Optimal Channel and Relay Assignment in OFDM Based Multi Relay Multi Pair Two Way Communication Networks
The aim of the paper lies in maximizing the system total throughput by optimally coordinating the relay and subcarrier assignment among the multiple pairs of two way users .In this Paper, consider an OFDM based network where multiple relays help multiple pairs of source nodes to conduct Bidirectional communications. The joint optimization problem of subcarrier pairing based subcarrier assignment and relay selection for multiple two way users is considered as a combinatorial optimization problem. Hence graph based approach is implemented to establish the equivalence between the proposed problem and a maximum weighted bipartite matching (MWBM) problem. Then the problem is solved by the corresponding graph based algorithm optimally in polynomial time