Encryption at physical layer based on chaotic system and three-dimensional modulation in massive MIMO systems

The development of massive multiple input and multiple output (MIMO) brings various advantages in the fifth generation (5G) wireless communication systems, which can achieve high spectral efficiency and energy efficiency. In this paper, considering the security and energy efficiency in massive MIMO, a physical layer security approach named chaotic antenna-index three-dimensional modulation (CATM) encryption scheme is proposed, which adds an additional dimension to the conventional two-dimensional modulation techniques. For security, the keys generated by chaotic system are used to protect information bits, antenna combination and mapping mode (ACMM). Both analytical and simulation results show that the proposed CATM scheme offers not only considerable security but also higher reliability and energy efficiency than conventional massive MIMO.