05581229 is referenced by 152 patents and cites 53 patents.

The invention provides a layered modulation data communication systems characterized by numerous, asynchronous data transmitters operating on a power line. Data is modulated onto relatively low frequency subcarriers. Subcarriers are used to modulate carriers centered on a common frequency. The subcarriers are frequency division multiplexed. Data is recovered by demodulating the subcarriers from the carriers and subsequently demodulating the data from the subcarriers.

Title
Communication system for a power distribution line
Application Number
879204
Publication Number
5581229
Application Date
July 19, 1993
Publication Date
December 3, 1996
Inventor
Paul C Hunt
Brainerd
MN, US
Agent
Westman Champlin & Kelly P A
Assignee
Hunt Technologies
MN, US
IPC
H04M 11/04
View Original Source