Collaborative communication method and collaborative communication system based on non-orthogonal multiple access

Abstract

The invention discloses a collaborative communication method based on non-orthogonal multiple access, and the method comprises the following steps: a relay node receives a source node signal and channel state information; the relay node decodes the source node signal through successive interference cancellation to obtain a decoded signal; superposition coding is executed for the coded signal according to a power distribution coefficient, the relay node sends the superposed signal to a plurality of destination nodes simultaneously through performing downlink non-orthogonal multiple access withthe plurality of destination nodes; the destination nodes perform decoding and information recovery for the superposed signal through successive interference cancellation; according to channel state information and user requirements, transmitting power and the power distribution coefficients of all the nodes are calculated, and a plurality of source nodes send the obtained information to the relaynode through performing uplink non-orthogonal multiple access with the relay node. In the method and the system provided by the invention, the non-orthogonal multiple access technology is used, userrate is satisfied, total consumption of the system is minimized, the number of access users is expanded effectively, spectrum efficiency of the system is promoted, and power consumption of the systemis reduced.

Description

technical field [0001] The invention relates to the field of wireless communication technology research, in particular to a non-orthogonal multiple access-based cooperative communication method and system. Background technique [0002] With the rapid development of wireless communication technology, people's requirements for the coverage and running time of wireless communication network are increasing day by day. In order to improve the coverage of communication network, cooperative communication based on relay is a common scheme. The use of relays can solve the problem of large path consumption between communication parties caused by geographical constraints, thereby effectively improving the coverage of the communication network and the efficiency of communication. [0003] In the prior art, however, the system often consumes too much energy. Therefore, how to fully consider the actual situation to improve relay communication performance, how to adopt reasonable power a...

AI Technical Summary

Problems solved by technology

[0003] In the prior art, it often occurs that the system consumes too much energy

Images