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Analysis of Channeling-Path Phenomena in a Complex Fault-Block Reservoir with Low Recovery Factor and High Water-Cut Ratio
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作者 Qunyi Wang Xiaoli Ma +4 位作者 Yongbin Bi Haiyan He Xiao Gu Tongjing Liu Lekun Zhao 《Fluid Dynamics & Materials Processing》 EI 2023年第2期361-377,共17页
Current methods for the analysis of channeling-path phenomena in reservoirs cannot account for the influence of time and space on the actual seepage behavior.In the present study,this problem is addressed considering ... Current methods for the analysis of channeling-path phenomena in reservoirs cannot account for the influence of time and space on the actual seepage behavior.In the present study,this problem is addressed considering actual production data and dynamic characteristic parameters quantitatively determined in the near wellbore area by fitting the water-cut curve of the well.Starting from the dynamic relationship between injection and production data,the average permeability is determined and used to obtain a real-time quantitative characterization of the seepage behavior of the channeling-path in the far wellbore area.For the considered case study(Jidong oilfield),it is found that the seepage capacity of the channeling-path in the far wellbore area is far less(10 times smaller)than that of the channeling-path in the near wellbore area.The present study and the proposed model(combining near wellbore area and far wellbore area real-time data)have been implemented to support the definition of relevant adjustment measures to ultimately improve oil recovery. 展开更多
关键词 Complex fault-block reservoirs channeling path quantitative identification characteristic parameters dynamic inversion
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Channel Measurement and Path Loss Modeling from 220 GHz to 330 GHz for 6G Wireless Communications 被引量:9
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作者 Pan Tang Jianhua Zhang +7 位作者 Haoyu Tian Zhaowei Chang Jun Men Yuxiang Zhang Lei Tian Liang Xia Qixing Wang Jingsuo He 《China Communications》 SCIE CSCD 2021年第5期19-32,共14页
Terahertz(THz)communication has been envisioned as a key enabling technology for sixthgeneration(6G).In this paper,we present an extensive THz channel measurement campaign for 6G wireless communications from 220 GHz t... Terahertz(THz)communication has been envisioned as a key enabling technology for sixthgeneration(6G).In this paper,we present an extensive THz channel measurement campaign for 6G wireless communications from 220 GHz to 330 GHz.Furthermore,the path loss is analyzed and modeled by using two single-frequency path loss models and a multiplefrequencies path loss model.It is found that at most frequency points,the measured path loss is larger than that in the free space.But at around 310 GHz,the propagation attenuation is relatively weaker compared to that in the free space.Also,the frequency dependence of path loss is observed and the frequency exponent of the multiple-frequencies path loss model is 2.1.Moreover,the cellular performance of THz communication systems is investigated by using the obtained path loss model.Simulation results indicate that the current inter-site distance(ISD)for the indoor scenario is too small for THz communications.Furthermore,the tremendous capacity gain can be obtained by using THz bands compared to using microwave bands and millimeter wave bands.Generally,this work can give an insight into the design and optimization of THz communication systems for 6G. 