A Constant Amplitude Multiplexing for Multi-Code DS/CDMA systems

摘要

In general, the signal of the conventional multi-code CDMA system has large fluctuations, and these fluctuations increase nonlinear distortion at a high efficient nonlinear amplifier. To reduce nonlinear distortion, the amplitude fluctuations of the signal should be reduced as much as possible, so majority multiplexing and constant amplitude coding are developed. But, as the system uses more codes, both methods make the system more complex, because the data bits are coded several times. The proposed system does not need the additional coding and just needs simple sign operations. And it uses the same simple receiver as the conventional multi-code system.