相关衰落信道上WCDMA系统的安全性能分析

doi:10.11959/j.issn.1000-0801.2018190

摘要/Abstract

摘要：

对多输入多输出（MIMO）相关衰落信道上宽带码分多址接入（WCDMA）的安全性能进行评估，一种省时高效的解决方案是理论分析法。推导了相关 Nakagami 衰落信道上采用空时分组码和二维瑞克接收机（2D-Rake）的 WCDMA 系统的非零安全容量概率和安全中断概率的精确解析表达式。利用上述表达式，可以快速地评估收发天线数、天线相关系数、Nakagami衰落系数、平均路径衰减系数等参数对WCDMA系统安全性能造成的影响。数值计算和仿真结果相吻合，证明了以上理论分析的正确性。推导了WCDMA系统渐近安全中断概率的解析表达式。结果表明，WCDMA 系统的安全分集增益为主信道各个可分离路径上的分集增益之和，与窃听信道无关；对于恒定多径强度轮廓的同分布Nakagami衰落信道，WCDMA系统的安全分集增益为主信道的收/发天线数、多径个数以及Nakagami衰落系数四者之积。

关键词: 物理层安全, 宽带码分多址接入, 相关Nakagami衰落信道, 二维瑞克接收机, 安全中断概率

Abstract:

In order to evaluate the security performance of wideband code division multiple access (WCDMA) over multiple-input and multiple-output fading channels,a time-saving and efficient solution is theoretical analysis.The exact analytical expressions of the non-zero security capacity probability and the security outage probability of WCDMA systems using space-time block codes and 2D Rake receivers (2D-Rake) on the relevant Nakagami fading channels was deduced.Using the above expressions,the effects of parameters such as the number of transmit and receive antennas,antenna correlation coefficient,Nakagami fading coefficient,and average path attenuation coefficient on the security performance of the WCDMA system could be quickly evaluated.The numerical calculation was in good agreement with the simulation results,which proved the correctness of the above theoretical analysis.The analytical expression of the asymptotic safety outage probability of WCDMA system was deduced.The results show that the security diversity gain of WCDMA system is the sum of the diversity gains on the separable paths of the main channel,and has nothing to do with the eavesdropping channel; the same for the constant multipath intensity profile The Nakagami fading channel is distributed,and the security diversity gain of the WCDMA system is the product of the number of received and transmitted antennas of the primary channel,the number of multipaths,and the Nakagami fading coefficient.

Key words: physical layer security, wideband code division multiple access, correlated Nakagami fading channel, two-dimension Rake receiver, secrecy outage probability

中图分类号:

TN918.1

李光球,王占湾,任婷洁,刘帅帅. 相关衰落信道上WCDMA系统的安全性能分析[J]. 电信科学, 2018, 34(10): 9-17.

Guangqiu LI,Zhanwan WANG,Tingjie REN,Shuaishuai LIU. Secure performance analysis of WCDMA systems over correlated Nakagami fading channels[J]. Telecommunications Science, 2018, 34(10): 9-17.

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