展开更多
关键词 TERAHERTZ channel measurement channel modeling path loss
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Field trial measurement and channel modeling for reconfigurable intelligent surface 被引量:2
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作者 Peng Zheng Jianwen Ding +5 位作者 Dan Fei Jiayi Zhang Bo Ai Xiao Li Shi Jin Tiejun Cui 《Digital Communications and Networks》 SCIE CSCD 2023年第3期603-612,共10页
With the advantage of programmable electromagnetic properties,Reconfigurable Intelligent Surfaces(RISs)havedrawn wide attention from both industry and academia.RIS-assisted communication systems can promote hugewirele... With the advantage of programmable electromagnetic properties,Reconfigurable Intelligent Surfaces(RISs)havedrawn wide attention from both industry and academia.RIS-assisted communication systems can promote hugewireless channel quality improvement and remarkable coverage enhancement.This paper proposes generalpathloss model,radiation pattern and mirror beam effect of 1-bit RIS at sub-6 GHz band.Field trails have beencarried out in outdoor and indoor deployment scenarios.The proposed model is validated through extensivesimulations and field-trial measurements.In addition,an optimized RIS phase-shit design process for the mirrorbeam elimination is proposed and validated with simulations.The proposed theoretical model and measurementresults can promote future research and application in RIS-assisted communications. 展开更多
关键词 Reconfigurable intelligent surfaces channel measurement path loss PROTOTYPE
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A Fuzzy Clustering Algorithm Based on Multipath Component Trajectory for Millimeter Wave Radio Channels
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作者 Fei Du Yu Zhang +5 位作者 Qingliang Li Xinyue Zhang Bo Zhu Zihao Fu Suiyan Geng Xiongwen Zhao 《China Communications》 SCIE CSCD 2022年第11期99-111,共13页
Time-varying channel modeling plays an important role for many applications in time-variant scenarios,while most clustering algorithms focus on static channels and cannot accurately model the channel time-evolution pr... Time-varying channel modeling plays an important role for many applications in time-variant scenarios,while most clustering algorithms focus on static channels and cannot accurately model the channel time-evolution properties.In this paper,a fuzzy clustering algorithm based on multipath component(MPC)trajectory is proposed.Firstly,both the distance and velocity similarities of the MPCs in different snapshots are taken into account to track the MPC trajectory,in which the fuzzy scheme and a kernel function are used to calculate the