Method, apparatus and computer program to efficiently...

Details Method, apparatus and computer program to efficiently... Method, apparatus and computer program to efficiently...

2008-03-11

2011-11-15

Payne, David (Department: 2611)

Pulse or digital communications

Spread spectrum

Frequency hopping

C375S344000

Reexamination Certificate

active

08059694

ABSTRACT:
Signal instances are detected from within a long period of a received radiofrequency RF signal envelope, grouped according to signal level, and periodicities are determined among the grouped signal instances. Periodicity of one of the groups is matched to a known periodicity, and a frequency domain is estimated at a time instance derived from the matched periodicity. If an expected frequency pattern is found that occupies the derived time instance in the estimated frequency domain, then a receiver is synchronized to a candidate signal that lies within the frequency pattern. Then content of the candidate signal is decoded and that content is used to access a cognitive radio system (e.g., register to the system, start the normal operation in the network such as spectrum detection and/or transmission in a traffic channel, etc.).

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Laskar, J., et al., “Reconfigurable RFICs and Modules for Cognitive Radio”, © 2006 IEEE, pp. 283-286.
Mohmaed Ghozzi et al., “Cognitive Radio: Methods for the Detection of Free Bands”, Comptes Rendus Physique, 2006, vol. 7, pp. 794-804, Elsevier, Paris, France.

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