Patent ID: 6603349
Filing Date: 2003-08-05
Classification: H03D,H04L

Abstract:
A demodulator which demodulates burst communications comprising:a phase angle source, coupled to a current received burst communication, which provides a phase angle of the current received burst communication; a comparator, coupled to the phase angle source and a source of an estimated phase angle, which provides an output signal representing an angular difference between a phase of the current received burst communication and the estimated phase angle; and a phase lock loop, coupled to the output signal, which provides the estimated phase angle including a phase accumulator which provides a first order component of compensation in the estimated phase angle; and wherein the phase lock loop includes a Doppler accumulator which provides a Doppler output which provides compensation in the estimated phase angle for the Doppler effect produced by relative motion between the demodulator and a source of the burst communications; and the Doppler accumulator provides a second order component of compensation in the estimated phase angle.