Active interference cancellation
First Claim
1. An apparatus comprising:
- a processing device; and
radio frequency front-end (RFFE) circuitry coupled to the processing device, the RFFE circuitry comprisinga vector modulator disposed along an electrical path between a transmit path to a first antenna and a receive path from a second antenna, wherein the processing device is operable to match a delay in the electrical path to a propagation delay in an antenna path, wherein the processing device is operable to control the vector modulator to adjust a phase, an amplitude or both of a copy of a first RF signal to generate a third RF signal that is added to a second RF signal received via the second antenna to remove interference caused by the first RF signal transmitted via the first antenna, wherein the processing device is operable to determine a phase and an amplitude for the third RF signal that results in a minimum power by the second RF signal by;
setting a phase resolution to a first value;
determining a first phase of the third RF signal with the phase resolution set to the first value;
setting an amplitude resolution to a second value;
determining a second amplitude of the third RF signal with the amplitude resolution set to the second value;
setting the phase resolution to a third value;
determining the phase of the third RF signal with the phase resolution set to the third value;
setting the amplitude resolution to a fourth value;
determining the amplitude of the third RF signal with the amplitude resolution set to the fourth value;
setting the phase resolution to a fifth value;
determining the phase of the third RF signal with the phase resolution set to the fifth value;
setting the amplitude resolution to a sixth value; and
determining the amplitude of the third RF signal with the amplitude resolution set to the sixth value.
1 Assignment
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Accused Products
Abstract
Antenna structures and methods of operating the same are described. One apparatus includes a processing device that executes an active interference cancellation (AIC) algorithm and radio frequency front-end (RFFE) circuitry coupled to the processing device. The RFFE circuitry includes two RF couplers, and a programmable-delay filter and a vector modulator disposed along electrical path. The AIC algorithm is operable to control the programmable-delay filter to match a delay of the electrical path to a propagation delay in an antenna path. The AIC algorithm is operable to control the vector modulator to adjust a phase, an amplitude or both of a copy of a first RF signal transmitted via the first antenna to generate a second RF signal. The second RF signal is added to a third RF signal via the second RF coupler to remove from the third RF signal interference caused by the first RF signal.
20 Citations
16 Claims
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1. An apparatus comprising:
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a processing device; and radio frequency front-end (RFFE) circuitry coupled to the processing device, the RFFE circuitry comprising a vector modulator disposed along an electrical path between a transmit path to a first antenna and a receive path from a second antenna, wherein the processing device is operable to match a delay in the electrical path to a propagation delay in an antenna path, wherein the processing device is operable to control the vector modulator to adjust a phase, an amplitude or both of a copy of a first RF signal to generate a third RF signal that is added to a second RF signal received via the second antenna to remove interference caused by the first RF signal transmitted via the first antenna, wherein the processing device is operable to determine a phase and an amplitude for the third RF signal that results in a minimum power by the second RF signal by; setting a phase resolution to a first value; determining a first phase of the third RF signal with the phase resolution set to the first value; setting an amplitude resolution to a second value; determining a second amplitude of the third RF signal with the amplitude resolution set to the second value; setting the phase resolution to a third value; determining the phase of the third RF signal with the phase resolution set to the third value; setting the amplitude resolution to a fourth value; determining the amplitude of the third RF signal with the amplitude resolution set to the fourth value; setting the phase resolution to a fifth value; determining the phase of the third RF signal with the phase resolution set to the fifth value; setting the amplitude resolution to a sixth value; and determining the amplitude of the third RF signal with the amplitude resolution set to the sixth value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method comprising:
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instructing, by a processing device, a first transceiver to transmit a first radio frequency (RF) signal via a first antenna; instructing, by the processing device, a second transceiver to receive a second RF signal via a second antenna, the second RF signal includes interference from the first RF signal transmitted through an antenna path from the first antenna to the second antenna; controlling, by the processing device, a first programmable-delay filter, disposed in an electrical path between the first transceiver and the second transceiver, to match a delay in the electrical path to a propagation delay in the antenna path; determining, by the processing device, an amplitude and a phase for a third RF signal that result in a minimum power by the second RF signal by iteratively determining the phase of the third RF signal using a phase resolution set to a first plurality of values, one value at a time, and by iteratively determining the amplitude of the third RF signal using an amplitude resolution set to a second plurality of values, one value at a time; and controlling, by the processing device, a first vector modulator, disposed in the electrical path, to generate the third RF signal by adjusting a phase, an amplitude or both of a copy of a first RF signal transmitted via the first antenna such that the third RF signal comprises the amplitude and the phase determined by the processing device, wherein the third RF signal is added to the second RF signal received via the second antenna to remove the interference from the first RF signal. - View Dependent Claims (11, 12, 13, 14)
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15. A method comprising:
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instructing, by a processing device, a first transceiver to transmit a first radio frequency (RF) signal via a first antenna; instructing, by the processing device, a second transceiver to receive a second RF signal via a second antenna, the second RF signal includes interference from the first RF signal transmitted through an antenna path from the first antenna to the second antenna; matching, by the processing device, a delay in an electrical path between the first transceiver and the second transceiver to a propagation delay in the antenna path; controlling, by the processing device, a first vector modulator, disposed in the electrical path, to generate a third RF signal by adjusting a phase, an amplitude or both of a copy of a first RF signal transmitted via the first antenna, wherein the third RF signal is added to the second RF signal received via the second antenna to remove the interference from the first RF signal; and determining, by the processing device, an amplitude and a phase for the third RF signal that result in a minimum power by the second RF signal, wherein the determining the amplitude and the phase comprises; setting a phase resolution to a first value; determining a phase of the third RF signal with the phase resolution set to the first value; setting an amplitude resolution to a second value; determining an amplitude of the third RF signal with the amplitude resolution set to the second value; setting the phase resolution to a third value; determining the phase of the third RF signal with the phase resolution set to the third value; setting the amplitude resolution to a fourth value; determining the amplitude of the third RF signal with the amplitude resolution set to the fourth value; setting the phase resolution to a fifth value; determining the phase of the third RF signal with the phase resolution set to the fifth value; setting the amplitude resolution to a sixth value; and determining the amplitude of the third RF signal with the amplitude resolution set to the sixth value. - View Dependent Claims (16)
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Specification