A link selection strategy for cooperative adhoc networks

Cooperative adhoc networks become popular because of their ability to provide reliable communication. In this paper, we consider a cooperative adhoc network consisting of a source node, two relay nodes and a destination node. The source intends to transmit it´s data through relays to the destination with the help of decode and forward relaying technique. We employ the weighted selection combining at the destination which chooses either the weighted source-to-relay1-to-relay2-to-destination (S-R1-R2-D) link or source-to-destination (S-D) link depending upon the instantaneous signal-to-noise ratio. We have derived the conditional symbol error probability (SEP) of S-D and S-R1-R2-D links with binary phase-shift keying for a flat, slow Rayleigh fading channels. Further, we develop an algorithm to investigate the performance of this cooperative adhoc networks in terms of SEP. Results show that the cooperation among the nodes improves the performance of adhoc networks when compared to point-to-point links.