Interference cancellation in multi-mode radio access technology devices
First Claim
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1. A method for reducing interference in a receiver, comprising:
- receiving a first signal, wherein the first signal includes a desired signal and an undesired signal that results from an interfering signal being applied to a first path;
generating a second signal, wherein generating the second signal comprises applying the interfering signal to a second path;
processing the second signal to generate a third signal, including adjusting the second signal based on a difference between a first transfer function of the first path and a second transfer function of the second path;
subtracting the third signal from the first signal to reduce the undesired signal in the first signal;
collecting measurements and statistics relating to the first signal and the third signal; and
multiplying the third signal by a weighted value, to the subtracting the third signal from the first signal, wherein the weighted value is calculated based on the collected measurements and statistics.
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Abstract
Embodiments of the present disclosure provide a novel multi-mode platform architecture with means for reducing the interference due to both out-of-band (OOB) emissions and inter-modulation distortion (IMD) products caused by a first radio access technology (RAT) transmitter on a co-located second RAT receiver. The multi-mode platform architecture may be used in a variety of wireless devices and with a variety of co-located RATs, including, without limitation, WiFi, LTE, WiMAX, WCDMA, Bluetooth, and Zigbee, for example.
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Citations
30 Claims
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1. A method for reducing interference in a receiver, comprising:
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receiving a first signal, wherein the first signal includes a desired signal and an undesired signal that results from an interfering signal being applied to a first path; generating a second signal, wherein generating the second signal comprises applying the interfering signal to a second path; processing the second signal to generate a third signal, including adjusting the second signal based on a difference between a first transfer function of the first path and a second transfer function of the second path; subtracting the third signal from the first signal to reduce the undesired signal in the first signal; collecting measurements and statistics relating to the first signal and the third signal; and multiplying the third signal by a weighted value, to the subtracting the third signal from the first signal, wherein the weighted value is calculated based on the collected measurements and statistics. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A receiver, comprising:
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a receive path configured to generate a first signal, wherein the first signal includes a desired signal and an undesired signal that results from an interfering signal being applied to a first path; a feedback receive path configured to generate a second signal from the interfering signal; processing circuitry configured to process the second signal to generate a third signal, wherein the processing circuitry is further configured to adjust the second signal based on a difference between a first transfer function of the first path and a second transfer function of the feedback receive path; a cancellation module configured to subtract the third signal from the first signal to reduce the undesired signal in the first signal; and a statistics measurement module configured to collect measurements and statistics relating to the first signal and the third signal, wherein the cancellation module is, further configured to multiple the third signal by a weighted value, prior to subtracting the third signal from the first signal, wherein the weighted value is calculated based on the collected measurements and statistics. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22)
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23. A receiver, comprising:
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a receive path configured to generate a first signal, wherein the first signal includes a desired signal and an undesired signal that results from an interfering signal being applied to a first path; a digital interface configured to generate a second signal from the interfering signal and to convert a sample rate of the second signal according to a sampling rate difference between the desired signal and the interfering signal; processing circuitry configured to process the second signal to generate a third signal, wherein the processing circuitry is further configured to adjust the second signal based on a first transfer function of the first path; and a cancellation module configured to subtract the third signal from the first signal to reduce the undesired signal in the first signal. - View Dependent Claims (24, 25, 26, 27, 28, 29)
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30. A receiver, comprising:
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a receive path configured to generate a first signal, wherein the first signal includes a desired signal and an undesired signal that results from an interfering signal being applied to a first path; a feedback receive path configured to generate a second signal from the interfering signal; processing circuitry configured to process the second signal to generate a third signal, wherein the processing circuitry is further configured to adjust the second signal based on a difference between a first transfer function of the first path and a second transfer function of the feedback receive path; a frequency modulator, implemented within the processing circuitry, configured to convert the second signal to a center frequency, wherein the center frequency is equal to a difference between a transmit center frequency of the interfering signal and a receive center frequency of the desired signal; and a cancellation module configured to subtract the third signal from the first signal to reduce the undesired signal in the first signal.
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Specification