CAJ | 학술논문

根据基于放大转发的双向中继信道的特性,该文利用时分系统无线多径信道的互易性和卷积运算的交换律提取密钥,使得密钥可以在信道估计时生成,而无需预先进行分配.由于信道的稀疏多径特性,采用基于压缩感知的重构算法对信道状态信息进行估计,提出了基于多径相对幅度和基于多径相对相位的密钥生成方案进行密钥的生成,并与基于多径相对时延的密钥生成方案进行了比较.仿真结果表明,3种方案均可以达到较高的密钥生成一致性,解决了第三方窃听的问题,保证了物理层通信的安全.
근거기우방대전발적쌍향중계신도적특성,해문이용시분계통무선다경신도적호역성화권적운산적교환률제취밀약,사득밀약가이재신도고계시생성,이무수예선진행분배.유우신도적희소다경특성,채용기우압축감지적중구산법대신도상태신식진행고계,제출료기우다경상대폭도화기우다경상대상위적밀약생성방안진행밀약적생성,병여기우다경상대시연적밀약생성방안진행료비교.방진결과표명,3충방안균가이체도교고적밀약생성일치성,해결료제삼방절은적문제,보증료물리층통신적안전.
According to the characteristics of two-way amplify-and-forward relay channel, this paper extracts secret key by exploiting the reciprocity of wireless multipath channel in time division system and the commutative law of convolution operation. So, the secret key can be generated with the channel estimation to overcome the drawback of the key pre-distribution mechanism. The recovery algorithm based on compressive sensing theory is used for channel estimation because of the sparsity of the wireless multipath channel. This paper proposed two new schemes based on the relative-amplitude and the relative-phase for secret key generation and compared them to the scheme based on the relative-delay. Simulation results show that all three schemes can achieve high key generation consistency probability, and present eavesdropping by the third party to ensure the security of the physical layer communication.