Abstract

RONCAGLIOLO, P.A.  and  MURAVCHIK, C.H.. Digital DS-CDMA detection in impulsive noise: base-band vs. band-pass nonlinear processing. Lat. Am. appl. res. [online]. 2010, vol.40, n.1, pp.35-38. ISSN 0327-0793.

In the context of DS-CDMA detection, a digital base-band model for the received signal after chip-matched filtering, is often adopted. Nonlinear treatment of these samples for robust detection in impulsive environments has been already proposed. In this paper we study the advantages of band-pass non-linear detection schemes for DS-CDMA receivers, over those in base-band. We consider for both schemes i) an impulsive noise model with independent a-stable distributed sequences and ii) a hard-limiter as memoryless nonlinearity. Probability of error and asymptotic relative efficiency expressions are given, with simulations that validate them. Results shown that band-pass non-linear detection is preferable.

Keywords : DS-CDMA; Nonlinear Detection; Impulsive Noise; a-stable Distribution; Hard Limiter.

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