distance and velocity similarities,respectively.Secondly,a fuzzy MPC trajectory clustering algorithm is proposed to cluster the MPCs in multiple snapshots.The MPCs in a snapshot are clustered according to the membership,which is defined as the probability that a MPC belongs to different clusters.Finally,time-varying channels at 28 GHz are simulated to validate the performance of our proposed algorithm.The results show that our proposed algorithm is able to accurately identify the clusters in time-varying channels compared with the existing clustering algorithms. 展开更多
关键词 channel modeling TIME-VARYING clustering multiple path component MPC trajectory 6G
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A Method for Identifying Channeling Paths in Low-Permeability Fractured Reservoirs
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作者 Zhenfeng Zhao Bin Li +6 位作者 Zubo Su Lijing Chang Hongzheng Zhu Ming Liu Jialing Ma Fan Wang Qianwan Li 《Fluid Dynamics & Materials Processing》 EI 2022年第6期1781-1794,共14页
Often oilfield fractured horizontal wells produce water flowing in multiple directions.In this study,a method to identify such channeling paths is developed.The dual-medium model is based on the principle of inter-wel... Often oilfield fractured horizontal wells produce water flowing in multiple directions.In this study,a method to identify such channeling paths is developed.The dual-medium model is based on the principle of inter-well connectivity and considers the flow characteristics and related channeling terms.The Lorentz curve is drawn to qualitatively discern the geological type of the low-permeability fractured reservoir and determine the channeling direction and size.The practical application of such an approach to a sample oilfield shows that it can accurately identify the channeling paths of the considered low-permeability fractured reservoir and predict production performances according to the inter-well connectivity model.As a result,early detection of water channeling becomes possible,paving the way to real-time production system optimization in low-permeability fractured reservoirs. 展开更多
关键词 Low-permeability fractured reservoir fracturing horizontal well interwell connectivity dual media channeling paths
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The Wireless Power Transmission on the Wristto-Forehead Path Based on the Body Channel
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作者 Cheng Han Linghui Kong +3 位作者 Qingya Li Shan Yu Zhiwei Zhang Jingna Mao 《Journal of Beijing Institute of Technology》 EI CAS 2022年第1期91-100,共10页
The body channel based wireless power transfer(BC-WPT)method utilizes the human body as the medium to transfer power for bioelectronics,which can achieve a lower transmission loss due to its higher conductivity.Howeve... The body channel based wireless power transfer(BC-WPT)method utilizes the human body as the medium to transfer power for bioelectronics,which can achieve a lower transmission loss due to its higher conductivity.However,except for the channel length,different on-body loca-tions of the transmitter and receiver also