| 摘要 |
The present invention relates to an asynchronous transmission method based on a zero-crossing transmission mode in power line carrier communications, comprising: step A, sample power of a mains supply in real time according to a pre-set sampling frequency and count a sampling number, and when the power of the mains supply crosses a zero point and the counted number reaches an estimated mains supply zero-crossing period sampling number, clear the counted number; step B, a sending end determines, according to the length of each component of a data packet, a sending start moment of each component, the sending start moment being represented by the counted number; and step C, a receiving end receives data, sent by the sending end, of each frame fragment. The present invention adopts an asynchronous transmission form, a sending end determines sending start time at each zero-crossing point, the sending end only needs to send effective information at positions close to the zero-crossing points, and a receiving end only needs to obtain the effective information in a timing manner according to a certain mechanism and does not need to know specific positions of the zero-crossing points, thereby avoiding influence on signal transmission and alternating current waveform synchronization from errors of a mains supply power period, and improving the pulse interference resisting capability. |
