×

SYSTEM AND METHOD FOR DETECTING TEMPORARILY UNUSED BANDWIDTH IN THE RF SPECTRUM

  • US 20090268830A1
  • Filed: 05/17/2007
  • Published: 10/29/2009
  • Est. Priority Date: 05/18/2006
  • Status: Active Grant
First Claim
Patent Images

1. A method (200) of detecting temporarily available channels in a frequency band, comprising:

  • (a) selecting (205) a channel among a plurality of channels in a frequency band;

    (b) measuring (210) an energy received in the selected channel;

    (c) comparing (215) the measured energy received in the selected channel to a threshold established for the selected channel;

    (d) when the measured energy received in the selected channel exceeds the threshold established for the selected channel, determining (220) the selected channel is unavailable for transmission, otherwise determining (225) that the selected channel is available for transmission;

    (e) repeating steps (a) through (d) (205-225) for each of a plurality of channels in the frequency band (230);

    (f) selecting (250) one of the channels that was determined in step (d) to be unavailable;

    (g) correlating (255) a signal received in the selected unavailable channel with a known feature of a signal conforming to a particular transmission format;

    (h) comparing (260) the correlation result to a second threshold;

    (i) when the correlation result in the selected unavailable channel exceeds the second threshold, determining (265) that a signal conforming to the particular transmission format is present in the selected unavailable channel, otherwise determining (270) that the signal conforming to the particular transmission format is not present in the selected unavailable channel; and

    (j) repeating steps (f) through (i) (250-270) for each channel that was determined in step (d) (220) to be unavailable.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×