High accuracy non data-aided frequency estimator for M-ary phase shift keying modulation

摘要

A method for non-data aided frequency offset determination for MPSK demodulation is accomplished by receiving a stream of K symbols and providing the symbol stream to a delay line of L symbols in length with L greater than 1. The symbol stream and an output of the delay line are then multiplied and the output of the multiplier is raised to the M power to remove modulation. The result is accumulated over K symbols and the argument of 1/K2πMLT times the accumulated result is determined as the frequency offset.