基于MIMO接收信号空间的密钥生成方案  

Secret key generation scheme based on MIMO received signal spaces

作　　者：楼洋明[1] 金梁[1] 钟州[1] 黄开枝[1] 张胜军[1] Yangming LOU Liang JIN Zhou ZHONG Kaizhi HUANG Shengjun ZHANG(China National Digital Switching System Engineering and Technological R＆D Center, Zhengzhou 450002, Chin)

机构地区：[1]国家数字交换系统工程技术研究中心,郑州450002

出　　处：《中国科学：信息科学》2017年第3期362-373,共12页Scientia Sinica(Informationis)

基　　金：国家自然科学基金(批准号:61521003);国家高技术研究发展计划(863计划)(批准号:2015AA01A708);中国博士后科学基金资助项目

摘　　要：针对现有密钥生成依赖信道参数,在信道慢变条件下,密钥生成速率不高的问题,提出一种基于MIMO系统接收信号空间的密钥生成模型.合法通信双方在当前接收信号空间中提取密钥,并通过控制发送信号的变化来提高接收信号的随机性,从而使密钥速率不受制于信道变化速度.在此基础上,提出一种密钥生成方法,使合法通信双方可以获取接收信号空间并从中随机选择相同的接收信号矢量,进而提取密钥.同时使用迭代优化的方式获得最佳的发射功率分配方式,使密钥速率最大.仿真结果表明了该密钥生成方法的有效性.Conventional secret key generation scheme cannot achieve high key generation rate when the channel characteristics change slowly. To solve this problem, a secret key generation model based on the MIMO received signal space is investigated in this paper. In this model, the legitimate transmitter and receiver distill secret keys from the received signal space, and improve the randomness of the received signals by controlling the variance of the transmitted signals, so that the update of the secret key is independent of the time variance of the wireless channel. Then a specific key generation scheme is proposed, in which the legitimate nodes can obtain the same received signal space, from which common vectors can be selected to distill the keys. In addition, an optimal power allocation method to maximize the key rate is presented. The results of the simulation confirm the effectiveness of this scheme.

关 键 词：物理层安全 密钥生成 MIMO系统 接收信号空间 功率分配 

分 类 号：TN918.4[电子电信—通信与信息系统]