Secure Precise Wireless Transmission with Random-Subcarrier-Selection-based Directional Modulation Transmit Antenna Array
Secure Precise Wireless Transmission with Random-Subcarrier-Selection-based Directional Modulation Transmit Antenna Array
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发表时间：
2017-04
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通讯作者：
F. Shu;Xiaomin Wu;Jinsong Hu;Riqing Chen;Jiangzhou Wang
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作者：
F. Shu;Xiaomin Wu;Jinsong Hu;Riqing Chen;Jiangzhou Wang
本文提出了一种基于正交频分复用（OFDM）和定向调制（DM）的无线传输方案，即RSCS-OFDM-DM，该方案综合利用人工噪声（AN）投影、相位对准（PA）/波束形成、随机子载波选择（RSCS）等多种技术，将保密信息安全、准确地传输到期望用户。该RSCS-OFDM-DM方案为发射机和期望的接收机提供了极其低的复杂度结构，并且使得安全和精确的无线传输在实践中是可实现的。对于非法窃听者来说，机密消息的接收能力非常弱，一旦被AN破坏，他们的接收机就无法成功地拦截这些机密消息。在这种方案中，相位对准/波束形成向量和AN投影矩阵的设计密切依赖于期望的方向角和距离。特别要注意的是，RSCS的使用导致重要的结果，即机密消息的接收功率主要集中在期望接收器周围的小的相邻区域上，并且其功率的仅小部分泄漏到剩余的大的宽区域。这个概念被称为安全精确传输。推导了实时接收信干噪比（SINR）的概率密度函数。同时，得到了平均信干噪比及其紧上界。通过分析信干噪比的第一个零值位置，明确窃听区域，推导出平均保密率的近似封闭表达式。
In this paper, a practical wireless transmission scheme is proposed to transmit confidential messages to the desired user securely and precisely by the joint use of multiple techniques including artificial noise (AN) projection, phase alignment (PA)/beamforming, and random subcarrier selection (RSCS) based on OFDM, and directional modulation (DM), namely RSCS-OFDM-DM. This RSCS-OFDM-DM scheme provides an extremely low-complexity structures for the transmitter and desired receiver and makes the secure and precise wireless transmission realizable in practice. For illegal eavesdroppers, the receive power of confidential messages is so weak that their receivers cannot intercept these confidential messages successfully once it is corrupted by AN. In such a scheme, the design of phase alignment/beamforming vector and AN projection matrix depend intimately on the desired direction angle and distance. It is particularly noted that the use of RSCS leads to a significant outcome that the receive power of confidential messages mainly concentrates on the small neighboring region around the desired receiver and only small fraction of its power leaks out to the remaining large broad regions. This concept is called secure precise transmission. The probability density function of real-time receive signal-to-interference-and-noise ratio (SINR) is derived. Also, the average SINR and its tight upper bound are attained. The approximate closed-form expression for average secrecy rate is derived by analyzing the first-null positions of SINR and clarifying the wiretap region.