Carrier Sense Method, Circuit and Microcontroller

Abstract

The present invention provides a method, circuit and microcontroller for carrier sense. The method includes: performing analog amplification on the received analog signal; performing analog to digital conversion on the amplified analog signal to generate a digital signal; demodulating the digital signal to generate a demodulated signal; calculating the energy value of the demodulated signal according to the amplitude value of the demodulated signal; determining a gain multiple according to the energy value of the demodulated signal and a preset energy range; and according to the gain multiple, controlling the amplification multiple which is used when the analog amplification is performed on the received analog signal. The present invention enables the sense on the power line carrier signal which has less energy, and expands the application environment.

Description

technical field [0001] The embodiments of the present invention relate to the field of power line communication, in particular to a carrier sensing method, circuit and microcontroller in power line communication. Background technique [0002] The Carrier Sense Multiple Access (CSMA for short) technology in power line communication senses the carrier to avoid possible conflicts and collisions of signals transmitted between nodes. [0003] An existing CSMA implementation scheme listens to the channel before a certain node sends a signal. If the channel is idle, the node generates a random delay time according to the prediction of the current network load. When the random delay time ends, the channel if is still idle, the node sends the packet. This solution requires complex software algorithms and a large amount of hardware costs, which increases the cost of the product; and with the substantial increase in the number of nodes in the network, the waiting time is very long. ...

AI Technical Summary

Problems solved by technology

This solution requires complex software algorithms and a lot of hardware costs, which increases product costs; and with the substantial increase in the number of nodes in the network, the waiting time is very long

[0004] In addition, because the attenuation of the power line communication is very large, and the energy of the input carrier signal cannot be set at the same time, it is not suitable for the carrier with small energy. In the application of power line carrier meter reading, the voltage of the meter reading signal is usually low, so the carrier energy Also low, it is difficult to achieve accurate carrier sensing through existing methods

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