Index Modulation Based Coordinate Interleaved Orthogonal Design for Secure Communications

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