The Performance Enhancement of Dual Relay Cooperative Wireless Network in Rician Fading Channel
Imran Ullah Khan1, Tan Chong Eng2
1Imran Ullah Khan, Faculty of Computer Science and Information Technology, University Malaysia Sarawak (UNIMAS).
2Tan Chong Eng, Faculty of Computer Science and Information Technology, University Malaysia Sarawak (UNIMAS).
Manuscript received on September 23, 2012. | Revised Manuscript received on October 18, 2012. | Manuscript published on October 30, 2012. | PP: 166-171 | Volume-2 Issue-1, October 2012. | Retrieval Number: A0758102112/2012©BEIESP
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© The Authors. Blue Eyes Intelligence Engineering and Sciences Publication (BEIESP). This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/)
Abstract: The aim of this study was to investigate the performance enhancement of dual relay cooperative wireless network by using Amplify and Forward (AF) relaying protocol in Rician fading channel with different K-factors. The bit error rate (BER) and BER gain by using AF scenario in Rician fading channel are derived. The results obtained from the proposed models are compared to AF scenario in Rayleigh and Nakagami-m fading channels. It is found that the proposed BER model of AF cooperative scenario outperform as compared to non cooperative scenario in terms of less BER. It is indicated that at lower values of K (i.e., at severe fading as well as weak LOS reception), the proposed model of AF scenario in Rician fading channel showed less BER as compared to AF scenario in Rayleigh fading channel (i.e., K=0, which denotes severe fading as well as the scenario where LOS component completely vanishes and reception becomes non-LOS). It is shown that at severe fading (i.e., at lower K values) while keeping lower signal to noise ratio (SNR) the proposed model showed less BER. However, the proposed model shows constant BER as K approaches to infinity (i.e., the BER performance approaches AWGN channel error performance) while keeping low SNR values .It is also revealed that with the increase in K values 1 to 60 (i.e., decrease in severe fading to lowest fading as well as an increase from weak to strong LOS reception) the proposed model showed less BER and high BER gain as compared to Nakagami-m channel while keeping low values of SNR (i.e., 1-18dB).
Keywords: Bit error rate, bit error rate gain, Rician fading channel, cooperative network.