NR-DCSK-Based MIMO Chaotic Communication System

In this paper, noise reduction differential chaos shift keying (NR-DCSK)-based multiple-input–multiple-output (MIMO) chaotic communication system is proposed. We consider a transceiver scheme that uses a different chaotic sequence at each transmit antenna and transmits omnidirectionally. In the transmitter side, we use β/P chaotic samples as reference sequence which is then repeated P times to generate the required reference sequence of length β. At the receiver side, a moving average filter of size P is used to reduce the noise variance and improve the efficiency of the system. The resulting filtered signal is then correlated and combined with equal gain combining to yield the transmitted bit. Bit error rates for additive white Gaussian noise (AWGN) channel are analytically derived. These results are compared with the simulated results to validate the expressions derived. Results show that NR-DCSK-based MIMO system is better than the conventional M-DCSK-based chaotic communication system.