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Method for identifying pseudorandom scrambling codes

An identification method and pseudo-random technology, applied in the field of scrambling code identification, can solve the problems of not being able to identify the initial state, only identifying the polynomial of the scrambler, and long identification time, etc., so as to increase the scope of application of identification, improve the efficiency of identification time, The effect of improved recognition accuracy

Inactive Publication Date: 2014-02-05
UNIV OF ELECTRONICS SCI & TECH OF CHINA +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In short, the existing methods have strict restrictions on the ratio of 1 and 0 of the scrambler input information sequence, or can only identify the scrambler polynomial but not its initial state, or the recognition time is too long when the number of scrambler stages is high , and these methods need to know in advance the approximate value of the ratio of 1 and 0 in the input information sequence of the scrambler, and there are some limitations in the accuracy and efficiency of recognition

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  • Method for identifying pseudorandom scrambling codes
  • Method for identifying pseudorandom scrambling codes
  • Method for identifying pseudorandom scrambling codes

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Embodiment

[0035] figure 1 It is a flow chart of the identification method based on the pseudo-random scrambling code of the present invention.

[0036] In this embodiment, as figure 1 As shown, the steps of the identification method based on the pseudo-random scrambling code of the present invention are:

[0037] S101, run statistics determine the number of stages l of the scrambler at l 0 1 In the range of , and set the initial value of the advantage value T to 0;

[0038] S102, in l 0 1 Take every possible value of l within the range of ;

[0039] S103. Get all possible structures G(x) of the scrambler, and the number of taps K≤4;

[0040] S104. Calculate the advantage value T1 and compare it with the advantage value T. When T1≤T, enter step S106. When T1>T, enter step S105;

[0041] S105, let T1=T, g(x)=G(x);

[0042] S106, traversing all possible structures G(x) of the scrambler, if the traversal is completed, enter step S107, otherwise repeat step S103;

[0043] S107, trave...

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Abstract

The invention provides a method for identifying pseudorandom scrambling codes. According to the method for identifying the pseudorandom scrambling codes, a generating polynomial of a scrambler is identified by using m sequence statistical properties, and then the initial state of the scrambler is accurately identified by using convolution correlation attacks. Compared with a scrambling code identifying method based on the m sequence statistical properties, the limitation that the scrambling code identifying method based on the m sequence statistical properties can only identify polynomials is broken. Compared with a convolution correlation attacking method, due to the fact that the accurate generating polynomial g(x) is found through the scrambling code identifying method based on the m sequence statistical properties, the pre-estimation generating polynomial set does not need to be solved, the pre-estimation initial state obtained in the Viterbi coding stage by solving does not need to be matched with every pre-estimation polynomial either, the time efficiency and the accuracy of the identification are improved, the proportional range of the input sequence 1, 0 of the scrambler is enlarged, and thus the application range of the identification is enlarged.

Description

technical field [0001] The invention belongs to the technical field of scrambling code identification, and more specifically relates to a pseudo-random scrambling code identification method. Background technique [0002] In order to improve the performance of the actual digital communication system, the signal often uses scrambling coding technology before transmission. How to quickly and correctly identify the scrambling code used by the other party is a basic problem for the communication reconnaissance system to realize information interception. The currently existing scrambling code identification methods mainly include Walsh-Hadamard method, special case identification method, bit correlation detection method, differential attack method, sampling attack method, combined enumeration method for superior value, method based on m-sequence statistical characteristics, convolution correlation attack method etc. [0003] In the prior art, the scrambling code identification me...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/00
Inventor 吴曼虞红芳刘曼杜宇峰张建立
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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