In this paper, a multiple parameters weighted fractional Fourier transform(MPWFRFT) and constellation scrambling(CS) method based physical layer(PHY) security system is proposed. The proposed scheme is executed by two...In this paper, a multiple parameters weighted fractional Fourier transform(MPWFRFT) and constellation scrambling(CS) method based physical layer(PHY) security system is proposed. The proposed scheme is executed by two steps. In the first step, MPWFRFT, implemented as the constellation beguiling(CB) method, is applied to change the signal's identity. In the second step the additional pseudo random phase information, regarded as the encryption key, is attached to the original signal to enhance the security. Typically, the pseudo random phase information can be removed effectively by the legitimate receiver. In contrast to the cryptography based encryption algorithms and the conventional PHY secrecy techniques, the main contribution of the proposed scheme is concentrated on the variation in signal's characteristics. Simulation results show that the proposed scheme can prevent the exchanging signal from eavesdroppers' classifi cation or inception. Moreover, the proposed scheme can guarantee the BER performance at a tolerate increasing in computational complexity for the legitimate receivers.展开更多
单对线以太网是近年来新兴的以太网技术,随着汽车自动驾驶和工业物联网的高速发展,凭借上层应用扩展和底层布线上的绝对优势,正在大规模应用。单对线以太网物理层模拟前端技术是实现单对线以太网通信的关键基础技术。本文讲述了现有单...单对线以太网是近年来新兴的以太网技术,随着汽车自动驾驶和工业物联网的高速发展,凭借上层应用扩展和底层布线上的绝对优势,正在大规模应用。单对线以太网物理层模拟前端技术是实现单对线以太网通信的关键基础技术。本文讲述了现有单对线以太网物理层模拟前端相关的标准,架构及相关模块设计技术,重点对发射器TX和接收器RX关键模块的现有实现技术及其优缺点进行了列举分析。发射器TX电流模结构易于实现高精度但功耗效率低,电压模结构精度略低但功耗效率更高;接收器RX的设计围绕模拟数字转换器(Analog-to-Digital Converter,ADC)展开,ADC决定着整个RX的性能、功耗、面积和复杂度,分段和重新装配(Segmentation And Reassembly,SAR)ADC是首选结构,应用上限不断提高。由此进一步明确了在高性能、低功耗、小面积的单对线以太网物理层模拟前端设计中的挑战。展开更多
电力线和无线混合通信可以优势互补提升电力物联网室内覆盖的综合性能。针对无线接入和电力线中继的混合通信场景,文章提出一种适用于两跳混合中继的通用MAC层算法。综合考虑物理层信道参数和MAC层的载波侦听多路访问(carrier sense mul...电力线和无线混合通信可以优势互补提升电力物联网室内覆盖的综合性能。针对无线接入和电力线中继的混合通信场景,文章提出一种适用于两跳混合中继的通用MAC层算法。综合考虑物理层信道参数和MAC层的载波侦听多路访问(carrier sense multiple access,CSMA)退避流程,建立了该MAC层算法的跨层性能分析模型,推导了两跳传输系统归一化吞吐量以及系统时延等性能;最后仿真验证了算法有效性和模型准确性,分析了物理层和MAC层关键参数影响系统性能的机理。与Basic-RTS/CTS算法相比,所提算法可有效提升系统吞吐量和时延性能。展开更多
提出一种比特平均互信息(mean mutual information per bit,MMIB)物理层抽象技术平均互信息计算方法。该方法通过数学推导得到16QAM调制符号上各比特的对数似然比(log-likelihood ratio,LLR)的概率分布,并得到平均互信息计算解析表达式...提出一种比特平均互信息(mean mutual information per bit,MMIB)物理层抽象技术平均互信息计算方法。该方法通过数学推导得到16QAM调制符号上各比特的对数似然比(log-likelihood ratio,LLR)的概率分布,并得到平均互信息计算解析表达式。仿真结果表明,提出的计算方法计算精度要明显好于现有方法,特别是在信噪比较低时,其相对误差仅为现有算法的1/5左右,能明显改善MMIB估计性能。展开更多
基金supported by the National Basic Research Program of China under Grant 2013CB329003in part by the National Natural Science Foundation General Program of China under Grant 61171110
文摘In this paper, a multiple parameters weighted fractional Fourier transform(MPWFRFT) and constellation scrambling(CS) method based physical layer(PHY) security system is proposed. The proposed scheme is executed by two steps. In the first step, MPWFRFT, implemented as the constellation beguiling(CB) method, is applied to change the signal's identity. In the second step the additional pseudo random phase information, regarded as the encryption key, is attached to the original signal to enhance the security. Typically, the pseudo random phase information can be removed effectively by the legitimate receiver. In contrast to the cryptography based encryption algorithms and the conventional PHY secrecy techniques, the main contribution of the proposed scheme is concentrated on the variation in signal's characteristics. Simulation results show that the proposed scheme can prevent the exchanging signal from eavesdroppers' classifi cation or inception. Moreover, the proposed scheme can guarantee the BER performance at a tolerate increasing in computational complexity for the legitimate receivers.
文摘单对线以太网是近年来新兴的以太网技术,随着汽车自动驾驶和工业物联网的高速发展,凭借上层应用扩展和底层布线上的绝对优势,正在大规模应用。单对线以太网物理层模拟前端技术是实现单对线以太网通信的关键基础技术。本文讲述了现有单对线以太网物理层模拟前端相关的标准,架构及相关模块设计技术,重点对发射器TX和接收器RX关键模块的现有实现技术及其优缺点进行了列举分析。发射器TX电流模结构易于实现高精度但功耗效率低,电压模结构精度略低但功耗效率更高;接收器RX的设计围绕模拟数字转换器(Analog-to-Digital Converter,ADC)展开,ADC决定着整个RX的性能、功耗、面积和复杂度,分段和重新装配(Segmentation And Reassembly,SAR)ADC是首选结构,应用上限不断提高。由此进一步明确了在高性能、低功耗、小面积的单对线以太网物理层模拟前端设计中的挑战。
文摘电力线和无线混合通信可以优势互补提升电力物联网室内覆盖的综合性能。针对无线接入和电力线中继的混合通信场景,文章提出一种适用于两跳混合中继的通用MAC层算法。综合考虑物理层信道参数和MAC层的载波侦听多路访问(carrier sense multiple access,CSMA)退避流程,建立了该MAC层算法的跨层性能分析模型,推导了两跳传输系统归一化吞吐量以及系统时延等性能;最后仿真验证了算法有效性和模型准确性,分析了物理层和MAC层关键参数影响系统性能的机理。与Basic-RTS/CTS算法相比,所提算法可有效提升系统吞吐量和时延性能。
文摘提出一种比特平均互信息(mean mutual information per bit,MMIB)物理层抽象技术平均互信息计算方法。该方法通过数学推导得到16QAM调制符号上各比特的对数似然比(log-likelihood ratio,LLR)的概率分布,并得到平均互信息计算解析表达式。仿真结果表明,提出的计算方法计算精度要明显好于现有方法,特别是在信噪比较低时,其相对误差仅为现有算法的1/5左右,能明显改善MMIB估计性能。
