物理层安全中无线信号强度的非均匀量化方案

A non-uniform quantization scheme for wireless signal strength in physical layer security

利用无线信道的互易性和随机性来生成物理层安全密钥,以保护传输数据的安全性。在给定的无线信号强度高斯分布模型下,通过数值计算推导出了理论上均匀量化的密钥匹配率,指出均匀量化是一种失配率最高的量化方案。基于此,提出了一种非均匀量化方案,将信道测量的强度量化为多个比特值,并给出相应的密钥失配率。实验和仿真结果表明,所提出的非均匀量化方案优于均匀量化方案。

The reciprocity and randomness of wireless channel are employed to generate the security key of physical layer to protect the security of transmission data.Under the given Gaussian distribution model of wireless signal strength,the uniform quantized key mismatch rate of uniform quantization scheme is derived theoretically by numerical calculation in the paper.Moreover,it is pointed out that the uniform quantization is a quantization scheme with the highest mismatch rate.To alleviate this problem,a non-uniform quantization scheme is proposed to quantize the strength of the channel measurement into multiple bit values and its corresponding mismatch rate is also given.The experimental and simulation results show that the proposed non-uniform quantization scheme is superior to the counterpart of the uniform quantization.