Patent ID: 8000417

Claim:
An OFDM (orthogonal frequency-division multiplexing) receiver circuit comprising: a GI (Guard Interval) combiner circuit configured to combine a signal including at least a portion of a GI included in an OFDM received signal and a signal of a duplicate section of the OFDM received signal corresponding to the portion of the GI to provide a combined signal; a channel parameter estimator circuit configured to estimate a channel parameter value based on channel delay information; an FFT (Fast Fourier Transform) circuit configured to receive the combined signal output from the GI combiner circuit and configured to convert the combined signal to a frequency domain to provide a converted signal; and an equalizer circuit configured to equalize the converted signal output from the FFT circuit based on the channel parameter value output from the channel parameter estimator circuit, wherein the channel parameter estimator circuit estimates the channel parameter value according to: ξ q = 1 + ⅇ - j ⁢ 2 ⁢ π ⁢ ⁢ qN GI ′ N 2 ⁡ [ ⅇ j ⁢ 2 ⁢ π ⁢ ⁢ q N - 1 ] where N′ GI is the length of a section corresponding to the at least a portion of the signal of the GI, q is greater than or equal to 1 and N is a length of the FFT.