Method of synchronizing precise timing of DVB-T2 (Digital Video Broadcasting-Terrestrial 2) system

A DVB-T2 and timing synchronization technology, applied in multi-frequency code systems, electrical components, selective content distribution, etc., can solve the problems of slow system locking time, complicated system control, and long time for searching and changing channels

Active Publication Date: 2014-01-08
HUNAN GOKE MICROELECTRONICS
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Problems solved by technology

Since each FFT/IFFT operation will consume a large amount of computing time, when the number of paths in the channel is large (greater than 5), the system locking time will become very slow, which will lead to v

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  • Method of synchronizing precise timing of DVB-T2 (Digital Video Broadcasting-Terrestrial 2) system
  • Method of synchronizing precise timing of DVB-T2 (Digital Video Broadcasting-Terrestrial 2) system
  • Method of synchronizing precise timing of DVB-T2 (Digital Video Broadcasting-Terrestrial 2) system

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Embodiment Construction

[0083] In digital TV systems such as DVB-T2, the role of fine timing synchronization is to first determine the state of the channel impulse response, and then adjust the FFT window of the OFDM symbol accordingly, so that the inter-symbol interference (ISI) in the received OFDM symbol ) minimum.

[0084] Method flowchart of the present invention sees Figure 5 .

[0085] 1) Use the pilot of the P2 symbol transmitted by the transmitter to generate the time-domain pilot information p2_prbs(w), and store it:

[0086] a) pass Figure 4 The given PRBS sequence generator generates a PRBS sequence p2_prbs0(q), q=[0~kmax-1], kmax is the number of valid subcarriers in the P2 symbol in the current transmission mode;

[0087] Figure 4 The generator polynomial for the PRBS generator shown is: x 11 +x 2 +1 where x is 0 or 1;

[0088] b) Determine the interval dx of the P2 symbol pilot according to the current transmission mode, that is, the FFT mode;

[0089] c) Set zero to the pos...

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Abstract

The invention discloses a method of synchronizing precise timing of a DVB-T2 (Digital Video Broadcasting-Terrestrial 2) system. The method comprises the steps: extracting the pilot frequency of a first P2 symbol in the received T2 frame, performing pseudo random sequence correction, and carrying out IFFT (Inverse Fast Fourier Transform) to obtain channel impulse response; according to the average power and envelope of the channel impulse response, separating the effective path in the channel impulse response; making relation with a time domain P2 signal by using the time domain signal of the locally generated P2 pilot frequency according to the position of the effective path in the channel impulse response and the imaging position of the effective path, analyzing and judging the true position of the path in the channel impulse response; judging the characteristic of a channel by judging whether a path exists before a main path of a CIR, thus regulating the window of FFT (Fast Fourier Transform) in time domain by utilizing the minimal intersymbol interference principle. By utilizing the method, the computation amount and locking time can be greatly reduced, the synchronization accuracy of the precise timing can be improved, and the power consumption of the DVT-T2 system can be decreased.

Description

technical field [0001] The invention relates to a method for fine timing synchronization and FFT window adjustment in a DVB-T2 system. Background technique [0002] In a multi-carrier system, in order to maintain the orthogonality of OFDM symbols and minimize the mutual interference (ISI) between OFDM symbols, a guard interval (GI) is usually inserted between two OFDM symbols to achieve the above the goal of. That is, a certain proportion of the tail of the current OFDM symbol is copied to the start position of the current OFDM symbol. [0003] In a multi-carrier system, in order to adapt to different channel environment conditions, there are usually a variety of guard interval ratio modes to choose from. In the receiver, the length of the guard interval selected by the current system must be determined in order to correctly determine the start of the OFDM symbol. Location. In a multi-carrier system, in order to receive signals correctly, the receiver must determine the s...

Claims

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Application Information

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IPC IPC(8): H04L27/26H04N21/61
Inventor 朱志敏
Owner HUNAN GOKE MICROELECTRONICS
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