Patent ID: 8077780

Claim:
A method for improving a multi-carrier system, comprising the steps of: (A) transmitting, through a communications channel, a plurality of multi-carrier signals on a plurality of frequencies, with the plurality of multi-carrier signals including a subset of unmodulated carrier signals, respectively; (B) receiving the plurality of multi-carrier signals; (C) measuring in-phase and quadrature amplitudes or powers, for each received unmodulated carrier signal of the subset of the unmodulated carrier signals; (D) comparing the measured in-phase and quadrature amplitudes or powers of each received unmodulated carrier signal of the subset of unmodulated carrier signals to predetermined criteria; (E) generating adjusting data from the compared in-phase and quadrature amplitudes or powers including the step of generating pre-distorting data including from any of power level, spectral shape, and phase characteristics; (F) adjusting, using the adjusting data, the in-phase and quadrature amplitudes or powers for a next plurality of multi-carrier signals to be transmitted, thereby generating a plurality of adjusted multi-carrier signals; and (G) transmitting, with the in-phase and quadrature amplitudes or powers adjusted per the adjusting data, the next plurality of multi-carrier signals through the communications channel.