Off-line channel tuning amplitude slope matched filter architecture
First Claim
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1. An interference cancellation system, comprising:
- (A) an adaptively tuned sloped control (ATSC) module 200 for providing a tuning procedure directed to an ASMF control function to the band of interference and for externally controlling the ASMF control function subsequent to said tuning, said adaptively tuned sloped control (ATSC) module (200) comprising;
a) an inline variable lobe filter structure (VLFS) 201 for providing controlled variable time delay for generating;
(1) a first broadband RF lobed filter formed by a delay T−
Δ
T, a second broadband RF lobed filter formed by a delay T+Δ
T, and (3) a slope control filter lobe formed by a first delay T 205 and a second delay (2nT) (208) yield a total time delay of (2n+1)T centered in the null of the imaginary broadband RF lobed nulling filter and skewed by an external slope control signal;
b) an offline time delay tuning control (TDTC) element (202) for receiving signal samples output from the inline variable lobe filter structure (VLFS) (201) to control a first variable time delay element (T) (205) of the inline variable lobe filter structure (VLFS) 201 to provide said controlled variable time delay to generate said broadband RF tuning filter and a second variable time delay element (2nT) (208) of the inline variable lobe filter structure (VLFS) 201 to provide said controlled variable time delay to generate said slope control filter lobe;
(B) an adaptive control loop (ACL) (6) for adjusting a complex weighting of a delayed coupled signal to maximally cancel a propagated received signal (30).
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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 interference cancellation system performance. The tuning control system is provided as an element of an interference cancellation system.
16 Citations
8 Claims
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1. An interference cancellation system, comprising:
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(A) an adaptively tuned sloped control (ATSC) module 200 for providing a tuning procedure directed to an ASMF control function to the band of interference and for externally controlling the ASMF control function subsequent to said tuning, said adaptively tuned sloped control (ATSC) module (200) comprising; a) an inline variable lobe filter structure (VLFS) 201 for providing controlled variable time delay for generating;
(1) a first broadband RF lobed filter formed by a delay T−
Δ
T, a second broadband RF lobed filter formed by a delay T+Δ
T, and (3) a slope control filter lobe formed by a first delay T 205 and a second delay (2nT) (208) yield a total time delay of (2n+1)T centered in the null of the imaginary broadband RF lobed nulling filter and skewed by an external slope control signal;b) an offline time delay tuning control (TDTC) element (202) for receiving signal samples output from the inline variable lobe filter structure (VLFS) (201) to control a first variable time delay element (T) (205) of the inline variable lobe filter structure (VLFS) 201 to provide said controlled variable time delay to generate said broadband RF tuning filter and a second variable time delay element (2nT) (208) of the inline variable lobe filter structure (VLFS) 201 to provide said controlled variable time delay to generate said slope control filter lobe; (B) an adaptive control loop (ACL) (6) for adjusting a complex weighting of a delayed coupled signal to maximally cancel a propagated received signal (30). - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification