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Power line carrier communication method based on frequency domain processing

A power line carrier and power line technology, which is applied in the field of power line carrier communication based on frequency domain processing to achieve the effects of low cost, simple method and reliable transmission

Active Publication Date: 2018-06-15
深圳市力合微电子股份有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] In order to solve the problems existing in the power line carrier communication system in the prior art, the present invention provides a power line carrier communication method based on frequency domain processing

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  • Power line carrier communication method based on frequency domain processing
  • Power line carrier communication method based on frequency domain processing
  • Power line carrier communication method based on frequency domain processing

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Embodiment Construction

[0028] The present invention will be described in detail below through specific embodiments in conjunction with the accompanying drawings, so as to better understand the present invention, but the following embodiments do not limit the scope of the present invention. In addition, it should be noted that the diagrams provided in the following embodiments are only schematically illustrating the basic concept of the present invention, and only the components related to the present invention are shown in the drawings rather than the number of components, Shape and size drawing, the shape, quantity and proportion of each component can be changed arbitrarily during actual implementation, and the layout of the components may also be more complicated.

[0029] The invention maps the transmitted original bit information to the carrier modulation information, and uses the power frequency signal on the power line as a synchronous signal to arrange the modulated information to be sent at t...

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Abstract

The invention provides a power line carrier communication method based on frequency domain processing. The power line carrier communication method based on frequency domain processing comprises the steps of: establishing initial sending and receiving time synchronization based on specific zero-crossing characteristics and three-phase 120-degree phase difference characteristics of a power line; representing bit information as a continuous phase carrier frequency-modulated sinusoidal or cosine signal based on low-frequency square wave modulation; performing physical framing according to the bitinformation; mapping the bit information onto a low-frequency square wave signal composed of high and low levels at first, then, performing relatively high carrier modulation on the high level and thelow level separately, so that a final carrier modulation signal is formed, and sending at the zero-crossing time of the power line; and, synchronously starting a digital phase-locked loop to performfrequency demodulation according to the zero-crossing time by a receiving end, and simultaneously, performing final data decision output through fast Fourier transform by selecting a proper window. The method provided by the invention is low in cost and simple to implement; furthermore, all kinds of multi-path interferences and all kinds of noise and pulse interferences in a severe power line environment can be effectively resisted; and thus, reliable transmission of data information is realized.

Description

technical field [0001] The invention relates to the technical field of simultaneous digital and analog information transmission, in particular to a power line carrier communication method based on frequency domain processing. Background technique [0002] The power line carrier communication system consists of a transmitter, a receiver, and a power line connecting the transmitter and receiver. The data information to be transmitted by the user is sent by the transmitter after being modulated, and the receiver demodulates and receives the information after passing through the power line. [0003] The working frequency of the power line carrier communication is much higher than the power frequency signal of the power grid 50Hz or 60Hz. Such a high frequency signal can be transmitted in the power line simultaneously with the electric energy. Therefore, the existing low-voltage power distribution network infrastructure can be fully utilized without any wiring. It is a "No New W...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26H04B3/54
CPCH04B3/54H04L27/2655H04L27/2688
Inventor 不公告发明人
Owner 深圳市力合微电子股份有限公司
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