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US 12,224,789 B2Granted
Systems and methods for tunable out-of-band interference mitigation
AssigneeQUALCOMM Incorporated
InventorsJung-il Choi, Mayank Jain, Wilhelm Steffen Hahn, Alfred Riddle
Life of this patent
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Abstract
A system for interference mitigation includes: a transmit coupler; a receive coupler; a duplexer; and an interference cancellation module that includes a receive-band filter, a transmit-band filter, and an interference cancellation system.
Claims20
A system for interference mitigation, comprising:
- a transmit coupler communicatively coupled to an analog transmit signal of a communication system, the transmit coupler communicatively coupling the analog transmit signal to a transmit path and to an interference cancellation path, wherein the communication system is associated with a transmit band and a receive band;
- a first receive coupler communicatively coupled to an analog receive signal of the communication system via a receive path, the first receive coupler communicatively coupling the receive path and the interference cancellation path to an output;
- a duplexer communicatively coupling the transmit path and the receive path to an antenna of the communication system;
- and
- an interference cancellation module arranged along the interference cancellation path between the transmit coupler and the first receive coupler, the interference cancellation module comprising:
- a receive-band filter, wherein a first side of the receive-band filter is connected proximal to the transmit coupler along the interference cancellation path, and wherein the receive-band filter is configured to filter signals on the interference cancellation path to reduce signal power outside the receive band;
- a transmit-band filter, wherein a first side of the transmit-band filter is connected proximal to a second receive coupler along the interference cancellation path, wherein the transmit-band filter is configured to filter signals on the interference cancellation path to reduce signal power outside the transmit band;
- and
- an interference cancellation system connected between a second side of the receive-band filter and a second side of the transmit-band filter, the interference cancellation system comprising a transmit band interference cancellation system in parallel with a receive band interference cancellation system;
- wherein the interference cancellation system is configured to sample a filtered analog transmit signal from the interference cancellation path via the receive-band filter, generate an analog interference cancellation signal based on the filtered analog transmit signal, and output the analog interference cancellation signal to the interference cancellation path via the transmit-band filter;
- and
- wherein the second receive coupler is configured to combine the analog interference cancellation signal with the analog receive signal, wherein the second receive coupler is separate from the first receive coupler.
9 more elements
A method for interference mitigation, comprising:
- filtering, using a receive-band filter of an interference cancellation module included in an interference mitigation system, signals on an interference cancellation path of the interference mitigation system to reduce signal power outside of a receive band associated with a communication system, wherein a first side of the receive-band filter is connected proximal to a transmit coupler of the interference mitigation system along the interference cancellation path, wherein the transmit coupler is communicatively coupled to an analog transmit signal of the communication system and communicatively couples the analog transmit signal to a transmit path of the communication system and to the interference cancellation path, wherein the interference cancellation module is arranged along the interference cancellation path between the transmit coupler and a first receive coupler of the interference mitigation system, wherein the first receive coupler is communicatively coupled to an analog receive signal of the communication system via a receive path and communicatively couples the receive path and the interference cancellation path to an output.;
- filtering, using a transmit-band filter of the interference cancellation module, signals on the interference cancellation path to reduce signal power outside of a transmit band associated with the communication system, wherein a first side of the transmit-band filter is connected proximal to a second receive coupler along the interference cancellation path, wherein the second receive coupler is separate from the first receive coupler, wherein an interference cancellation system connected between a second side of the receive-band filter and a second side of the transmit-band filter comprises a transmit band interference cancellation system in parallel with a receive band interference cancellation system;
- sample, using the interference cancellation module, a filtered analog transmit signal from the interference cancellation path via the receive-band filter;
- generate, using the interference cancellation module, an analog interference cancellation signal based on the filtered analog transmit signal;
- output, from the interference cancellation module, the analog interference cancellation signal to the interference cancellation path via the transmit-band filter;
- and
- combine, using the second receive coupler, the analog interference cancellation signal with the analog receive signal.
4 more elements
Dependencies are inferred from the claim text.