单载波频域均衡系统中基于信道频域响应的密钥生成机制研究  

Study on Secret Key Generation Based on Frequency Domain Response of Channel in Single Carrier Frequency Domain Equalization Systems

作　　者：孔媛媛[1] 杨震[1] 吕斌[1] 田峰[1] KONG Yuanyuan;YANG Zhen;Lü Bin;TIAN Feng(Key Laboratory of Broadband Wireless Communication and Sensor Network Technology,Ministry of Education,Nanjing University of Posts and Telecommunications,Nanjing 210003,China)

机构地区：[1]南京邮电大学宽带无线通信与传感网技术教育部重点实验室,南京210003

出　　处：《电子与信息学报》2018年第5期1017-1023,共7页Journal of Electronics & Information Technology

基　　金：国家自然科学基金(61671252;61772287);江苏省高校自然科学研究重大项目(14KJA510003);江苏省研究生科研与实践创新计划(CXZZ11_0394)~~

摘　　要：单载波频域均衡(SC-FDE)系统中,信道的频域响应可以作为随机源来生成密钥。为了提高密钥容量,该文提出一种利用多径瑞利信道的频域响应来生成密钥的机制(CFR-Key)。首先研究了CFR-Key机制的原理和密钥生成速率,通过互信息理论推导出了CFR-Key的密钥容量;进而研究了CFR-Key机制中算法的量化等级的影响因素,推导验证了量化等级的选择只与信噪比有关,当信噪比确定的情况下通过选择最优的量化等级可以得到最大的密钥生成速率;与基于信道冲激响应生成密钥机制(CIR-Key)对比,证实了CFR-Key机制可大幅提高密钥容量。A secret key generation scheme is proposed in a Single Carrier Frequency Domain Equalization system （SC-FDE）. The scheme uses the Channel Frequency Response （CFR） to generate the secret keys, which is termed as CFR-Key. The principle of the CFR-Key scheme is introduced and formulate the secret key capacity is derived based on mutual information theory. The Signal-Noise Ratio （SNR） is proved that is the unique factor and affects the quantization levels. The optimum quantization levels is designed to achieve the best key generation rate when SNR is given. Simulation results show that comparing with the secret key generation scheme based on the Channel Impulse Response （CIR-Key）, the proposed scheme can significantly improve the secret key capacity.

关 键 词：密钥生成 信道频域响应 单载波频域均衡系统 

分 类 号：TN92[电子电信—通信与信息系统]