Patent ID: 8615048

Claim:
A method, comprising: providing an orthogonal frequency division multiplexing (OFDM) communication system for performing and supplying a channel estimation to a receiver; performing a first number of sampling points inverse fast Fourier transformation (IFFT) operation on a preliminary frequency-domain channel response which processes only partial frequency-domain channel responses from pilot sub-channels to generate a plurality of first time-domain channel impulse responses (CIRs), wherein the preliminary frequency-domain channel response has a second number of response values, and the second number is greater than the first number; performing a time-domain windowing operation on the plurality of the first time-domain CIRs, for filtering out sampling points of the plurality of the first time-domain CIRs not in a window having a length defined as a function of echo delay, and are lower than a weighted value of time-domain CIRs within the window, to generate a plurality of second time-domain CIRs, wherein said echo delay is associated with multi-path signals; performing a smoothing operation on the plurality of the second time-domain CIRs of successive time points to generate a smooth time-domain CIRs, wherein the smoothing operation is a weighted average operation; and performing a fast Fourier transformation (FFT) operation on the smooth time-domain CIRs to generate a second frequency-domain channel response.