Performance of a nonlinear FH-DPSK spread-spectrum receiver with multiple narrow-band interfering signals

An analysis of the effect of multiple narrow-band interfering signals on the probability of error in a frequency-hopped differential phase shift keyed (FH-DPSK) spread-spectrum communication system with a nonlinear receiver is given. In this analysis it is assumed that the sum of the outputs from an n-subchannel receiver is a Gaussian random variable. Subject to this assumption, numerical evaluations of the probability of error for both nonfading and Rayleigh fading channels are presented and compared with those of a linear receiver. The results indicate that the performance of a nonlinear receiver is better than that of a linear receiver for any signal-to-interference ratio.