Volterra filter application in DS-SS receiver for joined wideband and narrowband interference suppression

The direct-sequence spread-spectrum (DS-SS) communication system offers a promising solution to an overcrowded frequency spectrum amid growing demand for mobile communication systems. DS-SS, by its very nature, is an interference-tolerant modulation. However, there are situations where the processing gain is inadequate and interference suppression techniques must be employed. We show how linear or non-linear estimators inserted into DS-SS receivers can be applied for joint wideband and narrowband interference suppression. Non-linear Volterra filters (VF) are used as the estimators. In order to demonstrate the performance properties of the DS-SS receivers, a number of computer experiments were carried out. The results of the experiments show that the VF application in DS-SS receivers can outperform DS-SS receivers based on the simple application of matched filters (MF).