A novel MIMO relay FM-DCSK UWB system for low-rate and low-power WPAN applications

In this paper, we propose a novel multi-access multiple-input multiple-output (MIMO) relay frequency-modulated differential chaos shift keying (FM-DCSK) ultra-wideband (UWB) system with decode-and-forward (DF) relaying protocol, where the relay intelligently employs multiple antennas to greatly strengthen the robustness against signal fading in wireless networks. Simulation results show that the bit error rate (BER) performance of the proposed system is remarkably better than the conventional multi-access FM-DCSK UWB systems under indoor residential environments of the IEEE 802.15.4a standard by means of obtaining the spatial diversity gain. Furthermore, the influence of antenna number of relay to the proposed system is also investigated to provide a good compromise between the system performance and implementation complexity. For these advantages above, the proposed system can be seen as a viable alternative to other FM-DCSK UWB schemes for the low-rate and low-power applications in wireless personal area networks (WPAN).