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Non-continuous frame sending method, channel compensation method

A transmission method, a non-continuous technology, applied in the direction of digital transmission system, electrical components, modulated carrier system, etc., can solve problems such as not considering the power frequency voltage, frame synchronization deviation, affecting the demodulation performance of received data at the receiving end, etc. To achieve the effect of ensuring communication reliability, simple implementation and efficient method

Inactive Publication Date: 2018-03-06
MIARTECH
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Problems solved by technology

However, these invention patent applications do not take into account that the power frequency voltage is not a perfect sinusoidal signal, and there is jitter at its zero-crossing point. The jitter at the zero-crossing point will cause frame synchronization deviation, which will eventually affect the demodulation performance of the received data at the receiving end.

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  • Non-continuous frame sending method, channel compensation method
  • Non-continuous frame sending method, channel compensation method

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Embodiment Construction

[0058] In the following description, many specific details are set forth in order to fully understand the present invention, but the present invention can also be implemented in other ways than those described here, so the present invention is not limited by the specific embodiments disclosed below.

[0059] In order to eliminate the influence of the zero-crossing jitter mentioned in the background technology, on the one hand, the present invention sends a specific discontinuous frame at the transmitting end, and the leading OFDM symbol and the data OFDM symbol of the subframe in the discontinuous frame are all added with a cyclic prefix; On the other hand, the specific non-continuous frame is used at the receiving end to perform channel compensation to eliminate the influence of zero-crossing jitter.

[0060] originate

[0061] figure 1 It is a schematic diagram of discontinuous frame transmission of the OFDM-based power line carrier communication system of the present inven...

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Abstract

The invention provides a non-continuous frame sending method and a channel compensation method which are applied to a power-line carrier communication system based on OFDM. The non-continuous frame sending method comprises sending a specific non-continuous frame, wherein cyclic prefixes are added to the precursor OFDM symbol and the data OFDM symbol of a subframe in the non-continuous frame. The channel compensation method carried out channel estimation and compensation by means of the specific non-continuous frame in order to eliminate influence of zero crossing point jitter.

Description

technical field [0001] The present invention mainly relates to the field of power line carrier communication, in particular to a method for sending discontinuous frames and a channel compensation method in a power line carrier communication system. Background technique [0002] Low-voltage power line communication (Power Line Communication, PLC) technology has attracted global attention in recent years due to its inherent low cost, no need for special wiring, and easy network coverage to the "last mile". And the field of energy measurement has been more in-depth application. As one of the key technologies for future Internet of Things and smart home applications, how to achieve high-speed communication with high reliability in the complex noise environment of low-voltage power lines has always been a technical problem in this field. Since the application of power line carrier communication in the fields of home appliance automation control and electric vehicle charging pile...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26H04L27/38
CPCH04L27/2678H04L27/2691H04L27/2695H04L27/3854
Inventor 孙鉴
Owner MIARTECH
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