In this letter, a new security enhancement scheme for space shift keying (SSK) systems under imperfect channel state information (CSI) is proposed. In this scheme, the legitimate receiver is always accompanied by an eavesdropper, and the secrecy enhancing of the SSK system is realized by adding the designed artificial noise (AN). Since the AN is designed by the CSI of the legitimate channel, it can be canceled at the legitimate receiver and remained at the eavesdropper. In addition, the impacts of the CSI estimation error on the secrecy rate (SR) and bit error ratio (BER) of the SSK system have also been taken into account. The simulation results show that compared with the traditional SSK under imperfect CSI environment, the proposed scheme improves the SR and BER. © 2021 Institute of Electrical Engineers of Japan. Published by Wiley Periodicals LLC.

中文翻译：

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存在不完善 CSI 估计时基于 SSK 的通信的保密性增强

在这封信中，提出了一种新的空间移位键控（SSK）系统在不完善信道状态信息（CSI）下的安全增强方案。在该方案中，合法接收者总是伴随着窃听者，SSK系统的保密增强是通过加入设计的人工噪声（AN）来实现的。由于 AN 是由合法信道的 CSI 设计的，所以它可以在合法接收者处取消并保留在窃听者处。此外，还考虑了CSI估计误差对SSK系统的保密率（SR）和误码率（BER）的影响。仿真结果表明，与不完善CSI环境下的传统SSK相比，该方案提高了SR和BER。© 2021 日本电气工程师学会。