A Method of Constructing Phase Spreading Sequences for CPM‐CDMA Systems

Abstract

SUMMARY In this paper, a construction method for phase spreading sequences that is suitable for CPM‐CDMA systems is proposed. Using these sequences, the performance of asynchronous CPM‐CDMA systems with traditional BPSK/OQPSK‐CDMA systems and the trade‐off between the spreading factor and modulation parameters are considered. Numerical results show that the optimal modulation index for CPFSK‐CDMA systems is h=0.5 and the performance is better for lower values of BbTc in GMSK‐CDMA systems. Also, we found that the user capacities of MSK‐CDMA systems are 2.3 times larger than those of BPSK/OQPSK‐CDMA systems.