Simulation of the multipath performance of FM-DCSK digital communications using chaos

In binary FM-differential chaos shift keying (FM-DCSK), each information bit is mapped to the correlation between two pieces of a constant-amplitude frequency-modulated waveform. The receiver determines the correlation (which is proportional to the energy per bit) in order to demodulate the received signal. Since the application of FM ensures constant energy per bit, the noise performance and data rate of FM-DCSK are superior to any other chaotic modulation technique in the literature. Because of their broadband nature, chaotic modulation schemes have potentially better performance in multipath environments than modulation schemes based on sinusoids. This work compares the simulated performance of BPSK and FM-DCSK in typical multipath configurations. The previously conjectured advantage of a broadband chaotic signal in the presence of deep selective fading is verified