on asynchronous The full-duplex relay transmission method of the space-time code, which uses the asynchronous space-time code codec technology to suppress and eliminate the residual self-interference signal of the relay node. The disadvantages of this full-duplex relay transmission method are: The use of asynchronous space-time coding and decoding methods in full-duplex cooperative communication systems increases the complexity of the relay node's processing of residual self-interference signals

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