本文研究了非理想信道状态信息(channel state information,CSI)下经典4点(信源、信宿、中继、窃密者)模型的物理层保密中断性能.在此模型中,考虑窃密信道为单输入多输出,也就是信源、中继均为单天线,信宿、窃密者均为多天线.信宿和窃...本文研究了非理想信道状态信息(channel state information,CSI)下经典4点(信源、信宿、中继、窃密者)模型的物理层保密中断性能.在此模型中,考虑窃密信道为单输入多输出,也就是信源、中继均为单天线,信宿、窃密者均为多天线.信宿和窃密者均采用最大比合并分集策略处理接收到的多径信号,中继分别采用解码放大转发(decode-and-forward,DF)和随机放大转发(randomize-andforward,RF)两种方式向信宿转发信息.信源通过中继向信宿发送信息时,信源与中继、中继与信宿两跳通信过程均遭到窃密者的窃听.在非理想CSI下,本文分别推导出了DF与RF中继转发下保密中断概率的闭式表达式及渐近表达式,并通过Monte Carlo仿真验证了理论模型的正确性.展开更多
本文推导了独立不同分布Nakagami-m(m为整数)衰落信道模型下接收端采用选择合并方式时信噪比的概率密度函数(probability density function,PDF)的闭式表达式.该表达式由有限多个幂函数与指数函数乘积的求和形式组成,可作为一个非常有...本文推导了独立不同分布Nakagami-m(m为整数)衰落信道模型下接收端采用选择合并方式时信噪比的概率密度函数(probability density function,PDF)的闭式表达式.该表达式由有限多个幂函数与指数函数乘积的求和形式组成,可作为一个非常有用的数学工具来分析在独立不同分布Nakagami-m衰落信道下采用选择合并分集技术时的无线通信系统的中断概率、误符号率和遍历容量等性能,还可以用于研究物理层保密性能,比如保密中断概率(secrecy outage probability,SOP)和平均保密容量(average secrecy capacity,ASC).在单输入多输出(single-input multiple-output,SIMO)的无线通信系统中,本文以无线信息与能量同步传输(simultaneous wireless information and power transfer,SWIPT)通信系统为例,利用所得信噪比的PDF表达式研究了该系统的保密性能,进一步得到SOP和ASC的闭式表达式,最后通过数值仿真和Monte Carlo仿真对推导得到的SOP和ASC闭式表达式的准确性和有效性进行了验证.展开更多
A blind adaptive scheme is proposed for joint maximum likelihood (ML) channel estimation and data detection of singleinput multiple-output (SIMO) systems. The joint ML optimisation over channel and data is decompo...A blind adaptive scheme is proposed for joint maximum likelihood (ML) channel estimation and data detection of singleinput multiple-output (SIMO) systems. The joint ML optimisation over channel and data is decomposed into an iterative optimisation loop. An efficient global optimisation algorithm called the repeated weighted boosting search is employed at the upper level to optimally identify the unknown SIMO channel model, and the Viterbi algorithm is used at the lower level to produce the maximum likelihood sequence estimation of the unknown data sequence. A simulation example is used to demonstrate the effectiveness of this joint ML optimisation scheme for blind adaptive SIMO systems.展开更多
文摘本文研究了非理想信道状态信息(channel state information,CSI)下经典4点(信源、信宿、中继、窃密者)模型的物理层保密中断性能.在此模型中,考虑窃密信道为单输入多输出,也就是信源、中继均为单天线,信宿、窃密者均为多天线.信宿和窃密者均采用最大比合并分集策略处理接收到的多径信号,中继分别采用解码放大转发(decode-and-forward,DF)和随机放大转发(randomize-andforward,RF)两种方式向信宿转发信息.信源通过中继向信宿发送信息时,信源与中继、中继与信宿两跳通信过程均遭到窃密者的窃听.在非理想CSI下,本文分别推导出了DF与RF中继转发下保密中断概率的闭式表达式及渐近表达式,并通过Monte Carlo仿真验证了理论模型的正确性.
文摘本文推导了独立不同分布Nakagami-m(m为整数)衰落信道模型下接收端采用选择合并方式时信噪比的概率密度函数(probability density function,PDF)的闭式表达式.该表达式由有限多个幂函数与指数函数乘积的求和形式组成,可作为一个非常有用的数学工具来分析在独立不同分布Nakagami-m衰落信道下采用选择合并分集技术时的无线通信系统的中断概率、误符号率和遍历容量等性能,还可以用于研究物理层保密性能,比如保密中断概率(secrecy outage probability,SOP)和平均保密容量(average secrecy capacity,ASC).在单输入多输出(single-input multiple-output,SIMO)的无线通信系统中,本文以无线信息与能量同步传输(simultaneous wireless information and power transfer,SWIPT)通信系统为例,利用所得信噪比的PDF表达式研究了该系统的保密性能,进一步得到SOP和ASC的闭式表达式,最后通过数值仿真和Monte Carlo仿真对推导得到的SOP和ASC闭式表达式的准确性和有效性进行了验证.
文摘A blind adaptive scheme is proposed for joint maximum likelihood (ML) channel estimation and data detection of singleinput multiple-output (SIMO) systems. The joint ML optimisation over channel and data is decomposed into an iterative optimisation loop. An efficient global optimisation algorithm called the repeated weighted boosting search is employed at the upper level to optimally identify the unknown SIMO channel model, and the Viterbi algorithm is used at the lower level to produce the maximum likelihood sequence estimation of the unknown data sequence. A simulation example is used to demonstrate the effectiveness of this joint ML optimisation scheme for blind adaptive SIMO systems.