A synchronization method in orthogonal frequency division multiplexing system
A technology of orthogonal frequency division and sub-synchronization, applied in transmission systems, synchronizing devices, digital transmission systems, etc., can solve the problems of not getting a closed-form solution of frequency offset and being sensitive to frequency offset.
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[0039] Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.
[0040] Referring to Fig. 1, it is a schematic flow diagram of a method for realizing synchronization in the OFDM wireless system described in the embodiment of the present invention, and the specific process is as follows:
[0041] Step 110: Construct a preamble / synchronization sequence at the sending end and frame it for sending.
[0042] The sending end constructs a preamble / synchronization sequence when framing, and its preferred scheme includes a cyclic prefix and a PN sequence. The preamble sequence may include at least one preamble symbol, and its time domain characteristic is that the length is N I The PN sequence repeats I times, where I=N / N I, N is the number of subcarriers of OFDM. The OFDM data symbols to be sent are sent by the sending antenna after being framed.
[0043] Step 120: Perform primary time synchronization in combina...
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