CN-116614146-B - Device, method and chip for detecting and suppressing power line communication narrowband interference

CN116614146BCN 116614146 BCN116614146 BCN 116614146BCN-116614146-B

Abstract

The embodiment of the disclosure discloses a device, a method and a chip for detecting and suppressing narrowband interference of power line communication, and relates to the technical field of power line communication. The device comprises a narrowband detection and suppression unit, a main control unit, a narrowband interference suppression unit, a first detection result, a second detection result, a narrowband detection and suppression unit and a narrowband interference disappearance determination unit, wherein the narrowband detection and suppression unit acquires OFDM signals and synchronization state information, the OFDM signals are detected in a parallel mode and sent to the main control unit when the current state of a channel is determined to be an idle state based on the synchronization state information, the narrowband interference suppression unit is used for performing narrowband interference suppression and detecting the suppressed OFDM signals in response to the fact that the working mode is switched to a serial mode, the main control unit is used for receiving the first detection result and the second detection result, the narrowband detection and suppression unit is switched to the serial mode when the narrowband interference is determined to exist based on the first detection result, and the narrowband interference disappearance determination unit is used for determining whether the narrowband interference disappears or not based on the second detection result. Accurate detection and suppression of narrowband interference is achieved through a simple device with low performance requirements.

Inventors

ZHOU CHUNLIANG
WANG LIANCHENG
CHI HAIMING
LIU BIN
CHEN YONGLI
GAN JIE

Assignees

北京智芯微电子科技有限公司

Dates

Publication Date: 20260512
Application Date: 20230627

Claims (20)

