Patent ID: 7224666

Claim:
A method for using estimated carrier frequency offset (CFO) and sampled frequency offset (SFO) in an Orthogonal Frequency Division Multiplexing (OFDM) communications system having a plurality of pilot tones, comprising: measuring phases of each of the pilot tones for a number (n) of symbol times; for each of the pilot tones, estimating the slope of a phase angle change from symbol time to symbol time using a fit of the measured phases to a straight line; determining a best-fit straight line to find an estimated phase angle differential value (α(i)) for each pilot tone; wherein a slope of the best-fit straight line yields an estimate of the SFO, and an intercept with the best-fit straight line yields an estimate of the CFO; and compensating the estimated SFO and CFO at an OFDM receiver for effective communication in the OFDM communication system.