CODE-DIVISION MULTIPLE-ACCESS SCHEMES FOR TERRESTRIAL AND SATELLITE MOBILE COMMUNICATION-NETWORKS - MODELING AND PERFORMANCE EVALUATION

This paper deals with the modeling and performance evaluation of diffe rent Code Division Multiple Access schemes suitable for applications i n terrestrial and satellite mobile communication networks. The use of particular propagation channel models and the relative sensitivity of different demodulation schemes to their parameters are the subject the paper is focused on. In particular, an extension to the case of wideb and communications of Lutz's satellite channel model is presented. The main goal is to analyze how the increased interference level, typical of a multipath environment, can influence different demodulator archi tectures in different propagation conditions. Perfectly coherent and d ifferential modulation methods are employed with conventional and RAKE receivers to derive the error rate performance by computer simulation s. Some issues concerning the characterization of the propagation chan nel models in the case of the RAKE receiver are also investigated and discussed.