Excavating
Patent
1979-01-24
1980-11-18
Atkinson, Charles E.
Excavating
307358, 361 91, 375 99, H03K 1332, G06F 1100
Patent
active
042349540
ABSTRACT:
This on-line circuit estimates the bit error rate (BER) of a binary data signal stream in the presence of noise uncorrelated with the signal. For a binary data signal having two states, e.g., plus V and minus V biased around a specified reference level (REF), the circuit counts the number of instances in which the received signal deviates more than 2V from the reference level. This accumulated count gives an accurate estimate of the BER over several orders of magnitude variation of the BER. One embodiment counts just the deviations in a positive direction. This circuit functions independently of any bit pattern and can be used for on-line monitoring without decreasing the information carrying capability of the link. The time required to accumulate a statistically significant sample is the same as for a direct comparison between sent and received bits.
REFERENCES:
patent: 3204189 (1965-08-01), Trautwein
patent: 3214700 (1965-10-01), Hook
patent: 3248695 (1966-04-01), Dascotte
patent: 3721959 (1973-03-01), George
patent: 3757296 (1973-09-01), Gibson
patent: 3999083 (1976-12-01), Bumgardner
patent: 4034340 (1977-07-01), Sant'Agostino
patent: 4137556 (1979-01-01), Sessa
patent: 4156202 (1979-05-01), Takahashi
Lange Julius
Wagner Gary L.
Atkinson Charles E.
Ford Aerospace & Communications Corp.
Radlo Edward J.
Sadler Clifford L.
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