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A Method of Constructing Phase Spreading Sequences for CPM‐CDMA Systems
Author(s) -
MORIOKA KAZUYUKI,
ASANO DAVID
Publication year - 2015
Publication title -
electronics and communications in japan
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.131
H-Index - 13
eISSN - 1942-9541
pISSN - 1942-9533
DOI - 10.1002/ecj.11755
Subject(s) - code division multiple access , phase shift keying , spread spectrum , computer science , electronic engineering , modulation (music) , minimum shift keying , computer network , engineering , bit error rate , channel (broadcasting) , physics , acoustics
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 ofB b T cin 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.