基于幅度和相位联合分区的无线物理层密钥生成方法

doi:10.11959/j.issn.1000-0801.2021106

Abstract

Abstract:

A key generation method based on wireless channel physical layer features is of great significance for improving security of wireless transmission.An orthogonal frequency division multiplexing (OFDM) communication system based on time division duplex (TDD) with multipath fading channels was considered.Utilizing the advantages of OFDM multicarrier and the channel reciprocity and combining the phase and amplitude information of channel frequency response (CFR), two algorithms for physical layer key generation were proposed.Theoretical analysis and experimental simulation show that the proposed algorithm has more consistent and smaller overhead in information negotiation, in addition, the proposed algorithm can increase the key length and enhance randomness, and has a better defense capability against eavesdropping and active attacks of the illegal user.

Key words: wireless communication, OFDM system, physical-layer secret key generation, security

CLC Number:

TP309

Nannan LI, Yu HAN, Ning GAO, Shi JIN. Joint amplitude and phase partition based physical layer key generation method[J]. Telecommunications Science, 2021, 37(5): 100-112.

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参数	值
信号带宽	W=10 MHz
采样频率	f_s=19.2 MHz
子载波数	K=1 024
信道模型	时延(ns):0, 310, 710, 1 090, 1 730, 2 510
	增益(dB):0, -1, -9, -10, -15, -20
	多普勒频移: 10 Hz

测试项	PAGB	算法一（均值量化幅度）	算法一（中位数量化幅度）	算法二（双阈值量化幅度）	算法二（中位数量化幅度）
Rank	0	0	0.350 485	0.534 146	0.534 146
FFT	0	0	0	0	0.213 309
NonOverlappingTemplate	0	0.534 146	0.739 918	0.911 413	0.911 413
LinearComplexity	0.213 309	0.066 882	0.739 918	0.066 882	0.739 918

Joint amplitude and phase partition based physical layer key generation method

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