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Systems and methods for beaconing in wireless networks with low probability of detection

  • US 7,269,198 B1
  • Filed: 11/19/2001
  • Issued: 09/11/2007
  • Est. Priority Date: 11/19/2001
  • Status: Expired due to Fees
First Claim
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1. In a wireless network including a plurality of nodes, a method of performing neighbor discovery, the method comprising:

  • generating a signal at a first node for alerting other nodes in the network of the presence of the first node, the signal comprising a spread signal;

    broadcasting the signal from the first node, the broadcasted signal having a low probability of detection by an unintended receiver,receiving the signal at a second node;

    filtering the received signal at the second node using a filter matched to a spreading sequence or code used to spread the signal;

    calculating an energy associated with the filtered signal;

    establishing a threshold;

    determining whether the energy is greater than the threshold;

    identifying, by the second node, the first node as a neighbor node when the energy is greater than the threshold;

    transmitting a message from the second node to the first node, the message comprising information identifying the second node;

    repeating the broadcasting of the signal from the first node;

    adjusting a power level associated with broadcasting the signal based on whether the message from the second node has been received by the first node; and

    changing, by the first node, the spreading sequence or code used to spread the signal after a number of broadcasts.

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