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Fine symbol timing synchronization method and device

A technology of precise symbol synchronization and signal, applied in synchronization devices, digital transmission systems, electrical components, etc., can solve the problems of low SNR value, inaccurate precise symbols, misjudgment, etc., and achieve the effect of short synchronization time

Active Publication Date: 2013-05-01
扬智电子科技(中国)有限公司
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Problems solved by technology

In addition, in a multi-path channel, the energy of the symbol signal of some paths is relatively small (generally, the difference is more than 18dB) and the SNR value is very low relative to the energy of the symbol signal of the largest path, which leads to this The traditional fine-signature method becomes inaccurate and leads to misjudgment
[0023] In summary, when the SNR value is relatively low, if the symbol signal is transmitted in a wireless channel with multipath fading, it is difficult for the receiver using the traditional fine symbol synchronization method to stably detect the correct synchronization of the symbol signal. Location

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  • Fine symbol timing synchronization method and device
  • Fine symbol timing synchronization method and device

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Embodiment Construction

[0108] Figure 4A It is a schematic diagram of the frame structure (Frame Structure) of the second generation digital TV terrestrial broadcasting system (DVB-T2). First, by Figure 4A It can be seen that the DVB-T2 system is composed of super frames (Super Frame), T SF Indicates the time occupied by a superframe. Each Super Frame is composed of a T2 frame (T2-frame), and following the T2-frame are future extension frame parts (Future Extension Frame Parts, FEF Parts). The T2-frame is composed of several symbol signals (Symbol), the first one is P1 symbol, followed by several P2symbols, and then several data symbol signals (Data Symbol). The embodiment of the present invention mainly uses the P2 symbol ( Figure 4A P20~P2 N in P2-1 ) to carry out the fine symbol synchronization method, this is because the P2 symbol has some available pilot frequency (Pilot), which is suitable for the calculation method proposed by the present invention.

[0109] The DVB-T2 system has two ...

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Abstract

The embodiment of the invention provides a fine symbol synchronization method for the second generation of digital television terrestrial broadcasting system and a device for the second generation of digital television terrestrial broadcasting system. By the fine symbol synchronization method, a path having a minimum mean square deviation is found out from a plurality of paths to act as a first path, and the formula of the mean square deviation of the first path can be calculated by a simplified mean square deviation formula. Therefore, the fine symbol synchronization method is short in synchronization time, and the first path can be found out correctly, so that a starting position of a Fast Fourier conversion window is locked at the correct starting position of the symbol signal of the first path.

Description

technical field [0001] The present invention relates to a symbol timing synchronization (Symbol Timing Synchronization) method and device, and in particular to a precise digital video broadcasting system (Digital Video Broadcasting-Second Generation Terrestrial, DVB-T2) Symbol synchronization (Fine Symbol Timing Synchronization) method and device. Background technique [0002] An Orthogonal Frequency-Division Multiplexing (OFDM) system applies a multi-carrier modulation (Multi-Carrier Modulation) technology, and divides a channel into multiple orthogonal sub-channels. Therefore, an OFDM system can convert a high-speed data stream into parallel low-speed sub-data streams, and modulate these parallel low-speed sub-data streams for transmission on each sub-channel. Wherein, the above-mentioned orthogonal signals can be separated by using related modulation technology at the receiving end, so the inter-channel-interference (Inter-Channel-Interference, ICI) between the sub-chann...

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Application Information

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IPC IPC(8): H04L27/26H04L7/027
Inventor 徐玉婷
Owner 扬智电子科技(中国)有限公司
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