Interference cancellation system for cancelling interference in the optical domain
First Claim
1. An interference cancellation system (ICS), the ICS comprising:
- a radio frequency (RF) component subsystem configured to receive a first signal corresponding to an interferer signal and a second signal corresponding a combination of the interferer signal and a signal of interest (SOI);
an optical component subsystem configured to;
receive the first signal and the second signal from the RF component subsystem,apply a 180 degree phase shift to one of the first signal or the second signal,variably attenuate and variably time delay one or more of the first signal and the second signal based on one or more control signals received from a digital component subsystem,combine the first signal and the second signal into a combined signal after variably attenuating and variably time delaying one or more of the first signal and the second signal; and
the digital component subsystem configured to;
generate the control signals based on a power level associated with the combined signal output from the optical component subsystem, andsend the control signals to the optical component subsystem.
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Accused Products
Abstract
Systems and methods for cancelling interference from a received signal in order to properly detect a signal of interest are disclosed. A combined signal of interest plus interference signal may be received. A copy or sample of the interference signal may be determined. The interference signal and the combined signal of interest plus interference signal may be converted to the optical domain. The interference signal may be optically phase shifted by −180 degrees, which may result in an optically inverted interference signal. The optically inverted interference signal may be variably optically attenuated and/or variably optically time delayed, for example based on a detected output power of an optical subsystem of the interference cancellation system. As a result, interference cancellation of the interference signal from the combined signal of interest plus interference signal may be achieved, resulting in 50 dB or more of cancellation of the interference signal.
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Citations
20 Claims
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1. An interference cancellation system (ICS), the ICS comprising:
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a radio frequency (RF) component subsystem configured to receive a first signal corresponding to an interferer signal and a second signal corresponding a combination of the interferer signal and a signal of interest (SOI); an optical component subsystem configured to; receive the first signal and the second signal from the RF component subsystem, apply a 180 degree phase shift to one of the first signal or the second signal, variably attenuate and variably time delay one or more of the first signal and the second signal based on one or more control signals received from a digital component subsystem, combine the first signal and the second signal into a combined signal after variably attenuating and variably time delaying one or more of the first signal and the second signal; and the digital component subsystem configured to; generate the control signals based on a power level associated with the combined signal output from the optical component subsystem, and send the control signals to the optical component subsystem. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. An interference cancellation system (ICS), the ICS comprising:
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radio frequency (RF) circuitry configured to receive a first signal corresponding to an interferer signal and a second signal corresponding a combination of the interferer signal and a signal of interest (SOI); optical circuitry configured to; receive the first and second signals from the RF circuitry, convert the first and second signals from radio frequency signals to optical signals, apply a 180 degree phase shift to the first signal, variably attenuate and variably time delay one or more of the first signal or the second signal based on one or more control signals received from a digital processor circuitry, combine the first signal and the second signal into a combined signal after variably attenuating and variably time delaying one or more of the first signal or the second signal, and convert the combined signal into a combined RF signal; and the digital processor circuitry configured to; generate the control signals based on a power level associated with the combined RF signal output from the optical circuitry, and send the control signals to the optical circuitry. - View Dependent Claims (17, 18, 19, 20)
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Specification