Patent ID: 7983233

Claim:
An apparatus for a receiver section with phase noise suppression in an OFDM based WLAN operating in accordance with IEEE standard 802.11a, comprising: an RF downconverter and analog-to-digital (A/D) that processes a received OFDM signal and outputs a downconverted digital OFDM signal; a phase shifter that multiplies the downconverted digital OFDM by a phase noise signal and outputs a baseband signal OFDM signal; a serial-to-parallel converter with the baseband OFDM signal as an input and parallel streams of the baseband OFDM signal as an output; an FFT that transforms the parallel streams of the baseband OFDM signal into a frequency domain signal R m (k); an ICI plus noise estimator with an input of a null subcarrier set S N extracted from the frequency domain signal R m (k) at the output of the FFT and an output comprising an estimate of a variance; a CPE estimator with an inputs of a pilot subcarrier set S p extracted from the frequency domain signal R m (k) at the output of the FFT and a decision feedback signal and an output of an estimate of phase error; and a MMSE Equalizer and Data Detector with inputs of S N , S P and a data sample set S D extracted from the frequency domain signal R m (k) at the output of the FFT, wherein a transmitted signal symbol decision, the phase noise signal and the decision feedback signal are outputs of the MMSE Equalizer and Data Detector, and wherein said estimates are used to calculate equalizer coefficients for N samples of each transmitted symbol of the baseband OFDM signal.