Performance of MIMO Relay DCSK-CD Systems over Nakagami Fading Channels

摘要

A multi-access multiple-input multiple-output (MIMO) relay differential chaosshift keying cooperative diversity (DCSK-CD) system is proposed in this paperas a comprehensive cooperation scheme, in which the relay and destination bothemploy multiple antennas to strengthen the robustness against signal fading ina wireless network. It is shown that, with spatial diversity gains, the biterror rate (BER) performance of the proposed system is remarkably better thanthe conventional DCSK non-cooperation (DCSK-NC) and DCSK cooperativecommunication (DCSK-CC) systems. Moreover, the exact BER and close-formexpressions of the proposed system are derived over Nakagami fading channelsthrough the moment generating function (MGF), which is shown to be highlyconsistent with the simulation results. Meanwhile, this paper illustrates atrade-off between the performance and the complexity, and provides a thresholdfor the number of relay antennas keeping the user consumed energy constant. Dueto the above-mentioned advantages, the proposed system stands out as a goodcandidate or alternative for energy-constrained wireless communications basedon chaotic modulation, especially for low-power and low-cost wireless personalarea networks (WPANs).