System for high speed digital transmission in repetitive noise e

Details System for high speed digital transmission in repetitive noise e System for high speed digital transmission in repetitive noise e

1987-08-17

1989-07-04

Orsino, Joseph A.

Communications: electrical

Systems

Selsyn type

371 64, H04M 1104

Patent

active

048454664

ABSTRACT:
A transceiver system for high speed, low bit-error rate data communications over a.c. power lines in the presence of repetitive impulse noise includes an a.c. power line coupling network, a power line communications modem, and a microprocessor with a memory and a programmed avoidance algorithm. The a.c. line coupling network includes a zero crossing circuit to detect the start of each a.c. cycle; a transient-voltage limiting front end to detect impluse noises above a threshold and minimize ringing, and a timing circuit to determine the time and duration of each impulse in each sampled a.c. cycle. The microprocessor records the start and stop times of impulses, repetitively scans several a.c. cycles and determines whether or not the impulses are periodic. For periodic impulses, the microprocessor blocks communication on the modem during the impulses, enabling the transceiver to transmit and receive between impulses.

REFERENCES:
patent: 4556864 (1985-12-01), Roy
patent: 4583232 (1986-04-01), Howell
Intrabuilding Data Transmission Using Power-Line Wiring, R. A. Piety; Hewlett-Packard Journal, May 1987.
Low Cost Modem IC Plugs into Power Lines, ignores Noise; Hariton et al; Electronic Design, 10/2/86.
NE5050 Power Line Modem, Specification, Signetics Corp., Sunnyvale, CA, 1987.

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