OFDM symbol timing synchronization method based on high carrier number

Abstract

The invention provides an OFDM symbol timing synchronization method based on a high carrier number. A synchronization training sequence is inserted into sent signals at a sending end; sampling is carried out at a receiving end, and the sampling value is stored as a sample value window; the energy of each sampling point in the sample value window is worked out and stored in a register; from the first point to a (5N / 4 + L) point in the sample value window, calculation of a measurement function is carried out in a mode that a mobile window with the length of N / 4 moves by the step length of D=2n every time, an accurate minimum value position is found out, and a rough synchronizing process is finished; a fine synchronizing process is carried out near the accurate minimum value position, calculation of a fine synchronizing measurement function is carried out in a mode that in TD-1 points in front of and at the back of the rough synchronizing position, the mobile window with the length of N / 4 moves one bit of length every time, the minimum value position is found out, and the fine synchronizing process is finished; timing synchronous correction of symbols is carried out through the fine synchronizing estimation value. The OFDM symbol timing synchronization method based on the high carrier number lowers the calculation complexity and anti-interference performance of a system to the maximum extent, can carry out accurate timing judgment under an input signal-to-noise ratio grade of an actual NG-DSL system, and achieves the purpose of high-speed transmission.

Description

technical field [0001] The invention relates to the technical field of communication, and more specifically, relates to a method for efficiently performing timing synchronization of OFDM symbols with a high number of carriers in a twisted pair channel medium. Background technique [0002] With the rapid development of Internet technology, applications such as high-definition Internet TV, large-scale online games, and online video conferencing are gradually becoming popular. However, the current network speed in my country is far from enough. We need higher-speed access technology to meet the needs of people. For future bandwidth needs. Next Generation Digital Subscriber Line (NG-DSL, Next Generation Digital Subscriber Line) technology will be an important high-speed wired access technology in the future. The bandwidth of this access technology will exceed 100M, and the transmission rate will exceed 1Gbps, which can well Combined with the optical fiber network, the network sp...

AI Technical Summary

Problems solved by technology

[0005] Aiming at the shortcomings of high complexity and weak anti-interference ability in the existing symbol timing synchronization method, the present invention proposes a method for OFDM symbol timing synchronization based on a high number of carriers, which is a new OFDM signal suitable for a high number of carriers and The symbol timing synchronization method suitable for actual NG-DSL transmission engineering applications minimizes the computational complexity and anti-interference performance of the system, and can perform accurate timing judgments under the input signal-to-noise ratio level of the actual NG-DSL system , to achieve the purpose of high-speed transmission

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