Interference rejection in ultra-wideband real time locating systems
First Claim
1. An ultra-wideband (UWB) receiver comprising:
- an antenna configured to receive a composite signal, the composite signal comprising a UWB signal and an interference signal;
a tunable notch filter comprising a first mixer, a notch filter, a second mixer, a splitter, and a voltage controlled oscillator, the tunable notch filter configured to attenuate a part of the composite signal representing the interference signal thereby generating a filtered signal;
a detector configured to receive the filtered signal from the tunable notch filter;
a bias amplifier configured to;
receive an output of the detector; and
indicate changes in an operating point of the detector based on the output; and
a controller configured to;
monitor the changes indicated by the bias amplifier to determine an interference level associated with the filtered signal; and
adjust the tunable notch filter to reduce the interference level in an instance in which the interference level is above a threshold level.
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Accused Products
Abstract
Systems, methods, apparatuses, and computer readable media are disclosed for providing interference rejection in ultra-wideband real time locating systems. In one embodiment, an ultra-wideband (UWB) receiver is configured to: receive a composite signal, the composite signal comprising a UWB signal transmitted from within a monitored region and an interference signal transmitted from a source positioned outside the monitored region; filtering at least a first component of the composite signal representing the interference signal with a tunable notch filter to generate a filtered signal; determining an interference level in the filtered signal; and adjust the tunable notch filter to reduce the interference level. Corresponding systems, methods, and computer-readable storage medium are also provided.
182 Citations
17 Claims
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1. An ultra-wideband (UWB) receiver comprising:
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an antenna configured to receive a composite signal, the composite signal comprising a UWB signal and an interference signal; a tunable notch filter comprising a first mixer, a notch filter, a second mixer, a splitter, and a voltage controlled oscillator, the tunable notch filter configured to attenuate a part of the composite signal representing the interference signal thereby generating a filtered signal; a detector configured to receive the filtered signal from the tunable notch filter; a bias amplifier configured to; receive an output of the detector; and indicate changes in an operating point of the detector based on the output; and a controller configured to; monitor the changes indicated by the bias amplifier to determine an interference level associated with the filtered signal; and adjust the tunable notch filter to reduce the interference level in an instance in which the interference level is above a threshold level. - View Dependent Claims (2, 3, 4, 5)
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6. A method for providing interference rejection, the method comprising:
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receiving a composite signal, the composite signal comprising a ultra-wideband (UWB) signal transmitted from within a monitored region and an interference signal transmitted from a source positioned outside the monitored region; filtering at least a first component of the composite signal representing the interference signal using a tunable notch filter to generate a filtered signal, the tunable notch filter comprising a first mixer, a notch filter, a second mixer, a splitter, and a voltage controlled oscillator; providing the filtered signal to a detector; determining, via a bias amplifier, changes in an operating point of the detector; monitoring, via a processor, the changes indicated by the bias amplifier to determine an interference level in the filtered signal; and adjusting, via the processor, the tunable notch filter to reduce the interference level in an instance in which the determined interference level is above a threshold level. - View Dependent Claims (7, 8, 9, 10, 11)
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12. An apparatus for providing interference rejection, the apparatus comprising a processor and a memory including computer program code, the memory and the computer program code configured to, with the processor, cause the apparatus at least to:
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receive a composite signal, the composite signal comprising a ultra-wideband (UWB) signal transmitted from within a monitored region and an interference signal transmitted from a source positioned outside the monitored region; filter at least a first component of the composite signal representing the interference signal using a tunable notch filter to generate a filtered signal, the tunable notch filter comprising a first mixer, a notch filter, a second mixer, a splitter, and a voltage controlled oscillator; provide the filtered signal to a detector; determine, via a bias amplifier, changes in an operating point of the detector; monitor the changes determined by the bias amplifier to determine an interference level in the filtered signal; and adjust the tunable notch filter to reduce the interference level in an instance in which the determined interference level is above a threshold level. - View Dependent Claims (13, 14, 15, 16, 17)
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Specification