# US 10,873,877 B2 · Interference cancellation methods and apparatus

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- Number: US 10,873,877 B2
- Document ID: US10873877B2
- Status: Granted
- Kind: B2
- Application number: 16/392,204
- Filed: 2019-04-23
- Published: 2019-08-15
- Granted: 2020-12-22
- Earliest claimed: 2016-07-16
- Assignees: GenXComm, Inc.
- Applicants: GenXComm, Inc.
- Inventors: Hardik Jain; Che-Chun Lin
- Web page: https://patentgrep.com/patent/US10873877B2

## CPC

- H04W 28/04: Error control
- H04B 1/525: with means for reducing leakage of transmitter signal into the receiver
- H04B 10/2507: for the reduction or elimination of distortion or dispersion
- H04B 10/25752: {Optical arrangements for wireless networks}
- H04L 25/03006: {Arrangements for removing intersymbol interference}
- H04B 2210/006: Devices for generating or processing an RF signal by optical means
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)
- H04B: TRANSMISSION
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)

## Abstract

Methods and apparatus for reducing and/or canceling signal interference between receiver and transmitter components of a wireless communications device are described. The methods and apparatus are well suited for use in a wide range of devices including user equipment devices such as cell phones as well as in network equipment such a base stations. Opto-mechanical devices are used in some embodiments as part of an apparatus which performs interference cancellation on RF (Radio Frequency) signals.

## Claims

### Claim 1

A method of performing radio frequency (RF) self-interference cancellation comprising:
receiving a first RF signal and a control signal;
producing an acoustic signal carrying the first RF signal;
transducing the acoustic signal onto an optical signal according to the control signal;
transducing the optical signal to an electrical signal; and
combing the electrical signal with a second RF signal to cancel interference by the first RF signal in the second RF signal.

### Claim 2 (depends on 1)

The method of claim 1, wherein transducing the acoustic signal onto an optical signal is performed via phonon-photon transduction.

### Claim 3 (depends on 2)

The method of claim 2, wherein transducing the acoustic signal onto an optical signal performed via phonon-photon transduction is controlled by the control signal comprises modifying at least one of a group consisting of:
a property of a medium through which the acoustic signal travels;
a property of a waveguide through which the acoustic signal travels;
a location of said phono-photon transduction; and
a gain of said phonon-photon transduction.

### Claim 4 (depends on 2)

The method of claim 2, wherein transducing the acoustic signal onto an optical signal performed via phonon-photon transduction is controlled by the control signal.

### Claim 5 (depends on 4)

The method of claim 4, wherein the electrical signal comprises an electrical interference cancellation signal.

### Claim 6 (depends on 5)

The method of claim 5, further comprising:
cancelling interference in the second RF signal by combining the second RF signal with the electrical interference cancellation signal.

### Claim 7 (depends on 6)

The method of claim 6, wherein combining the second RF signal with the electrical interference cancellation signal comprises adding the electrical interference cancellation signal to the second RF signal.

### Claim 8 (depends on 7)

The method of claim 7, wherein combining the second RF signal with of the electrical interference cancellation signal comprises subtracting the electrical interference cancellation signal from the second RF signal.

### Claim 9

A radio frequency (RF) self-interference cancellation apparatus comprising:
a first transducer configured to receive an RF signal and to produce an acoustic signal carrying the RF signal;
a control input configured to receive a control signal for controlling phonon-photon transduction of the acoustic signal to an optical signal;
a waveguide configured to communicate the optical signal;
an optical to electrical converter configured to convert the optical signal to an electrical interference cancellation signal; and
a combiner configured to combine the electrical interference cancellation signal with the RF signal.

### Claim 10 (depends on 9)

The apparatus of claim 9, further comprising:
a heating element positioned controlled by the control signal.

### Claim 11 (depends on 9)

The apparatus of claim 9, further comprising at least one additional transducer oriented differently than the first transducer.