Fujitsu Corporation

Mitsuhiko Manpo

Takashi Tanii

Mitsunori Maeda

Kazushige Kishigami

Yuuji Osada

Kouji Hirai

Noriaki Shindo

Naohito Takayama

Hiroyuki Otsuki

To provide a radio apparatus including an amplifier, a first mixer, an analog-to-digital converter, a distortion compensator, and an oscillator. The amplifier amplifies power of a transmission signal. The mixer unit mixes a feedback signal from the amplifier with a local signal of a predetermined frequency. The analog-to-digital converter performs analog-to-digital conversion on an output signal of the mixer unit. The distortion compensator compensates nonlinear distortion of the amplifier based on a digital signal obtained by performing the analog-to-digital conversion. The oscillator changes a frequency of the local signal to be mixed with the feedback signal in the first mixer in a time division manner, with frequency spacing corresponding to a sampling rate of the analog-to-digital converter.

Radio apparatus

An antenna receives an RF signal and an RF signal at different frequency bands. An oscillator outputs a local oscillator signal at a frequency f. An oscillator outputs a local oscillator signal at a frequency f. A modulator modulates the frequency based on the local oscillator signal at the frequency fand the local oscillator signal at the frequency f, and generates a plurality of local oscillator signals at different frequencies. A frequency converter mixes the plurality of local oscillator signals, at different frequencies, generated by the modulator, with the RF signal and the RF signal, and generates baseband signals of the RF signal and the RF signal. A signal processor performs a predetermined process for the baseband signals generated by the frequency converter.

Wireless communication device and control method for wireless communication device

A transmission device, includes an amplifying unit which amplifies and outputs a modulation signal, a detecting unit which detects an output power of the amplifying unit, an output power changing unit which changes the output power of the amplifying unit based on an output of the detecting unit, and a control unit which controls an input impedance of the detecting unit based on each communication method.

Transmission device

Growing community of inventors

Sapporo, Japan

Mitsuhiko Manpo