Patent ID: 8335282

Claim:
A method for implementing an orthogonal frequency division multiplexing (OFDM) baseband receiver, wherein the OFDM baseband receiver includes a channel estimation and tracking module for estimating a channel impulse response of an input signal of the equalizer, an equalizer, and a demapper, the method comprising: via the equalizer, multiplying the input signal and a conjugate of the channel impulse response to generate an output signal of the equalizer; via the demapper, deriving a plurality of adjusted decision boundaries from a plurality of decision boundaries in a constellation multiplied by a channel state information, and delimiting a plurality of amplitude-adjusted constellation points by the plurality of adjusted decision boundaries in the constellation, wherein the channel state information represents a square of an absolute value of the channel impulse response; via the demapper, calculating a plurality of soft decision values according to the plurality of adjusted decision boundaries and the output signal of the equalizer; and via the demapper, finding a first constellation point which is the most approximate to the output signal of the equalizer from the plurality of amplitude-adjusted constellation points in the constellation according to the signs of soft decision values, and demodulating the output signal of the equalizer.