A New APSK-Based <i>M</i>-Ary Differential Chaos Shift Keying Modulation System
Tingting Fan, Weikai Xu, Lin Wang, Lin Zhang
Abstract
In this letter, a new amplitude phase shift keying (APSK) based M-ary differential chaos shift keying (A-M-DCSK) system is proposed. The theoretical symbol error rate (SER) and bit error rate (BER) expressions of A-M-DCSK system for two constellations are derived and verified for both AWGN and multipath Rayleigh fading channels. Numerical results reveal that A-M-DCSK system provides near or better BER with much lower peak-to-average power ratio (PAPR) as compared to quadrature amplitude modulation (QAM) based M-DCSK (Q-M-DCSK) system. Furthermore, A-M-DCSK system shows better robustness against channel estimation error than Q-M-DCSK system. At last, with APSK constellation rotation, the BER of A-M-DCSK system is enhanced with a slightly increased PAPR.