Abstract：The security of traditional wireless communication is mainly dependent on the upper layer encryption mechanism,which cannot protect the physical layer modulation mode and the modulation information security.This paper proposes a physical layer encryption modulation method for the orthogonal frequency division multiplexing (OFDM) system.In this method,the phase random signal is used to detect and extract the equivalent channel phase information,then the 3D (Three-Dimensional) constellation is modulated in the physical layer,followed by the receiver's decryption and demodulation.The scheme makes full use of the wireless channel phase response of randomness,reciprocity and location sensibility,and this characteristic is used to enhance the safety of physical layer signal.Theoretical analysis and computer simulation results show that the algorithm is secure,and compared with the traditional QPSK (Quadrature Phase Shift Keying) modulation,the BER (Bit Error Rate) of the proposed algorithm improves about 2.5dB.This paper focuses on the physical layer security,which aims at providing a new security for the physical signal layer,and has a wide application prospect in the future 5G communications and military security communications.
李小倩, 李为, 雷菁, 程龙旺. OFDM系统中基于三维星座旋转的物理层安全加密算法[J]. 电子学报, 2017, 45(12): 2873-2880.
LI Xiao-qian, LI Wei, LEI Jing, CHENG Long-wang. A Novel Physical Layer Encryption Algorithm Based on Three Dimensional Constellation Rotation in OFDM System. Acta Electronica Sinica, 2017, 45(12): 2873-2880.
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2017, Vol. 45 
