Physical-Layer Encryption in Massive MIMO Systems with Spatial Modulation

摘要

Massive multiple input and multiple output (MIMO) is a key technology of the fifth generation (5G) wireless communication sys-tems, which brings various advantages, such as high spectral efficiency and energy efficiency. In MIMO system, spatial modulation (SM) has recently emerged as a new transmission method. In this paper, in order to improve the security in SM-MIMO, a physical layer encryp-tion approach named chaotic antenna-index three-dimensional modulation and constellation points rotated (CATMCPR) encryption scheme is proposed, which utilizes the chaotic theory and spatial modulation techniques. The conven-tional physical-layer encryption in SM-MIMO suffers from spectral efficiency (SE) perfor-mance degradation and usually needs a pre-shared key, prior channel state information (CSI) or excess jamming power. By contrast, we show that the CATMCPR scheme can not only achieve securely communication but also improve above drawbacks. We evaluate the performances of the proposed scheme by an analysis and computer simulations.