信道编码识别分析方法研究

发布时间：2018-01-08 11:29

本文关键词：信道编码识别分析方法研究　出处：《国防科学技术大学》2014年博士论文　论文类型：学位论文

【摘要】：信道编码的识别分析,是信息论领域的一个逆向工程问题。即在缺乏信道编码先验信息的情况下,通过一定的反演方法,依据接收到的数据流恢复出通信信号中使用的信道编码结构与参数。该课题有两个方面的可能应用:一是用于智能通信领域的链路自适应,二是非合作通信条件下的信息对抗。在链路自适应方面,发送方需要根据链路状况选择适合当前电磁环境和信道噪声的调制与编码方式。而接收方则依据接收到的信号对发送方使用的调制样式和编码参数进行识别,再进行解调和译码。在非合作通信条件下的信息对抗中,非合作接收方通常无法预知对方通信系统使用的信道编码方式,因此,也需要首先对信道编码进行识别分析,之后才能对数据进行正确的接收、译码和信息判读。本文主要围绕上述第二方面的应用,对以下几项关键技术进行深入研究。1、帧定位参数的识别分析通信系统中一般是以帧的方式实现收发双方信道编码与译码的同步。因此,帧定位信息的识别是首先需要解决的问题,包括帧的长度和每帧数据起点等信息。首先针对基于同步字的同步技术,本文给出新的帧长、帧起始点以及帧同步码的估计方法,并推广到软判决情况。同时,本文首次针对近年新出现的盲帧同步技术,给出其帧定位参数的识别方法。2、纠错编码的识别分析纠错编码是信道编码的关键,因此纠错编码的参数识别在信道编码识别分析问题中具有非常重要的地位。线性分组码是应用最为广泛的纠错编码类型之一。本文研究了若干重要纠错编码类型的参数识别问题,包括二进制循环码、Reed-Solomon码、低密度奇偶校验码和卷积码等。首先在参考了循环码的译码算法以及同行学者关于二进制循环码的重要子类——二进制Bose-Chaudhuri-Hocquenghem(BCH)码的识别分析的基础上,本文指出其中的不足并给出包括缩短码情形在内的一般二进制循环码的识别分析方法。在此基础上,将相关算法推广到Reed-Solomon码的识别分析。同时,本文首次提出软判决条件下的二进制循环码和Reed-Solomon码的编码参数识别方法。仿真结果表明,利用软判决提供的判决可靠度信息,可在同等条件下极大改善纠错编码识别分析的容错性能。对于低密度奇偶校验码,本文结合同行研究工作中的两种识别分析思路,给出一种新的、规范化的、更易快速得到准确校验矩阵的识别分析算法。卷积码是纠错编码的另一重要分支。本文首先将同行学者提出的卷积码识别分析算法加以补充和完善并给出基于软判决的识别分析算法。同时,本文针对低信噪比的应用环境提出一种新的相关攻击算法,兼有硬判决和软判决两种情形。实验结果表明,相关攻击方法特别是基于软判决的算法对卷积码识别分析的容错性能具有明显的改善。3、交织参数的识别分析在通信系统中,常采用交织编码将突发错误分散到不同的码字中,以提高纠正突发错误的能力。常用的交织编码一般分为分组交织和卷积交织两大类。本文主要针对卷积交织进行深入研究,给出一种新的、更加适应一般情况的卷积交织参数识别方法。4、信道编码识别分析的综合应用在对帧定位、纠错编码和交织编码识别分析的基础上,本文给出信道编码识别技术综合应用的一些探讨。首先,本文依据现代数字通信中信道编码的一般形式,探讨信道编码总体识别分析的方案策略。其次,给出信道识别分析方法在信息对抗中的两个应用。一是信息对抗中的电子干扰与诱骗以及网电态势感知。二是依托对信道编码识别分析技术的研究,考察信道编码中可能存在的安全漏洞,进而在信道编码上采取安全防护措施提高数据传输的保密性。
[Abstract]:Analysis and identification of channel encoding, is a reverse engineering problem in the field of information theory. In the absence of channel encoding prior information, through the inversion method, according to the received data stream to restore the structure and parameters of the channel encoding used in communication signals. The subject may have application in two aspects: is used to link adaptive intelligent communication field, the two is non cooperative communication under the condition of information warfare. In link adaptation, the sender needs to choose according to the modulation and encoding method for the electromagnetic environment and channel noise. Then the receiver and the link status of the received signal to identify the modulation and encoding parameters using the sender basis. Then the demodulation and decoding. In non cooperative communication under the conditions of information warfare, the receiver usually can not predict each other non cooperative communication system using channel coding Therefore, the way, also need to first identify the channel encoding, and then to correct the data receiving, decoding and interpreting information. This article focuses on the application of the above second aspects, in-depth study of.1 on the following key technology, frame positioning parameter identification analysis of communication system in general is to achieve synchronization between sender and receiver channel encoding and decoding in a frame. Therefore, identify the frame positioning information is the first problem to be solved, including the length of the frame and the data of each frame starting point information. Aiming at synchronization synchronization word based on the new frame length is given in this paper, the starting point and frame estimation method of frame synchronization, and extended to the soft decision. At the same time, for the first time for a new blind frame synchronization technology, propose a method to identify the parameters of the.2 positioning frame, recognition error correction encoding analysis error correction encoding is channel coding The key parameter