Copyright © 2008 The Institute of Electronics, Information and Communication Engineers
Regular Section -- Papers -- Wireless Communication Technologies |
A General Model for Performance Evaluation in DS-CDMA Systems with Variable Spreading Factors
1 The authors are with the Dipartimento di Elettronica, Intelligenza artificiale e Telecomunicazioni (DEIT), Università Politecnica delle Marche, Ancona, Italy. E-mail: f.chiaraluce{at}univpm.it; e.gambi{at}univpm.it; g.righi{at}univpm.it
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.
Key Words: direct sequence-spread spectrum, wideband code division multiple access, spreading sequences, multipath, BER performance
Manuscript received January 17, 2007. Manuscript revised July 27, 2007.
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