Guaranteeing Wireless Communication Secrecy via a WFRFT-Based Cooperative System  

作　　者：Fang Xiaojie Sha Xuejun Mei Lin 

机构地区：[1]Communication Research Center, Harbin Institute of Technology

出　　处：《China Communications》2015年第9期76-82,共7页中国通信（英文版）

基　　金：supported by the National Basic Research Program of China under Grant 2013CB329003;the National Natural Science Founda-tion General Program of China under Grant 61171110

摘　　要：In this paper, a weighted fractional Fourier transform(WFRFT) based cooperative overlay system, aiming to guarantee physical layer(PHY) security, is proposed. The paper elaborates how WFRFT and physical layer properties of the wireless medium are collaborated to guarantee the secrecy of wireless transmissions. In the proposed system, WFRFT is first preform on the secret data, such that the transmitted signal is distorted and can only be neutralized by inverse-WFRFT with the same parameter. And then two streams of the transformed sequences that bearing different messages are cooperatively and simultaneously transmitted to two legitimate receivers via a beamforming-liked method, respectively. In general, both the rapid spatial decorrelation property and the inherent security features of WFRFT are leveraged, such that only the eavesdropper's is degraded, and hence, the wireless communication secrecy is reliably guaranteed. Numerical simulations are conducted to evaluate the performance of the proposed system in terms of the average bit error rate and the secrecy capacity.In this paper, a weighted fractional Fourier transform（WFRFT） based cooperative overlay system, aiming to guarantee physical layer（PHY） security, is proposed. The paper elaborates how WFRFT and physical layer properties of the wireless medium are collaborated to guarantee the secrecy of wireless transmissions. In the proposed system, WFRFT is first preform on the secret data, such that the transmitted signal is distorted and can only be neutralized by inverse-WFRFT with the same parameter. And then two streams of the transformed sequences that bearing different messages are cooperatively and simultaneously transmitted to two legitimate receivers via a beamforming-liked method, respectively. In general, both the rapid spatial decorrelation property and the inherent security features of WFRFT are leveraged, such that only the eavesdropper＇s is degraded, and hence, the wireless communication secrecy is reliably guaranteed. Numerical simulations are conducted to evaluate the performance of the proposed system in terms of the average bit error rate and the secrecy capacity.

关 键 词：weighted fractional Fourier trans-form（WFRFT） physical layer（PHY） security secrecy capacity 

分 类 号：TN918.82[电子电信—通信与信息系统]