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Automatic resynchronization technique

  • US 4,807,248 A
  • Filed: 05/23/1984
  • Issued: 02/21/1989
  • Est. Priority Date: 05/23/1984
  • Status: Expired due to Term
First Claim
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1. A data transmission technique comprising:

  • (a) providing a transmitter capable of transmitting information in a series of different and pseudoramdomly selected frequencies;

    (b) providing a receiver capable of receiving information in a series of different and pseudoramdomly selected frequencies;

    (c) generating a plurality of synchronization frames and resynchronization frames, for allowing the receiver to frequency synchronize with the transmitter, wherein the information necessary to acquire synchronization is divided among at least two of said synchronization or resynchronization frames with each frame transmitted on a different frequency, said at least two synchronization or resynchronization frames comprising a plurality of identically formatted and timed synchronization frames and a start of message frame;

    (d) generating a plurality of message frames including information defining a message to be transmitted and (e) transmitting said plurality of identically formatted and timed synchronization frames and said start of message frames such that said plurality of identically formatted and timed synchronization frames are transmitted prior to the transmission of said start of message frame, each frame is transmitted on a different pseudoramdomly selected frequency and said plurality of resynchronization frames are separated by message frames.

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