A Robust Secure Transmission Scheme Based onArtificial Noise for Resisting Active Eavesdropper in MIMO Heterogeneous Networks
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摘要: 为保证MIMO异构网络面临多天线主动窃听时的安全性，该文提出一种基于人工噪声的抗主动窃听者的鲁棒安全传输方案。首先，考虑窃听者发送上行导频干扰的情形，研究了其发送的上行导频干扰对合法用户信道估计的影响。随后，基于信道估计结果对宏基站、微基站的下行数据与噪声信号的预编码矩阵进行设计，并推导了此种情形下系统安全速率的表达式。然后，以系统安全速率最大化为目标对基站的下行数据与噪声信号的发送功率进行优化设计，并提出一种基于1维线性搜索的求解方法。进一步地，考虑窃听者在发送上行导频干扰后，继而发送噪声干扰用户下行通信的情形，提出一种基于离散零和博弈方法来获取最优的发送功率设计。仿真结果验证了所提方案的安全性和鲁棒性。Abstract: To ensure the security of MIMO heterogeneous networks while facing the active multi-antenna eavesdropping, a robust secure transmission scheme based on artificial noise is proposed. Firstly, considering that the eavesdropper sends uplink pilot interference signal, the influence of uplink pilot interference on the channel estimation of legitimate users is studied. Then, based on the channel estimation results, the precoding matrix of downlink data and noise signals of macro base station and micro base station are designed, respectively. The expression of system security rate in this case is derived; After that, for maximizing the system security rate, the transmission power of downlink data and noise signal of base station are optimized, and a solution method based on one-dimensional linear search is proposed. Furthermore, considering the situation that the eavesdropper sends the uplink pilot interference and then sends the noise to interfere with the downlink communication of the legitimate user, a discrete zero-sum game method is proposed to obtain the optimal transmission power design. The simulation results verify the security and robustness of the proposed scheme.
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