Rejection of Narrow-Band Interference in PN Spread-Spectrum Systems Using Transversal Filters

In the presence of narrow-band interference, the performance of PN spread-spectrum communication systems can he improved by using various interference rejection filters. In this paper, both prediction error filters and transversal filters with two-sided taps are used and the performance of each is analyzed. Analytic expressions for the signal-to-noise ratio improvement factors are obtained. If the frequency of the jamming tone is near the carrier frequency of the spread-spectrum signal, the performance of the transversal filter with two-sided taps is better than that of the prediction error filter with the same number of taps.