Patent ID: 8059753

Claim:
An adaptive channel estimator for estimating channel frequency responses when receiving OFDM symbols, comprising: a channel estimator generating a first channel frequency response for each one of a plurality of first OFDM symbols when operated in a first mode wherein the first OFDM symbols are continuous in time axis, and generating a second channel frequency response for each one of a plurality of second OFDM symbols when operated in a second mode, wherein each one of the second OFDM symbols is separated from the other one of the second OFDM symbols by Mâˆ’1 non-second symbols in time axis and M is a constant integer exceeding one; and a channel tracking module indicating a channel status, and controlling the channel estimator to selectively operate in the first mode or the second mode according to the channel status, wherein the channel status is obtained by the channel tracking module, which monitors a function of time variation of the channel.