Symbol synchronization method in visible light DCO-OFDM communication system

[0022] like figure 1 As shown, the symbol synchronization method of the visible light DCO-OFDM communication system of this embodiment includes the following steps:

[0023] S1. The transmitter generates a mirror-symmetrical preamble.

[0024] This step specifically includes: (1) transmitter generates sequence P=[X 1 , X 2 ,...,X N / 2-1 ]; where element X 1 ,X 2 ,...,X N / 2-1 Both are real numbers, and N is the number of subcarriers in the DCO-OFDM communication system; (2) Arrange the sequence P in reverse order to obtain the sequence P mi =[X N / 2-1 ,X N / 2-2 ,...,X 1 ]; (3) for sequence M=[0 P 0 P mi ] to perform IFFT or IDFT transformation to obtain the preamble sequence [x 0 , x 2 ,...,x N-1 ], the sequence is a time-domain value, according to the properties of IFFT and IDFT, P=[X 1 , X 2 ,...,X N / 2-1 ] The signals in ] are all real numbers, so there are: Therefore, the leading sequence [x 0 , x 2 ,...,x N-1 ] can be transformed into Among them,