Optimization And Analysis Of Differential Chaotic Shift Keying Communication System

In the past few decades,chaotic signals have been fully researched.In the field of communication,researchers use the chaotic signals to construct digital chaotic communication systems as carriers,and have achieved remarkable development.In order to solve the problem that the actual channel synchronization is difficult,the practical chaotic-based communication system generally adopts non-coherent demodulation at receiver.Although it solves the problem of system synchronization,the introduction of chaotic reference sequences greatly reduces the energy efficiency and bandwidth efficiency of the system.In order to further promote the application of differential chaotic shift keying system to channels with limited bandwidth and complex environment,this paper proposes a serial concatenated trellis-coded modulation system(SCTC-DCM)with great coding gain and very low error floor.This system has a lower error floor and better performance than the turbo trellis-coded differential chaotic modulation(TTC-DCM).At the same time,in order to improve the bandwidth efficiency and energy efficiency of the differential chaotic shift keying system,this paper also proposes a Walsh code-based multilevel code multiplexing differential chaotic shift keying system(MCS-MDCSK).Compared with the multilevel code-shifted differential chaos shift keying system(MCS-DCSK),the system has lower complexity per transmission bit and greatly increases system bandwidth,efficiency and energy efficiency.