Subspace-based approaches for narrowband interference suppression in DS spread spectrum systems

It has been shown that the narrowband (NB) interference suppression capability of a direct sequence (DS) spread spectrum system can be enhanced considerably by processing the received signal via a subspace based prediction error filter. In this paper, a new interference-suppression method utilizing a subspace-based interpolation error filter is presented. The performance of DS spread spectrum communication systems in the presence of NB interference is studied when linear interpolation filters are employed for the estimation and subsequent suppression of the interference. The advantages of linear interpolation filters over linear prediction filters with an identical number of taps are examined.