1. The device for detecting and suppressing the power line communication narrowband interference is characterized by comprising a narrowband detection and suppression unit and a main control unit, wherein the narrowband detection and suppression unit comprises at least one narrowband component, and the narrowband component comprises a wave trap and a power calculation unit; The narrowband detection and suppression unit is used for acquiring OFDM signals and synchronous state information, detecting the OFDM signals in a parallel mode to obtain a first detection result when the current state of a channel is determined to be an idle state based on the synchronous state information, transmitting the first detection result to the main control unit, performing narrowband interference suppression in the serial mode in response to the working mode being switched to the serial mode, and detecting the suppressed OFDM signals to obtain a second detection result; the main control unit is used for receiving the first detection result, determining whether narrowband interference exists based on the first detection result, switching the working mode of the narrowband detection and suppression unit into a series mode in response to the existence of narrowband interference, and receiving the second detection result; the main control unit is used for receiving a plurality of first detection results from at least one narrow-band component, determining a plurality of interference signal-to-noise ratios based on a preset first formula according to the plurality of first detection results, determining a preset number of target interference signal-to-noise ratios from the plurality of interference signal-to-noise ratios, determining that narrow-band interference exists in response to the target interference signal-to-noise ratio being smaller than a preset interference signal-to-noise ratio threshold, or determining standard deviation corresponding to the preset number of target interference signal-to-noise ratios in response to the target interference signal-to-noise ratio being larger than or equal to the interference signal-to-noise ratio threshold, and determining that narrow-band interference exists in response to the standard deviation being larger than a preset interference signal-to-noise ratio standard deviation threshold.
2. The apparatus of claim 1, wherein the master control unit is further configured to configure a plurality of detection parameter sets for the narrowband detection and suppression unit based on an operating frequency band of the narrowband detection and suppression unit, the detection parameter sets including narrowband center frequency points, notch bandwidths, and power calculation lengths, wherein the narrowband center frequency points are different from each other, and the narrowband center frequency points cover the operating frequency band.
3. The apparatus of claim 2, wherein the device comprises a plurality of sensors, In the parallel mode, a first end of the trap in the narrow-band assembly is connected with an input end of the narrow-band detection and suppression unit, a second end of the trap is connected with a second end of the power calculation unit in the narrow-band assembly, and a first end of the power calculation unit is connected with a first end of the trap; In the series mode, a first end of the trap in the narrowband component is connected with a first input end and a first end of the power calculation unit in the narrowband component, respectively, and a second end of the trap is connected with a second output end and a second end of the power calculation unit, respectively.
4. The apparatus of claim 3, wherein when the narrowband detection and rejection unit comprises a narrowband component, the first input is an input of the narrowband detection and rejection unit and the second output is an output of the narrowband detection and rejection unit.
5. The apparatus of claim 3, wherein the narrowband detection and rejection unit comprises a plurality of narrowband components and the first input is an input of the narrowband detection and rejection unit and the second output is a first end of a first trap in a first narrowband component or the second output is an output of the narrowband detection and rejection unit when the narrowband component is located at a head of the plurality of narrowband components, wherein the first narrowband component is located after the narrowband component and no other narrowband component is located between the first narrowband component and the narrowband component.
6. The apparatus of claim 3, wherein the narrowband detection and rejection unit comprises a plurality of narrowband components and the narrowband component is located in the middle of the plurality of narrowband components, the first input is a second end of a second trap in a second narrowband component or the first input is an input of the narrowband detection and rejection unit, the second output is a first end of a first trap in a first narrowband component or the second output is an output of the narrowband detection and rejection unit, wherein the second narrowband component is located before the narrowband component, the first narrowband component is located after the narrowband component, and no other narrowband components are located between the first narrowband component and the narrowband component and between the second narrowband component and the narrowband component.
7. The apparatus of claim 3, wherein the narrowband detection and rejection unit comprises a plurality of narrowband components and the first input is a second end of a second trap in a second narrowband component or the first input is an input of the narrowband detection and rejection unit and the second output is an output of the narrowband detection and rejection unit when the narrowband component is at an end of the plurality of narrowband components, wherein the second narrowband component is located before the narrowband component and no other narrowband component is located between the second narrowband component and the narrowband component.
8. A device according to claim 3, wherein the strap assembly is adapted to Acquiring at least one of the detection parameter sets in parallel mode; Determining a first signal power corresponding to a received OFDM signal when the received OFDM signal is input to a first end of a wave trap in the narrowband component and a second signal power corresponding to the OFDM signal when the received OFDM signal is output to a second end of the wave trap based on the detection parameter set; Generating the first detection result based on the first signal power and the second signal power; And sending at least one first detection result to the main control unit.
9. The device according to claim 1, wherein the main control unit is configured to In response to the existence of narrowband interference, determining a target narrowband center frequency point corresponding to a target interference signal-to-noise ratio with a value smaller than the interference signal-to-noise ratio threshold, or determining two target interference signal-to-noise ratios with the minimum values from a preset number of target interference signal-to-noise ratios, Determining a target narrowband center frequency point corresponding to the target interference signal-to-noise ratio with the minimum value; Determining target narrowband components from the at least one narrowband component based on the number of target narrowband center frequency points, wherein the number of target narrowband components is less than or equal to the number of target narrowband center frequency points, and the target narrowband components are positioned at the front end of the at least one narrowband component; and switching the working mode of the target narrowband component into a series mode.
10. The apparatus of claim 9, wherein the target narrowband component is configured to Determining a first target signal power corresponding to an OFDM signal received under the target narrowband center frequency point when the OFDM signal is input to a first end of a target trap in the target narrowband component and a second target signal power corresponding to the OFDM signal when the OFDM signal is output to a second end of the target trap in the target narrowband component in a series mode; generating a second detection result based on the first target signal power and the second target signal power; and sending the second detection result to the main control unit.
11. The apparatus of claim 10, wherein the master control unit is configured to Receiving the second detection result of the target narrowband component; Determining a target interference signal-to-noise ratio based on the second detection result and the first formula; and determining that the narrow-band interference under the target narrow-band center frequency point disappears in response to the target interference signal-to-noise ratio being greater than the sum of the interference signal-to-noise ratio threshold and a preset interference signal-to-noise ratio allowance.
12. The apparatus of claim 11, wherein the master control unit is further configured to And switching the working mode of the target narrowband component sending the second detection result into a parallel mode in response to the disappearance of the narrowband interference.
13. The apparatus according to any one of claims 1 to 12, further comprising: and a transmitting unit for generating and transmitting an OFDM signal based on the original data.
14. The apparatus of claim 13, wherein the apparatus further comprises: and the analog front end unit is positioned behind the transmitting unit and is used for carrying out signal amplification, filtering and analog-to-digital conversion processing on the received OFDM signal.
15. The apparatus of claim 14, wherein the apparatus further comprises: And the automatic gain control unit is positioned behind the analog front end unit and is used for adjusting the gain of the analog front end unit so as to enable the amplitude of the OFDM signal input into the automatic gain control unit to fall within a preset demodulation range.
16. The apparatus of claim 15, wherein the apparatus further comprises: the digital band-pass filter is positioned behind the automatic gain control unit and is used for determining the first power corresponding to the received OFDM signal when the OFDM signal is input into the digital band-pass filter and the second power corresponding to the OFDM signal when the OFDM signal is output out of the digital band-pass filter; and sending a first mode switching instruction to the automatic gain control unit in response to the difference value between the first power and the second power being greater than or equal to a preset power difference threshold, wherein the first mode switching instruction is used for indicating to switch the working mode into a slow mode.
17. The apparatus of claim 15, wherein the narrowband detection and rejection unit is further configured to send a first mode switch instruction to the automatic gain control unit in response to the operating mode being switched to a series mode, the first mode switch instruction being configured to instruct the operating mode to be switched to a slow mode; and in response to the working mode not being switched to the series mode, sending a second mode switching instruction to the automatic gain control unit, wherein the second mode switching instruction is used for indicating to switch the working mode to the normal mode.
18. The apparatus of claim 17, wherein the apparatus further comprises: And the synchronization unit is positioned behind the narrow-band detection and suppression unit and is used for determining the current synchronization state of the synchronization unit based on the analysis of the received OFDM signal, and transmitting the synchronization state information to the narrow-band detection and suppression unit based on the current synchronization state.
19. The apparatus of claim 18, wherein the synchronization unit is further configured to send a third mode switching instruction to the automatic gain control unit in response to the synchronization state being an initial frame synchronization state, the third mode switching instruction being configured to instruct switching of an operation mode to a stop mode.
20. The apparatus of claim 19, wherein the apparatus further comprises: And the demodulation decoding unit is positioned behind the synchronization unit and is used for demodulating and decoding the received OFDM signal so as to determine the original data carried in the OFDM signal.

