VOLTERRA FILTER APPLICATION IN DS-SS RECEIVER FOR BROADBAND AND NARROWBAND INTERFERENCE SUPPRESSION

Dušan Kocur - Rudolf Zetík - Pavol Galajda

   Direct sequence spread spectrum (DS-SS) transmission systems offer a promising solution to an overcrowded frequency spectrum amid the growing demand for mobile and personal communication service. The overlay of DS-SS signals on the existing broadbands and narrowbands implies strong interference for DS-SS systems. In this paper, it will be shown how the application of linear or non-linear estimators in DS-SS receivers can suppress this interference. In our consideration, Wiener filters (WF) and Volterra filters (VF) will be used as estimators. In order to demonstrate the ability of the discussed DS-SS receivers to suppress interference, a number of computer experiments will be done. The results of these experiments will show that the application of VF in DS-SS receivers can outperform the DS-SS receivers based on simple application of the matched filter (MF) or on the WF application in a significant way.

Keywords: DS-SS receiver structures, Volterra filter, Wiener filter, broadband and narrowband interference

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