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Published in:   Vol. 7 Issue 2 Date of Publication:   December 2018

Optimal Channel and Relay Assignment in Ofdmbased Multi-Relay Multi-Pair Two-Way Communication Networks

A.Amuli,J.Vinoth Kumar

Page(s):   49-55 ISSN:   2278-2397
DOI:   10.20894/IJBI.105.007.002.005 Publisher:   Integrated Intelligent Research (IIR)

Efficient utilization of radio resources in wireless networks is crucial and has been investigated extensively. This letter considers a wireless relay network where multiple user pairs conduct bidirectional communications via multiple relays based on orthogonal frequency-division multiplexing (OFDM) transmission. The joint optimization of channel and relay assignment, including subcarrier pairing, subcarrier allocation as well as relay selection, for total throughput maximization is formulated as a combinatorial optimization problem. Using a graph theoretical approach, we solve the problem optimally in polynomial time by transforming it into a maximum weighted bipartite matching (MWBM) problem. Simulation studies are carried out to evaluate the network total throughput versus transmit power per node and the number of relay nodes