Design and Performance Analysis of a New Multiresolution M-ary Differential Chaos Shift Keying Communication System

Abstract

new multiresolution (MR) M-ary differential chaos shift keying (DCSK) modulation scheme is proposed in this paper. It is a promising technique to provide different quality of services (QoS) for transmitted bits within a symbol according to their different bit error rate (BER) requirements based on the principle of non-uniformly spaced constellations. The new system not only is simple, but also provides better anti-multipath fading performance against various spreading factors, which inherits the advantages of the conventional DCSK system. Furthermore, the proposed scheme and its multicarrier version further increase spectral efficiency and use lower energy consumption at the same bandwidth as compared to the conventional DCSK and its multicarrier (MC- DCSK) system. Explicit BER expressions of the new system are derived and analysed over additive whiteGaussian noise (AWGN) aswell as multipath Rayleigh fading channels .All simulation results verify the prominent advantages of the new scheme and the accuracy of the new analytical approach.