influence the power supply performance.This paper fo-cuses on the wrist-to-forehead path to show the potential of BC-WPT for the brain bioelectronics such as the brain computer interface device.The channel characteristics from 10 MHz to 60 MHz are measured by a vector network analyzer(VNA)and a prototype BC-WPT system with differ-ent copper electrodes and the lowest power loss locates between-22 dB and-33 dB.Furthermore,the minimum path loss limit is simulated in Advanced Design System(ADS)software and the low-est optimum path loss can reach nearly-13 dB.Finally,a rectifier circuit is also built at the receiv-er side to harvest d.c.voltage.The results show that the open-circuit voltage(OCV)can reach 1.75 V with the transmitter of 50Ωoutput impedance supplying 5V_(pp)sine voltage at 60 MHz when adopt-ing 1 cm-diameter circular electrodes. 展开更多
关键词 body channel based wireless power transfer(BC-WPT) wrist-to-forehead path chan-nel characteristics minimum path loss limit open-circuit voltage(OCV)
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LNN Blind Multi-user Detection Algorithm for Multi-path-fading CDMA Channels
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作者 李艳萍 王华奎 苗瑞清 《Defence Technology(防务技术)》 SCIE EI CAS 2006年第3期214-218,共5页
关键词 CDMA BMUD 实时追踪 LNN 通信 错误诊断
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Emulation of Realistic Multi-Path Propagation Channels inside an Anechoic Chamber for Antenna Diversity Measurements
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作者 Alaa Choumane Ahmad El Sayed Ahmad Khaled Khoder 《Wireless Engineering and Technology》 2020年第1期1-12,共12页
As antennas are inherently included recommended in Over-The-Air (OTA) testing, it is important to also consider realistic channel models for the multiple-input multiple-output (MIMO) device performance evaluation. Thi... As antennas are inherently included recommended in Over-The-Air (OTA) testing, it is important to also consider realistic channel models for the multiple-input multiple-output (MIMO) device performance evaluation. This paper aims to emulate realistic multi-Path propagation channels in terms of angles of arrivals (AoA) and cross-polarization ratio (XPR) with Rayleigh fading, inside an anechoic chamber, for antenna diversity measurements. In this purpose, a practical multi-probe anechoic chamber measurement system (MPAC) with 24 probe antennas (SATIMO SG24) has been used. However, the actual configuration of this system is not able to reproduce realistic channels. Therefore, a new method based on the control of the SG24 probes has been developed. At first time, this method has been validated numerically through the comparison of simulated and analytical AoA probability density distributions. At the second time, the performance of an antenna diversity system inside the SG24 has been performed in terms of the correlation coefficient and diversity gain (DG) using an antenna reference system. Simulated and measurements results have shown a good agreement. 展开更多
关键词 channel Emulation Multi-path OTA Measurements Antenna Diversity Measurements MIMO Correlation Coefficient Diversity Gain
