ON QUATERNARY DPSK ERROR RATES DUE TO NOISE AND INTERFERENCES.

Abstract

A method is presented for computing the error rates of a quaternary, differentially encoded and detected, phase-shift-keyed (DPSK) system with Gaussian noise and intersymbol and adjacent channel interference Intersymbol effects due to the bandlimiting IF filter are assumed to come only from immediately adjacent symbols. Similarly, it is assumed that only immediately adjacent channels contribute to interchannel interferences. Noise effects are handled by using a probability density formula for corrupted phase differences derived recently by R. F. Pawula 1981. An experimental system has been set up and error rates measured to verify the analytical results, which can be used to determine optimum receiver bandwidth and channel separation for quaternary DPSK systems.