Angle-modulated signal threshold extension device and method

Details Angle-modulated signal threshold extension device and method Angle-modulated signal threshold extension device and method

2008-10-20

2011-12-06

Fan, Chieh M. (Department: 2611)

Pulse or digital communications

Receivers

Angle modulation

C375S322000, C375S316000, C375S346000, C455S042000, C455S205000, C455S501000, C455S063100, C455S067130, C455S296000, C329S318000, C329S320000

Reexamination Certificate

active

08073079

ABSTRACT:
A threshold noise-canceling method comprising the steps of: receiving an angle-modulated signal; identifying in the angle-modulated signal potential threshold noise events that exceed a first threshold value; calculating average values of the phase of the angle-modulated signal before and after a potential threshold noise event; identifying every potential threshold noise event as a threshold noise event when the difference between the corresponding before and after average values of the phase is greater than a second threshold value; and canceling out each threshold noise event by adding to the phase of the angle-modulated signal a 2π phase shift of polarity opposite to that of the corresponding threshold noise event.

REFERENCES:
patent: 2006/0274641 (2006-12-01), Grieco et al.
Ahmed, Ahsen U.; Thompson, Steve C.; Zeidler, James R.; “Threshold Extending Receiver Structures for CE-OFDM;” Military Communications Conference, 2007. MILCOM 2007. (Oct. 29, 2007).
M. Polacek, S. Shamai, and I. Bar-David, “On FM Threshold Extension by Click Noise Elimination,” IEEE Trans. on Comm., vol. 36, No. 3, Mar. 1988.

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