Signal compensation device and communication apparatus

A signal-compensation device includes a band-limitation unit that performs band limitation on a signal based on a variably adjusted band-set value and externally transmits the signal subjected to the band limitation to an amplifier, a measurement unit that measures a signal level of each of first and second signal components of a feedback signal which is part of an output of the amplifier fed back by a feedback unit to the band-limitation unit, where the each of first and second signal components is based on at least one of a property of variability of the band-set value, a feedback of the feedback signal by the feedback unit, and a nonlinear distortion of the amplifier, and an adjustment unit that adjusts the band-set value based on the signal level of each of the first and second signal components.