System and method for transmitter leak-over cancellation
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, wherein the second portion is diverted prior to a location in the transmit chain where leak-over occurs;
manipulating an amplitude and phase of the second portion; and
combining the manipulated second portion with the second signal and the first portion to at least partially cancel interference caused by the first portion leaking over into the receive chain.
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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 and generates higher order products that interfere with a signal being received by the wireless device. A portion of the signal from the transmit chain is diverted into cancellation circuitry coupled to the receive chain prior to a location in the transmit chain where leak-over occurs, and an amplitude and phase of the portion is manipulated. The manipulated portion is combined with the received signal and other portion to at least partially cancel interference caused by the portion leaking over into the receive chain.
50 Citations
21 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, wherein the second portion is diverted prior to a location in the transmit chain where leak-over occurs; manipulating an amplitude and phase of the second portion; and combining the manipulated second portion with the second signal and the first portion to at least partially cancel interference caused by the first portion leaking over into the receive chain. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. 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; directing a second portion of the first signal diverted from the transmit chain into cancellation circuitry coupled to the receive chain; and manipulating 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. - View Dependent Claims (11, 12, 13)
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14. 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; and 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. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21)
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Specification