Synchronization method and device for flexible subcarrier OFDM (Frequency Division Multiplexing) system

The invention discloses a synchronization method for a flexible subcarrier OFDM (Frequency Division Multiplexing) system, belonging to the technical field of wireless communication transmission. The synchronization method comprises the following steps: (S1) a transmitting end modulates known sequences to generate a training sequence frame on an efficient subcarrier set selected according to service needs and modulates efficient data to generate a time domain signal frame; (S2) the transmitting end combines the training sequence frame and the time domain signal frame into transmitting signals and transmits the transmitting signals through an antenna or a coupler and the like; (S3) a receiving end carries out down sampling on the received signals and local training sequences; (S4) the receiving end carries out timing estimation by using the down sampled signal; and (S5) the receiving end estimates carrier frequency shift. According to the synchronization method, accurate timing estimation is realized, and the c