A Distributed Iterative Transceiver Beamforming Algorithm for Multipair Two-Way Relay Networks

The transceiver beamforming design problem is studied in this paper for a multi-pair two-way distributed relay network, where multi-antenna users in one user group communicate with their partners in the other user group via distributed single-antenna relay nodes. An iterative algorithm is proposed where transmit and receive beamformings are performed at user nodes, and relay nodes have their own simple strategies for deciding the weights. The computation tasks are distributed among each user and relay node, through which high computation efficiency can be ensured. By coordinating them together, satisfactory performance is obtained when relay number is low and significant performance enhancement is also achieved for a large relay number.