BER performance of DS-CDMA communications for continuous phase modulation and various binary code families

Continuous phase modulation has been favorably considered among other modulation types for use in DS-CDMA communications due to its constant envelope and compact spectrum. The purpose of this paper is two-fold. First, a theoretical framework based BER performance calculation of a DS-CDMA system with CPM modulation is presented. Our simulations validate that analytical methodology. Second, BER performances of various constant power spreading code families (binary valued Walsh, Gold, Walsh-like 7/8-length codes) are simulated for BPSK and CPM modulations. It is shown that CPM signaling based systems outperform BPSK modulation for all scenarios considered.