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1. (US20170187404) Systems for integrated self-interference cancellation
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Claims

1. A system for integrated self-interference cancellation, comprising:
a transmit coupler, communicatively coupled to a transmit signal of a full-duplex wireless transceiver, that samples the transmit signal to create a sampled transmit signal;
an analog self-interference canceller, coupled to the transmit coupler, the analog self-interference canceller comprising:
a controller;
a signal divider, that splits the sampled transmit signal into a set of signal components, the set of signal components transmitted by way of a set of transmit paths;
a set of phase shifters, coupled to the set of transmit paths, wherein a phase shifter of the set of phase shifters shifts a signal component of the set of signal components by a total phase shift value; wherein the phase shifter comprises a set of phase shift stages, each stage having a stage phase shift value, the set connected to the phase shifter by a set of switches; wherein the total phase shift value is set by a state configuration of the set of switches and the stage phase shift values of the set of phase shift stages;
a set of scalers, coupled to the set of transmit paths, wherein a scaler of the set of scalers scales the signal component by a total scale factor;
a signal combiner, coupled to the set of transmit paths, that combines the set of signal components into a self-interference cancellation signal; and
a receive coupler, communicatively coupled to a receive signal of the full duplex wireless transceiver, that combines the self-interference cancellation signal with the receive signal to remove at least a first portion of self-interference present in the receive signal.
2. The system of claim 1, wherein the controller generates the state configuration.
3. The system of claim 2, wherein the controller generates the state configuration by computing a desired phase shift output of the phase shifter and selecting the state configuration resulting in a closest total phase shift value to the desired phase shift output.
4. The system of claim 3, wherein the state configuration is selected from a set of state configurations determined according to a hybrid thermometer code.
5. The system of claim 4, wherein each stage phase shift value is predetermined such that the set of state configurations forms a piecewise linear approximation of a phase shift curve.
6. The system of claim 4, wherein the set of phase shift stages comprises a subset of coarse phase shift stages and a subset of fine phase shift stages; wherein the subset of coarse phase shift stages corresponds to a binary component of the hybrid thermometer code; wherein the subset of fine phase shift stages corresponds to a thermometer component of the hybrid thermometer code.
7. The system of claim 2, wherein the controller generates the state configuration by incrementing the state configuration according to a hybrid thermometer code.
8. The system of claim 7, wherein each stage phase shift value is predetermined such that incrementing the state configuration the set of state configurations results in total phase shift values approximating a piecewise linear approximation of a phase shift curve.
9. The system of claim 2, wherein each phase shift stage comprises an LC network.
10. A system for integrated self-interference cancellation, comprising:
a transmit coupler, communicatively coupled to a transmit signal of a full-duplex wireless transceiver, that samples the transmit signal to create a sampled transmit signal;
an analog self-interference canceller, coupled to the transmit coupler, the analog self-interference canceller comprising:
a controller;
a signal divider, that splits the sampled transmit signal into a set of signal components, the set of signal components transmitted by way of a set of transmit paths;
a set of phase shifters, coupled to the set of transmit paths, wherein a phase shifter of the set of phase shifters shifts a signal component of the set of signal components by a total phase shift value;
a set of scalers, coupled to the set of transmit paths, wherein a scaler of the set of scalers scales the signal component by a total scale factor; wherein the scaler comprises a set of scaler stages, each stage having a stage scale factor, the set connected to the scaler by a set of switches; wherein the total scale factor is set by a state configuration of the set of switches and the stage scale factors of the set of scaler stages;
a signal combiner, coupled to the set of transmit paths, that combines the set of signal components into a self-interference cancellation signal; and
a receive coupler, communicatively coupled to a receive signal of the full duplex wireless transceiver, that combines the self-interference cancellation signal with the receive signal to remove at least a first portion of self-interference present in the receive signal.
11. The system of claim 10, wherein the controller generates the state configuration.
12. The system of claim 11, wherein the controller generates the state configuration by computing a desired scaler output of the scaler and selecting the state configuration resulting in a closest total scale factor to the desired scaler output.
13. The system of claim 12, wherein the state configuration is selected from a set of state configurations determined according to a hybrid thermometer code.
14. The system of claim 13, wherein each stage scale factor is predetermined such that the set of state configurations forms a piecewise linear approximation of a scaling curve.
15. The system of claim 13, wherein the set of scaler stages comprises a subset of coarse scaler stages and a subset of fine scaler stages; wherein the subset of coarse scaler stages corresponds to a binary component of the hybrid thermometer code; wherein the subset of fine scaler stages corresponds to a thermometer component of the hybrid thermometer code.
16. The system of claim 11, wherein the controller generates the state configuration by incrementing the state configuration according to a hybrid thermometer code.
17. The system of claim 16, wherein each stage scale factor is predetermined such that incrementing the state configuration the set of state configurations results in total scale factors approximating a piecewise linear approximation of a scaling curve.
18. The system of claim 11, wherein each phase shift stage comprises a resistive attenuator.