Bandwidth efficiency analysis of cooperative communication with Reactive Relay Selection

Cooperative communication systems (CCS), which make use of the intermediate relays between the transmitter and the receiver, have been employed as an effective technique to combat the channel fading and to enhance the system performance. Cooperative systems have some drawbacks such as high latency and low bandwidth efficiency. To alleviate the negative effects of these factors, relay selection criteria is employed in cooperative communication systems to increase overall bandwidth efficiency and decrease latency. Relay selection in the cooperative systems enables the source to cooperate with the single relay node rather than multiple relay nodes which reduce the overall bandwidth efficiency. To prestige the benefit of cooperation, an efficient relay selection method is needed. In this paper, we propose a novel relay selection method, maximum link source-relay-destination (MLSRD) method in cooperative communication systems. The design goal of MLSRD is to improve the bandwidth efficiency. The result shows the MLSRD outperform cooperative communication systems without MLSRD in the term of the Bandwidth efficiency.