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Transmission mode judging method suitable to digital TV ground broadcasting transmission

A digital TV terrestrial and transmission mode technology, applied in the field of digital signal transmission

Inactive Publication Date: 2006-10-25
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The transmission mode of ATSC and DVB-T mentioned above, the disadvantage is that because no special spread spectrum protection is adopted, the transmission mode can only be known under the premise of correctly demodulating the data

Method used

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  • Transmission mode judging method suitable to digital TV ground broadcasting transmission
  • Transmission mode judging method suitable to digital TV ground broadcasting transmission
  • Transmission mode judging method suitable to digital TV ground broadcasting transmission

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] attached image 3 It is the general block diagram of this implementation method. In this implementation method, a memory with a length of 128 bits is used to store a random sequence. The "0" in the random sequence of bits is mapped to the random sequence formed by "-1", and its complete value is as follows:

[0051] 1 -1 -1 -1 -1 -1 -1 1 -1 -1 -1 1 -1 -1 1 1 -1 -1 -1 1 -1 1 1 1 -11 -1 1 1 -1 1 1 - 1 -1 -1 -1 -1 1 1 -1 -1 1 1 -1 1 -1 1 -1 -1 1 1 1 1 -1-1 1 1 1 1 -1 1 1 -1 1 -1 -1 - 1 -1 1 -1 1 -1 1 -1 1 1 1 1 1 -1 1 -1-11 -1 1 -1 -1 -1 1 1 -1 1 1 1 -1 -1 -1 1 1 1 1 1 1 1 -1 -1 -1 -1 1 1 1-1 1 1 1 1 -1 -1 1 -1 1 1 -1 -1 1 -1-1 -1

[0052] In this implementation method, the identification of the transmission mode is carried out before data equalization, and the steps include:

[0053] (1) When the input data arrives at the system information bit in the data frame, multiply the input data with the data in the memory one by one.

[0054] (2) After transmitting 128 symbo...

Embodiment 2

[0071] attached Figure 4 It is the general block diagram of this implementation method. In this implementation method, a memory with a length of 128 bits is used to store a random sequence. The "0" in the random sequence of bits is mapped to the random sequence formed by "-1", and its complete value is as follows:

[0072] 1 -1 -1 -1 -1 -1 -1 1 -1 -1 -1 1 -1 -1 1 1 -1 -1 -1 1 -1 1 1 1 -11 -1 1 1 -1 1 1 - 1 -1 -1 -1 -1 1 1 -1 -1 1 1 -1 1 -1 1 -1 -1 1 1 1 1 -1-1 1 1 1 1 -1 1 1 -1 1 -1 -1 - 1 -1 1 -1 1 -1 1 -1 1 1 1 1 1 -1 1 -1-11 -1 1 -1 -1 -1 1 1 -1 1 1 1 -1 -1 -1 1 1 1 1 1 1 1 -1 -1 -1 -1 1 1 1-1 1 1 1 1 -1 -1 1 -1 1 1 -1 -1 1 -1-1 -1

[0073] In this implementation method, the identification of the transmission mode is carried out before data equalization, and the steps include:

[0074] (1) When the input data arrives at the system information bit in the data frame, multiply the input data with the data in the memory one by one.

[0075] (2) After transmitting 128 symb...

Embodiment 3

[0092] attached Figure 5 It is the general block diagram of the present embodiment method, in this implementation method, adopts a random sequence generation unit to produce the random sequence of 128, this random sequence generation unit comprises a 7-bit shift register, this shift register adjusts when resetting Enter the initial value 0000001, the generator polynomial of the random sequence is X 7 +X 3 +1, it needs to add a "0" at the end. On output, "0" is mapped to "-1". The complete value of the 128-bit random sequence is as follows:

[0093] 1 -1 -1 -1 -1 -1 -1 1 -1 -1 -1 1 -1 -1 1 1 -1 -1 -1 1 -1 1 1 1 -11 -1 1 1 -1 1 1 - 1 -1 -1 -1 -1 1 1 -1 -1 1 1 -1 1 -1 1 -1 -1 1 1 1 1 -1-1 1 1 1 1 -1 1 1 -1 1 -1 -1 - 1 -1 1 -1 1 -1 1 -1 1 1 1 1 1 -1 1 -1-11 -1 1 -1 -1 -1 1 1 -1 1 1 1 -1 -1 -1 1 1 1 1 1 1 1 -1 -1 -1 -1 1 1 1-1 1 1 1 1 -1 -1 1 -1 1 1 -1 -1 1 -1 -1 -1

[0094] In the method of this embodiment, the identification of the transmission mode is carried out before ...

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Abstract

Before carrying out equalization processing for data stream, the receiving end of the transmission system carries out recognition for transmission mode. The method includes steps: (1) when received data stream reaches system information bit in data frame, the input data starting multiplication to random sequence data in n bits one by one; mode for creating random sequence data in n bits is identical to mode for creating random sequence in system information generation procedure to carry out randomization process for Walsh sequence blocks; (2) after n pieces of symbol are transmitted, Walsh transform is carried out for multiplied result of n bits corresponding to these symbols; (3) fetching one maximal absolute value from n pieces of outputs after Walsh transform; based on definition of mode word in system information in time of transmission, finding out corresponding system information; then, finding out transmission mode of data frame matched to the system information.

Description

technical field [0001] The invention relates to a method in the technical field of digital signal transmission, in particular to a transmission mode discrimination method suitable for digital television terrestrial broadcast transmission. Background technique [0002] A typical wireless transmission system includes a transmitter and a receiver, figure 1 It is a typical system block diagram of digital wireless transmission. The transmission process includes: at the transmitting end, the digital signal is encoded first, and then necessary auxiliary information is added, and the encoded digital signal is filtered by the channel to form a baseband signal; the baseband signal is modulated to the corresponding frequency band by the up-converter and then sent . At the receiving end, the tuner converts the high-frequency signal to the baseband and obtains a digital signal through an analog-to-digital converter; the digital signal is restored to information consistent with the send...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N5/46H04N7/24
Inventor 归琳孙军梁伟强
Owner SHANGHAI JIAO TONG UNIV
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