Patent ID: 8831136
Filing Date: 2014-09-09
Classification: H03F,H04B

Abstract:
1. A wireless apparatus comprising: a plurality of amplifying systems each including: a switch that selects a plurality of feedback signals corresponding to the plurality of transmission signals output from the plurality of amplifying systems sequentially in a time-divisional manner; a subtractor that derives one or more differences between the feedback signal selected in the switch and the transmission signal, corresponding to the feedback signal, before the distortion compensation in the compensator; a first calculator that derives a distortion compensation coefficient that restricts the difference derived in the subtractor and updates the distortion compensation coefficient stored in the storing unit in the corresponding amplifying system by the derived distortion compensation coefficient; and a switch controller that controls the length of time during which each of the feedback signals is selected in the time-divisional manner in the switch depending on a magnitude of the distortion of each of the plurality of transmission signals output from the plurality of amplifying systems, the switch controller comparing the plurality of differences corresponding to the plurality of feedback signals derived in the subtractor with one another and causing the length of time during which the feedback signal is selected in the time-divisional manner to be longer for the feedback signal from the amplifying system having the larger difference.