基于扰乱矩阵的LDPC-COFDM安全系统的设计与研究

发布时间：2018-01-10 16:12

本文关键词：基于扰乱矩阵的LDPC-COFDM安全系统的设计与研究　出处：《西北大学》2017年硕士论文　论文类型：学位论文

【摘要】：随着无线通信技术朝着宽带化和融合化的方向不断发展,其所面临的安全威胁也越来越严重,传统的链路层安全机制不能从根本上保护无线通信系统的安全,因此物理层安全,尤其是如何降低安全界成为现阶段人们研究的热点。本文通过详细介绍LDPC-COFDM系统原理及关键技术,给出了用于研究系统安全界的LDPC-COFDM系统基带模型和仿真模型;在此基础上,通过设计信息扰乱矩阵、反格雷码映射方式以及性能优异的LDPC编译码方法,提出了一种基于扰乱矩阵的LDPC-COFDM安全系统(简称SC-LDPC-COFDM系统)方案。仿真分析结果表明,本文设计的SC-LDPC-COFDM系统在付出的信噪比代价小于0.5dB的同时,在译码迭代次数为10次、安全等级为0.4时,AWGN信道下安全界为0.95dB,EVA多径信道下安全界为1.5dB,ETU多径信道下安全界为1.7dB,EVA多径信道下安全界为5dB;该方案可以很好的适应不同LDPC码长、星座映射方式、子载波个数;该方案取得的安全界结果接近于实用化的水平。
[Abstract]:With the development of wireless communication technology in the broadband and the integration of the development direction of the security threats facing more and more serious, the traditional link layer security mechanism can not protect the wireless communication system is fundamentally safe, so the physical layer security, especially how to reduce the security has become a focus of research at the present stage. This paper introduces the principle and key technology of LDPC-COFDM system, LDPC-COFDM system for baseband model and simulation model of the system security is given; on this basis, through the design of anti disturb information matrix, gray code mapping method and the excellent performance of LDPC encoding and decoding method, proposed a LDPC-COFDM security system based on matrix disturb (SC-LDPC-COFDM system) scheme. The simulation results show that the SC-LDPC-COFDM system designed in this paper is less than 0.5dB at the same time pay the SNR in price. The iteration is 10 times, the security level for the 0.4, AWGN channel security 0.95dB, EVA multipath channel security 1.5dB, ETU multipath channel security 1.7dB, EVA multipath channel security is 5dB; the scheme can well adapt to the different LDPC code length, constellation mapping mode. The number of subcarriers; the scheme has the security sector results are close to the practical level.

【学位授予单位】：西北大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN92

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