Relay selection scheme based on propagation delay for cooperative underwater acoustic network

Abstract

In recent research of wireless communication, the concept of cooperative diversity has been put forward and used widely. A number of transmission schemes designed for radio communications could not be directly applied to underwater network, where channel characteristics are more complicated. In this paper, we consider a situation comparatively closer to the realistic underwater acoustic communication and investigate the relay selection problem. Considering the long propagation delay caused by low speed of sound, we design a cooperative transmission scheme. In this scheme, the network chooses the optimal relay or the suitable number of nodes adapting to the changes of underwater circumstances. Then the signal-to-noise ratio (SNR) is added to the criterion of relay selection to realize a more effective algorithm.