Enhancement of Amplify-and-Forward Cooperative Relay Technique over Nakagami Fading Channel

Abstract

As demand for wireless communication grows, its system is usually affected by channel impairment that degrade the performance. The traditional Amplify-and-Forward (AF) cooperative relaying technique, used to address the problem, often performs poorly because it amplifies not just the signal but also the noise. Therefore, this study introduces an enhanced AF relaying technique that uses spectral subtraction to reduce noise amplification. A signal is transmitted from the source through a Nakagami-m fading channel. At the relay node, the received signal undergoes spectral subtraction to remove noise, and is then amplified using adaptive gain. The amplified signal is then forwarded to the destination via multiple paths. The signals are combineddestination combines these signals using a hybrid Selection Combiner-Maximal Ratio Combiner (SC-MRC) to improve overall signal quality. The mathematical analysis of Bit Error Rate (BER) and Throughput (TP) shows that this enhanced AF technique significantly outperforms the traditional method. It achieved a 25.65% reduction in BER and an 82.83% increase in TP, demonstrating that it is a viable solution for improving the performance of cooperative communication systems.