This paper considers an orthogonal frequency division multiplexing (OFDM) based two-way cognitive radio (CR) multiuser multiple relay network. The target is to jointly solve the problem of power allocation, subcarrier assignment, selection of best relay/s, and the sub-carrier pairing at the relay nodes. The aim of the optimization is to maximize the end-to-end sum rate of the network under exclusive sub-carrier allocation constraint, maximum power constraint at each node, and per carrier based primary user interference constraint. We solve the mixed integer programming problem by duality approach and obtain joint optimization solution. Further, we also propose a suboptimal algorithm to reduce the overall complexity with little sacrificing on performance. At the end, simulation results are provided to show the performance comparison of our proposed schemes.
展开▼
