Systems and methods for out-of-band interference mitigation
First Claim
1. A system for out-of-band interference mitigation comprising:
- a transmit coupler, communicatively coupled to a radio-frequency (RF) transmit signal of a communication system, that samples the RF transmit signal to create a sampled RF transmit signal;
wherein the RF transmit signal has a first RF carrier frequency in a transmit band;
a transmit analog canceller that transforms, according to a first configuration state, the sampled RF transmit signal to a first RF interference cancellation signal;
a first receive coupler, communicatively coupled to an RF receive signal of the communication system having a second RF carrier frequency in a receive band, that combines, in order to remove a first portion of interference in the transmit band, the first RF interference cancellation signal and the RF receive signal to generate a composite RF receive signal;
a sampling analog interference filtering system that, in order to remove interference in the transmit band, filters the sampled RF transmit signal to generate a cleaned transmit signal;
a first frequency downconverter that converts the cleaned transmit signal to a baseband (BB) transmit signal having a BB frequency, wherein the BB frequency is less than the first RF carrier frequency;
a second frequency downconverter that converts the composite RF receive signal to a composite BB receive signal;
an analog-to-digital converter that converts the BB transmit signal to a digital transmit signal;
a digital canceller that transforms the digital transmit signal to a digital interference cancellation signal;
a digital-to-analog converter that converts the digital interference cancellation signal to a digitally-sourced analog interference cancellation signal;
a second receive coupler that combines, in order to remove a second portion of interference in the receive band, the digitally-sourced analog interference cancellation signal and the composite BB receive signal; and
a tuning circuit, wherein the tuning circuit receives the composite BB receive signal from the receive path, and wherein the tuning circuit sets the first configuration state based on changes in the composite BB receive signal.
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Accused Products
Abstract
A system for interference mitigation including a transmit coupler that samples the RF transmit signal to create a sampled RF transmit signal; a transmit analog canceller that transforms the RF transmit signal to an RF interference cancellation signal, according to a first configuration state; a first receive coupler that combines the RF interference cancellation signal and the RF receive signal to generate a composite RF receive signal; a sampling analog interference filtering system that, in order to remove interference in the transmit band, filters the sampled RF transmit signal to generate a cleaned transmit signal; a first frequency downconverter that converts the transmit signal to a BB transmit signal; a second frequency downconverter that converts the composite RF receive signal to a composite BB receive signal; and an analog-to-digital converter that converts the transmit signal to a digital transmit signal.
170 Citations
20 Claims
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1. A system for out-of-band interference mitigation comprising:
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a transmit coupler, communicatively coupled to a radio-frequency (RF) transmit signal of a communication system, that samples the RF transmit signal to create a sampled RF transmit signal;
wherein the RF transmit signal has a first RF carrier frequency in a transmit band;a transmit analog canceller that transforms, according to a first configuration state, the sampled RF transmit signal to a first RF interference cancellation signal; a first receive coupler, communicatively coupled to an RF receive signal of the communication system having a second RF carrier frequency in a receive band, that combines, in order to remove a first portion of interference in the transmit band, the first RF interference cancellation signal and the RF receive signal to generate a composite RF receive signal; a sampling analog interference filtering system that, in order to remove interference in the transmit band, filters the sampled RF transmit signal to generate a cleaned transmit signal; a first frequency downconverter that converts the cleaned transmit signal to a baseband (BB) transmit signal having a BB frequency, wherein the BB frequency is less than the first RF carrier frequency; a second frequency downconverter that converts the composite RF receive signal to a composite BB receive signal; an analog-to-digital converter that converts the BB transmit signal to a digital transmit signal; a digital canceller that transforms the digital transmit signal to a digital interference cancellation signal; a digital-to-analog converter that converts the digital interference cancellation signal to a digitally-sourced analog interference cancellation signal; a second receive coupler that combines, in order to remove a second portion of interference in the receive band, the digitally-sourced analog interference cancellation signal and the composite BB receive signal; and a tuning circuit, wherein the tuning circuit receives the composite BB receive signal from the receive path, and wherein the tuning circuit sets the first configuration state based on changes in the composite BB receive signal. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A system for out-of-band interference mitigation comprising:
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a transmit coupler, communicatively coupled to a transmit signal of a communication system, that samples the transmit signal to create a sampled transmit signal;
wherein the transmit signal has a first center frequency in a transmit band and a signal power in the transmit band;a first canceller that transforms the sampled transmit signal to a first interference cancellation signal; a first receive coupler, communicatively coupled to a receive signal of the communication system having a second center frequency in a receive band, that combines, in order to remove a first portion of interference in the transmit band, the first interference cancellation signal and the receive signal to produce a first composite receive signal; a sampling interference filtering system that, in order to remove interference in the transmit band, filters the sampled transmit signal to generate a cleaned transmit signal;
wherein the cleaned transmit signal has a reduced signal power in the transmit band;a second canceller that generates a second interference cancellation signal based on the cleaned transmit signal; a second receive coupler, communicatively coupled to the receive path, that combines, in order to remove a second portion of interference in the receive band, the second interference cancellation signal and the first composite receive signal; and a tuning circuit;
wherein the first canceller transforms the sampled transmit signal to the first interference cancellation signal according to a configuration state;wherein the tuning circuit dynamically sets the configuration state in response to changes in the first composite receive signal. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification