Electronic system with RFI cancelation mechanism and related RFI cancelation method

Patent metadata

Field	Value
Publication number	US-10791006-B1
Application number	US-202016747488-A
Country	US
Kind code	B1
Filing date	Jan 20, 2020
Priority date	Sep 17, 2019
Publication date	Sep 29, 2020
Grant date	Sep 29, 2020

Abstract

An electronic system includes a feedforward equalizer, a feedback equalizer, an RFI canceler, and a control circuit. The feedforward equalizer and the feedback equalizer are configured to adjust the channel response of a transmission channel in the electronic system. The RFI canceler is configured to cancel the RFI presence in the electronic system. When the RFI canceler is off, the controller is configured to turn on the RFI canceler according to a signal error value before RFI cancelation, an error term of the electronic system, or an SNR of the electronic system.

First claim

What is claimed is:

1. An electronic system with radio-frequency interference (RFI) cancelation mechanism, comprising:
a feedforward equalizer configured to adjust a channel response of a transmission channel in the electronic system and cancel an RFI presence in the electronic system;
a feedback equalizer configured to adjust the channel response of the transmission channel in the electronic system;
an RFI canceler configured to cancel the RFI presence in the electronic system; and
a control circuit configured to:
determine whether the RFI canceler which is currently deactivated should be activated according to a signal error value before RFI cancelation, an error term of the electronic system, or a signal-to-noise ratio (SNR) of the electronic system; and
determine whether the RFI canceler which is currently activated should be deactivated according to a response of the RFI canceler, the signal error value before RFI cancelation, the error term of the electronic system, or the SNR of the electronic system.

2. The electronic system of claim 1 , further comprising:
a first adder, comprising:
a first input end coupled to an output end of the feedforward equalizer;
a second input end coupled to an output end of the feedback equalizer; and
an output end;

a second adder, comprising:
a first input end coupled to an output end of the RFI canceler;
a second input end coupled to an output end of the first adder; and
an output end; and

a slicer, comprising:
an input end coupled to the output end of the second adder; and
an output end coupled to the output end of the feedback equalizer.

3. The electronic system of claim 2 , further comprising:
a first detector configured to provide the response of the RFI canceler or the signal error value before RFI cancelation, and comprising:
a first end coupled between the output end of the first adder and the second input end of the second adder;
a second end coupled to the output end of the slicer; and
an output end coupled to the control circuit; and

a second detector configured to provide the error term of the electronic system or the SNR of the electronic system, and comprising:
a first end coupled the input end of the slicer;
a second end coupled to the output end of the slicer; and
an output end coupled to the control circuit.

4. A method of performing radio-frequency interference (RFI) cancelation, comprising:
a feedforward equalizer in an electronic system adjusting a channel response of a transmission channel in the electronic system and canceling an RFI presence in the electronic system;
a feedback equalizer in the electronic system adjusting the channel response of the transmission channel in the electronic system;
detecting a response of an RFI canceler in the electronic system or a signal error value before RFI cancelation;
detecting an error term or an SNR of the electronic system; and
determining whether the RFI canceler which is currently deactivated should be activated according to the signal error value before RFI cancelation, the error term of the electronic system, or the SNR of the electronic system.

5. The method of claim 4 , further comprising:
activating the RFI canceler which is currently deactivated when determining that the signal error value before RFI cancelation is larger than a first threshold value, the error term of the electronic system is larger than a second threshold value, or the SNR of the electronic system is smaller than a third threshold value.

6. The method of claim 5 , further comprising:
resetting the RFI canceler before activating or deactivating the RFI canceler.

7. The method of claim 4 , further comprising:
determining whether the RFI canceler which is currently activated should be deactivated according to the response of the RFI canceler, the signal error value before RFI cancelation, the error term of the electronic system, or the SNR of the electronic system.

8. The method of claim 7 , further comprising:
continuing to activate the RFI canceler which is currently activated when determining that the response of the RFI canceler is larger than a fourth threshold value, the signal error value before RFI cancelation is larger than a fifth threshold value, the error term of the electronic system is larger than a sixth threshold value, or the SNR of the electronic system is smaller than a seventh threshold value.

9. The method of claim 8 , further comprising:
resetting the RFI canceler before activating or deactivating the RFI canceler.

10. A method of performing RFI cancelation, comprising:
a feedforward equalizer in an electronic system adjusting a channel response of a transmission channel in the electronic system and canceling an RFI presence in the electronic system;
a feedback equalizer in the electronic system adjusting the channel response of the transmission channel in the electronic system;
detecting a response of an RFI canceler in the electronic system or a signal error value before RFI cancelation; and
determining whether the RFI canceler which is currently activated should be deactivated according to the response of the RFI canceler, the signal error value before RFI cancelation, the error term of the electronic system, or the SNR of the electronic system.

11. The method of claim 10 , further comprising:
continuing to activate the RFI canceler which is currently activated when determining that the response of the RFI canceler is larger than a first threshold value, the signal error value before RFI cancelation is larger than a second threshold value, the error term of the electronic system is larger than a third threshold value, or the SNR of the electronic system is smaller than a fourth threshold value.

12. The method of claim 11 , further comprising:
resetting the RFI canceler before activating or deactivating the RFI canceler.

Assignees

• Realtek Semiconductor Corp

Inventors

• Lin Chia-Chang
• Chen Li-Chung
• Su Ching-Yao
• Chu Yuan-Jih

Classifications

• H04L2025/03808

  Transmission of equaliser coefficients · CPC title

• H04L2025/037

  Detection of convergence state · CPC title

• H04L2025/03636

  Algorithms using least mean square [LMS] · CPC title

• H04L25/0307 Primary

  using blind adaptation · CPC title

• H04B1/123

  using adaptive balancing or compensation means (adaptive filter circuits and algorithms H03H) · CPC title