Apparatus useful in channel equalization adjustment

Details Apparatus useful in channel equalization adjustment Apparatus useful in channel equalization adjustment

1986-04-25

1987-09-15

Levy, Stewart J.

Pulse or digital communications

Repeaters

Testing

375101, 324 77R, H04B 1700

Patent

active

046944680

ABSTRACT:
In equalizing a digital channel, impulses are applied to the channel input at the Nyquist rate. The channel response is sampled to determine its amplitude values of specified sampling times, and the amplitude values are converted into corresponding pulse duration signals. The pulse duration signals are applied to a time interval analyzer whereby the signal input durations are displayed in the form of a histogram showing the number of pulses of a given duration as a function of pulse duration. The time dispersion of the displayed pulse durations measures the intersymbol interference present, and is a measure of the quality of the equalization.

REFERENCES:
patent: 3506918 (1970-04-01), Perrault
patent: 4321636 (1982-03-01), Lenz
patent: 4376309 (1983-03-01), Fenderson et al.
patent: 4449223 (1984-05-01), Liskov et al.
patent: 4475210 (1984-10-01), Couch
"Digital Communications", Feher, Prentice Hall, 1981, pp. 232, 235-236.

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