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Power line communications spread spectrum protocol

  • US 5,903,594 A
  • Filed: 04/16/1997
  • Issued: 05/11/1999
  • Est. Priority Date: 04/16/1997
  • Status: Expired due to Fees
First Claim
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1. A protocol implemented in a spread spectrum power line communications (PLC) system for a power line exhibiting a carrier synchronous noise spectrum, said communications system comprising a plurality of meters, each of said meters including a respective transmitter for transmitting message bits on a power line, and at least one receiver in a central hub coupled to the power line for receiving messages transmitted by the transmitters, said protocol comprising the steps of:

  • synthesizing at a transmitter a waveform si (t) having M tones described by ##EQU2## where i is one of a plurality of different signals which may be transmitted simultaneously, fik represents a selected frequency, t represents time, and aik and bik represent fixed amplitude coefficients for the i-th waveform;

    modulating at the transmitter the M tones with data;

    interstitially inserting the M tones in the power line synchronous noise spectrum so as to be effectively disjoint with the noise spectrum; and

    receiving the modulated M tones at the receiver, the transmission of data from the transmitters to the receiver being in a Master/Slave relation of meters to the receiver.

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