Precoding method for joint cell relay in broadcast channel based on relay cooperation

Abstract

The invention discloses a precoding method for a joint cell relay in a broadcast channel based on relay cooperation. The method comprises precoding of an information source, relay processing and receiving of information sinks. First, the information source initializes an information source precoding matrix and a relay processing matrix, and then the information source establishes a receiving matrix for each information sink based on the previous two initialized matrixes. Then, the optimized information source precoding matrix and each information sink receiving matrix are presumed to be unchanged, the relay processing matrix is optimized. In a similar way, the optimized information source and the relay processing matrix are presumed to be unchanged, and the receiving matrix of each information sink is optimized. Iteration of the above process goes on until convergence. Finally, the information source transmits the relay processing matrix to the relay and broadcasts the precoding matrix of the information source and the relay processing matrix to an information sink group. By means of the method, a direct link from the information source to the information sink group and a relay link between the information source and the relay and the information sink group are utilized innovatively so that total capacity of a system is improved.

Description

technical field [0001] The invention relates to the field of wireless communication, in particular to a linear precoding method based on a joint source and a relay node in a downlink broadcast channel based on relay cooperative transmission. Background technique [0002] With the continuous development of communication technology, people have higher and higher performance requirements on transmission rate, transmission reliability, resource utilization and communication security. van der Meulen et al. proposed the concept of three-terminal relay cooperative communication in 1971. Its core idea is to allow the relay node to simply amplify or compress and encode or decode and re-encode the information from the source before virtual transmission Sink, the purpose is to help the source transmit information to the sink. However, in the 1980s, the research on cooperative relay system gradually decreased, and it was not until the beginning of this century that it aroused extensive...

AI Technical Summary

Problems solved by technology

However, the current research on source (eNB) precoding is based on the Type-I model, and the channel information ratio of the direct link has not been effectively utilized.

Whether it is possible to use the information of the direct link for relevant precoding design to improve the performance of this system, there is no relevant research in this regard

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