Research on multi-relay collaborative network based on optimal coherent integration

The communication system which uses multi-relay collaborative can achieve high SNR and diversity order level. In this paper, a pair of communication nodes which a number of relay nodes cooperating in parallel support are considered, and the optimal weighting parameters for coherent combining based on non-regenerative relaying are derived under aggregate relay power constraint. The analysis has shown that each relay only requires that the received signal can multiply with an individual amplitude factor and common amplitude normalization factor, then the result will be substantially enhanced comparing to direct communication, and it will improve with the increase of relay station density.