System and method for low power clear channel assessment

Details System and method for low power clear channel assessment System and method for low power clear channel assessment

2008-04-15

2008-04-15

Fan, Chieh M. (Department: 2611)

Pulse or digital communications

Receivers

C375S338000, C375S329000, C375S235000, C375S147000, C375S150000, C375S142000, C375S343000, C455S343500, C455S574000, C455S067110

Reexamination Certificate

active

07359459

ABSTRACT:
A method is provided for performing a clear channel assessment in a local device. The local device receives signal energy in a wireless channel and splits the received signal energy into a real portion and an imaginary portion. It determines a real portion of a squared signal energy by subtracting a squared imaginary portion of the signal energy from a squared real portion of the signal energy, and determines an imaginary portion of the squared signal energy by calculating twice the product of the real and imaginary portions of the signal energy. It can perform a signal detection function on the real and imaginary portions of the squared signal energy to produce a clear channel assessment signal that indicates whether a set signal type is present in the wireless channel. This clear channel assessment signal can be used to determine whether the local device should remain in a low-power mode.

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