Power line communications spread spectrum protocol
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United States of America Patent
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May 11, 1999
Grant Date -
N/A
app pub date -
Apr 16, 1997
filing date -
Apr 16, 1997
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A spread spectrum protocol in a power line communication (PLC) system uses Harmonic Modulation (HM) as true spread spectrum modulation made up of a plurality of modulated tones spaced in frequency with equal distance between adjacent tones. The protocol incorporates the following modes: 'Conventional'--Master/Slave relation of meters to a common hub. 'Leap Frog'--performing data relay through locally elected/designated meters for relay to a central hub or a distributed set of concentrators. 'Alarm Channel'--reserving an HM signal set for meters to telemeter their configuration in a subnetwork after a power distribution network reconfiguration. 'Probing'--using HM polling to diagnose the location of a feeder fault. 'Derived Timing'--master derived timing for inbound message framing. 'Rate Adapting'--allocating a mix of number of HM channels to the outbound/inbound ratio according to message traffic control requirements and power line distribution topology. 'Priority/Noise Based Adapting'--allocating a different mix of number of HM channels to the outbound/inbound ratio based on message priority or noise conditions.
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