CARRIER STABILITY ERASURE FILLING SYSTEM FOR COMMUNICATIONS OVER ELECTRICITY DISTRIBUTION NETWORK

摘要

A communication system uses the current waveform of anelectricity distribution network as a carrier, the signal beingpresent as current pulses around four predetermined zerocrossings. The current waveform is sampled around the voltagezero crossings to obtain a time-ordered set of waveform values.The ordered waveform values for each bit are examined todetermine if the values fall within preset criteria indicative ofa stable carrier. When the ordered waveform values for aparticular bit all fall within the preset criteria, thatparticular bit is identified as a good bit. When at least someof the ordered waveform values for a particular bit fall outsidethe preset criteria, that particular bit is labelled as suspect.The ordered values of each suspect bit and of adjacent bits aretested to determine whether four successive values meet thepreset stability criteria, and whether the four successive valuesindicating a stable carrier include at least two successivevalues from the suspect bit. If the carrier stability test ispassed, the binary value of the suspect bit is based upon thesuccessive carrier stability indicating values from the suspectbit. Otherwise the suspect bit is labelled as uncorrectable.