Tuning amplitude slope matched filter architecture
First Claim
1. A method for continuously and automatically frequency tuning a lobed amplitude slope matching filter (ASMF) to an inserted signal to allow tracking of the inserted signal to match a dynamically changing amplitude slope of a second signal for improved interference cancellation system performance, the method comprising:
- a) forming a broadband RF lobed filter having a single quiescent null within a frequency band of interest;
b) dynamically adjusting a delay time (T) for tuning the single quiescent null of the formed broadband RF lobed filter to effectively block an interfering signal to be tracked;
c) forming a more narrowband RF lobed filter;
d) skewing the narrowband RF lobed filter to implement a corrective amplitude slope of the inserted signal, thereby improving the performance in the improved interference cancellation system; and
e) repeating steps (a)-(d).
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Abstract
A tuning control system and associated method is provided for continuously and automatically tuning a lobed amplitude slope matching filter (ASMF) to a band center of an interfering signal to provide improved rejection of an interfering signal coupled from a transmission antenna into a local receive antenna in the presence of local multi-path, thereby providing improved adaptive control loop performance. The tuning control system is provided as an element of an adaptive control loop.
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Citations
16 Claims
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1. A method for continuously and automatically frequency tuning a lobed amplitude slope matching filter (ASMF) to an inserted signal to allow tracking of the inserted signal to match a dynamically changing amplitude slope of a second signal for improved interference cancellation system performance, the method comprising:
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a) forming a broadband RF lobed filter having a single quiescent null within a frequency band of interest; b) dynamically adjusting a delay time (T) for tuning the single quiescent null of the formed broadband RF lobed filter to effectively block an interfering signal to be tracked; c) forming a more narrowband RF lobed filter; d) skewing the narrowband RF lobed filter to implement a corrective amplitude slope of the inserted signal, thereby improving the performance in the improved interference cancellation system; and e) repeating steps (a)-(d). - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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Specification