Telecommunications – Carrier wave repeater or relay system – Monitoring
Patent
1996-07-25
1998-09-29
Crosland, Donnie L.
Telecommunications
Carrier wave repeater or relay system
Monitoring
455 7, 455 10, 455 111, 455 134, 455 18, 370318, H04B 160
Patent
active
058157956
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.
REFERENCES:
patent: 4083004 (1978-04-01), Cohn
patent: 4713809 (1987-12-01), Mizota
patent: 5060292 (1991-10-01), Ayukawa et al.
patent: 5200955 (1993-04-01), McFarlane et al.
Crosland Donnie L.
Sumitomo Electric Industries Ltd.
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