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中文摘要：
传统基于信道参数的密钥生成方案在信道慢变条件下难以实现对密钥的及时更新。针对该问题,提出一种基于接收信号波形的密钥生成方案,利用发送方在测得信道的条件下,可以根据发送信号及信道参数计算出接收信号的特点,令合法通信双方从接收信号中提取密钥,使密钥在信道慢变条件下能够及时更新。同时通过在非最佳位置采样,人工引入码间串扰,使接收信号趋于高斯分布,扩大了密钥空间。仿真结果表明,在准静态及慢衰落两种慢变信道条件下,该方案性能优于传统基于信道参数的密钥生成方案。
英文摘要：
Traditional secret key generation scheme based on channel characteristics can hardly update keys in time when channel changes slowly. In this paper, a key generation method based on received signal waveforms is investigated. In the proposed method, legitimate communication parties utilize the feature that transmitter can calculate received signals from the estimated channel characteristics and transmit signals to distills keys from the received signals, so the key can be updated in time even when the channel changes slowly. By using the non-optimal sampling which leads to intersymbol interference, the probability distribution of received signals approaches to Gauss distribution and enlarge the key space. Simulation results show that the performance of proposed method is better than traditional one under the conditions of quasi-static and block-fading channels.
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