Symbol timing synchronization method of OFDM system

Abstract

The invention discloses a symbol timing synchronization method of an OFDM system. With the method, problems that no single sharp timing offset estimation function peak value is provided in the prior art and too much time is spent in determining an ideal timing position can be solved. The method comprises the following steps: 1, generating a training sequence and inserting the training sequence in front of a load data packet; 2, calculating a timing offset estimation function value at an initial position time of a sliding window at a receiving terminal; 3, taking an average of timing offset estimation functions of M times before the time at any time; 4, determining a weighting coefficient of the timing offset estimation function average value; 5, calculating a dynamic threshold according to the obtained timing offset estimation function average value and weighting coefficient; and 6, comparing the timing offset estimation functions and the dynamic threshold until detecting an ideal timing position of the current load data packet; and carrying out the operation continuously according to the mechanism to obtain an ideal timing position of each subsequent data packet. Therefore, timing can be realized accurately in a low-signal-to-noise-ratio environment and the real-time performance is good.

Description

technical field [0001] The invention belongs to the field of communication technology, in particular to a symbol timing synchronization method, which can be used for real-time symbol timing synchronization in an OFDM system Background technique [0002] Orthogonal frequency division multiplexing OFDM technology is a multi-carrier transmission technology. It decomposes high-speed data streams into lower-rate data streams through serial-to-parallel conversion, and then modulates them into mutually orthogonal subcarriers. Overlapping each other, using these advantages can effectively improve spectrum utilization and resist channel interference. [0003] Although OFDM technology has many advantages, compared with single-carrier technology, the application of multi-carrier technology makes the requirements for time-domain synchronization and frequency-domain synchronization very strict. If good time-frequency domain synchronization cannot be established, the system will suffer se...

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to propose a symbol timing synchronization method for an OFDM system to solve the problem that the prior art does not have a single sharp peak value of the timing offset estimation function, and the time-consuming problem of obtaining the peak value to determine the timing position is too long

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