METHOD OF IN-BAND FULL-DUPLEX MULTIPLE-INPUT MULTIPLE-OUTPUT TRANSMISSION AND RECEPTION, AND APPARATUS FOR THE SAME

• US 20180076847A1
• Filed: 09/07/2017
• Published: 03/15/2018
• Est. Priority Date: 09/13/2016
• Status: Active Grant

• Current Assignee: Electronics and Telecommunications Research Institute
• Original Assignee: Electronics and Telecommunications Research Institute
• Inventors: JU, Hyung Sik, GWAK, Dong Hyuk, KIM, Seon Ae, LEE, Yu Ro, LEE, Hyun
• Granted Patent: US 10,432,250 B2
• Time in Patent Office: Days
• CPC Class Codes: H04B 1/525 with means for reducing leakage of transmitter signal into the receiver
• CPC Class Codes: H04B 7/0413 MIMO systems
• CPC Class Codes: H04L 25/022 of frequency response
• CPC Class Codes: H04L 25/0224 using sounding signals
• CPC Class Codes: H04L 25/0328 with interference cancellation circuitry adaptations for interference cancellation within a sequence estimator H04L25/03305; interference related aspects of direct sequence spread spectrum H04B1/7097; interference related aspects of frequency hopping spread spectrum H04B1/715; see also H04B1/10
• CPC Class Codes: H04L 5/0023 Time-frequency-space
• CPC Class Codes: H04L 5/14 Two-way operation using the same type of signal, i.e. duplex
• CPC Class Codes: H04L 5/16 Half-duplex systems; Simplex/duplex switching; Transmission of break signals non-automatically inverting the direction of transmission

Abstract

An operation method of an in-band full duplex (IFD) multiple-input multiple-output (MIMO) transceiver, including a reception part, a transmission part, an analog self-interference (SI) generator, and a self-interference cancellation (SIC) controller, may comprise generating, at the SIC controller, a control signal for analog SIC and digital SIC and outputting the control signal to the reception part and the analog SI generator; cancelling, at the SIC controller, SI of a transmission signal of the transmission part based on the control signal; and cancelling, at the reception part, SI of a signal of the reception part based on the control signal.

Claims

1. An operation method of an in-band full duplex (IFD) multiple-input multiple-output (MIMO) transceiver including a reception part, a transmission part, an analog self-interference (SI) generator, and a self-interference cancellation (SIC) controller, the operation method comprising:

generating, at the SIC controller, a control signal for analog SIC and digital SIC and outputting the control signal to the reception part and the analog SI generator;

cancelling, at the SIC controller, SI of a transmission signal of the transmission part based on the control signal; and

cancelling, at the reception part, SI of a signal of the reception part based on the control signal.

2. The operation method according to claim 1, wherein the control signal is generated based on an output signal of the analog SI generator and an output signal of a reception (RX) analog-to-digital converter (ADC) in the reception part.

3. The operation method according to claim 1, further comprising, before the generating a control signal, generating, at a baseband MIMO transmitter in the transmission part, a signal for transmission signal forming by oversampling the transmission signal of the transmission part, and outputting the signal for transmission signal forming to the SIC controller.

4. The operation method according to claim 3, wherein the cancelling at the SIC controller further comprises forming, at the SIC controller, the transmission signal of the transmission part and outputting the formed transmission signal to a transmission (TX) digital-to-analog converter (DAC) in the transmission part.

5. The operation method according to claim 1, wherein the SIC controller outputs the control signal to a digital SI canceller in the reception part.

6. The operation method according to claim 5, wherein the digital SI canceller cancels SI from the signal of the reception part based on the control signal.

7. The operation method according to claim 6, further comprising outputting, at the digital SI canceller, the signal of the reception part from which the SI has been cancelled to a baseband MIMO receiver in the reception part.

8. An operation method of a self-interference cancellation (SIC) controller in an in-band full duplex (IFD) multiple-input multiple-output (MIMO) transceiver, comprising:

generating, at a basis generator of the SIC controller, a basis for estimating linear and non-linear components of SI based on an output signal of a transmission part of the IFD MIMO transceiver and an output signal of a reception part of the IFD MIMO transceiver;

estimating, at a transmission signal former of the SIC controller, coefficients for transmission signal forming based on the basis, the output signal of the transmission part, and the output signal of the reception part;

forming, at the transmission signal former of the SIC controller, a transmission signal based on the coefficients; and

estimating, at a digital self-interference (SI) generator of the SIC controller, a digital SI channel based on the basis, the output signal of the transmission part, and the output signal of the reception part.

9. The operation method according to claim 8, wherein the basis generator generates the basis based on an output signal of a reception (RX) analog-to-digital converter (ADC) in the reception part and an output signal of a baseband MIMO transmitter in the transmission part.

10. The operation method according to claim 8, wherein the transmission signal former estimates the coefficients based on at least one of an output signal of a reception (RX) analog-to-digital converter (ADC) in the reception part and an output signal of a baseband MIMO transmitter in the transmission part.

11. The operation method according to claim 10, wherein the transmission signal former linearizes the transmission signal based on the output signal of the baseband MIMO transmitter of the transmission part and the coefficients, and outputs the linearized transmission signal to the transmission part.

12. The operation method according to claim 8, wherein the digital SI generator estimates the digital SI channel based on the basis and an output signal of a reception (RX) analog-to-digital converter (ADC) in the reception part.

13. The operation method according to claim 12, wherein the digital SI generator regenerates a digital SI based on the digital SI channel and the basis.

14. The operation method according to claim 8, further comprising generating, at an analog SI coefficient generator of the SIC controller, a control signal for controlling an analog SI generator based on one of the output signal of the reception part and the output signal of the transmission part.

15. A self-interference cancellation (SIC) method in an in-band full duplex (IFD) multiple-input multiple-output (MIMO) transceiver including an antenna part, a reception part, a transmission part, and a SIC controller, the SIC method comprising:

estimating, at the SIC controller, parameters for SIC of a transmission signal during a training interval;

estimating, at the SIC controller, a digital self-interference (DSI) channel during the training interval; and

cancelling, at the SIC controller, SI of a signal of the transmission part and a signal of the reception part based on the parameters during a data transmission interval.

16. The SIC method according to claim 15, wherein the parameters include finite impulse response (FIR) filter coefficients for analog SIC, coefficients for transmission signal forming, and the DSI channel.

17. The SIC method according to claim 15, wherein the training interval includes a preamble field, an analog SIC training field, a transmission signal forming training field, a digital SIC training field, and a reserved field.

18. The SIC method according to claim 15, wherein, in the training interval, the SIC controller generates a first basis for the estimation of the parameters and a second basis for the estimation of the DSI channel.

19. The SIC method according to claim 15, wherein, in the training interval, the SIC controller forms the transmission signal based on the parameters and outputs the formed transmission signal to the reception part and the transmission part.

20. The SIC method according to claim 15, wherein the training interval includes first to third training fields, a signal is transmitted through a first antenna of the antenna part during the first training field, a signal is transmitted through a second antenna of the antenna part during the second training field, a signal is transmitted through the first antenna and the second antenna during the third training field, the first and second training fields use an arbitrary signal as a pilot signal, and the third training field uses a random signal as a pilot signal.