Telecommunications – Carrier wave repeater or relay system – With frequency conversion
Patent
1977-09-06
1980-06-10
Griffin, Robert L.
Telecommunications
Carrier wave repeater or relay system
With frequency conversion
455 50, 455303, H04B 159
Patent
active
042075211
ABSTRACT:
A transmitter which transmits at least first and second burst sequences, through at least first and second channels of a radio link including a different repeater in each of the respective channels, is disclosed. A carrier signal is gated into each burst sequence in time division fashion by gating signals. By the use of gating signals reproduced from received bursts, a receiver detects an interference signal introduced from at least the first channel into the second by removing from the received bursts and interference signal that difference in frequency and/or phase which is liable to occur between the first and second bursts in the repeaters. To this end, continuous signals are controlled by the received bursts and the reproduced gating signals so as to have frequencies and phases different by the difference and are used to frequency convert the received first bursts and the received interference signal into a burst and an interference component signal. For an interference signal that occurs between the receiver and the repeaters nearest thereto, it is possible to produce the component signals by the use of the reproduced gating signals and an uncontrolled continuous signal. In both cases, a burst-mode or continuous-mode reference signal is used together with the gating signal reproduced from the received first bursts to make the component signals have the same frequency and phase as the reference signal and is used to determine correlation between the received first bursts and the received interference signal.
REFERENCES:
patent: 3735266 (1973-05-01), Amitzy
patent: 3986123 (1976-10-01), Tinno et al.
patent: 4090137 (1978-05-01), Soma et al.
Duvigon Peter
Griffin Robert L.
Nippon Electric Co. Ltd.
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