Performance Evaluation of a Cooperative OFDM System with implementation of DAF and AAF Relaying Protocols on Color image transmission

In this paper, we investigate the performance of a single-relay cooperative wireless communication system with implementation of Orthogonal Frequency division multiplexing technique under Amplifyand-Forward (AAF) and Decode-and-Forward (DAF) relaying protocols on color image transmission. The system under investigation incorporates four conventional signal combining schemes such as Equal Ratio Combining (ERC) and Fixed Ratio Combining (FRC), Signal to Noise Ratio Combining (SNRC) and Enhanced Signal to Noise Ratio Combining (ESNRC) under BPSK and QPSK digital modulations. In the present study, results of BER simulation in AWGN and Raleigh fading channels shows that the system outperforms in ERC combining scheme as compared to others (FRC, SNRC and ESNRC) under BPSK digital modulation and AAF relaying protocol. It is observed that a quite satisfactory system performance is achieved in ERC scheme under AAF relaying protocol with BPSK digital modulation. It has been anticipated from the simulation study that the performance of the cooperative OFDM communication system degrades with the increasing of noise power and level of modulation.