METHOD AND APPARATUS FOR CANCELING SELF-INTERFERENCE

• US 20160218769A1
• Filed: 01/27/2016
• Published: 07/28/2016
• Est. Priority Date: 01/27/2015
• Status: Active Grant

• Current Assignee: Electronics and Telecommunications Research Institute
• Original Assignee: Electronics and Telecommunications Research Institute
• Inventors: CHANG, Kapseok, KIM, Seon-Ae, JU, Hyung Sik
• Granted Patent: US 10,038,471 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H04B 1/525 with means for reducing leakage of transmitter signal into the receiver
• CPC Class Codes: H04L 5/14 Two-way operation using the same type of signal, i.e. duplex

Abstract

There are provided a method and an apparatus for performing a self-interference cancellation by determining a filter coefficient of an analog filter operated in an analog domain; and canceling self-interference generated in a received signal received by the node by a transmitted signal transmitted from the node, based on the filter coefficient.

Claims

1. A transmitting and receiving node performing a self-interference cancellation, the transmitting and receiving node comprising:

an analog filter operated in an analog domain and canceling self-interference generated in a received signal received by the node, by a transmitted signal transmitted from the node; and

a controller determining a filter coefficient of the analog filter.

2. The transmitting and receiving node of claim 1, wherein:

the transmitted signal is transmitted in a transmitting phase included in a training filed of a time domain, and is not transmitted in an empty phase included in the training field.

3. The transmitting and receiving node of claim 2, wherein:

while a neighboring node of the node is operated in the transmitting phase, the node is operated in the empty phase.

4. The transmitting and receiving node of claim 1, wherein:

the node is operated in an inband full duplex (IFD) scheme or a half duplex (HD) scheme.

5. The transmitting and receiving node of claim 1, wherein:

the analog filter is a finite impulse response (FIR) filter.

6. The transmitting and receiving node of claim 1, wherein:

the controller is operated in a digital domain.

7. The transmitting and receiving node of claim 6, further comprising:

a channel/signal estimator baseband-sampling the transmitted signal and the received signal,

wherein the controller determines the filter coefficient based on the baseband-sampled transmitted signal and the baseband-sampled received signal, and a time delay value received from the analog filter.

8. The transmitting and receiving node of claim 7, wherein:

the channel/signal estimator

baseband-samples the transmitted signal, and then baseband-samples the received signal.

9. The transmitting and receiving node of claim 1, wherein:

the channel/signal estimator

simultaneously baseband-samples the transmitted signal and the received signal.

10. The transmitting and receiving node of claim 1, further comprising:

a distributor transmitting the transmitted signal generated from a transmit module of the node to an antenna, transmitting the received signal received through the antenna to a receive module of the node, and inputting a self-interference signal by the self-interference to the analog filter.

11. A method for canceling self-interference of a transmitting and receiving node, the method comprising:

determining a filter coefficient of an analog filter operated in an analog domain; and

canceling self-interference generated in a received signal received by the node by a transmitted signal transmitted from the node, based on the filter coefficient.

12. The method of claim 11, wherein:

the transmitted signal is transmitted in a transmitting phase included in a training filed of a time domain, and is not transmitted in an empty phase included in the training field.

13. The method of claim 12, wherein:

while a neighboring node of the node is operated in the transmitting phase, the node is operated in the empty phase.

14. The method of claim 11, wherein:

the node is operated in an inband full duplex (IFD) scheme or a half duplex (HD) scheme.

15. The method of claim 11, wherein:

the analog filter is a finite impulse response (FIR) filter.

16. The method of claim 11, wherein:

the determining of the filter coefficient of the analog filter is performed in a digital domain by a controller of the node.

17. The method of claim 16, further comprising:

baseband-sampling the transmitted signal and the received signal,

wherein the determining of the filter coefficient of the analog filter includes;

determining the filter coefficient based on the baseband-sampled transmitted signal and the baseband-sampled received signal, and a time delay value received from the analog filter.

18. The method of claim 17, wherein:

the baseband-sampling of the transmitted signal and the received signal includes

baseband-sampling the transmitted signal, and then baseband-sampling the received signal.

19. The method of claim 17, wherein:

the baseband-sampling of the transmitted signal and the received signal includes

simultaneously baseband-sampling the transmitted signal and the received signal.

20. The method of claim 11, further comprising:

transmitting the transmitted signal generated from a transmit module of the node to an antenna, transmitting the received signal received through the antenna to a receive module of the node, and inputting a self-interference signal by the self-interference to the analog filter.