Timing Synchronization Method in Physical Layer

Abstract

The present invention provides a timing synchronization method in a physical layer. The method is characterized in that a differential-related result related to n sets of sliding is obtained based on baseband data and a local time domain sequence after being subjected to differential operation, and N different differential values. After the further treatment, the noise is filtered out, so that a relatively low signal-to-noise ratio is obtained. Meanwhile, the number N of the N different differential values is determined based on the performance requirements of a transmission system, so that the balance of the complexity is realized. In addition, for the condition of a single differential value, a differential-related result can also be obtained based on baseband data and a local time domain sequence after being subjected to differential operation. After that, in combination with other differential-related results (Rother, m), the weighted average calculation or the weighted absolute value average calculation is conducted after the delay relationship matching process. In this way, the frame timing synchronization or the symbol timing synchronization is realized. The timing synchronization method provided in the invention skillfully utilizes the known information and filters out the noise, so that the obtained signal-to-noise ratio is relatively low. Meanwhile, the balance of the complexity is realized. Moreover, the method has the advantages of frequency offset resistance and good robust performance.

Description

technical field [0001] The invention belongs to the technical field of broadcasting and communication, and in particular relates to a timing synchronization method in a physical layer. Background technique [0002] In broadcasting systems and communication systems, the receiving end usually needs to perform symbol timing synchronization or frame timing synchronization on physical layer signals to find the initial position of the data frame so as to extract data blocks for demodulation. [0003] For example, in the DVB_T2 system, there is a preamble symbol in each frame structure, and the receiver needs to detect the position where the preamble symbol appears before performing subsequent processing. Another example is the DTMB system. Each frame structure has a PN frame header. The PN frame header is transmitted first, and then the system information and data segment are transmitted. The receiving end needs to detect the position of the PN frame header before proceeding to th...

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Problems solved by technology

[0006] The problem solved by the present invention is that the existing synchronous detection method using known information is seriously affected by the carrier frequency offset, especially for a long frame structure such as DVB_T2, it is impossible to store the entire frame data, then the existing synchronization detection method using delay sliding correlation that can resist frequency offset cannot achieve the performance of lower SNR (for example, below -10dB)

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