A new baseband signal processing method for compensating
frequency shift in DPSK systems is introduced.
This method consists of a signal processor for
initial aquisition of frequency shift and a simple adaptive
equalizer for tracking. The former is based on the
observation that the eSfect of frequency shift can be eliminated
by using boundary values of the received baseband
signal between symbol periods. The latter is a single
tap equalizer employing least mean square (LMS) adaptation
algorithm. Computer simulation results demonstrate
that the proposed frequency shift compensation
technique outperforms existing methods and works well
for a wide range of frequency shifts.
DPSK; adaptive equalizer; least mean square (LMS)
Proceedings of the 1996 15th Annual Military Communications Conference, MILCOM 96. Part 3 (of 3) v.3 no. pp.1059 - 1063