基于混沌加密60 GHz LDPC-OFDM-ROF传输系统性能  

Performance of 60 GHz LDPC-OFDM-ROF transmission system based on chaos encryption

作　　者：席在芳[1] 谢鸿立 吴笑峰[1] 邬书跃[2] 胡仕刚[1] 唐志军[1] 

机构地区：[1]湖南科技大学信息与电气工程学院,湖南湘潭411201 [2]湖南涉外经济学院信息科学与工程学院,湖南长沙410205

出　　处：《中南大学学报（自然科学版）》2015年第11期4108-4113,共6页Journal of Central South University:Science and Technology

基　　金：国家自然科学基金资助项目(61376076;61377024);湖南省科技计划项目(2013FJ2011;2014FJ2017);湖南省教育厅科研项目(14A084;14B060)~~

摘　　要：研究并实验验证基于低密度奇偶效验码(LDPC)和Logistic混沌加密技术提高正交频分复用(OFDM)信号在60 GHz光载无线通信(ROF)系统中的传输性能以及实现系统加密性。采用非规则长LDPC纠错编码用于降低光纤链路中的色散效应,利用Logistic序列对初始条件的敏感特性作为密钥,在物理层实现对OFDM-ROF系统数据进行加密传输。研究结果表明:2.5 Gb/s 64-QAM数据在下行链路传输了30 km标准单模光纤(SSMF),当误码率(BER)为1×10^(-3)时,LDPC编码接收机灵敏度至少提高10 d B;解调端没有Logistic密钥,可得到误码星座图,验证了其加密性以及其较强的纠错能力和抗色散能力。The improved 60 GHz OFDM-ROF （orthogonal frequency division multiplexing-radio over fiber） transmission system performance was experimentally demonstrated and the encryption was realized based on LDPC coding and Logistic chaos sequence. The long irregular LDPC （low density parity check code） code was used to reduce the dispersion effect in the optical fiber link. The Logistic sequence was adopted for the secure key which is sensitive to the initial condition. A secure transmission at physical layer in OFDM-ROF system for data encrypting was achieved. The results show that 2.5 Gb/s 64-QAM data transmit 30 km SSMF in download link when the bit effort rate （BER） is 1 × 10-3, and the sensitivity of power gain is more than 10 dB. Demodulation client can get error constellation without the Logistic key, which verifies the encryption performance.

关 键 词：LDPC Logistic序列 OFDM-ROF 64-QAM 

分 类 号：TN914[电子电信—通信与信息系统]