Patent ID: 7760810

Claim:
A receiver employing a digital wavelet multi-carrier demodulation for receiving data transmitted from a transmitter by Pulse Amplitude Modulation, said receiver comprising: a first wavelet transformer operable to perform a wavelet transform of received data; a second wavelet transformer operable to perform a wavelet transform of the received data, said second wavelet transformer being orthogonal to said first wavelet transformer; a complex data generator operable to generate complex data by defining outputs from said first wavelet transformer as in-phase components of complex information and outputs from said second wavelet transformer as orthogonal components of the complex information, and output the complex data; an equalizer operable to equalize the complex data, and output an equalized complex data; a clock-inconsistency compensator operable to select, based on a decision data which exists on the real axis on Cartesian coordinates, a single line among a plurality of predetermined lines, which are parallel to the imaginary axis on Cartesian coordinates, on which the equalized complex data would be distributed if the clock-inconsistency did not exist, replace an orthogonal component of the equalized complex data with a predetermined value, calculate an angle between the selected line and a line which passes through both the equalized complex data having the predetermined value as the orthogonal component and the decision data, perform compensation of a clock-inconsistency between said receiver and the transmitter by using the angle and obtain compensated complex data based on said compensation of said clock inconsistency; and said decision unit operable to decide whether the decision data used in communication corresponds to the compensated complex data in accordance with said Pulse Amplitude Modulation, and output the decision data.