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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.
Aiming at the problem that key generation rate is not high under the conditions of slowly changing channels, a key generation model based on received signal space of MIMO system is proposed for existing key to generate channel-dependent parameters. Extract the key and improve the randomness of the received signal by controlling the change of the transmitted signal so that the key rate is not affected by the change speed of the channel.On the basis of this, a key generation method is proposed, which enables both legitimate parties to obtain Receive the signal space and randomly select the same received signal vector, and then extract the key.At the same time, use the iterative optimization method to get the best transmission power allocation mode, and maximize the key rate.The simulation results show that the key generation method is effective Sex.