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无线紫外光MIMO通信系统信道容量估算方法
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作者 赵庆 张琰 沈海莲 《激光杂志》 CAS 北大核心 2024年第4期177-181,共5页
无线紫外光通信系统易受大气散射等因素的影响,导致通信信道容量估算准确率较低。为此,提出一种无线紫外光多入多出(Multiple-Input Multiple-Output, MIMO)通信系统信道容量估算方法。根据信道特征,构建无线紫外光MIMO通信系统的信道... 无线紫外光通信系统易受大气散射等因素的影响,导致通信信道容量估算准确率较低。为此,提出一种无线紫外光多入多出(Multiple-Input Multiple-Output, MIMO)通信系统信道容量估算方法。根据信道特征,构建无线紫外光MIMO通信系统的信道容量估计模型,获取无线紫外光的单次散射传输特性,利用符号补码式的方法改进空时编码,设定高级检测器中符号的接收能耗,使每个符号保持在标准功率数值范围内,完成通信系统信道检测式编码。根据不同发射角和接收角计算无线紫外光通信的路径损耗比,通过泊松随机分布获得最终通信系统信道容量的估算结果。实验结果表明,所提方法的传输速率可高达8 Mbps,误码率始终低于10-3bit/s,估算准确率在90%以上,估计时间低于4 ms,估算效果好,可为通信行业发展提供理论依据。 展开更多
关键词 路径损耗 无线紫外光 信道容量 信噪比 信道衰减 MIMO通信系统
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蜂窝车联网侧行链路信道测量与分析
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作者 代亮 王宁 +3 位作者 白浩男 宁耀军 孟芸 许宏科 《电波科学学报》 CSCD 北大核心 2024年第2期361-370,共10页
蜂窝车联网侧行链路接口(PC5)采用终端到终端直接通信的形式,因其通信延迟低、传输容量大和传输可靠性高的特点而具备广阔的科研和工程前景。为了实测蜂窝车联网侧行链路信道特性,使用具有PC5接口的车载板卡在城市道路进行了通信测量工... 蜂窝车联网侧行链路接口(PC5)采用终端到终端直接通信的形式,因其通信延迟低、传输容量大和传输可靠性高的特点而具备广阔的科研和工程前景。为了实测蜂窝车联网侧行链路信道特性,使用具有PC5接口的车载板卡在城市道路进行了通信测量工作,并依据测量结果从信道特征对PC5接口信道进行了分析。分析了通信收包时延随距离和信噪比变化的特征,将实测参考信号接收功率值与自由空间和双射线两种路径损耗经验模型及对数距离和双斜率两种路径损耗拟合模型的预测值进行了对比,并引入了四种相关性分析算法,从数值偏移量、线性相关程度和几何形态相似度等角度分析了模型预测值与实测数据的关联性,最终验证了双斜率路径损耗模型最适合表征PC5接口通信信道在城市环境下的衰落特征,基于该模型测算得到的路径损耗指数和阴影衰落方差也进一步说明此模型能够更好地结合实验环境表征信道特性。 展开更多
关键词 蜂窝车联网 侧行链路 信道测量 路径损耗模型 相关性分析
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改进的超额抵押高吞吐量多路径支付方案
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作者 刘亚 刘雪林 +1 位作者 赵逢禹 曲博 《计算机应用研究》 CSCD 北大核心 2024年第11期3239-3244,共6页
在链下支付中,多路径支付较单路径支付在成功率和交易时延上存在显著差异。尽管Spear方案通过超额抵押显著提升了多路径支付的性能,但过多的抵押资金锁定可能对网络资金流动性造成重大影响。为解决这一问题,提出了一种改进的超额抵押高... 在链下支付中,多路径支付较单路径支付在成功率和交易时延上存在显著差异。尽管Spear方案通过超额抵押显著提升了多路径支付的性能,但过多的抵押资金锁定可能对网络资金流动性造成重大影响。为解决这一问题,提出了一种改进的超额抵押高吞吐量多路径支付方案,通过最大流算法和逼近理想解排序法优化大额支付的路径选择和资金分配问题。实验结果显示,相较于其他四种经典多路径支付方案,本方案在相同性能下减少了8%~16%的超额抵押资金,有效降低了抵押资金需求,增强了网络资金流动性。 展开更多
关键词 区块链 可扩展性 支付通道网络 超额抵押 路径选择
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基于信道带宽自调节的无线通信路径选择仿真
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作者 王善斌 韩慧 《计算机仿真》 2024年第5期246-250,共5页
无线通信的覆盖范围大、运行速度快、适用范围广,但由于通信传输信道存在时变特性,受多种干扰影响,导致易出现信号衰减问题。为增强通信稳定性,合理分配信道资源,设计一种基于信道带宽自调节的无线通信路径选择方法。将无线通信信道看... 无线通信的覆盖范围大、运行速度快、适用范围广,但由于通信传输信道存在时变特性,受多种干扰影响,导致易出现信号衰减问题。为增强通信稳定性,合理分配信道资源,设计一种基于信道带宽自调节的无线通信路径选择方法。将无线通信信道看作非线性多变量系统,计算信道输入输出响应关联,运用神经网络组建无线通信信道模型;将网络单元划分为高突发、中突发与低突发三种类型,按照统计学原理明确带宽调节区间范围,让信道带宽伴随数据传输规格变化实现自适应调制;创建通信代价函数,利用邻居节点集合确立待选节点,考虑节点剩余能量与节点转发能量损耗,将拥有最低通信代价的路径作为最优通信数据传输途径。实验结果证明,所提方法可有效提高网络吞吐量,且通信时延在0.2ms以内,具备极强的可靠性。 展开更多
关键词 信道带宽 自适应调节 通信路径选择 神经网络 通信代价
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对发挥行政复议主渠道作用的反思与制度重构
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作者 李余华 邢文心 《长春大学学报》 2024年第1期85-89,共5页
当前,我国理论界和实务界所面临的一个重大挑战是如何将行政复议作为解决行政争议的主渠道。本文分析了我国行政复议的性质,针对最新审议通过的《中华人民共和国行政复议法(修订草案)》,提出我国行政复议需要解决的问题。通过对我国行... 当前,我国理论界和实务界所面临的一个重大挑战是如何将行政复议作为解决行政争议的主渠道。本文分析了我国行政复议的性质,针对最新审议通过的《中华人民共和国行政复议法(修订草案)》,提出我国行政复议需要解决的问题。通过对我国行政复议的受案范围、复议渠道以及行政复议体制机制等方面的完善,从而实现行政复议主渠道作用,以推动行政复议真正发挥其化解行政争议的功能,为行政相对人提供更加便捷的救济途径。 展开更多
