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Power line carrier communication modulation-demodulation method

A power line carrier and modulation method technology, applied in the field of modulation and demodulation, can solve the problems of increasing power consumption, lowering the voltage of the power supply, affecting performance, etc., and achieving the effect of high energy efficiency ratio

Active Publication Date: 2013-02-06
SHENZHEN NEOTECWAY ELECTRONICS TECH CO LTD
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AI Technical Summary

Problems solved by technology

These modulation methods require continuous transmission of carrier waves. When the power line load is heavy, it will cause increased power consumption. If the power reserve power is insufficient, it will even lower the power supply voltage.
In addition, BPSK or BFSK will produce large distortion at the moment of switching between 0 and 1, which will affect performance

Method used

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  • Power line carrier communication modulation-demodulation method

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Embodiment Construction

[0021] This embodiment is based on a reliable power frequency zero-crossing point detection mechanism, using a series of fundamental frequency pulses as a carrier signal, and the position of this signal relative to the zero-crossing point expresses data information. The receiver detects the signal strength of the fundamental frequency in the zero-crossing interval, and restores the data signal according to the position where the maximum value of the signal strength appears.

[0022] Key points of this embodiment are explained:

[0023] 1. The zero-crossing point of power frequency is used as the time reference for modulation and demodulation. The higher the data transmission rate, the higher the accuracy of zero-crossing detection is required. When the rate is not high, the optocoupler coupling method can be used to detect the power frequency zero-crossing point, and the circuit is simple.

[0024] 2. For a period of time (a time slot) centered on the zero crossing point Eq...

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Abstract

The invention provides a power line carrier communication modulation-demodulation method which is based on a power frequency zero crossing point detection mechanism, uses a string of fundamental frequency pulse to serve as carrier signals, and expresses data information by using positions of the carrier signals relative to a zero crossing point. A demodulation mode of the power line carrier communication modulation-demodulation method is a pulse position demodulation mode based on pulse ceiling capacity detection, and whole effects are superior to binary phase shift keying (BPSK) or binary frequency shift keying (BFSK). The transmission energy efficiency ratio of the power line carrier communication modulation-demodulation method is n times of the BPSK or the BFSK, namely only 1 / n energy consumption is needed for transmitting n-bit data. High energy efficiency ratio means energy saving and environmental protection When power line carriers are popularized and applied in mass.

Description

technical field [0001] The invention relates to the field of power line carrier communication, in particular to a modulation and demodulation method used when data is sent at the power frequency zero-crossing point. Background technique [0002] Power line carrier communication is a communication method in which high-frequency carrier signals transmit information through high-voltage or low-voltage power lines. It is a common method to use the power frequency zero-crossing point for power line carrier transmission. The main advantage is that the switching noise of the zero-crossing point is less. However, traditional BFSK or BPSK / QPSK modulation methods are generally used in power line carrier communication at present. These modulation methods require continuous transmission of carrier waves. When the power line load is heavy, it will cause increased power consumption. If the power reserve power is insufficient, the power supply voltage will even be lowered. In addition, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B3/54
Inventor 祝文闻梁深
Owner SHENZHEN NEOTECWAY ELECTRONICS TECH CO LTD
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