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Blind recognition method of self-synchronizing scrambling code generator polynomial based on autocorrelation function

An autocorrelation function and generating polynomial technology, applied in the field of communication, can solve problems such as high algorithm complexity and unsatisfactory recognition effect, and achieve the effect of small algorithm complexity, fast recognition speed and high efficiency

Inactive Publication Date: 2019-01-22
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

Although this method requires less prior information, the algorithm complexity is high and the recognition effect is not ideal

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  • Blind recognition method of self-synchronizing scrambling code generator polynomial based on autocorrelation function
  • Blind recognition method of self-synchronizing scrambling code generator polynomial based on autocorrelation function
  • Blind recognition method of self-synchronizing scrambling code generator polynomial based on autocorrelation function

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Embodiment Construction

[0025] The technical solution of the present invention will be described in detail below in combination with the embodiments and the accompanying drawings.

[0026] Step 1: Select a sequence of length N from the intercepted bit data of length S as the test sequence Among them, N≤S, n is the serial number of the test sequence;

[0027] Step 2: According to the formula For the test sequence selected in step 1 perform a linear transformation;

[0028] Step 3: According to the formula Calculate the second-order autocorrelation function of the test sequence after the linear transformation in step 2, and obtain M second-order autocorrelation functions R(1), R(2),...,R(M), and combine M second-order autocorrelation functions The function values ​​of functions R(1), R(2),...,R(M) are stored in an array R of length M 1 , R 1 (i)=R(i), wherein, M is a constant, 1≤i≤M, and i is an integer;

[0029] Step 4: Obtain the array R mentioned in step 3 1 Find the mean of the array R ...

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Abstract

The invention belongs to the technical field of communication, and in particular relates to a blind identification method of a self-synchronizing scrambling code generator polynomial. The blind recognition method of the self-synchronizing scrambling code generator polynomial based on the autocorrelation function includes: selecting a piece of data from the received data as a test sequence; linear transformation; setting a threshold; calculating the coefficient of the generator polynomial, etc. The method provided by the invention can only use the intercepted scrambling sequence to identify the self-synchronizing scrambling code generation polynomial under the condition of prior knowledge such as the unbalanced degree of the signal source and the self-synchronizing scrambling code series, the algorithm complexity is small, and the recognition speed is fast , high efficiency, and can still have excellent results in the case of low source imbalance and short intercepted data length, and is suitable for cooperative communication and non-cooperative communication fields.

Description

technical field [0001] The invention belongs to the technical field of communication, and in particular relates to a blind identification method of a self-synchronizing scrambling code generator polynomial. Background technique [0002] In modern digital communication systems, due to the different statistical characteristics of the information to be transmitted, it is easy to cause continuous "0" or continuous "1" in the information sequence to be transmitted, which will cause difficulties in the extraction and maintenance of synchronization. Therefore, it is necessary to randomize the information sequence, and this process is called scrambling. Commonly used scrambling techniques are synchronous scrambling and self-synchronizing scrambling. Self-synchronizing scrambling codes do not require synchronization codes and have high resource utilization, so they are often used in modern digital communication systems. [0003] In the field of non-cooperative communication, the no...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L25/03
Inventor 任春辉江楠廖红舒甘露
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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