Broadband interference cancellation
First Claim
1. A method comprising:
- applying a time delay to a signal sampled from an interference signal to provide substantially broadband cancellation of the interference signal.
2 Assignments
0 Petitions
Accused Products
Abstract
A method and apparatus are provided for broadband cancellation of interference signals. A signal transmitted on one communication path acts as an interference signal to a receiver on a second communication path in the system. In an embodiment, a signal transmitted from an antenna using one wireless standard, or protocol, acts as an interference signal for another antenna, co-located in the same system, using another wireless standard, or protocol, and operating in the same or nearby frequency bands. A time delay is applied to a signal sampled from the interference signal to provide substantially broadband cancellation of the interference signal. The sampled signal may be attenuated to match the amplitude of the interference signal on the second communication path. Coupling of the sampled signal from one communication path to the other communication path can provide an 180° phase shift to the sampled signal.
94 Citations
30 Claims
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1. A method comprising:
applying a time delay to a signal sampled from an interference signal to provide substantially broadband cancellation of the interference signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method comprising:
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providing a time delay to a correction signal propagating from a first signal path to a second signal path;
adjusting an amplitude of the correction signal; and
periodically resetting the time delay and adjusting the amplitude of the correction signal to provide substantially broadband cancellation of an interference signal propagating over an interference path between the first signal path and the second signal path, the interference path separate from a primary path of the correction signal. - View Dependent Claims (10, 11, 12)
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13. An apparatus comprising:
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a first signal path;
a second signal path;
an adjustable delay line to provide a time delay to a correction signal propagating from the first signal path to the second signal path; and
a variable attenuator coupled to the adjustable delay line such that the correction signal matches an interference signal propagating from the first signal path to the second signal path to provide substantial broadband cancellation of the interference signal. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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24. A system comprising:
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a processor;
a memory coupled to the processor;
a first signal path on which signals responsive to the processor are transmitted;
a first antenna coupled to the first signal path to transmit the signals from the first signal path;
a second signal path on which signals to provide a communication to the processor are received;
an adjustable delay line to provide a time delay to a correction signal propagating from the first signal path to the second signal path; and
a variable attenuator coupled to the adjustable delay line such that the correction signal matches an interference signal propagating from the first signal path to the second signal path to provide substantial broadband cancellation of the interference signal. - View Dependent Claims (25, 26, 27, 28, 29, 30)
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Specification