关键词 行政复议 主渠道作用 实现路径
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SC-FDMA系统的MMSE-FSE算法分析
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作者 孙亮亮 任颖 《计算机与网络》 2024年第1期89-94,共6页
单载波频分多址(Single-Carrier Frequency Division Multiple Access,SC-FDMA)系统均衡器的输入信号通常是按符号间隔进行采样的,其对抽样时间十分敏感。在短波波段,由于多径反射显著,当多径延时接近符号周期长度时,对抽样时间敏感的... 单载波频分多址(Single-Carrier Frequency Division Multiple Access,SC-FDMA)系统均衡器的输入信号通常是按符号间隔进行采样的,其对抽样时间十分敏感。在短波波段,由于多径反射显著,当多径延时接近符号周期长度时,对抽样时间敏感的缺点会被放大。针对短波信道的特征,研究了SC-FDMA系统的分数间隔均衡器(Fractional Spaced Equalizer,FSE)模型,通过与符号间隔均衡器对比发现,虽然符号间隔均衡器可以补偿接收信号的频率响应,但其对短时延衰落信道的补偿效果较差;FSE对于抽样时间的选择不敏感,在多径信道下能够获得更好的性能。链路仿真结果表明,在短时衰落信道环境下,FSE的译码性能比符号间隔均衡器有最大1.5 dB的增益。 展开更多
关键词 无线通信 多径信道 单载波频分多址 分数间隔均衡器 最小均方误差
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Effect of processing route on grain refinement in pure copper processed by equal channel angular extrusion 被引量:2
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作者 唐超兰 李豪 李赛毅 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2016年第7期1736-1744,共9页
An experimental study of the microstructures in pure copper billets processed by 8 passes of equal channel angular extrusion (ECAE) via an extended range of processing routes with a 90° die is carried out. Each... An experimental study of the microstructures in pure copper billets processed by 8 passes of equal channel angular extrusion (ECAE) via an extended range of processing routes with a 90° die is carried out. Each processing route is defined according to the inter-pass billet rotation angle (χ), which varies from 0° to 180°. According to the generation of high-angle boundaries and reduction of grain size by electron backscatter diffraction (EBSD) measurements, the grain refinement is found to be most efficient for route with χ=90°and least efficient with χ=180°, among the seven routes studied. This trend is supported by supplementary transmission electron microscopy (TEM) measurements. Comparison of the EBSD and TEM data reveals the importance of considering the non-equiaxity of grain structures in quantitative assessment of microstructural differences in ECAE-processed materials. 展开更多
关键词 pure copper equal channel angular extrusion severe plastic deformation strain path grain refinement
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基于FPGA的无人机非平稳信道动态模拟研究
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作者 房胜 毛开 +3 位作者 王满喜 华博宇 宋茂忠 朱秋明 《航空兵器》 CSCD 北大核心 2024年第1期89-96,共8页
针对无人机高速移动导致的信道状态快速时变以及多普勒频率起伏大的特点,本文基于现场可编程门阵列平台设计了无人机非平稳信道模拟方案。该方案采用调频谐波叠加方法产生非平稳信道衰落,并提出了一种信道参数实时产生算法,提高了信道... 针对无人机高速移动导致的信道状态快速时变以及多普勒频率起伏大的特点,本文基于现场可编程门阵列平台设计了无人机非平稳信道模拟方案。该方案采用调频谐波叠加方法产生非平稳信道衰落,并提出了一种信道参数实时产生算法,提高了信道模拟的实时性,保证了信道状态的实时更新。同时,针对多普勒频率起伏大导致的功率随机波动问题,本文设计了一种自适应功率均衡模块,使得输出功率最大波动仅为1.13%,保证了衰落功率的稳定性。最后,硬件消耗资源结果表明,相较于复播方案以及预存式方案,本文方案对存储资源的消耗分别降低了52.44%和9.31%,更适合长时间无人机非平稳信道衰落的模拟。同时,实测分析结果表明,相较于未均衡的模拟方案,本文硬件模拟方案输出的信道特性如路径损耗和多普勒功率谱密度与理论结果更加吻合,可用于无人机通信系统的设计、优化等领域。 展开更多
关键词 无人机 非平稳信道 信道模拟 现场可编程门阵列 路径损耗 动态场景
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Application of crystal plasticity modeling in equal channel angular extrusion 被引量:4
