Method and apparatus for DC restoration in digital receivers

Details Method and apparatus for DC restoration in digital receivers Method and apparatus for DC restoration in digital receivers

1988-10-20

1989-10-10

Griffin, Robert L.

Pulse or digital communications

Repeaters

Testing

307359, 341143, H04L 2506

Patent

active

048737020

ABSTRACT:
A technique for eliminating unwanted dc offset voltages in a receiver for decoding a plurality of multilevel digitally modulated signals. The data transmission system is arranged to send a particular preamble signal each time a different data source begins transmission of its data. The preamble signal produces at the receiver output multiple cycles of maximum level excursions. During the period of time that the preamble signal is received, a signal processor in the receiver determines an initial dc offset value by averaging the level of the received digitally modulated signal. After the transmission of the preamble, the signal processor continually generates updated dc offset voltages which are equal to the sum of the previously generated dc offset voltage and the difference between the amplitude level represented by the received digitally modulated signal and the amplitude level of the closest "coding" amplitude level; the difference being multiplied by a scaling factor. Once a scaling factor is applied to the updated dc offset value, the result is added to the previous dc offset voltage. And, the process is continually repeated to produce updated dc offset voltages.

REFERENCES:
patent: 3509279 (1970-04-01), Martin et al.
patent: 4186384 (1980-01-01), Acker
patent: 4602374 (1986-07-01), Nakamura et al.

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