Patent ID: 7035326

Claim:
A multi-tone modem with a plurality of components forming a transmit path and a receive path; and the receive path components of the multi-tone modem comprising: a fast Fourier transform (FFT) component to convert multiple received tones in a time domain to successive symbols in a frequency domain, with each of the successive symbols including pilot sub-symbols together with message sub-symbols; a message processor coupled to the FFT and the message processor operable to select pairs of message and pilot sub-symbols in each symbol and to equalize the message sub-symbol with the pilot sub-symbol in each pair of sub-symbols to substantially remove from the message sub-symbol frequency dependent phase shifts between the tones of each symbol; and the message processor including: a pseudo-equalizer for multiplying the message sub-symbol times the complex conjugate of the pilot sub-symbol in each pair of message and pilot sub-symbols to substantially remove from the message sub-symbol the frequency dependent phase shifts therein and; a decoder coupled to the message processor for decoding each message sub-symbol equalized in the act of equalizing to the corresponding message data.