In this paper, we propose a physical layer security scheme that exploits a novel index modulation (IM) technique for coordinate interleaved orthogonal designs (CIOD). Utilizing the diversity gain of CIOD transmission, the proposed scheme, named CIOD-IM, provides an improved spectral efficiency by means of IM. In order to provide a satisfactory secrecy rate, we design a particular artificial noise matrix, which does not affect the performance of the legitimate receiver, while deteriorating the performance of the eavesdropper. We derive expressions of the ergodic secrecy rate and the theoretical bit error rate upper bound. In addition, we analyze the case of imperfect channel estimation by taking practical concerns into consideration. It is shown via computer simulations that the proposed scheme outperforms the existing IM-based schemes and might be a candidate for future secure communication systems.

翻译：在本文中,我们提出一个物理层安全计划,利用一种新型指数调制(IM)技术来协调断裂正对形设计(CIOD)的协调。利用COOD传输的多样化收益,拟议方案称为CIOD-IM,通过IM提供了更好的光谱效率。 为了提供令人满意的保密率,我们设计了一个特定的人工噪音矩阵,它不影响合法接收器的性能,同时使窃听器的性能恶化。我们从中获取了ergodic保密率和理论比特误率的表达方式。此外,我们通过考虑实际问题,分析了不完善的频道估计情况。通过计算机模拟显示,拟议的计划优于现有的IM-计划,并可能成为未来安全通信系统的候选者。