System and method for transmitter leak-over cancellation with closed loop optimization
First Claim
1. A method comprising:
- transmitting a first signal via a transmit chain in a wireless device, wherein a first portion of the first signal leaks over into a receive chain of the wireless device and generates higher order products that interfere with a second signal being received by the wireless device;
diverting a second portion of the first signal from the transmit chain into cancellation circuitry coupled to the receive chain to manipulate an amplitude and phase of the second portion before combining the manipulated second portion with the second signal and first portion to at least partially cancel interference caused by the first portion;
after downconverting, filtering a remainder portion of the first portion from the second signal in the receive chain, wherein the remainder portion was not cancelled by the manipulated second portion;
detecting a power level of the remainder portion;
comparing the power level to a threshold value; and
modifying an amplitude and phase configuration of the cancellation circuitry based on a result of comparing the power level to the threshold value.
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Accused Products
Abstract
The present disclosure relates generally to systems and methods for transmitter leak-over cancellation. In one example, a method includes transmitting a signal via a transmit chain in a wireless device, where a portion of the signal leaks over into a receive chain of the wireless device. A portion of the signal is diverted from the transmit chain into cancellation circuitry coupled to the receive chain to manipulate an amplitude and phase of the portion before combining the manipulated portion with the signal and other portion to at least partially cancel interference caused by the leak-over portion. After downconverting, a remainder portion is filtered from the received signal. A power level of the remainder portion is detected and compared to a threshold value. An amplitude and phase configuration of the cancellation circuitry is modified based on a result of comparing the power level to the threshold value.
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Citations
23 Claims
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1. A method comprising:
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transmitting a first signal via a transmit chain in a wireless device, wherein a first portion of the first signal leaks over into a receive chain of the wireless device and generates higher order products that interfere with a second signal being received by the wireless device; diverting a second portion of the first signal from the transmit chain into cancellation circuitry coupled to the receive chain to manipulate an amplitude and phase of the second portion before combining the manipulated second portion with the second signal and first portion to at least partially cancel interference caused by the first portion; after downconverting, filtering a remainder portion of the first portion from the second signal in the receive chain, wherein the remainder portion was not cancelled by the manipulated second portion; detecting a power level of the remainder portion; comparing the power level to a threshold value; and modifying an amplitude and phase configuration of the cancellation circuitry based on a result of comparing the power level to the threshold value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method comprising:
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isolating a transmitted signal from a received signal in a wireless device that uses separate frequency channels for simultaneous transmission and reception; detecting a power level of a leaked over signal portion of the transmitted signal, wherein the leaked over signal portion has leaked over into the received signal; comparing the power level to a threshold value; altering at least one of an amplitude and a phase of a cancellation portion of the transmitted signal being diverted from the transmit chain; and combining the cancellation portion with the received signal to at least partially cancel the leaked over signal portion. - View Dependent Claims (16, 17, 18, 19)
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20. A circuit comprising:
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a duplexer coupling a portion of a transmit chain and a receive chain in a wireless device that uses separate frequency channels for simultaneous transmission and reception, wherein the duplexer is configured to isolate a transmitted signal in the transmit chain from a received signal in the receive chain; a directional coupler coupled to the transmit chain and configured to divert a portion of the transmitted signal from the transmit chain to amplitude and phase matching circuitry; amplitude and phase matching circuitry coupled to the receive chain and the directional coupler, wherein the amplitude and phase matching circuitry includes circuitry configured to manipulate the diverted portion to create destructive interference for a portion of the transmitted signal that leaks over into the receive chain; and closed loop control circuitry having a detector configured to detect a remaining portion of the transmitted signal that leaks over into the receive chain and a comparator to compare the detected remaining portion with a threshold value, wherein the closed loop control is configured to control the amplitude and phase matching circuitry based on an output of the comparator. - View Dependent Claims (21, 22, 23)
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Specification