Patent ID: 7567640

Claim:
A phase offset tracking method for tracking a phase offset in an Orthogonal Frequency Division Multiplexing (OFDM) receiver, said OFDM receiver receiving various kinds of input symbols and compensating a phase offset in each symbol, each input symbol comprises an input phase offset, said phase offset tracking method comprising: receiving an input symbol; generating an frequency-domain symbol according to the input symbol; generating an estimated error phase according to the frequency-domain symbol; utilizing a first and a second registers to respectively store a first and a second register values; setting the first and second register values initially according to the estimated error phase; filtering the estimated error phase to generate a filtered signal according to the first register value; and accumulating the filtered signal continuously according to the second register value to generate an output phase for compensating an input phase offset in each input symbol; wherein the step of setting the second register value further comprises: setting the second register value to be twice of the unit phase error initially to compensate the phase offset in a second coming input symbol after a first coming input symbol is processed.