Adaptive techniques for full duplex communications
First Claim
1. A method for residually-tuned self-interference cancellation comprising:
- converting a digital transmit signal of a communication system into a Radio Frequency (RF) transmit signal;
wherein the RF transmit signal is an analog signal having a first center frequency;
wherein the first center frequency is a radio frequency;
sampling the RF transmit signal;
transmitting, at a transmit antenna of the communication system, the RF transmit signal;
receiving, at a receive antenna of the communication system, an RF receive signal of the communication system;
wherein the RF receive signal is an analog signal having a second center frequency;
wherein the second center frequency is identical to the first center frequency;
transforming, in an RF domain and without performing frequency downconversion, the sampled RF transmit signal into an RF self-interference cancellation signal;
wherein transforming the sampled RF transmit signal comprises;
attenuating, according to an attenuation setting of an adapter, the sampled RF transmit signal;
delaying, according to a delay setting of the adapter, the sampled RF transmit signal;
andinverting the sampled RF transmit signal;
combining, over a wired cancellation path, in order to remove a first portion of self-interference from the RF receive signal, the RF self-interference cancellation signal with the RF receive signal, resulting in a reduced-interference RF receive signal;
sampling the reduced-interference RF receive signal; and
modifying, using the adapter and according to a gradient descent algorithm, both of the attenuation setting and the delay setting in order to reduce a measured magnitude of the sampled reduced-interference RF receive signal.
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Accused Products
Abstract
In one aspect there is provided a method. The method may include receiving a first analog radio frequency signal including a signal of interest and an interference signal caused by a second analog radio frequency signal transmitted in full duplex over a channel from which the first analog transmission is received; adjusting at least one of the first analog radio frequency signal and a portion of the second analog radio frequency signal to enable at least one of a reduction or an elimination of the interference signal in an output analog radio frequency signal; combining the first analog radio frequency signal and the portion of the second analog radio frequency signal to generate the output analog radio frequency signal characterized by at least the reduction or the elimination of the interference signal included in the output analog radio frequency signal; and providing the output analog radio frequency signal. Related apparatus, systems, methods, and articles are also described.
146 Citations
19 Claims
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1. A method for residually-tuned self-interference cancellation comprising:
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converting a digital transmit signal of a communication system into a Radio Frequency (RF) transmit signal;
wherein the RF transmit signal is an analog signal having a first center frequency;
wherein the first center frequency is a radio frequency;sampling the RF transmit signal; transmitting, at a transmit antenna of the communication system, the RF transmit signal; receiving, at a receive antenna of the communication system, an RF receive signal of the communication system;
wherein the RF receive signal is an analog signal having a second center frequency;
wherein the second center frequency is identical to the first center frequency;transforming, in an RF domain and without performing frequency downconversion, the sampled RF transmit signal into an RF self-interference cancellation signal;
wherein transforming the sampled RF transmit signal comprises;attenuating, according to an attenuation setting of an adapter, the sampled RF transmit signal; delaying, according to a delay setting of the adapter, the sampled RF transmit signal; and inverting the sampled RF transmit signal; combining, over a wired cancellation path, in order to remove a first portion of self-interference from the RF receive signal, the RF self-interference cancellation signal with the RF receive signal, resulting in a reduced-interference RF receive signal; sampling the reduced-interference RF receive signal; and modifying, using the adapter and according to a gradient descent algorithm, both of the attenuation setting and the delay setting in order to reduce a measured magnitude of the sampled reduced-interference RF receive signal. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method for self-interference cancellation comprising:
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sampling a Radio Frequency (RF) transmit signal;
wherein the RF transmit signal is an analog signal having a first center frequency;
wherein the first center frequency is a radio frequency;transmitting, at a transmit antenna of a communication system, the RF transmit signal; receiving, at a receive antenna of the communication system, an RF receive signal of the communication system;
wherein the RF receive signal is an analog signal having a second center frequency;transforming, in an RF domain and without performing frequency downconversion, the sampled RF transmit signal into an RF self-interference cancellation signal;
whereintransforming the sampled RF transmit signal comprises; attenuating, according to an attenuation setting of an adapter, the sampled RF transmit signal; delaying, according to a delay setting of the adapter, the sampled RF transmit signal; and inverting the sampled RF transmit signal; combining, over a wired cancellation path, in order to remove a first portion of self-interference from the RF receive signal, the RF self-interference cancellation signal with the RF receive signal, resulting in a reduced-interference RF receive signal; sampling the reduced-interference RF receive signal; and modifying, using the adapter, both of the attenuation setting and the delay setting in order to reduce a measured magnitude of the sampled reduced-interference RF receive signal. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A system for self-interference cancellation comprising:
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a transmitter, coupled to a transmit antenna, that transmits a Radio Frequency (RF) transmit signal having a first center frequency;
wherein the first center frequency is a radio frequency;a signal splitter, communicatively coupled to the RF transmit signal, that samples the RF transmit signal to create a sampled RF transmit signal; a receiver, coupled to a receive antenna, that receives an RF receive signal having a second center frequency;
wherein the second center frequency is a radio frequency;an RF self-interference canceller, coupled to the signal splitter, that transforms, in a RF domain and without performing frequency downconversion, the sampled RF transmit signal into an RF self-interference cancellation signal;
wherein the RF self-interference canceller comprises a tunable attenuator, an inverter, a delayer, and a tunable phase shifter;a signal combiner, communicatively coupled to the RF self-interference cancellation signal and to the RF receive signal by wired signal paths, that combines the RF self-interference cancellation signal and the RF receive signal to produce a reduced-interference RF receive signal;
wherein the reduced-interference RF receive signal is characterized by reduction of a first portion of self-interference relative to the RF receive signal;an adapter, communicatively coupled to the reduced-interference RF receive signal, that iteratively modifies settings of the tunable attenuator, the delayer, and the tunable phase shifter to reduce self-interference present in the reduced-interference RF receive signal. - View Dependent Claims (14, 15, 16, 17, 18, 19)
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Specification