A Novel Selection Combining Technique for Multi Relay Cooperative Communication System Using Decode and Forward Protocol

K Kavitha¹, A Kumaresan²

^1,2Kumaraguru College of Technology, Coimbatore, India

Abstract

The wireless data communication system demands robust methodologies to combat the effect of fading to increase the throughput. The paper proposes a novel selection combining algorithm for multi relay cooperative system using decode and forward algorithm. Cooperative communication is one of the promising diversity techniques which have attracted the attention of the researchers currently. In the conventional cooperative communication system, the data is transmitted through ‘N’ number of relays to the destination. The signals received from all the relays are combined to decode the data at the destination.. In Literature, there are various combining schemes such as equal gain combining, maximum ratio combining scaled selection combining techniques. In the conventional selection combining, only one relay signal is selected based on its channel state information (CSI). In this, the source to relay CSI is not utilized. It has been proved that by utilizing full CSI the error performance could be improved of the selection combining algorithm. In the proposed system, instantaneous signal to noise ratio (SNR) is calculated at the relay stations and it is used to take the decision whether to decode the signal and forward (DF) the same to destination or to be dropped. Only the signals with SNR above the threshold from the received relay signals is considered for combining. The performance of the proposed system with maximum ratio combining and scaled selection combining has been analyzed. In this system the error performance is improved by using selected relay signal, whereas only one relay is used in the conventional selection combining system.

Keywords

• Decode and forward (DF), M-ary phase-shift keying (MPSK), Rayleigh fading, Threshold selection combining, Symbol error probability (SEP)

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Cite this Article as Follows

K Kavitha, A Kumaresan. A Novel Selection Combining Technique for Multi Relay Cooperative Communication System Using Decode and Forward Protocol. International Conference on Innovative trends in Electronics Communication and Applications 2014. Vol. 1. Chennai: Association of Scientists, Developers and Faculties, 2014. 315-320. Print.