Full duplex relay transmission method based on loop interference reconstruction cancellation

Abstract

The invention belongs to the technical field of radio transmission and discloses a full duplex relay transmission method based on loop interference reconstruction cancellation. The full duplex relay transmission method comprises the steps of estimating channel parameters; enabling a source node to modulate an information source signal; enabling a relay node to forward an emission signal of the source node; and enabling a destination node to decode the received emission signal of the relay node. According to the full duplex relay transmission method, the shortage that the complexity of the relay node is increased due to the fact that residual loop interference of the relay node is processed in the prior art is overcome, the full duplex relay transmission method has the advantage of simplifying a processing process of the relay node, and the complexity of the relay node is reduced; the signal transmission is performed by using OFDM (Orthogonal Frequency Division Multiplexing) without a cyclic prefix and the reconstruction cancellation is performed on the loop interference, so the consumption of a system spectrum resource by the cyclic prefix is reduced, and the spectrum utilization rate of a full duplex relay cooperative communication system is further improved; the signal to interference and noise ratio of a receiving end of the destination node is maximized under a condition inwhich the residual loop interference does not need to be further cancelled, and the reliability of the full duplex relay cooperative communication system is improved.

Description

technical field [0001] The invention belongs to the technical field of radio transmission, in particular to a full-duplex relay transmission method based on loop interference reconstruction cancellation. Background technique [0002] At present, the existing technologies commonly used in the industry are as follows: In order to meet the increasing demand for data transmission, the bandwidth required for signals in wireless communication is getting wider and wider. In the case of increasingly tight frequency band resources, it is necessary to study solutions to improve spectrum utilization efficiency. . The cooperative communication system can obtain the space diversity gain similar to the MIMO system by using idle nodes in the communication network as relay nodes for signal forwarding, which can be used to combat multipath fading of wireless channels. Full-duplex technology can transmit and receive signals on the same frequency at the same time, so it can greatly improve th...

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Problems solved by technology

The disadvantage of this method is that the process used by the full-duplex cooperative system to use the beamforming to eliminate the loop interference is complicated, and it does not consider the existence of direct links in the system, so it is not suitable for the existence of direct links. in common scenarios

The disadvantage of this method is that: due to the additional self-interference cancellation technology used in the full-duplex system to offset the loop interference, the processing delay and operational complexity of the relay node are increased.

[0004] (1) The beamforming scheme is used in the full-duplex relay method to use beamforming to eliminate the loop interference. The process operation is complicated, and it does not consider the existence of direct links in the system.

[0005] (2) Communication method based on full-duplex multi-relay system Since the self-interference cancellation technology is used in the full-duplex system to offset the loop interference, the processing delay and complexity of the relay node are increased

The existing interference cancellation technology still cannot completely eliminate the loop self-interference, and the processing method for the remaining loop self-interference affects the overall performance of the system

Existing technologies generally use additional technologies to directly perform interference cancellation, which undoubtedly added additional operation and processing delays

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