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Methods and apparatuses for self-generating fault-tolerant keys in spread-spectrum systems

United States Patent

December 15, 2015
View the Complete Patent at the US Patent & Trademark Office
Idaho National Laboratory - Visit the Technology Transfer and Commercialization Office Website
Self-generating fault-tolerant keys for use in spread-spectrum systems are disclosed. At a communication device, beacon signals are received from another communication device and impulse responses are determined from the beacon signals. The impulse responses are circularly shifted to place a largest sample at a predefined position. The impulse responses are converted to a set of frequency responses in a frequency domain. The frequency responses are shuffled with a predetermined shuffle scheme to develop a set of shuffled frequency responses. A set of phase differences is determined as a difference between an angle of the frequency response and an angle of the shuffled frequency response at each element of the corresponding sets. Each phase difference is quantized to develop a set of secret-key quantized phases and a set of spreading codes is developed wherein each spreading code includes a corresponding phase of the set of secret-key quantized phases.
Moradi; Hussein (Idaho Falls, ID), Farhang; Behrouz (Salt Lake City, UT), Subramanian; Vijayarangam (Naperville, IL)
Battelle Energy Alliance, LLC (Idaho Falls, ID)
14/ 163,723
January 24, 2014
GOVERNMENT RIGHTS This invention was made with government support under Contract Number DE-AC07-051D14517 awarded by the United States Department of Energy. The government has certain rights in the invention.