Abstract
Differential-chaos-shift-keying (DCSK) modulation has drawn much attention in the past two decades due to its simple realization and excellent anti-multipath ability. In this paper, we conduct an in-depth study on the N-user DCSK cooperative communication (CC) systems over multipath Nakagami fading channels, where three multiple-access (MA) schemes, i.e., variant-delay MA (VDMA), code-division MA (CDMA), and Walsh-coded MA (WCMA), are considered. To be specific, we firstly introduce the frameworks of the aforementioned three MA-DCSK-CC systems, then analyze and compare the error performance of these MA-DCSK-CC systems. Analytical and simulated results illustrate that the WCMA-DCSK-CC system enables more desirable error performance with respect to the VDMA and CDMA ones. Consequently, the WC-based scheme stands out as a very good candidate for the low-power and low-complexity chaos-based cooperative networks.1
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