A device for transmitting data by using a power line, comprising a setting module, a start time determining module, a transmitting module, and a determination module, wherein
- the setting module is configured to set i=1 and j=1, and notify the start time determining module to start operating;
- the start time determining module is configured to receive an i-th zero crossing signal at a time point ti, determine, based on the i-th zero crossing signal, a start time when synchronization signals of a j-th data packet are transmitted, and transmit the start time to the transmitting module, wherein the start time when the synchronization signals of the j-th data packet are transmitted is ti+t, ti+t is earlier than a time point ti+1 when an (i+1)-th zero crossing signal is received, and t is a first predetermined fixed value;
- the transmitting module is configured to transmit the synchronization signals of the j-th data packet in sequence at the start time when the synchronization signals of the j-th data packet are transmitted, wherein said transmitting the synchronization signals of the j-th data packet in sequence comprises transmitting S synchronization bit signals and S flipped synchronization bit signals in sequence, the time point ti+1 is comprised in a time period from a time point when a 1-st synchronization bit signal is transmitted to a time point when an S-th flipped synchronization bit signal is transmitted, a 1-st flipped synchronization bit signal to the S-th flipped synchronization bit signal in the S flipped synchronization bit signals are signals with same levels as an S-th synchronization bit signal to the 1-st synchronization bit signal, respectively, and S is a second predetermined fixed value and is a positive integer greater than or equal to 2;
- the transmitting module is further configured to transmit data signals of the j-th data packet in sequence, wherein said transmitting the data signals of the j-th data packet in sequence comprises transmitting N data bit signals in sequence, where N is a number of data bits comprised in each data packet and is a positive integer;
- the determination module is configured to determine whether j is equal to M,
- when j is not equal to M, notify the setting module to continue operating, and
- when j is equal to M, end a current data transmission, wherein M is a number of data packets into which data to be transmitted is divided and is a positive integer;
- and
- the setting module is further configured to set i=i+n and j=j+1, and notify the start time determining module to start operating, wherein i is a positive integer, j is a positive integer, and n is a third predetermined fixed value and is a positive integer.