A distributed relay selection algorithm for cognitive radio ad-hoc networks
Yun Li, Ruifeng Zhang, Chonggang Wang, Ali Daneshmand, Xiaohu You · 2010
Cognitive radio has been proposed as the means for secondary users to promote the efficient utilization of spectrum. Meanwhile, Cooperative relay is well known as a powerful technology to combat signal fading in a wireless medium. In this paper, we discuss a new relay selection algorithm for cognitive radio ad-hoc networks by utilizing cooperative relay to improve spectrum diversity and transmission rate. We define a cooperation-table which considers several aspects including channel gain, channel available probability and spectrum heterogeneity of secondary nodes. Based on this cooperation-table, a new distributed relay selection algorithm is proposed that choose a relay node to maximize the transmission rate of the source node. Simulation results demonstrate the effectiveness of the relay selection algorithm.