Joint multiple relay selection and power optimization in two-way relay networks

In this paper, we propose a joint multi-relay selection and power optimization technique to improve the system performance of the two-way cooperative networks. Proposed method has a reduced computational load for the multiple relay selection problem compared to the optimum solution which is based on selecting the “best” relays. Moreover, since the relay selection is performed iteratively until a threshold SNR is reached, power optimization is achieved at every iteration as well. Hence, we attain an improved error performance using the least possible number of relays, and as such with lower power consumption. The main contribution of this study is that the multi-relay selection in two-way cooperative networks is achieved with a lower computational cost than the similar methods in the literature.