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In this paper, we propose two reconfigurable intelligent surface-aided$M$-ary frequency-modulated differential chaos shift keying (RIS-$M$-FM-DCSK)schemes. In scheme I, the RIS is regarded as a transmitter at the source toincorporate the $M$-ary phase-shift-keying ($M$-PSK) symbols into the FMchaotic signal and to reflect the resultant $M$-ary FM chaotic signal towardthe destination. The information bits of the source are carried by both thepositive/negative state of the FM chaotic signal and the $M$-PSK symbols. Inscheme II, the RIS is treated as a relay so that both the source and relay cansimultaneously transmit their information bits to the destination. Theinformation bits of the source and relay are carried by the positive/negativestate of the FM chaotic signal and $M$-PSK symbols generated by the RIS,respectively. The proposed RIS-$M$-FM-DCSK system has an attractive advantagethat it does not require channel state information for detection, thus avoidingcomplex channel estimation. Moreover, we derive the theoretical expressions forbit error rates (BERs) of the proposed RIS-$M$-FM-DCSK system with both schemeI and scheme II over multipath Rayleigh fading channels. Simulations resultsnot only verify the accuracy of the theoretical derivations, but alsodemonstrate the superiority of the proposed system. The proposedRIS-$M$-FM-DCSK system is a promising low-cost, low-power, and high-reliabilityalternative for wireless communication networks.

Reconfigurable Intelligent Surface-aided $M$-ary FM-DCSK System: a New Design for Noncoherent Chaos-based Communication