Patent ID: 7970070

Claim:
A method for performing adaptive frequency domain equalization in an Orthogonal Frequency Domain Multiplexing (OFDM) based communication system that transmits data information, said method comprising: receiving OFDM symbols comprising scattered pilots; obtaining channel estimates on every third bin of said scattered pilots in a frequency domain, wherein said channel estimates are obtained by performing an interpolation in a time domain across the received OFDM symbols; estimating an original channel based on said channel estimates, wherein said original channel in said time domain is estimated by applying a finite impulse response (FIR) low-pass filter in a frequency domain, wherein said FIR low-pass filter is adaptive according to a delay span of an original channel impulse response and is sufficiently wide to cover said delay span of said original channel impulse response to achieve a maximum noise reduction in said OFDM based communication system, wherein said maximum noise reduction in said OFDM based communication system approximately equals 1 dB for a Typical Urban Six (TU6) channel; and dividing said received OFDM symbols by said channel estimate to obtain transmitted data information.