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
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Embodiment 1
[0051] 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:
[0052] 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
[0053] In this implementation method, the identification of the transmission mode is carried out before data equalization, and the steps include:
[0054] (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.
[0055] (2) After transmitting 128 sym...
Embodiment 2
[0072] 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:
[0073] 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
[0074] In this implementation method, the identification of the transmission mode is carried out before data equalization, and the steps include:
[0075] (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.
[0076] (2) After transmitting 128 sy...
Embodiment 3
[0093] 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:
[0094] 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
[0095] In the method of this embodiment, the identification of the transmission mode is carried out before...
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