Performance analysis of DCSK modulation with diversity combining not requiring channel state information

This paper presents the performance analysis of differential chaos shift keying (DCSK) modulation with diversity combining. First, the performance analysis of DCSK modulation with selection combining (SC) at the receiver, i.e., DCSK-SC, is presented. In particular, two DCSK-SC schemes are presented; conventional DCSK-SC scheme which is based on channel state information (CSI) and DCSK post-detection SC scheme which does not require CSI at the receiver. The results show that the conventional DCSK-SC scheme outperforms the later scheme, but, it requires channel estimation which increases the circuit complexity. On the contrary, the DCSK-SC scheme based on post-detection combining does not require channel estimation and thus it does not exploit the benefit of DCSK modulation. Secondly, the performance analysis of DCSK modulation with post-detection equal-gain-combining (EGC) at the receiver, i.e., DCSK-EGC is presented. Performance of the DCSK-SC and DCSK-EGC schemes are evaluated for Nakagami-m fading channel. Numerical and simulation results are obtained and plotted for the parameters of interest.