Discrete-time Modeling and Numerical Evaluation of BER Performance for A BPSK-based DCSK-Walsh Coding Communication System over Multipath Rayleigh Fading Channels

Authors: Thang Manh Hoang*


This paper investigates the use of binary phase shift keying (BPSK) modulation for multiple-access communication systems based on differential chaos shift keying-Walsh Coding (DCSK-WC). This aims at converting the chaotic-modulated signal from low-frequency baseband into high frequency band before being transmitted on the channel. In the transmitter, a chaotic sequence is transformed into the non-return-to-zero (NRZ) form which is then fed into the BPSK modulation. The output of modulation, i.e., NRZ-Chaos/BPSK signal, is used as a spreading code in the DCSK-WC modulation. The process of data recovery in the receiver is performed by means of the correlation calculation and energy detection as in the conventional DCSK method. The mathematical model in discrete-time domain describes the operation of the transmitter and receiver over multipath Rayleigh fading channels. The Bit-error-rate performance of the system is evaluated by numerical simulation. The results show that the proposed BPSK/DCSK-WC system allows adjusting the operating frequency band with the use of BPSK, while still keeping the performance equivalent to that of the conventional one.


BPSK, DCSK, Multiple access, Walsh code, Multipath channel.
Pages : 99-103

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