Circuits and methods for performing self-interference cancelation in full-duplex transceivers

• US 9,887,862 B2
• Filed: 12/27/2016
• Issued: 02/06/2018
• Est. Priority Date: 12/07/2015
• Status: Active Grant

• Current Assignee: Trustees Of Columbia University In The City Of New York (Columbia University)
• Original Assignee: Trustees Of Columbia University In The City Of New York (Columbia University)
• Inventors: Zhou, Jin, Krishnaswamy, Harish
• Primary Examiner(s): Guarino, Rahel
• Application Number:
  US15/391,292
• Publication Number:
  US 20170170999A1
• Time in Patent Office: 406 Days
• Field of Search: 375219, 370278, 370276, 370282, 455 631, 455296, 455501, 455 83
• CPC Class Codes: H04B 1/123 using adaptive balancing or compensation means adaptive filter circuits and algorithms H03H
• CPC Class Codes: H04B 1/525 with means for reducing leakage of transmitter signal into the receiver
• CPC Class Codes: H04L 25/08 Modifications for reducing interference; Modifications for reducing effects due to line faults ; Receiver end arrangements for detecting or overcoming line faults
• CPC Class Codes: H04L 5/1461 Suppression of signals in the return path, i.e. bidirectional control circuits

Abstract

Full duplex transceivers are provided, the transceivers comprising: a transmitter section that includes an analog portion having analog baseband signals and a digital portion having digital baseband signals; a receiver section that includes an analog portion having analog baseband signals and a digital portion having digital baseband signals; an analog self-interference canceller that, in response to the analog baseband signals in the analog portion of the transmitter section, produces analog cancellation signals that cancel first self-interference in the analog baseband signals in the analog portion of the receiver section; and a digital self-interference canceller that, in response to the digital baseband signals in the digital portion of the transmitter section, produces digital cancellation signals that cancel second self-interference in the digital baseband signals in the digital portion of the receiver section.

Claims

1. A full duplex transceiver comprising:

a transmitter section that includes an analog portion having analog baseband signals and a digital portion having digital baseband signals;

a receiver section that includes an analog portion having analog baseband signals and a digital portion having digital baseband signals;

an analog self-interference canceller that, in response to the analog baseband signals in the analog portion of the transmitter section, produces analog cancellation signals that cancel first self-interference in the analog baseband signals in the analog portion of the receiver section; and

a digital self-interference canceller that, in response to the digital baseband signals in the digital portion of the transmitter section, produces digital cancellation signals that cancel second self-interference in the digital baseband signals in the digital portion of the receiver section, wherein the digital self-interference canceller performs a non-linear tapped delay line function on the digital baseband signals in the digital portion of the transmitter section to produce the digital cancellation signals.

2. The full duplex transceiver of claim 1, wherein the transmitter section comprises a digital-to-analog converter that separates the digital portion of the transmitter section from the analog portion of the transmitter section.

3. The full duplex transceiver of claim 1, wherein the receiver section comprises an analog-to-digital converter that separates the analog portion of the receiver section from the digital portion of the receiver section.

4. The full duplex transceiver of claim 1, wherein the non-linear tapped delay line function is:

6. The full duplex transceiver of claim 1, where an output of the transmitter section and an input of the receiver section are connected to an antenna interface that is also connected to an antenna that transmits signals from the transmitter section and receives signals provided to the receiver section.

7. The full duplex transceiver of claim 6, wherein the antenna interface is a non-reciprocal circulator.

8. The full duplex transceiver of claim 6, wherein the antenna interface is an electrical balance duplexer.

5. A full duplex transceiver comprising:

a transmitter section that includes an analog portion having analog baseband signals and a digital portion having digital baseband signals;

a receiver section that includes an analog portion having analog baseband signals and a digital portion having digital baseband signals;

an analog self-interference canceller that, in response to the analog baseband signals in the analog portion of the transmitter section, produces analog cancellation signals that cancel first self-interference in the analog baseband signals in the analog portion of the receiver section, wherein the analog self-interference canceller performs amplitude and phase scaling on the analog baseband signals in the analog portion of the transmitter section to produces analog cancellation signals; and

a digital self-interference canceller that, in response to the digital baseband signals in the digital portion of the transmitter section, produces digital cancellation signals that cancel second self-interference in the digital baseband signals in the digital portion of the receiver section.

9. The full duplex transceiver of claim 5, wherein the transmitter section comprises a digital-to-analog converter that separates the digital portion of the transmitter section from the analog portion of the transmitter section.

10. The full duplex transceiver of claim 5, wherein the receiver section comprises an analog-to-digital converter that separates the analog portion of the receiver section from the digital portion of the receiver section.

11. The full duplex transceiver of claim 5, where an output of the transmitter section and an input of the receiver section are connected to an antenna interface that is also connected to an antenna that transmits signals from the transmitter section and receives signals provided to the receiver section.

12. The full duplex transceiver of claim 11, wherein the antenna interface is a non-reciprocal circulator.

13. The full duplex transceiver of claim 11, wherein the antenna interface is an electrical balance duplexer.