Analysis of UWB Interference to MPSK Narrowband Receivers

This paper studies the in-band interference of time-hopping spread spectrum (TH-SS) ultra-wideband (UWB) signals to narrowband receivers. Based on the analysis of general power spectral density (PSD) of TH-SS UWB signal, the interference of UWB signal is partitioned into two parts: (1) additive white Gaussian noise interference, and (2) jamming tone interference. Following this framework, a novel analytical symbol error rate (SER) evaluation method for binary phase-shift keying (BPSK) and M-ary phase-shift keying (MPSK) signals subject to UWB interferences is proposed and corresponding simulation results are demonstrated. It is shown that as the number of in-band jamming tones increases, the UWB interference effect tends to be closer to the effect of the equivalent Gaussian noise. When there is only one UWB tone interferer within the narrowband receiver bandwidth, and when the signal-to-interference-and-noise ratio is higher than a certain value, the narrowband symbol error rate decreases as the relative tone power portion in the overall interference and noise power increases.