×

Power-line digital communication system

  • US 6,608,552 B1
  • Filed: 05/23/2001
  • Issued: 08/19/2003
  • Est. Priority Date: 11/24/1998
  • Status: Expired due to Fees
First Claim
Patent Images

1. A method for transmitting data over power lines, the data being represented by a series of symbols, each symbol having one of a finite number of possible values, the method comprising:

  • encoding the series of symbols into a corresponding sequence of groups, each group consisting of N successive bursts of alternating signal, whereby each burst is assigned one of M possible frequencies; and

    decoding a group of said successive bursts, upon reception, whereby the decoding includes;

    providing M reference signals, each having a unique one of said M frequencies, and correlating each of said bursts with said M reference signals, resulting in M correlation values for each burst, for each possible symbol value, selecting for each burst the correlation value that corresponds to the frequency assigned to that symbol value and adding all selected correlation values together, to yield a symbol score, and selecting the highest symbol score to indicate the decoded symbol value;

    whereby said correlation, with respect to each of said M reference signals, includes;

    providing the reference signal as a binary values reference signal;

    converting the received signal into a binary valued received signal;

    performning a XOR operation between the binary valued reference signal and the binary received signal;

    providing a continuous train of clock pulses; and

    counting said clock pulses up or down according to the results of said XOR operation.

View all claims
  • 2 Assignments
Timeline View
Assignment View
    ×
    ×