Spectral efficiency of CDMA systems with linear MMSE interference suppression

Code-division multiple-access is a promising technique for communication systems. Recently, many demodulation schemes have been proposed which take account of inherent multiple-access interference. In this paper, linear interference suppression as proposed in, e.g,, [1], is compared with conventional demodulation based on power-bandwidth plane. This approach is much more general than the comparison of error rates for specific scenarios as used to be done before. In-case of interference suppression, spectral efficiency is calculated by a combination of analysis and simulation. The coding and modulation scheme used is characterized within power-bandwidth plane for a single-cell scenario as well as for a cellular system. In the latter case, some statements which are valid far the single-cell scenario have to be revised.