Distributed network beamforming with a multi-antenna receiver

We consider the problem of distributed beamforming in a relay network, which consists of a single-antenna transmitter, a multi-antenna receiver, and multiple single-antenna relays. Assuming that the channel state information (CSI) is available, our goal is to maximize the destination quality-of-service (QoS) under the total relay transmitted power constraint. Using the semi-definite relaxation (SDR) technique, the problem is turned into a convex semi-definite programming (SDP) problem, which can be solved efficiently using interior point methods. Simulation results show that the proposed relay network beamforming approach offers considerable performance improvements as compared to the single-antenna receiver case.