OFDM synchronization method under high-dynamic environment

Abstract

The invention belongs to the technical field of the wireless communication, and discloses a OFDM synchronization method under a high-dynamic environment. The OFDM synchronization method under the high-dynamic environment comprises the following steps: performing transformation on a frequency domain ZC sequence; performing IFFT on the transformed frequency domain ZC sequence; performing timing synchronization by a receiving end according to a lead sequence structure of a sending end, and acquiring an accurate timing point according to a timing metric function; performing trice iterative fractional part of frequency offset estimation; estimating to obtain the fractional part of frequency offset and performing frequency offset compensation on a signal; performing integer frequency offset estimation by use of the shifting characteristic of the ZC sequence and compensating, thereby accomplishing the synchronization at the receiving end. A symbol sample count in the OFDM system adopted by the method disclosed by the invention is less, so that the entire complexity is low, the synchronization acquisition can be fast accomplished; and meanwhile, the length of the lead sequence can be added or deleted according to system demands, and the flexibility is high; the synchronization method disclosed by the invention can be used for OFDM synchronization acquisition in a remote-measuring system and like high-dynamic environment.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and in particular relates to an OFDM synchronization method in a high dynamic environment. Background technique [0002] OFDM (Orthogonal Frequency Division Multiplexing) technology has high spectrum utilization rate and strong anti-multipath ability. used in wireless communication standards. Synchronization is an important problem to be solved in the communication system. It is directly related to the overall performance of the communication system and plays a very important role. Synchronization problems in OFDM systems mainly include time synchronization, frequency synchronization and sampling rate synchronization, because sampling rate deviation has little impact on the system. In the OFDM system, the purpose of time synchronization is to find the starting position of the OFDM symbol to perform Fast Fourier Transform (Fast Fourier Transform, FFT) operation to complete the dem...

AI Technical Summary

Problems solved by technology

[0003] To sum up, the problems existing in the existing technology are: the traditional time-frequency synchronization algorithm reduces the performance of timing synchronization due to the existence of a large Doppler frequency offset and the influence of unknown transmission channels in a low signal-to-noise ratio and high dynamic environment. accuracy, the performance of the system drops sharply

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