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Automatic channel selection

  • US 4,197,500 A
  • Filed: 12/22/1978
  • Issued: 04/08/1980
  • Est. Priority Date: 11/01/1976
  • Status: Expired due to Term
First Claim
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1. In a communication system of a type that includes n channels each of which is subject to propagation anomalies and/or interference, said channels being arranged into m groups of p channels each, wherein n =m×

  • p, a method of selecting a channel for the transmission of a data signal between near and far ends of a communications link, said channel having characteristics which maximize the probability of successful transmission of data, comprising the steps of;

    (a) at the near end of said transmission system, continuously measuring the ambient energy levels of each of the p channels in the first one of said m groups to determine which of said p channels has the least ambient energy level;

    (b) re-iterating said measuring step for each of the remaining (m-1) groups;

    (c) selecting a given one of said channels with the least ambient energy levels as the most likely channel to maximize the probability of successful data transmission; and

    then(d) transmitting a test message to the far end of said system over said selected channel.

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