Control method of automatic gain in power line carrier communication network

Abstract

The invention discloses a control method of an automatic gain in a power line carrier communication network, and belongs to the technical field of power line carriers. The control method relates to a front end low noise amplifier, an active band-pass filter, a programmable gain amplifier, an analog-digital conversion unit and an automatic gain control unit. The method comprises the steps that an input carrier signal passes through the front end low noise amplifier, lower noise amplification is conducted on the input signal firstly, and after band-pass filtering, the carrier signal with a high signal-to-noise ratio is obtained; the carrier signal is amplified through the programmable gain amplifier, an initial gain value of the programmable gain amplifier is set to be the maximum value in a preset reference range, analog-digital conversion is conducted on the input carrier signal after the input carrier signal is amplified, sampling is conducted on the converted carrier signal, and median filtering is conducted on an obtained sampling signal to obtain average intensity of the carrier signal; and the gain of the programmable gain amplifier can be adjusted according to a difference between the average intensity of the carrier signal and the preset reference range.

Description

technical field [0001] The invention relates to an automatic gain control method in a power carrier communication network, belonging to the technical field of power carrier. Background technique [0002] In the power line communication system, when the carrier signal is transmitted, due to the randomness of the installation distance of the communication node, the randomness of the attenuation of the power line, and the random change of the load of the power line, the strength of the carrier signal received from the outside will change in real time. , which makes the carrier signal level received by the receiving end change in real time, and the stability of the carrier signal level directly affects the transmission quality of the carrier communication system. In the prior art, when detecting a real-time carrier signal, when a carrier signal is detected to be transmitted on the power line, the power line communication device will transfer to the transmission and processing of...

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Problems solved by technology

[0003] In order to overcome the deficiencies of the prior art, the present invention provides an automatic gain control method in a power carrier communication network, the purpose of which is to solve the unreliable carrier communication on the power line when the carrier signal in the power line carrier communication is too strong or weak, The real-time communication rate of the signal is not high

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