Relay selection in amplify and forward protocol utilizing low bandwidth

Relay Selection (RS) is a strategy that has widely been studied for many protocols. In this paper, relay selection is studied for amplify and forward protocol. RS is used to enhance the performance of cooperative relay networks. The spectral efficiency of relay selection acts better when compared to energy efficiency. Moreover, RS will perform better when the number of hops between the source and the destination is less. There are many methods used at the receiver end such as Maximal Ratio Combining (MRC) selection combining etc. In this paper., selection combining is employed at the receiver since MRC is recently proved to have many drawbacks in cooperative relay networks. After performing relay selection., those users having signal to noise ratio (SNR) greater than the threshold value are selected.