US 5,815,795 A · Oscillation detecting system for wireless repeater

Abstract

An oscillation detecting apparatus for detecting an oscillation of a wireless repeater intervening between a base station and a mobile station brought in communication with each other through a TDMA system. The wireless repeater produces an input signal based on a radio wave transmitted from one of the base station and the mobile stations, and amplifies the input signal to produce an output signal. The output signal is transmitted from the wireless repeater to the other of the base station and the mobile station. The oscillation detecting apparatus comprises producing apparatus for producing a power level signal varied in proportion with an amplitude of the output signal. The power level signal is formed by, for example, an envelope of the output signal. The oscillation detecting apparatus further comprises first detecting apparatus for detecting a direct current component included in the power level signal, and second detecting apparatus for detecting an alternating current component included in the power level signal. The oscillation detecting apparatus further comprises first judging apparatus for judging whether the direct current component of the power level signal has reached a predetermined upper-limiting level, and second judging apparatus for judging whether the alternating current component of the power level signal is smaller than a predetermined criterion level. The oscillation detecting apparatus includes deciding apparatus for deciding that the wireless repeater is oscillating when both judgments are affirmative, thereby making it possible to enhance the accuracy of the oscillation detection.

Claims18

Dependent claims

An oscillation detecting apparatus for detecting an oscillation of a wireless repeater intervening between a base station and a mobile station brought in communication with each other through a time division multiple access system, said wireless repeater being operated to produce an input signal based on a radio wave transmitted from one of said base station and said mobile station, and amplify said input signal to produce an output signal, said wireless repeater being further operated to transmit said output signal in the form of a radio wave to the other of said base station and said mobile station, and said oscillation detecting apparatus comprising:

producing means for producing a power level signal varied in proportion with an amplitude of said output signal;
first detecting means for detecting a direct current component included in said power level signal;
second detecting means for detecting an alternating current component included in said power level signal;
first judging means for judging whether said direct current component of said power level signal has reached a predetermined upper-limiting level or not;
second judging means for judging whether said alternating current component of said power level signal is smaller than a predetermined criterion level or not;
and
deciding means for deciding that said wireless repeater is oscillating when said first judging means judges that said direct current component of said power level signal has reached said predetermined upper-limiting level, and when said second judging means judges that said alternating current component of said power level signal is smaller than said predetermined criterion level.

4 more elements

A wireless repeater intervening between a base station and a mobile station brought in communication with each other through a time division multiple access system, comprising:

receiving means for receiving a radio wave transmitted from one of said base station and said mobile station and producing an input signal based on the received radio wave;
amplifying means for amplifying said input signal to produce an output signal;
transmitting means for reproducing a radio wave on the basis of said output signal and transmitting the reproduced radio wave to the other of said base station and said mobile station;
producing means for producing a power level signal varied in proportion with an amplitude of said output signal;
first detecting means for detecting a direct current component included in said power level signal;
second detecting means for detecting an alternating current component included in said power level signal;
first judging means for judging whether said direct current component of said power level signal has reached a predetermined upper-limiting level or not;
second judging means for judging whether said alternating current component of said power level signal is smaller than a predetermined criterion level or not;
and
deciding means for deciding that said wireless repeater is oscillating when said first judging means judges that said direct current component of said power level signal has reached said predetermined upper-limiting level, and when said second judging means judges that said alternating current component of said power level signal is smaller than said predetermined criterion level.

7 more elements

Dependencies are inferred from the claim text.

Oscillation detecting system for wireless repeater

Life of this patent

Oscillation detecting system for wireless repeater

Life of this patent

Abstract

Claims18