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Low-voltage power line carrier communication method

A low-voltage power line and carrier communication technology, which is applied in the field of communication, can solve problems such as large time-varying attenuation, complex interference noise, and high signal-to-noise ratio requirements, and achieve anti-burst interference, high transmission reliability, and low computational complexity. Effect

Inactive Publication Date: 2015-01-14
NO 722 RES INST OF CHINA SHIPBUILDING IND
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  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Since the low-voltage power line is laid for the transmission of electric energy, its transmission characteristics are often difficult to meet the requirements of data communication, and it has the characteristics of large time-varying attenuation and complex interference noise.
my country's power grid has no strict restrictions on the electromagnetic compatibility indicators of electrical equipment, and the line noise is large. It is difficult for foreign mature power line carrier communication chips to meet domestic applications. The main reason is that the receiving sensitivity indicators do not meet the requirements.
The power line carrier communication technology commonly used in China mostly uses uncoded and interleaved FSK modulation methods, which have high requirements for signal-to-noise ratio and weak anti-burst error capability

Method used

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Embodiment Construction

[0016] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0017] This embodiment provides a low-voltage power line carrier communication method, including the following steps.

[0018] Step 1, the transmitting end adopts the continuous phase FSK modulation method to obtain the mark frequency , Empty number frequency The signal, and the signal is sent to the receiving end through the channel after the digital-to-analog converter.

[0019] FSK (Frequency-shift keying), that is, frequency-shift keying, is the most commonly used modulation method in power line narrowband modulation. Because the FSK system is less affected by the amplitude nonlinearity and is easy to implement by software, FSK has been widely used in the power carrier communication system.

[0020] Frequency shift keying is to load the information to be transmitted on the instantaneous frequency change of the carrier, that is, the change of fr...

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Abstract

The invention belongs to the field of communication methods, and particularly relates to a low-voltage power line carrier communication method which supports zero crossing point low-speed reliable transmission and non-zero crossing point high-speed transmission. According to the low-voltage power line carrier communication method, the convolutional code, interleaving and constant envelope FSK technologies are comprehensively utilized, the characteristic that the power line power frequency zero crossing point interference is small is utilized, and the zero crossing point reliable transmission waveform is designed, so that the transmission reliability can be greatly improved, and the non-zero crossing point high-speed transmission can be achieved through conversion when the interference is small.

Description

technical field [0001] The invention belongs to the field of communication methods, in particular to a low-voltage power line carrier communication method supporting zero-crossing low-speed reliable transmission and non-zero-crossing high-speed transmission. Background technique [0002] High-frequency carrier transmission based on low-voltage power lines can realize data communication while transmitting power without additional signal lines, and has a broad market in narrow-band communication applications such as automatic control and automatic power meter reading. [0003] Since the low-voltage power line is laid for the transmission of electric energy, its transmission characteristics are often difficult to meet the requirements of data communication, and it has the characteristics of large time-varying attenuation and complex interference noise. my country's power grid has no strict restrictions on the electromagnetic compatibility indicators of electrical equipment, and...

Claims

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Application Information

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IPC IPC(8): H04B3/54H04L27/10
Inventor 黎德文赵大胜
Owner NO 722 RES INST OF CHINA SHIPBUILDING IND