identification code, so the error correcting encoding in channel encoding recognition analysis plays an important role in the problem. The linear block code is one of the most widely used type of error correction encoding. This paper studied the parameter identification problem of some important types of error correction encoding, including two binary cyclic codes, Reed-Solomon codes, low density parity check codes and the convolutional code. Firstly, in reference to the cyclic code decoding algorithm and peer scholars on the binary cyclic codes of important subclass of binary Bose-Chaudhuri-Hocquenghem (BCH) - based analysis of code recognition, this paper points out the shortcomings and identify general binary cyclic codes are given, including the case of shortened codes on the basis of this analysis method. The algorithm is extended to the analysis and recognition of Reed-Solomon code. At the same time, this paper first proposed the soft decision under the condition of binary cyclic codes and R Encoding parameter identification method of eed-Solomon code. The simulation results show that the reliability of the information provided by the soft decision decision, but under the same conditions greatly improve the fault-tolerant performance analysis of error correction encoding recognition. For low density parity check codes, this paper combines two kinds of recognition counterparts in the research work of analysis, we give a new specification, the more quickly get the recognition accuracy check matrix analysis algorithm. Convolutional code is another important branch of error correction encoding. This paper will give recognition to supplement and perfect and soft decision analysis algorithm based on peer scholars convolutional code recognition analysis algorithm. At the same time, this paper proposes a new algorithm for correlation attack the application environment of low SNR, both hard decision and soft decision in two cases. The experimental results show that the correlation attack method especially soft decision algorithm based on convolutional code recognition Analysis of.3 can significantly improve the fault-tolerant performance, recognize the cross analysis of parameters in a communication system, often using interleaving encoding will burst error dispersed to different code, in order to improve the ability of correcting burst errors. Interleaving encoding used is generally divided into block interleaving and convolutional interleaving two categories. In this paper, convolutional interleaver for further research, given a new, more adapt to the general situation of the convolution interleaving parameter identification method.4 comprehensive application analysis of channel encoding identification in frame alignment, based on error correction encoding and interleaving encoding recognition, some comprehensive application of encoding recognition technology is presented in this paper. On the basis of the first channel, the general form of channel encoding in modern digital communication, a scheme of the strategy analysis of channel encoding overall recognition. Secondly, given the channel identification analysis method two should be in countermeasure Use a jammer in information countermeasure and deception and network situation awareness. The two is to rely on the research on the technology of channel encoding recognition analysis, investigate potential security vulnerabilities in the channel encoding, and then take safety protection measures in improving data transmission channel encoding confidentiality.

【学位授予单位】：国防科学技术大学
【学位级别】：博士
【学位授予年份】：2014
【分类号】：TN911.22

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