Method for identifying double-input Turbo code closed set in DVB-RCS2 protocol
A technology of DVB-RCS and identification method, which is applied in the field of turbo code blind identification, and can solve problems such as difficult to solve separately
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Embodiment 1
[0058] In this embodiment, an encoder with a code rate of 1 / 3 under the DVB-RCS protocol is taken as an example to illustrate the effectiveness of an equivalent encoder without erasure. Such as figure 2 As shown, it is a schematic diagram of an equivalent encoder without deletion in the present invention, and the verification output satisfies the following equation:
[0059]
[0060] The respective input and output of the two encoders can constitute a system code, and the feedback polynomials of the two system codes are consistent, denoted as h f , so the generator polynomial matrices for the two encoders can be written as:
[0061] G YA =[1,h 1 / h f ]
[0062] G YB =[1,h 2 / h f ]
[0063] Therefore, the generator polynomial matrix of the equivalent encoder is:
[0064]
[0065] Then there are encoding equations:
[0066] [A(x) B(π)]G Y (x) = [A(x) B(x) Y(x)]
[0067] Obtain the check polynomial matrix of check digit by matrix transformation method as H=[h ...
Embodiment 3
[0070] In this embodiment, an encoder with a 3 / 4 code rate under the DVB-RCS2 protocol is taken as an example to illustrate the effectiveness of an equivalent encoder in the case of erasure. Such as image 3 Shown is a schematic diagram of the structure of the equivalent encoder in the case of deletion. Its verification output satisfies For check Y 1 , the overall check polynomial matrix obtained by the matrix transformation method is
[0071]
[0072] Then the component code check polynomial matrix is:
[0073]
[0074] Such as Figure 5 As shown, the flow chart of equivalent encoder parity parameter identification in the case of deletion, the generator polynomial matrix of the component code and the generator polynomial matrix of the entire encoder can be obtained through the identification process of the deleted convolutional code represented by steps S33-S38 are respectively :
[0075]
[0076]
[0077] The deletion mode corresponding to the even-numbere...
Embodiment 4
[0081] The purpose of this embodiment is to simulate the accuracy rate of verification and recognition under different code lengths and different code error conditions without erasure. Select the turbo code of the DVB-RCS protocol, generate multiple sets of data according to the frame length of 220 and 752 respectively, and carry out Monte Carlo simulation with a step size of 1% when the bit error rate is 0 to 5%, and obtain the recognition results, as shown in Image 6 . It can be seen that when the bit error is less than 1%, the algorithm can realize the recognition very well.
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