A ZCZ-CDMA system with BFSK modulation

Authors:
Jincheng Huang;Shinya Matsufuji;Takahiro Matsumoto;Noriyoshi Kuroyanagi
Affiliations:
Yamaguchi University, 2-16-1 Tokiwadai, Ube, Yamaguchi, 755-8611, Japan;Yamaguchi University, 2-16-1 Tokiwadai, Ube, Yamaguchi, 755-8611, Japan;Yamaguchi University, 2-16-1 Tokiwadai, Ube, Yamaguchi, 755-8611, Japan;Chubu University, 1200 Matsumoto, Kasugai, Aichi, 4877-8501, Japan
Venue:
International Journal of Communication Systems
Year:
2012

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Abstract

A quasi-timing synchronous code division multiple access (CDMA) system called ZCZ-CDMA, which uses a set of sequences with a zero-correlation zone called ZCZ code as a spreading code, is useful for short-range wireless communications because of its excellent properties such as co-channel interference-free performance, simplified hardware design, and low transmit power as well as fast frame synchronization capability. In this paper, a ZCZ-CDMA system with binary frequency-shift keying (BFSK) modulation called BFSK-ZCZ-CDMA is proposed. This system is characterized by using a pair of balanced ZCZ codes for spreading and transmitting the two spread components over the respective keying carrier frequencies. Its bit error rate performance, compared with those of existing BPSK-ZCZ-CDMA, ASK-ZCZ-CDMA, and CDMA systems using the other spreading codes, is evaluated in theory and simulation. The bit error rate performance of the three ZCZ-CDMA systems over additive white Gaussian noise and Rayleigh fading channels are formulated. It is proved that BFSK-ZCZ-CDMA is much more robust in anti-fading performance and low transmit power in such an environment that fading distributions on the keying frequencies are independent mutually. Fading versus frequency characteristics are also investigated. Copyright © 2012 John Wiley & Sons, Ltd.