Method for correcting symbols regularly in DVB-T2 system
A DVB-T2, symbol timing technology, applied in the multi-frequency code system and other directions, can solve the problems such as the inability to apply to the DVB-T2 system, the large chip COST and POWER, and the large amount of calculation.
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[0048] In DVB-T2 and other digital TV systems, the synchronization module generally performs symbol synchronization first and then performs pattern detection and frequency offset estimation. The former is to find the exact position of the signal frame and symbol, and the latter is to complete further signal analysis and analysis to find the transmission mode and frequency offset of the system.
[0049] [a] Symbol synchronization
[0050] 1) Use S1 and S2 to generate the P1 symbol.
[0051] After the frame synchronization is locked, two parameters S1 and S2 will be provided. These two parameters indicate the FFT mode and MISO mode adopted by the current system, which determine the content and structure of the frame header P1 symbol of the DVB-T2 system.
[0052] Table 1S1 and S2 modulation modes
[0053]
[0054] As can be seen from the above table, S1 and S2 are 3-bit and 4-bit parameters, corresponding to 8 and 16 possible sequences, respectively. The sequence length co...
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