Distributed beamforming design for SINR balancing approach in cooperative two-way networks based on second-order statistics

We consider a two-way cooperative network consists of two transceivers and a set of relays. Assuming poor direct link between the two transceivers, they can exchange their data only with help of a set of distributed relays. This paper assumes that second-order statistics (SOS) of channel state information (CSI) is available. In this paper we obtain the complex beamforming weights to achieving signal-to-interference-plus-noise ratio (SINR) balancing in transceivers with total transmit power constraint at the relays. For solving the optimization problem, the complex beamforming weights are optimized with using a bisection search method. Simulation results show that increase in certainty about the channel coefficients helps in achieving a better performance in the two-way cooperative network.