Fujitsu Corporation

Shigeru Ohkawa

Kiyotaka Takahashi

Takumi Takayashiki

Kouji Hirai

Takashi Yokoyama

A distortion compensating apparatus includes following units. An information measuring unit measures a distortion component and an electric power component based on a radiation signal. A compensation coefficient calculating unit calculates a compensation coefficient based on the distortion component and the electric power component. A signal transmitting unit outputs a signal corrected by the compensation coefficient as a transmission signal. A signal converting unit converts the transmission signal into a high frequency signal. An amplitude separating unit amplifies the high frequency signal and separates a portion thereof as a signal to be fed back. A feeding-back unit processes the portion and outputs the result as a feedback signal to the information measuring unit. An electric power information extracting unit outputs a portion of the high frequency signal as the radiation signal, extracts electric power information from the radiation signal, and directly outputs the electric power information to the information measuring unit.

Distortion compensating apparatus, wireless communicating apparatus, and distortion compensating method

In a multicarrier amplifying device, a power detecting section of a variable frequency type changes a detection frequency according to a carrier frequency, a power of which is to be measured, to detect a power level of each carrier, and a controlling section automatically adjusts the power level of the carrier on the basis of the detected power level. It is possible to automatically set a transmission power level of one carrier to a specified power level without stopping existing carriers.

Growing community of inventors

Kawasaki, Japan

Shigeru Ohkawa