Communications: electrical – Systems – Selsyn type
Reexamination Certificate
1998-12-17
2001-06-19
Tong, Nina (Department: 2632)
Communications: electrical
Systems
Selsyn type
C340S315000
Reexamination Certificate
active
06249213
ABSTRACT:
FIELD OF THE INVENTION
The invention relates to the field of communication, and more particularly to the field of communication over alternating current power lines.
BACKGROUND OF THE INVENTION
Alternating current (AC) power lines have been used to create local area networks (LANs) in buildings without requiring additional wires. However, the AC power line environment includes high, unpredictable noise levels and highly variable signal attenuation characteristics with multiple frequency dependent impairments. These impairments change not only dwelling to dwelling, but also vary within the same dwelling as devices are plugged into the AC power line or turned on or off. Prior approaches to reducing the effects of these impairments include redundant carriers and spread spectrum techniques. A drawback of these approaches is that they do not fully utilize the available bandwidth. Therefore, a novel approach to transmitting information over AC power lines has been developed.
SUMMARY OF THE INVENTION
A method for transmitting information over an AC power line is disclosed. A frequency channel for transmitting the information is selected. The frequency channel is divided into a plurality of frequency orthogonal subchannels. The information is divided into a plurality of data subblocks. Each data subblock corresponds to one of the frequency orthogonal subchannels. The data of each data subblock is modulated for transmission through the corresponding frequency orthogonal subchannel.
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Intel Corporation
Seddon Kenneth
Tong Nina
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