The effect of propagation on wideband DS-CDMA systems in the suburban environment

Direct sequence code division multiple access (DS-CDMA) methods are being used by the cellular industry to provide a multiple access method with improved performance. Recently wideband CDMA systems have been proposed, the wideband waveforms require on the order of 5 to 15 MHz of bandwidth. In this paper the effect of channel propagation on the performance of wideband systems is examined. Since traditional narrowband analysis will not be sufficient for these systems wideband methods based on calculating the time domain channel impulse response are employed. The wideband channel response is modeled using a broadband parabolic equation propagation model. Presently, only two-dimensional range dependent propagation is considered, contributions due to out of plane scattering are not included.