Noise detection by sampling digital baseband signal at eye openi

Details Noise detection by sampling digital baseband signal at eye openi Noise detection by sampling digital baseband signal at eye openi

1987-03-05

1989-03-07

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

375 97, 455296, H04B 112, H03K 508

Patent

active

048101010

ABSTRACT:
A noise detection circuit for a digital radio receiver comprises a sampling circuit for sampling a digital baseband signal having a noise component when an eye opening of the baseband signal is largest. A waveform generator is connected to the output of the sampling circuit for generating a waveform which is a replica of the baseband signal and free from the noise component. The waveform generator comprises a threshold comparator having decision thresholds and a waveform recovery circuit which includes a resistor, a plurality of storage capacitors of equal values and a switch responsive to the output of the threshold comparator for selectively coupling the output of the sampling circuit through the resistor to the storage capacitors. A substractor is connected to the outputs of the sampling circuit and the waveform generator for generating a signal representative of the noise component of the baseband signal. The output of the subtractor circuit can be used for various purposes including noise measurement, squelch action and automatic local oscillator frequency control.

REFERENCES:
patent: 3697875 (1972-10-01), Guanella
patent: 4071827 (1978-01-01), Koike et al.
patent: 4416017 (1983-11-01), Jasper et al.

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