Method for making a clear channel assessment in a wireless...

Details Method for making a clear channel assessment in a wireless... Method for making a clear channel assessment in a wireless...

2007-10-09

2007-10-09

Payne, David C. (Department: 2611)

Pulse or digital communications

Receivers

C375S130000, C375S150000, C375S239000, C375S343000, C375S354000

Reexamination Certificate

active

10677753

ABSTRACT:
A method is provided for performing a clear channel assessment in a wireless network. The method involves first listening for channel energy on a wireless channel. Whatever channel energy is heard over the wireless channel is demodulated into non-synchronized in-phase and non-synchronized quadrature phase components. Each of the non-synchronized in-phase and non-synchronized quadrature phase components are squared, and then the non-synchronized in-phase component is multiplied by the non-synchronized quadrature phase component to produce an I−Q product. The sum of the squared non-synchronized in-phase component, the inverse of the squared non-synchronized quadrature component, and double the I−Q product is determined as a clear channel assessment input value. A carrier signal detection function is then performed on the clear channel assessment input value to produce a clear channel assessment output value, which is used to determine whether a signal is present in the wireless channel.

REFERENCES:
patent: 4628270 (1986-12-01), Roberts
patent: 5121071 (1992-06-01), Kelly et al.
patent: 2003/0210169 (2003-11-01), Steele et al.
Bernard Sklar, Digital Communications Fundamentals and Applications, 1988, pp. 444-445, 447, and 454, PTR Prentice Hall, New Jersey.
Floyd M. Gardner, Phaselock Techniques, 1979, pp. 271-273, John Wiley & Sons, New York, Chichester, Brisbane, Toronto.

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