This paper presents a novel method for determination of the general probability distribution of a received differential phase corrupted by both continuous tone jamming and Gaussian noise. An alternative and yet simple expression is derived for this general probability distribution. As an example of its application, we analyze the error performance of a general uncoded SFH/DPSK system under partial-band multitone jamming.

In this paper, we propose a new technique for rejection of narrowband interference based on multiple symbol detection of differential phase shift keying (PSK). Our proposed technique employs a special signalling or vector coding scheme which is shown to be optimum against narrowband interference under certain conditions. As an example of application, we apply our proposed technique to a SFH/DPSK system which is suitable for high speed spread spectrum communications such as a wireless LAN (local area network). Its BER (bit error rate) performance in both narrowband interference and AWGN (additive white Gaussian noise) which may model the background noise is evaluated. We show that even in the worst case narrowband interference, our proposed technique can offer a significant gain in the power ratio of signal to narrowband interference.

We propose a new technique for rejection of narrow-band interference (NBI) based on multiple-symbol detection of coherent or differential phase-shift keying (DPSK). We first show that the direct use of multiple-symbol detection offers poor performance when NBI is dominant. Our proposed technique employs a special signaling or coding scheme which is shown to be robust against NBI. The evaluation of bit-error rate (BER) shows significant performance improvement in NBI vis-a-vis direct multiple-symbol detection. When viewed as a coding scheme, the proposed signaling scheme is significantly simpler for achieving the same coding gain than conventional error correction codes.