中文摘要：

本文利用时分系统无线多径信道的互易性,提取信道相位信息作为密钥,提出一种双向中继信道的密钥生成与分发的方法。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。端节点采用正交导频设计,将双向中继信道分解为两个点对点的信道;而中继采用物理层网络编码的思想,同时广播导频以及密钥比特的异或值。这样,仅用2个时隙就实现了密钥生成与分发,还保证了密钥的安全,且无需预先进行密钥的分配。仿真结果表明,本文所提方案可以有效的实现双向中继信道的密钥生成与分发,保证了物理层的安全通信。

英文摘要：

Exploiting the reciprocity of wireless multipath channel in time division system,this paper extracts the information of channel phase as secret keys to propose a secret key generation and distribution scheme for two-way sparse multipath relay channels. The recovery algorithm based on compressive sensing theory is used for the channel estimation,because the wireless multipath channels are generally sparse. The two-way relay channel can be decomposed into two independent end to end channels by the orthogonal pilots design in the end nodes,and the relay broadcasts the pilots and the XOR of secret keys by using the physical layer network coding. By using our proposed scheme,the secret key generation and distribution can be realized in two slots,thus we can overcome the drawback of the key pre-distribution mechanism and ensure the safety of keys. Theoretical analysis and simulation results show that our proposed scheme can effectively realize the secret key generation and distribution in the two-way sparse multipath relay channel and ensure the security of the physical layer communication.