Adaptive filter for transmit leakage signal rejection
First Claim
1. An integrated circuit comprising:
- a summer operative to receive an input signal having a transmit leakage signal and to receive an estimator signal having an estimate of the transmit leakage signal, to subtract the estimator signal from the input signal, and to provide an output signal having the transmit leakage signal attenuated, wherein the transmit leakage signal corresponds to a portion of a modulated signal being transmitted in a wireless full-duplex communication system; and
an estimator operative to receive the output signal and a reference signal having a version of the modulated signal, to estimate the transmit leakage signal in the input signal based on the output signal and the reference signal, and to provide the estimator signal having the estimate of the transmit leakage signal.
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Accused Products
Abstract
An adaptive filter suitable for fabrication on an RF integrated circuit and used for transmit (TX) leakage rejection in a wireless full-duplex communication system is described. The adaptive filter includes a summer and an adaptive estimator. The summer receives an input signal having a TX leakage signal and an estimator signal having an estimate of the TX leakage signal, subtracts the estimator signal from the input signal, and provides an output signal having the TX leakage signal attenuated. The adaptive estimator receives the output signal and a reference signal having a version of the transmit signal, estimates the TX leakage signal in the input signal based on the output signal and the reference signal, and provides the estimator signal. The adaptive estimator may utilize an LMS algorithm to minimize a mean square error between the TX leakage signal in the input signal and the TX leakage signal estimate in the estimator signal.
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Citations
28 Claims
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1. An integrated circuit comprising:
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a summer operative to receive an input signal having a transmit leakage signal and to receive an estimator signal having an estimate of the transmit leakage signal, to subtract the estimator signal from the input signal, and to provide an output signal having the transmit leakage signal attenuated, wherein the transmit leakage signal corresponds to a portion of a modulated signal being transmitted in a wireless full-duplex communication system; and
an estimator operative to receive the output signal and a reference signal having a version of the modulated signal, to estimate the transmit leakage signal in the input signal based on the output signal and the reference signal, and to provide the estimator signal having the estimate of the transmit leakage signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A wireless device in a wireless full-duplex communication system, comprising:
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a low noise amplifier (LNA) operative to amplify a receiver input signal and to provide an input signal having a transmit leakage signal, wherein the transmit leakage signal corresponds to a portion of a modulated signal being transmitted;
an adaptive filter operative to receive the input signal and a reference signal having a version of the modulated signal, to generate an estimator signal having an estimate of the transmit leakage signal based on an output signal and the reference signal, and to subtract the estimator signal from the input signal to obtain the output signal having the transmit leakage signal attenuated; and
a mixer operative to receive and frequency downconvert the output signal with a local oscillator (LO) signal and to provide a downconverted signal. - View Dependent Claims (18, 19, 20)
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21. An apparatus in a wireless full-duplex communication system, comprising:
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means for subtracting an estimator signal from an input signal and providing an output signal, the input signal having a transmit leakage signal, the estimator signal having an estimate of the transmit leakage signal, and the output signal having the transmit leakage signal attenuated, wherein the transmit leakage signal corresponds to a portion of a modulated signal being transmitted; and
means for estimating the transmit leakage signal in the input signal based on the output signal and a reference signal and providing the estimator signal, the reference signal having a version of the modulated signal. - View Dependent Claims (22, 23, 24, 25)
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26. A method of suppressing transmit leakage signal in a wireless full-duplex communication system, comprising:
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subtracting an estimator signal from an input signal to obtain an output signal, the input signal having a transmit leakage signal, the estimator signal having an estimate of the transmit leakage signal, and the output signal having the transmit leakage signal attenuated, wherein the transmit leakage signal is a portion of a modulated signal being transmitted; and
estimating the transmit leakage signal in the input signal based on the output signal and a reference signal having a version of the modulated signal and providing the estimator signal having the estimate of the transmit leakage signal. - View Dependent Claims (27, 28)
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Specification