Opportunistic source scheduling in multi-source two-way relay networks

We consider a multi-source two-way relay network, in which one source communicates with N other sources (n = 1,2,...,N) with the help of a single amplify-and-forward relay. We propose two opportunistic source scheduling schemes in such a network. According to the proposed schemes, in each transmission interval, only a single out of the N sources is selected, and this selected node acts as either transmitter or receiver depending on the channel conditions. For both schemes, tight closed-form lower bounds of outage probability and bit error rate (BER) are derived. Asymptotic outage probability and BER that are valid for high signal-to-noise ratio regime are also analyzed, which can provide important insights on the impact of system parameters. The analytical results show that the full diversity order N + 1 can be achieved by both proposed schemes. Simulation results are also presented to corroborate the analysis. Copyright (c) 2014 John Wiley & Sons, Ltd.