Design And Performance Analysis Of A Novel Trellis-coded Differential Chaotic Modulation System

In this paper,a novel coded modulation scheme named Trellis-Coded Differential Chaotic Modulation(TC-DCM)is proposed,which combines trellis codes with M-ary Differential Chaotic Shift Keying(M-DCSK).The new scheme not only reduces the multipath interference efficiently due to its inherent spreading property,but also avoids the use of Channel State Information(CSI),making the corresponding receiver design simpler and more suitable for some band-limited channel scenarios especially with severe multipath propagation where the CSI is hard to obtain,such as Underwater Acoustic communication systems and satellite communication systems.Besides,because there is no need for exact synchronization,despreading and the Rake receiver at the receiver,the new scheme offers a simple hardware design and is very robust against channel distortion,which is a good choice to utilize in applications where low cost,low energy consumption and high resistance against multipath fading are required like underwater acoustic sensor networks.Firstly,a detailed introduction of the Trellis-Coded Modulation system and some key techniques utilized in this system are given.Secondly,the BER performances of M-DCSK system are derived and verified over Additive White Gaussian Noise(AWGN)channels and Rayleigh flat fading channels,respectively.The architecture of the TC-DCM system is presented.And the theoretical BER bounds of the new scheme have been derived over AWGN and Rayleigh flat fading channels.Compared to the corresponding uncoded systems with the same bandwidth,the TC-DCM systems with different states and different rates can obtain obvious coding gains over AWGN channels.Furthermore,the outstanding performances of the proposed scheme are confirmed by comparing it to the TCM Direct-Sequence Spread-Spectrum(TCM DS/SS)system with the same bandwidth efficiency over multipath Rayleigh fading channels without CSI.And to further improve the performances of the system over the fading channels,the optimized trellis code design rules are proposed.