Distortion compensator and distortion compensation method

摘要

A distortion compensator compensates for distortion of a signal caused by an amplifier. A storage section stores a plurality of compensation coefficients used for distortion compensation. A selection section selects a compensation coefficient corresponding to an index value indicative of a power level of the signal from among the plurality of compensation coefficients. The selection section determines whether or not the power level is higher than a threshold, and uses, based on a determination result, a first index value calculated without using a logarithmic operation or a second index value calculated by using a logarithmic operation.

主权项

1. A distortion compensator for compensating for distortion of a signal caused by an amplifier, the distortion compensator comprising:
a storage section which stores a plurality of compensation coefficients used for distortion compensation, the plurality of compensation coefficients being identified by addresses; and a selection section which accesses, when a power level of the signal is in a first range of power levels, one of the plurality of compensation coefficients by using a first address converted from a first index value, and accesses, when the power level is in a second range of the power levels, one of the plurality of compensation coefficients by using a second address converted from a second index value, the first index value indicating the power level and being calculated without using a logarithmic operation, the second index value indicating the power level and being calculated by using the logarithmic operation.