A General Model for Performance Evaluation in DS-CDMA Systems with Variable Spreading Factors

Franco CHIARALUCE; Ennio GAMBI; Giorgia RIGHI

doi:10.1093/ietcom/e91-b.2.466

Regular Section

A General Model for Performance Evaluation in DS-CDMA Systems with Variable Spreading Factors

Franco CHIARALUCE, Ennio GAMBI, Giorgia RIGHI

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Keywords: direct sequence-spread spectrum, wideband code division multiple access, spreading sequences, multipath, BER performance

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2008 Volume E91.B Issue 2 Pages 466-478

DOI https://doi.org/10.1093/ietcom/e91-b.2.466

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Abstract

This paper extends previous analytical approaches for the study of CDMA systems to the relevant case of multipath environments where users can operate at different bit rates. This scenario is of interest for the Wideband CDMA strategy employed in UMTS, and the model permits the performance comparison of classic and more innovative spreading signals. The method is based on the characteristic function approach, that allows to model accurately the various kinds of interferences. Some numerical examples are given with reference to the ITU-R M. 1225 Recommendations, but the analysis could be extended to different channel descriptions.

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