Ntt Docomo, Inc.

Noriyoshi Terada

Toshio Nojima

Atsushi Fukuda

Yoshiaki Tarusawa

Ryo Yamaguchi

Shoichi Narahashi

Yasunori Suzuki

Kei Satoh

Ning Chen

A radio communication terminal disposed in close proximity to or built in electronic equipment is provided with a receiver connected to a receiving antenna and an interference canceller for removing from a received signal a radiated noise component from the electronic equipment received by the receiving antenna. The interference canceller includes a radiated noise predictor which predicts the radiated noise component in the received signal based on the radiated noise from the electronic equipment and generates a pseudo interference signal accordingly, and an adder which cancels the radiated noise component in the received signal by the pseudo interference signal.

Radio communication terminal

The invention relates to a high sensitivity receiver installed outdoors which may be used in a base station of a mobile communication system, for example. A received radio frequency signal is converted into a signal in a desired frequency band by a reception bandpass filter RXF, is subject to a low noise amplification to a desired level by a low noise reception amplifier LNA, and the amplified signal is converted into an optical signal by a laser diode LD. RXF, LNAand LDare confined in a heat shielding box. LDis cooled by cooling means to the order of critical temperature where RXF, for example, assumes a superconducting state, whereby the dynamic range is increased and stabilized.

High sensitivity radio receiver

Different carrier frequencies are chosen for plural transmitters of a transmitting device and signals are transmitted at frequency bands overlapping each other. In the receiving device weighting coefficients are provided in input-to-output paths of an interchannel interference cancellerso that the cross correlation between output signals from the interchannel interference canceller is minimized.

Radio communication method and apparatus for multiplex transmission of plural signals in the same frequency band

To provide a super directional gain in a multi-element array antenna. An array antenna comprising a plurality of antenna elements A-&#x2013;A-spaced at intervals (equal to or less than a quarter of a wavelength) that provides a supergain is used. A weight generator circuit generates weight data in accordance with phase difference and amplitude difference among the antenna elements A-&#x2013;A-and directivity data of each of the antenna elements A-&#x2013;A-The generated weight data is used to weight each of the antenna elements A-&#x2013;A-

Supergain array antenna system and method for controlling supergain array antenna

A system for measuring the position of an in vivo radio device is disclosed. The system comprises the in vivo radio device administered into a living organism, a plurality of ex vivo radio devices disposed outside of the living organism, and a position measuring device. The in vivo radio device includes a transmitter for transmitting a vital information signal or a position measuring signal. Each of the ex vivo radio devices includes a receiver for receiving the vital information signal or the position measuring signal. The position measuring device includes a position measuring unit for measuring the position of the in vivo radio device based on receiving characteristics of the vital information signal or the position measuring signal received by the ex vivo radio devices.

Method and system for measuring a position, position measuring device, and an in vivo radio device

A mobile communication base station determines the oncoming direction of a radio wave with a simple arrangement and transmits a narrow angle beam in this direction. Received signals from a pair of wide angle beam antennae-and-having an equal configuration and a common orientation and which are located close to each other are fed to a direction finder receiverand a communication receiver. By utilizing the fact that the both received signals have a coincident amplitude, a phase difference between the received signals is detected. The oncoming direction of the received radio wave (or the direction of a mobile station) is determined on the basis of the phase difference. A beam switcheris controlled so as to connect a transmitterto a narrow angle beam antenna (one of-to-) which is directed in the oncoming direction thus determined.

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Yokosuka, Japan

Noriyoshi Terada