Sub-optimal strategies in MIMO multiple relay channels

Joint optimization of cooperative relays in MIMO multiple relay aided communication system is discussed in this paper. Because the instantaneous channel state information of all source-relay channels and all relay-user channels is difficult to get at each relay node, a sub-optimization solution is designed according to the channel state information of single relay only. Simulation results show that the sub-optimization solution can achieve better system performance as compared to traditional equal power transmission scheme. Meanwhile, the complexity of the former is achievable.