Communication method based on full-duplex multi-relay system

Abstract

The invention discloses a communication method based on a full-duplex multi-relay system, and belongs to the technical field of wireless cooperative communication. According to the method, multiple full-duplex relay nodes are deployed between an information source and an information destination, thereby receiving and decoding an information source signal; the optimum relay node is selected from the relay nodes capable of decoding the information source signal accurately, and the decoded information source signal is forwarded to the information destination by the optimum relay node; and moreover, the information source sends a new signal. Due to working in a full-duplex mode, the optimum relay node will be influenced by loop self-interference; the other relay nodes will be influenced by inter-relay interference, so that a corresponding interference elimination technology is designed by the method, and the system performance under different surplus loop self-interference strength is analyzed. According to the method, an experiment simulation analysis result shows that under the condition that a normal transmission speed and a signal to noise ratio are normal, the method has comprehensive performance of a low signal interruption probability, high system spectral efficiency and high system robustness.

Description

technical field [0001] The invention belongs to the technical field of wireless cooperative communication, and in particular relates to a communication method based on a full-duplex multi-relay system. Background technique [0002] In the traditional half-duplex cooperative communication system, by deploying single or multiple half-duplex relay nodes between the source and the sink to help forward the source information, the reliability of wireless transmission can be improved, and the wireless communication system can be expanded. coverage. However, since the half-duplex relay node cannot receive and forward information at the same time, that is, it can only receive a new signal after forwarding the signal received in the previous time slot, so transmitting a source signal needs to occupy two time slots, resulting in serious spectrum interference. Waste of resources. In order to make full use of the advantages of cooperative relay technology and improve its spectral effic...

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Problems solved by technology

[0003] Aiming at the above-mentioned defects in the half-duplex relay communication system, the present invention provides a communication method based on a full-duplex multi-relay system, the purpose of which is to deploy multiple full-duplex relays between the source and the sink The working relay node receives and decodes the source signal, and selects an optimal relay node from the decoding relay nodes to forward the decoded signal to the sink. At the same time, we design the corresponding interference elimination technology to eliminate the generated Different types of signal interference, and analyzed the system performance under different residual interference strengths, thereby solving technical problems such as low system spectrum utilization and insufficient robustness in the prior art

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