Asynchronous transmission method in power line carrier communication based on zero-crossing transmission mode
A power line carrier and transmission mode technology, applied in the field of asynchronous transmission, can solve the problems of terminal zero-crossing point detection and cycle estimation error, mains power cycle error, unreliable and other problems, and achieve the effect of improving the anti-pulse interference ability.
Inactive Publication Date: 2017-09-29
RISECOMM MICROELECTRONICS SHENZHEN
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But this method of finding the position according to the rules is not reliable, because there is an error in the mains power cycle, and there are errors in the zero-crossing detection and cycle estimation on each terminal. Only when there is no error, each can use the standard base to find location rules are valid
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[0029] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.
[0030] The power line carrier communication method based on the zero-crossing transmission mode proposed by the present invention includes the following steps:
[0031] Step A: Perform real-time power sampling of the mains according to the preset sampling frequency, and at the same time, count the samples; when the mains power crosses zero and the count reaches the estimated number of samples of the mains zero-crossing period, the count is cleared. The current sampling count can be used to indicate the current phase of the mains, or the power state, and provide a basis for determining the start time of data transmission. Generally speaking, counting starts when the power crosses zero. When the mains crosses zero again, it means that the mains has p...
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The invention relates to an asynchronous transmission method in power line carrier communication based on a zero-crossing transmission mode, comprising step A: performing real-time power sampling on the mains according to a preset sampling frequency, and at the same time counting the samples; when the power of the mains crosses zero And when the count reaches the estimated number of samples of the mains zero-crossing cycle, the count is cleared; Step B: the sending end determines the sending start time of each component according to the length of each component of the data packet; the sending start time Indicated by the count; step C: the receiving end receives each frame segment data sent by the sending end. The present invention adopts the form of asynchronous transmission, and at each zero-crossing point, the sending end sets the sending start time, and the sending end only needs to send valid information near the zero-crossing point, while the receiving end only needs to obtain valid information regularly according to a certain mechanism, and does not need to know The specific position of the zero point avoids the impact of the error of the mains power cycle on the signal transmission and the synchronization of the AC waveform, and improves the anti-pulse interference ability.
Description
technical field [0001] The invention relates to the field of power line carrier communication, in particular to an asynchronous transmission method in power line carrier communication based on a zero-crossing transmission mode. Background technique [0002] The G3 (international standard for power line carrier communication) physical layer supports two types of frame structures: frame structures of data types (such as figure 1 shown) and the frame structure of the response type (such as figure 2 shown). Both the data frame and the response frame are composed of a preamble (Preamble) and a frame control header (FCH). The difference is that there is data (DATA) behind the data frame, but the response frame does not. The preamble consists of several SYNCP symbols and SYNCM symbols. The SYNCP symbol is usually a waveform of some fixed form, and the SYNCM symbol is usually the inverted waveform of the SYNCP symbol. Due to the characteristics of the commercial power (50Hz / 60H...
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IPC IPC(8): H04B3/54
Inventor 顾建
Owner RISECOMM MICROELECTRONICS SHENZHEN