A study on ZCZ-CDMA systems in Short-Range Wireless communications

ZCZ-CDMA systems, which can remove co-channel interference by means of synchronization control and use of ZCZ codes, are useful for Short-Range Wireless communications. This paper investigates BER performance on ZCZ-CDMA systems using ASK, PSK, and BFSK modulations. This paper proposes a ZCZ-CDMA demodulation using signals which result from the combination of the preceding signal and the delayed signal. Because the preceding signal and delayed signal contain the same information, the path diversity gain is obtained by combining them. Computer simulations confirm that the BER performance is improved by combining the desired signals over Multipath fading channels.