Method and means of preventing oscillations in a same-frequency

Details Method and means of preventing oscillations in a same-frequency Method and means of preventing oscillations in a same-frequency

1981-07-02

1983-05-10

Ng, Jin F.

Telecommunications

Carrier wave repeater or relay system

Transmitter/receiver feedback compensation

455 22, H04B 714

Patent

active

043833314

ABSTRACT:
A same-frequency repeater used in a system that has at least one other same-frequency repeater is protected against oscillation resulting from feedback of signals broadcast by the same-frequency repeater, either directly or after reception and rebroadcast by another same-frequency repeater. A tag is added to the signal to be broadcast from the first SFR, and one tag detection and canceling system is added to the first SFR for each SFR, in the system. Each tag detector senses the presence of tagged signal received by the first SFR and adjusts amplitude and phase of an appropriately delayed signal that is fed back to cancel the signal containing tag.

REFERENCES:
patent: 3696429 (1972-10-01), Tressa
patent: 4317217 (1982-02-01), Davidson et al.

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