Weight design of AF MIMO relay system with perfect channel state information

In ITS (intelligent transport system), the communication quality could be degraded by the existence of shielding objects such as large vehicles and buildings. The relay-aided transmission is an effective solution to this problem which keeps the reliability of inter-vehicle and/or road-to-vehicle links which directly concern to the safety of the transportation. This paper considers the weight design problem of two-hop MIMO AF (amplify and forward) multiple relay system in which source, relays and destination are equipped with multiple antenna element. Assuming perfect CSI (channel state information), optimization methods are presented based on the maximum SNR (signal to noise ratio) criterion for three cases, variable relay weight with and without data sharing among relays, and fixed relay weight scenarios. Through computer simulations, the effectiveness, features and problems are investigated for each relaying strategy.