Transmit Beamforming in Cooperative Networks

Cooperative relay communication systems has been extensively studied in recent years due to their ability to provide more reliable communications through enhanced diversity and to extend the range of the communication system. Equipping communication terminals with multiple antennas have similar advantages. In this paper, the authors look at a cooperative diversity system where the source node is equipped with multiple antennas. Assuming that the channel state information is available, they derive the optimal beamforming vector to maximize the capacity of the system. They will compare the optimal beamforming solution with a partially optimized solution.