SYSTEMS FOR INTEGRATED SELF-INTERFERENCE CANCELLATION

• US 20170104574A1
• Filed: 09/19/2016
• Published: 04/13/2017
• Est. Priority Date: 10/13/2015
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Kumu Networks, Inc.
• Inventors: Riddle, Alfred, Landi, Ernie, Hahn, Wilhelm Steffen
• Granted Patent: US 9,634,823 B1
• Time in Patent Office: Days
• CPC Class Codes: H01L 2224/73265 Layer and wire connectors
• CPC Class Codes: H04B 1/0475 with means for limiting noise, interference or distortion H04B1/0483 takes precedence
• CPC Class Codes: H04B 1/10 Means associated with receiver for limiting or suppressing noise or interference
• CPC Class Codes: H04B 1/123 using adaptive balancing or compensation means adaptive filter circuits and algorithms H03H
• CPC Class Codes: H04B 1/44 Transmit/receive switching
• CPC Class Codes: H04B 1/525 with means for reducing leakage of transmitter signal into the receiver
• CPC Class Codes: H04B 15/00 Suppression or limitation of noise or interference by means associated with receiver H04B1/10
• CPC Class Codes: H04L 5/14 Two-way operation using the same type of signal, i.e. duplex

Abstract

A system for integrated self-interference cancellation, comprising a transmit coupler, coupled to a transmit signal, that samples the transmit signal to create a sampled transmit signal; an analog self-interference canceller, coupled to the transmit coupler, comprising a controller; a signal divider, that splits the sampled transmit signal into a set of signal components; a set of phase shifters, wherein a phase shifter of the set shifts a signal component of the set of signal components by a total phase shift value; a set of scalers, wherein a scaler of the set scales the signal component by a total scale factor; a signal combiner, that combines the set of signal components into a self-interference cancellation signal; and a receive coupler, coupled to a receive signal, that combines the self-interference cancellation signal with the receive signal to remove a portion of self-interference present in the receive signal.

Claims

7. The system of claim 7, wherein the series of steps is computed according to a phase shift curve, wherein a first subset of the series of steps corresponding to coarse increments along the phase shift curve are computed according to a binary component of the hybrid thermometer code, and wherein a second subset of the series of steps corresponding to fine increments along the phase shift curve are computed according to a thermometer component of the hybrid thermometer code.

14-1. system of claim 14, wherein a first analog integrated circuit, coupled to the substrate, comprises a first scaler of the set of scalers, a first phase shifter of the set of phase shifters, a circuit input, and a circuit output;

wherein the circuit input is coupled to the scaler input, the scaler output is coupled to the phase shifter input, and the phase shifter output is coupled to the circuit output; and

wherein the circuit output is coupled to the signal combiner.

17. The system of claim 16, wherein the first analog integrated circuit further comprises a digital passthrough, the digital passthrough comprising a buffer configured to pass digital control signals between the circuit input and the circuit output.