Patent ID: 7907589
Filing Date: 2011-03-15
Classification: H03G,H04W

Abstract:
1. A direct conversion reception apparatus for use in a system where transmit power varies between transmission signals by downlink transmit power control, the apparatus comprising: a reception quality measurement section that measures reception quality of a first signal of an earlier received frame that is comprised of a plurality of time slots, the reception quality being measured on a per time slot basis; a gain estimation section that estimates gains for amplifying a second signal of a later received frame, the gains being estimated on a per time slot basis, before a reception period of the later received frame, based on the reception quality of individual time slots measured by the reception quality measurement section, and the second signal being amplified to a predetermined reference value; a gain control section that selects, on a per frame basis, a maximum gain, from the gains of individual time slots estimated by the gain estimation section, and performs gain control, on a per time slot basis, during the reception period of the later received frame; and a voltage calibration section that calibrates an offset voltage of the second signal of the later received frame, on a per frame basis, before the reception period of the later received frame, using a calibration value matching the maximum gain selected by the gain control section.