Patent ID: 7711031

Claim:
A method of adaptively performing inter-carrier-interference (ICI) canceling in an Orthogonal Frequency-Division Multiplexing (OFDM) system, said method comprising: taking a Fast Fourier Transform (FFT) of a wireless electrical signal to produce an OFDM signal; estimating a DC component of a frequency-selective channel in said OFDM system; obtaining an initial estimate of data symbols associated with data bits of said OFDM signal; correcting said data bits with a Viterbi decoder; encoding the corrected data bits to acquire corrected data symbols; re-estimating said DC component of said frequency-selective channel using said corrected data symbols; filtering said corrected data symbols and sub-carrier of said frequency-selective channel; calculating a first order differential function of said frequency-selective channel based on successive ones of said corrected data symbols; removing an ICI component from the calculated first order differential function; and re-estimating said data symbols as a function of the removed ICI component.