Asynchronous transmission method for power line carrier communication on basis of zero-passage 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: 2015-07-08
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 for power line carrier communication on the basis of a zero-passage transmission mode. The method comprises the steps that A, real-time power sampling is carried out on mains supply according to preset sampling frequency, and meanwhile the number of times for sampling is counted; when power of the mains supply passes a zero point, and the counted number reaches the estimated number of times for sampling of the mains supply zero-passage period, the counted number is cleared; B, a transmitting terminal determines the transmitting start moment of each component according to the length of each component of a data packet, and the transmitting start moment is represented through the counted number; C, a receiving terminal receives data, transmitted by the transmitting terminal, of all frame fragments. According to the method, the asynchronous transmission is adopted, the transmitting terminal determines the transmitting start time for each zero-passage point, and only needs to transmit effective information at the position close to the zero-pass points, and the receiving terminal only needs to obtain the effective information in a timing mode according to a certain mechanism, and does not need to know the specific position of each zero-passage point, so that influence on signal transmission and alternating current waveform synchronization from errors of the mains supply power period is avoided, and the pulse interference resisting ability is improved.
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