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Automatic gain control method based on depth saturation impulse noise

A technology of automatic gain control and impulse noise, applied in gearbox control/balance, line transmission monitoring/testing, line transmission components, etc. Consider issues such as large pulse noise to achieve the effects of reducing adverse effects, increasing speed, and improving output SNR

Pending Publication Date: 2022-07-12
CHONGQING UNIV OF POSTS & TELECOMM
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  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, the biggest disadvantage of OFDM technology is that the peak-to-average signal power is relatively large, generally 10-12dB. When the average power of the useful signal is small, the peak value of the signal has exceeded the full scale of the ADC, resulting in truncation and distortion of the useful signal and reducing the demodulation at the receiving end. performance
Traditional AGC mainly considers signal fluctuations caused by large-scale fading and near-far effects in communication. It focuses on the gain adjustment range and adjustment accuracy of AGC. It does not consider the scenario where large pulse noise is far greater than the useful signal, nor does it consider to the burstiness of impulse noise, so it is not suitable for introducing into PLC system

Method used

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  • Automatic gain control method based on depth saturation impulse noise
  • Automatic gain control method based on depth saturation impulse noise
  • Automatic gain control method based on depth saturation impulse noise

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0084] Example 1: Normal mode AGC function test

[0085] The embodiments of improving AGC are divided into two cases: normal mode and pulse suppression mode. In normal mode, if the situation is ideal, the AGC can be adjusted in place by a look-up table in one step.

[0086] The improved AGC enters the normal mode when no pulse noise is detected. There is no pulse in the PLC for most of the time, so the normal mode AGC occupies the main time. In the normal mode, the AGC is also divided into two cases: compression and amplification. AGC test in normal mode It is relatively simple and due to space reasons, the following only tests the scene where AGC compresses large signals. There is no interference of impulse noise in normal mode. Therefore, only the signal source is used to transmit useful signals to test the AGC performance. The results are as follows: Figure 4 shown.

[0087] Depend on Figure 4 It can be seen that the useful signal Vpp is 2.5V before the AGC adjustment. ...

Embodiment 2

[0088] Example 2: Suppressed Pulse Mode AGC Functional Test

[0089] The improved AGC enters the suppression pulse mode when it detects pulse noise. Due to the uncontrollability of the arrival time and noise amplitude of the impulse noise in PLC, in accordance with the requirements of anti-impulse noise performance in the PLC communication performance test standard, this paper uses square wave pulses to superimpose useful signals to test the pulse suppression performance, and the square wave pulse frequency is 100kHz. , the pulse width is 1μs, and the Vpp is 4V. The test block diagram of the improved AGC pulse suppression performance is as follows Figure 5 shown.

[0090] Figure 5 The transmitting equipment in the middle transmits useful signals, the front end of the receiving equipment has an AGC circuit, and the shielding box suppresses external noise. In order to avoid the impact of impulse noise in the power frequency grid, a 12V battery is used to enter the shielding...

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Abstract

The invention relates to an automatic gain control method based on deep saturation impulse noise, and belongs to the field of power line communication. The method comprises the following steps: S1, sampling a VGA output signal, and obtaining a sampling signal through an ADC; s2, detecting whether the ADC sampling signal has a saturated sampling point, namely judging an ADC overflow flag bit, if the ADC overflow flag bit is 0, not executing the pulse noise detection module, and entering a normal AGC mode; s3, if the ADC overflow flag bit is 1, executing a pulse noise detection module; and S4, if the ADC overflow mark is 1, but no pulse noise is detected, entering a normal AGC gain adjustment mode, and adopting a normal AGC mode gain adjustment algorithm in the adjustment process. According to the method, the signal power estimation speed is increased, the convergence is extremely good, the loop stabilization time is ensured to be as short as possible, and meanwhile, the signal power estimation accuracy is also relatively high.

Description

technical field [0001] The invention belongs to the field of power line communication, and relates to the aspect of PLC impulse noise suppression. Specifically, it relates to an automatic gain control method based on deep saturated impulse noise. Background technique [0002] Power Line Communication (PLC) refers to a communication technology that uses 220V power lines and the transmission network and distribution network formed by them as a communication medium to realize data transmission. The early applications of PLC were mainly narrow-band voice and data communication on medium and high voltage power lines. At this time, the PLC frequency was low and it worked at the kHz level. The application fields were limited to power supply management, remote control, and remote protection. [0003] With the development of technology, PLC has attracted more and more attention from scholars because of its unique advantages. The biggest advantage of power line communication is that ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B3/46H04B3/04H04B3/54
CPCH04B3/46H04B3/04H04B3/54Y02B90/20
Inventor 周立鹏张洋周健毛翔宇
Owner CHONGQING UNIV OF POSTS & TELECOMM