Fine symbol synchronization method and device thereof
A fine symbol synchronization and signal technology, which is applied in the direction of synchronization devices, digital transmission systems, electrical components, etc., can solve the problems of low SNR value, misjudgment, and the difficulty of the receiver to detect the synchronization position of the symbol signal stably, etc., to achieve synchronization short time effect
Active Publication Date: 2015-09-30
扬智电子科技(中国)有限公司
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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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[0108] Figure 4A It is a schematic diagram of the frame structure of the second-generation digital television terrestrial broadcasting system (DVB-T2). First, by Figure 4A It can be seen that the DVB-T2 system is composed of super frames, T SF Represents the time occupied by a super frame. Each Super Frame is composed of T2 frames (T2-frame), and the T2-frame is followed by the Future Extension Frame Parts (FEF Parts). The T2-frame is composed of several symbol signals (Symbol), the first is P1 symbol, followed by several P2 symbols, 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 perform the fine symbol synchronization method, because the P2 symbol has some available pilots (Pilot), which is suitable for the calculation method proposed by the present invention.
[0109] The DVB-T2 system has two modes, one is single antenna transmission and single antenna reception (Singl...
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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 synchronization (Symbol Timing Synchronization) method and device, and particularly to a precision used in the second generation digital television terrestrial broadcasting system (Digital Video Broadcasting-Second Generation Terrestrial, DVB-T2) Symbol synchronization (Fine Symbol Timing Synchronization) method and device. Background technique [0002] The Orthogonal Frequency-Division Multiplexing (OFDM) system applies Multi-Carrier Modulation (Multi-Carrier Modulation) technology and divides the channel into multiple orthogonal sub-channels. Therefore, the OFDM system can convert the 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. Among them, the above-mentioned orthogonal signals can be separated at the receiving end using related modulation techniques, so the mutual interference (Inter-Channel-Interfer...
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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