窄带信道中基于接收信号相位的密钥容量研究

doi:10.3969/j.issn.1000-3428.2014.07.025

计算机工程

窄带信道中基于接收信号相位的密钥容量研究

蔡文炳，张水莲

(解放军信息工程大学信息系统工程学院，郑州 450002)

收稿日期:2013-02-20 出版日期:2014-07-15 发布日期:2014-07-14
作者简介:蔡文炳(1988－)，男，硕士研究生，主研方向：信号处理；张水莲，教授。
基金项目:
国家“863”计划基金资助项目(2009AA011205)。

Research on Secret Key Capacity Based on Phase of Received Signals in Narrowband Channel

CAI Wen-bing, ZHANG Shui-lian

(Institute of Information System Engineering, PLA Information Engineering University, Zhengzhou 450002, China)

Received:2013-02-20 Online:2014-07-15 Published:2014-07-14

摘要/Abstract

摘要： 无线信道具有互易性、时变性和空变性等特点，合法双方可以利用无线信道的特性生成共享密钥。基于此，提出一种密钥容量的求解方法。对窄带信道中基于相关随机源模型的窃听信道进行合理建模，利用信息论及随机信号分析理论，对基于接收信号相位信息的密钥容量进行推导，得到密钥容量的表达式。仿真结果表明，密钥容量随信噪比与合法双方信道相关系数的增大而增大，且基于接收信号相位的密钥容量小于基于接收信号的密钥容量，因此，合法双方为得到更长的密钥，可以进行接收信号包络、相位信息的联合提取。

关键词: 平坦衰落信道, 密钥生成, 信道建模, 相关随机源, 相位信息, 密钥容量

Abstract: Wireless channel is of reciprocity, temporal variability and spatial variability. The legitimate users can generate secret key based on the property of the wireless channel. This paper proposes a calculation method for the capacity of the secret key. It establishes a reasonable wiretap channel model based on source of correlated randomness in the narrowband channel. The secret key capacity based on the phase of the received signal is deduced and the corresponding analytical expressions is obtained utilizing information theory and random signal processing theory on the basis of established channel model. The simulation results demonstrate that the secret key capacity is increased with the reciprocal extent of the channels between legitimate users and the SNR of received signals and the secret key capacity based on the phase information is smaller than the capacity based on received signals. Therefore, the legitimate users can apply the joint information distillation of envelope and phase in received signals to get more secret key bits.

Key words: flat fading channel, secret key generation, channel modeling, source of correlated randomness, phase information, secret key capacity

中图分类号:

TN911.2

蔡文炳，张水莲. 窄带信道中基于接收信号相位的密钥容量研究[J]. 计算机工程, doi: 10.3969/j.issn.1000-3428.2014.07.025.

CAI Wen-bing, ZHANG Shui-lian. Research on Secret Key Capacity Based on Phase of Received Signals in Narrowband Channel[J]. Computer Engineering, doi: 10.3969/j.issn.1000-3428.2014.07.025.

参考文献

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窄带信道中基于接收信号相位的密钥容量研究

Research on Secret Key Capacity Based on Phase of Received Signals in Narrowband Channel

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