一种基于物理层加密的OFDM系统设计与实现

Design and Implementation of an OFDM System Based on Physical Layer Encryption

在5G无线通信系统中,高效、快速、安全地传输信息对整个通信系统有着重大意义。针对基于计算量的现代密码学系统算法高功耗、高复杂度的特点加之其面临巨大安全挑战的背景,提出并仿真验证了一种基于物理层加密的OFDM通信系统。该系统通过加密调制联合设计,在复数域对调制后的复数信号进行等距变换,以混淆原始信号波形特征,从而达到更高的安全性。理论分析和仿真结果表明,在各种信道中,该系统在保证OFDM系统通信性能的前提下,可以实现低功耗、低复杂度、低时延的物理层加密从而有效地提高系统的安全性能。

In 5G wireless communication system,efficient,fast,and secure information transmission is of great significance to the entire communication system.Modern cryptography system based on calculated quantity has the defects of high power consumption and complexity,contributing to enormous security challenges.In allusion to these,this paper proposes and simulates an OFDM communication system based on physical layer encryption,which is jointly designed through encryption and modulation,performing isometry on modulated complex signal in complex domain to confuse the original signal waveform characteristics.Thus it could achieve higher security.Theoretical analysis and simulation results show that in various channels,the system can achieve physical layer encryption with low power consumption,low complexity and low delay on the premise of ensuring the communication performance of OFDM system,so as to effectively improve the security performance of the system.