Carrier-to-noise detector for digital transmission systems

Details Carrier-to-noise detector for digital transmission systems Carrier-to-noise detector for digital transmission systems

1988-06-23

1989-05-30

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

375 97, 455226, H04B 110

Patent

active

048357901

ABSTRACT:
A carrier-to-noise detector comprises an A/D converter (1) which samples an output of the demodulator of a digital transmission system at a symbol clock rate and converting it to a digital signal having positive and negative values. An absolute value converting circuit (2) converts the output of A/D converter into an absolute value which is averaged by a first averaging circuit (3) over a period sufficient to suppress short term variations and then squared by a first squaring circuit (4) to give an output representing the carrier component. The output of A/D converter is, on the other hand, squared by a second squaring circuit (5) and averaged by a second averaging circuit (6) to suppress short term variations to give an output representing a total of the carrier and noise components. The carrier component in the output of the second averaging circuit 6 is subtracted by a subtractor (7). A ratio between the outputs of the first squaring circuit (4) and subtracting circuit (7) is derived by a divider (8) as a representation of a carrier-to-noise ratio.

REFERENCES:
patent: 3238457 (1966-03-01), Boymel et al.
patent: 3302116 (1967-01-01), Free
patent: 3350643 (1967-10-01), Webb
patent: 4253189 (1981-02-01), Lemoussu et al.
patent: 4466108 (1984-08-01), Rhodes

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