Experientially determined signal quality measurement device for

Details Experientially determined signal quality measurement device for Experientially determined signal quality measurement device for

1981-03-11

1983-06-07

Atkinson, Charles E.

Excavating

371 22, 371 64, 375 10, G06F 1100, H04L 100

Patent

active

043874614

ABSTRACT:
In a data link conveying antipodal (two level) data bits, a signal quality measuring circuit using prestored experiential data acquired during a calibration phase. Any signal quality parameter, such as BER and E.sub.b /N.sub.o, can be measured by the circuit. The number of events falling within an error gate is compared with a more universal measure of bit events occurring during the sampling interval. These values are translated into a quantitative measure of signal quality by means of a prestored lookup table. The error gates can be shaped to represent phase deviations, amplitude deviations, or any combination of phase and amplitude deviations. A wide dynamic range can be achieved by using several different gates of various shapes. The gates are derived from a bit synchronizer; the circuit functions without the necessity for superimposing upon the data stream any coding information as is common with BER measurement devices of the prior art.

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