Patent ID: 7079610

Claim:
A receiver, for use in an Orthogonal Frequency Division Multiplexing (OFDM) transmission system, comprising an adaptive channel equalizer means, detector means, equalization parameter updating means, a sampling clock and a sampling clock control means, the equalization parameter updating means responding to outputs of the detector means and the adaptive channel equalizer means to provide an equalizer parameter to the adaptive channel equalizer means, the equalization parameter updating means including an ambiguity prevention mechanism to prevent said adaptive channel equalizer means from operating on time differences between the receiver and a transmitter which should be corrected by operation of said sampling clock control means, the equalizer parameter having an equalizer parameter argument function and said adaptive channel equalizer means being prevented from operating on said time differences by forcing a slope of a linear part of the equalizer parameter argument function to be always zero, said sampling clock having a sampling clock frequency, said adaptive channel equalizer means providing an equalizer output vector U, and said detector means providing a quantized vector Y, said sampling clock frequency being controlled by a feed-back signal generated from an estimated slope of an argument function, Y*.U which is the element-by-element product of the equalizer output vector U and the conjugate of the quantized vector Y.