One frequency repeater for a digital microwave radio system with

Details One frequency repeater for a digital microwave radio system with One frequency repeater for a digital microwave radio system with

1986-01-09

1987-10-20

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

178 70S, 178 71R, 455 16, 455 21, 455 24, H04B 715

Patent

active

047019352

ABSTRACT:
A digital microwave radio repeater using the same carrier frequency for the transmitter and the receiver carriers for improving the frequency utilization efficiency. The transmitter-to-receiver interference signal is cancelled by producing an estimated-interference signal of the interference signal from the digital baseband signal by the use of a transversal filter and by subtracting the estimated-interference signal from the received signal. The estimated-interference signal is also produced by frequency shifting a digital modulated signal in the transmitter. The transmitter carrier frequency is locked to the receiver carrier frequency by the use of a phase-locking technique, so that the interference signal is reduced.

REFERENCES:
patent: 2425315 (1947-08-01), Atwood et al.
patent: 2704362 (1955-03-01), Bergan
patent: 4107609 (1978-08-01), Gruenberg
patent: 4302842 (1981-11-01), Huriau
patent: 4475243 (1984-10-01), Bativala et al.
patent: 4475246 (1984-10-01), Bativala et al.

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