Abstract
A less complex system by integrating non-coherent differential amplitude and phase shift keying modulation with multi-carrier code division multiple access (DAPSK-MC-CDMA) is introduced. The proposed DAPSK-MC-CDMA system can reduce the system complexity and also maintain a good performance and high-spectral efficiency. The paper firstly shows that the performance degradation caused by the multiple access interference (MAI) and the carrier frequency offset can be effectively controlled in a DAPSK-MC-CDMA system. Simulation results illustrate that both the MAI and the carrier frequency offset in the DAPSK-MC-CDMA is much less sensitive than the conventional MC-CDMA system. Furthermore, using the DAPSK modulation, the detection methods of equal gain combining, maximum ratio combining, and minimum mean square error combining now can be used in the multiple-ary DAPSK-MC-CDMA system.
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