Description

Device, method and chip for detecting and suppressing power line communication narrowband interference Technical Field The disclosure relates to the technical field of power line communication, in particular to a device, a method and a chip for detecting and suppressing narrowband interference of power line communication. Background The power line communication (power line communication, PLC) is a communication mode for transmitting data and media signals by using a power line, and is widely popularized and applied in an electricity consumption information acquisition system due to the advantages of low construction cost, wide coverage range and the like. The power line is designed mainly for the transmission of electrical energy, and when it is used as a communication channel, serious narrowband interference is commonly present in the voltage power line channel. If the narrowband interference intensity is large and the frequency points are large, the performance of the power line communication is seriously affected, so that the narrowband interference in the power line channel needs to be restrained. At present, when detecting and suppressing narrowband interference in a power line channel, it is common to perform time-frequency conversion on a received signal or utilize channel frequency domain response, and then determine whether narrowband interference exists in the frequency domain according to average power and peak power of each frequency point. If the narrowband interference exists, carrying out amplitude limiting and zero setting operations on the narrowband interference points corresponding to the frequency domain, or configuring corresponding wave traps in the time domain. However, in the above method, when narrowband detection and interference are performed by using time-frequency conversion, the hardware device is large and complex if implemented by a hardware device, and the performance of the central processing unit (central processing unit, CPU) is required to be high if implemented by software. When the narrow-band interference detection and suppression are carried out by utilizing the channel frequency domain response, the power line channel has stronger frequency selectivity, so that the decision threshold value of the frequency domain narrow-band is difficult to select when the signal is received, and a certain detection error probability exists. Therefore, how to realize accurate detection and suppression of narrowband interference with a simple device with low performance requirements becomes a technical problem to be solved urgently. Disclosure of Invention In order to solve the problems in the related art, embodiments of the present disclosure provide a device, a method, and a chip for detecting and suppressing narrowband interference of power line communication. In a first aspect, an embodiment of the present disclosure provides a device for detecting and suppressing narrowband interference of power line communication. The power line communication narrowband interference detection and suppression device comprises a narrowband detection and suppression unit and a main control unit; The narrowband detection and suppression unit is used for acquiring an orthogonal frequency division multiplexing (orthogonal frequency division multiplexing, OFDM) signal and synchronous state information, detecting the OFDM signal in a parallel mode to obtain a first detection result when the current state of a channel is determined to be an idle state based on the synchronous state information, transmitting the first detection result to the main control unit, performing narrowband interference suppression in the serial mode in response to the working mode being switched to the serial mode, and detecting the suppressed OFDM signal to obtain a second detection result, and transmitting the second detection result to the main control unit; The main control unit is used for receiving the first detection result, determining whether narrowband interference exists or not based on the first detection result, switching the working mode of the narrowband detection and suppression unit into a series mode in response to the existence of narrowband interference, receiving the second detection result, and determining whether the suppressed narrowband interference disappears or not based on the second detection result. In one implementation manner of the present disclosure, the master control unit is further configured to configure, for the narrowband detection and suppression unit, a plurality of detection parameter sets for the narrowband detection and suppression unit based on an operating frequency band of the narrowband detection and suppression unit, where the detection parameter sets include narrowband center frequency points, notch bandwidths, and power calculation lengths, and the narrowband center frequency points are different from each other, and the narrowband center frequency points cover the operating fr