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Blind frame synchronization sequence estimation method

A frame synchronization and blind frame technology, applied in the field of signal processing, can solve problems such as data misjudgment and data error, and achieve the effect of effective estimation

Inactive Publication Date: 2012-06-27
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

It should be noted that although the probability statistics method can estimate the frame synchronization code, in multi-ary coding, due to the influence of noise, data misjudgment may occur in the sampling judgment of binary symbols, especially when this happens in the code When the yuan is high, the misjudgment caused by the noise will lead to a large error in the data

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  • Blind frame synchronization sequence estimation method
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  • Blind frame synchronization sequence estimation method

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Experimental program
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Embodiment

[0063] In this embodiment, computer simulation analysis is carried out by taking encoded data intercepted in actual communication as an example. The intercepted coded data length l=39970; frame length n f =200; the starting position P of the synchronization code sequence os =30; synchronization code length n s =16; bit error rate P e = 0.001. The operating system of the simulation platform is WINXP, and MATLAB is used to compile and simulate. Adopt the unknown frame length and the frame synchronization sequence detection method of starting position that the present invention proposes, wherein: assume frame length n in step 2 2 The value range is the minimum value n min =99 to max n max =201, detection threshold β=0.75 in step 3. Get different hypothetical frame length n 2 The simulation results of the synchronization code length η under Figure 5 shown.

[0064] from Figure 5 It can be seen that when assuming the frame length value n 2 =200, the synchronization co...

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Abstract

The invention provides a blind frame synchronization sequence estimation method which can satisfy a real-time processing demand of long data and ensure accuracy. The method comprises the following steps: a. symbol mapping step: carrying out symbol mapping of 1 to +1 and 0 to -1 on received frame data flow; b. data alignment degree determination step: according to a row, filling the frame data flow after the symbol mapping into matrices with different column length, and through calculating a column sum absolute mean value of each column in each matrix, determining data alignment degree in the matrices; c. synchronization code estimation step: selecting column length corresponding to a matrix with highest data alignment degree as synchronization code length, a beginning position of a continuous column with high data consistency on each row of the matrix with the highest data alignment degree is a synchronization code initial position. According to the invention, effective estimation of frame length, the initial position and a synchronization code sequence can be realized.

Description

technical field [0001] The invention belongs to signal processing technology in non-cooperative communication, and relates to frame synchronization technology in digital signal transmission process. Background technique [0002] In digital signal transmission, the performance of the synchronization system directly affects the performance of the communication system. In a synchronous communication system, "synchronization" is the prerequisite for information transmission. For the transmission data in units of frames, only when the start position of the frame and the frame synchronization code are correctly identified from the received symbol sequence, that is, only after the frame synchronization is correctly obtained, can the frame structure be further analyzed and the obtained information needed. [0003] In practical applications, data are often figure 1 The structure shown is packaged into frames, where n f Indicates the frame length, n c Indicates the information da...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L25/02H04B1/7073
Inventor 甘露魏平李立萍廖红舒
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA