BER Analysis in Dual Hop Differential Amplify-and-Forward Relaying Systems with Selection Combining Using M-ary Phase-Shift Keying over Nakagami-m Fading Channels

Abstract

In this work, a dual-hop relaying system using the differential amplify-and-forward relaying scheme along with post-detection selection combining techniques is proposed. This technique used previously received samples to estimate current fading gain in a branch in order to accomplish a cooperative diversity at cases that exclude the need of having explicit channel estimation. A closed-form expression for the exact end-to-end bit error rate of the communication system, assuming M-ary phase-shift keying constellation over independent non-identical Nakagami-m fading channels, is derived. Different fading parameters were used to validate the correctness of our end-to-end bit error rate tight expression.