Using LDPC codes to enhance the performance of FM-DCSK

Frequency-modulated differential chaos shift keying (FM-DCSK) is a non-coherent modulation and demodulation technique, which uses a chaotic signal as the carrier. Due to the inherent broadband nature, its good performance of anti-multipath interference is quite promising in wireless communications. In order to improve the overall performance of this chaos-based system, LDPC (low density parity check) codes are proposed to use for enhancing the FM-DCSK communication system. Through system design and simulations, it is shown that the enhanced system is superior to that without LDPC codes by at least 8 dB over an AWGN channel. Moreover, the longer the frame, the greater its coding gain.