Remote interference cancellation for communications systems
First Claim
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1. An interference cancellation system (ICS) comprising:
- an interference estimation processor configured to;
select a first interference estimation technique of a plurality of interference estimation techniques for estimating an interference signal that is received from a remote location, wherein the first interference estimation technique is selected based on at least a power level of the interference signal relative to a power level of a signal of interest (SOI), andgenerate an estimated interference signal using the first interference estimation technique; and
an interference cancellation processor configured to;
receive the estimated interference signal and a combined signal, wherein the combined signal comprises a combination of the interference signal and the SOI,convert the estimated interference signal and the combined signal to optical signals,apply a 180 degree phase shift to one of the estimated interference signal or the combined signal,variably attenuate and variably time delay one or more of the estimated interference signal or the combined signal,combine the estimated interference signal and the combined signal, andconvert the combination of the estimated interference signal and the combined signal into a radio frequency (RF) signal.
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Abstract
An interference cancellation system (ICS) may be used with a communication system to prevent or minimize interference from one or more sources. The ICS may receive radio frequency (RF) signals comprised of one or more signals of interest (SOI) and multiple interfering signals. An interference estimation processor (IEP) may be used to estimate the one or more interfering signals. The interfering signals may be estimated using spatial and/or time diversity, which may be combined with statistical methods. The estimated interfering signals may be sent to the ICS, which may use the estimated interference signal to cancel the interference and output the SOI.
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Citations
20 Claims
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1. An interference cancellation system (ICS) comprising:
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an interference estimation processor configured to; select a first interference estimation technique of a plurality of interference estimation techniques for estimating an interference signal that is received from a remote location, wherein the first interference estimation technique is selected based on at least a power level of the interference signal relative to a power level of a signal of interest (SOI), and generate an estimated interference signal using the first interference estimation technique; and an interference cancellation processor configured to; receive the estimated interference signal and a combined signal, wherein the combined signal comprises a combination of the interference signal and the SOI, convert the estimated interference signal and the combined signal to optical signals, apply a 180 degree phase shift to one of the estimated interference signal or the combined signal, variably attenuate and variably time delay one or more of the estimated interference signal or the combined signal, combine the estimated interference signal and the combined signal, and convert the combination of the estimated interference signal and the combined signal into a radio frequency (RF) signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for cancelling interference, the method comprising:
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selecting a first interference estimation technique of a plurality of interference estimation techniques for estimating an interference signal that is received from a remote location, wherein the first interference estimation technique is selected based on at least a power level of the interference signal relative to a power level of a signal of interest (SOI); generating an estimated interference signal using the first interference estimation technique; receiving a combined signal, wherein the combined signal comprises a combination of the interference signal and the SOI; converting the estimated interference signal and the combined signal to optical signals, applying a 180 degree phase shift to one of the estimated interference signal or the combined signal; variably attenuating and variably time delaying one or more of the estimated interference signal or the combined signal; combining the estimated interference signal and the combined signal, and converting the combination of the estimated interference signal and the combined signal into a radio frequency (RF) signal. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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19. An interference cancellation system (ICS) comprising:
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an interference estimation processor configured to; select a first interference estimation technique of a plurality of interference estimation techniques for estimating an interference signal that is received from a remote location, wherein the first interference estimation technique is selected based on at least a location of a source of the interference signal relative to a location of a source of a signal of interest (SOI), and generate an estimated interference signal using the first interference estimation technique; and an interference cancellation processor configured to; receive the estimated interference signal and a combined signal, wherein the combined signal comprises a combination of the interference signal and the SOI, convert the estimated interference signal and the combined signal to optical signals, apply a 180 degree phase shift to one of the estimated interference signal or the combined signal, variably attenuate and variably time delay one or more of the estimated interference signal or the combined signal, combine the estimated interference signal and the combined signal, and convert the combination of the estimated interference signal and the combined signal into a radio frequency (RF) signal. - View Dependent Claims (20)
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Specification