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 generate an estimated interference signal using a spatial diversity interference estimation technique based on one or more signals received over the air via an antenna array, wherein the spatial diversity interference estimation technique comprises an independent component analysis of interference signal components received via the antenna array, and the independent component analysis comprises a second order decorrelation of the interference signal components received via the antenna array; 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 a signal of interest (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.
47 Citations
13 Claims
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1. An interference cancellation system (ICS) comprising:
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an interference estimation processor configured to generate an estimated interference signal using a spatial diversity interference estimation technique based on one or more signals received over the air via an antenna array, wherein the spatial diversity interference estimation technique comprises an independent component analysis of interference signal components received via the antenna array, and the independent component analysis comprises a second order decorrelation of the interference signal components received via the antenna array; 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 a signal of interest (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)
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6. A method comprising:
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generating an estimated interference signal using a spatial diversity interference estimation technique based on one or more signals received over the air via an antenna array, wherein the spatial diversity interference estimation technique comprises performing an independent component analysis of interference signal components received via the antenna array, and performing the independent component analysis comprises performing a second order decorrelation of the interference signal components; receiving a combined signal, wherein the combined signal comprises a combination of the interference signal and a signal of interest (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 (7, 8, 9, 10)
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11. An interference cancellation system (ICS) comprising processor circuitry configured to:
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generate an estimated interference signal using a spatial diversity interference estimation technique based on one or more signals received over the air via an antenna array, wherein the spatial diversity interference estimation technique comprises performing an independent component analysis of interference signal components received via the antenna array, and performing the independent component analysis comprises performing a second order decorrelation of the interference signal components; receive a combined signal, wherein the combined signal comprises a combination of the interference signal and a signal of interest (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 (12, 13)
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Specification