Patent ID: 7310502
Filing Date: 2007-12-18
Classification: H04W

Abstract:
1. A transmission power control method for controlling the power to transmit to a distant party, comprising the steps of: controlling an adjustable digital-to-analog converter for generating an analog baseband signal to be input to a modulator for frequency-converting a transmission signal to a signal in an IF band; controlling first and second variable power amplifiers, connected in series with each other, for variably amplifying the transmission signal modulated by the modulator; a detection step of detecting a state of at least one of a local station and a distant station; and a modification step of modifying control ratios of the first and the second variable power amplifiers according to the detected state; wherein at least one of series and parallel control in a control range is made in the controlling the first and second variable power amplifiers step, and wherein, in the series control, the control ratio of the first variable amplifier is set to 1 and the control ratio of the second variable amplifier is set to 0, and wherein, in the parallel control, a sum of the control ratios of the first and second variable amplifiers is set to 1.