Digital Implementation of a Duobinary Signalled MSK Demodulator

Abstract

This paper presents a digital implementation of a demodulator for duobinary signalled Minimum Shift Keying (MSK). A duobinary signalled MSK signal was used because of the desirable spectral properties of MSK as well as the attractive bandwidth efficiency of duobinary signalling. The demodulator was subjected to various simulation tests to affirm its robustness under practical conditions. It was observed to display good tolerance to phase perturbations and frequency deviations. Its frequency tracking ability was good and comparable to its analog counterpart. Thus it will be of advantage to employ this demodulator as opposed to its analog counterpart. It is cheaper and easier to implement.

UNISWA Research Journal of Agriculture, Science and Technology Vol. 4 (2) 2000: pp 147-154