Sending device, reception device, and synchronization signal transmission method and system

Embodiments of the present invention relate to the field of wireless communications. Provided are a sending device, a reception device, and a synchronization signal transmission method and system. The sending device comprises: a signal generation module, used for generating a synchronization signal, every N characters of the synchronization signal comprising one synchronization sequence character and N-1 insertion characters located in specified positions; a zero setting module, used for setting to zero the N-1 characters located in the specified positions in every N characters of the synchronization signal; and a sending module, used for sending the synchronization signal after zero setting to a reception device. In the present invention, by generating a synchronization signal every N characters of which comprise one synchronization sequence character and N-1 insertion characters located in specified positions and sending, to a reception device, the synchronization signal of which the N-1 characters located in the specified positions in every N characters are set to zero, the problem that part of information of a synchronization signal is lost when N-1 characters in every N characters in a baseband signal are set to zero is solved, and the objective of ensuring synchronization performance is achieved.