Error Performance Analysis of Opportunistic Relaying System Based on DCSK

In this paper, a differential chaos shift keying (DCSK) opportunistic relaying scheme is proposed and the system performance is analyzed over multipath Rayleigh fading channel, where all the relays adopt decode-and-forward (DF) strategy. Considering the effect of the path loss, the best relay is chosen by max-min selection criterion. We derive the probability density function (PDF) of the signal noise ratio (SNR) in each hop, and give the expression of the end-to-end bit error rate (BER). The effects of the number of relays, the propagation distance and the spread-spectrum factor on the system performance are investigated. It is shown that the BER performances are proportional to the number of relays and the propagation distance, while they are inverse ratio to the spread-spectrum factor. Numerical results prove an excellent match between simulations and our analysis expressions.