Patent ID: 7065154

Claim:
A method for providing a first quadrature compensated data symbol (FQCDS), a second quadrature compensated data symbol (SQCDS), a first in-phase compensated data symbol (FICDS) and a second in-phase compensated data symbol (SICDS) to an inverse fast fourrier transform (IFFT) of a multicarrier quadrature modulator having an amplifier, wherein at least four transmitted symbols are available from the amplifier and at least four data symbols and a next data symbol are available from a mapper, comprising the steps of: a) calculating the energy of the at least four transmitted symbols; b) calculating an alpha, an epsilon and a gain based on the energy of the at least four transmitted symbols and the at least four data symbols, wherein the alpha, epsilon and gain are imbalance parameters; c) storing the alpha, epsilon and gain; d) first quadrature compensating the next data symbol of a first quadrature subcarrier based on the alpha, epsilon and gain to produce the FQCDS; e) second quadrature compensating the next data symbol of a second quadrature subcarrier based on the alpha, epsilon and gain to produce the SQCDS; f) first in-phase compensating the next data symbol of a first in-phase subcarrier based on the alpha, epsilon and gain to produce the FICDS; g) second in-phase compensating the next data symbol of a second in-phase subcarrier based on the alpha, epsilon and gain to produce the SICDS; h) repeating steps a, b and c wherein the at least four transmitted symbols include a next transmitted data symbol and the at least four data symbols include the next data symbol.