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作者 李赛毅 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2013年第1期170-179,共10页
Some applications of crystal plasticity modeling in equal channel angular extrusion(ECAE) of face-centered cubic metals were highlighted.The results show that such simulations can elucidate the dependency of grain r... Some applications of crystal plasticity modeling in equal channel angular extrusion(ECAE) of face-centered cubic metals were highlighted.The results show that such simulations can elucidate the dependency of grain refinement efficiency on processing route and the directionality of substructure development,which cannot be explained by theories that consider only the macroscopic deformation behavior.They can also capture satisfactorily the orientation stability and texture evolution under various processing conditions.It is demonstrated that crystal plasticity models are useful tools in exploring the crystallographic nature of grain deformation and associated behavior that are overlooked or sometimes erroneously interpreted by existing phenomenological theories. 展开更多
关键词 severe plastic deformation equal channel angular extrusion TEXTURE crystal plasticity strain path grain refinement
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基于参数映射的叶轮粗加工椭圆摆线轨迹优化
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作者 韩飞燕 顾志成 +1 位作者 赵一鹏 张传伟 《中国机械工程》 EI CAS CSCD 北大核心 2024年第3期438-444,456,共8页
为了提高复杂曲面叶轮流道开槽加工效率,提出了一种曲面粗加工摆线轨迹规划方法。首先确定流道的可加工区域并进行参数化;然后在该参数域建立以最小加工时间为优化目标的椭圆摆线轨迹关键参数的数学模型,通过区间缩小法求解出满足加工... 为了提高复杂曲面叶轮流道开槽加工效率,提出了一种曲面粗加工摆线轨迹规划方法。首先确定流道的可加工区域并进行参数化;然后在该参数域建立以最小加工时间为优化目标的椭圆摆线轨迹关键参数的数学模型,通过区间缩小法求解出满足加工要求的最佳椭圆短半轴长度与行距,从而获得参数域摆线轨迹;最后将参数域的轨迹映射至物理域来获取走刀路径。为了验证所提轨迹规划方法的高效性和有效性,以某叶轮为对象,计算了流道椭圆摆线开粗加工轨迹,并将所提方法的计算时间与传统行切法轨迹计算时间进行对比,发现计算效率提高了19.4%。此外,摆线流道开粗和行切法流道开粗的仿真加工对比结果证明,相同参数设置下所提方法的加工效率比传统行切法的加工效率高22.4%。实际摆线铣削开粗结果表明,叶轮流道切痕形状与摆线轨迹一致,表面残留满足粗加工要求,证明所提方法是有效可行的。 展开更多
关键词 参数映射 叶轮流道 椭圆摆线 刀具轨迹优化 走刀路径
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近岸海陆结合场景6 GHz以下频段无线信道测量与建模
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作者 郜帅旗 杨汨 +6 位作者 何睿斯 杨靖雅 周顺 张雪剑 刘伟荣 费丹 艾渤 《无线电通信技术》 北大核心 2024年第5期854-867,共14页
海洋通信是6G空天地海一体化网络的关键场景。海洋信道特性分析与建模对海上通信系统的技术开发和部署规划具有重要意义。关注海岸边的岸-船通信场景,介绍了在5.80、5.45、3.90、3.00 GHz频段开展的无线信道测量活动,提取并建模了岸边... 海洋通信是6G空天地海一体化网络的关键场景。海洋信道特性分析与建模对海上通信系统的技术开发和部署规划具有重要意义。关注海岸边的岸-船通信场景,介绍了在5.80、5.45、3.90、3.00 GHz频段开展的无线信道测量活动,提取并建模了岸边发射机与运动船舶之间无线链路的关键信道参数。研究发现存在于近岸区域的散射体以及沿海岸线分布的建筑群会对信道造成差异化影响。基于实测数据给出了时变抽头延迟线(Tapped Delay Line,TDL)架构参数化模型。针对多径分量丰富的近岸区采用5抽头模型,并通过设置随机时变抽头表征了场景中偶然存在的高时延多径分量。仿真结果与实测数据概率密度分布的科尔莫戈洛夫-斯米尔诺夫检验(Kolmogorov-Smirnov,K-S)统计量为0.11,KL散度为0.65,研究结果可为近岸场景岸-船通信技术的设计和部署提供参考。 展开更多
关键词 海洋信道 信道测量 路径损耗 抽头延迟线模型 信道仿真
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基于路径延迟故障序列的硬件木马检测方法
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作者 伍远翔 唐明 +1 位作者 胡一凡 张吉良 《计算机工程与设计》 北大核心 2024年第1期1-9,共9页
针对基于侧信道信号的硬件木马检测普遍面临的两类问题,即需要黄金芯片和信号测量成本大,提出一种利用路径延迟故障序列的检测方法。基于时序冲突时电路路径产生延迟故障的先后顺序,间接利用路径延迟之间相对大小关系产生芯片检测ID;检... 针对基于侧信道信号的硬件木马检测普遍面临的两类问题,即需要黄金芯片和信号测量成本大,提出一种利用路径延迟故障序列的检测方法。基于时序冲突时电路路径产生延迟故障的先后顺序,间接利用路径延迟之间相对大小关系产生芯片检测ID;检测不依赖于黄金芯片,且在大范围的环境变化和工艺偏差下具有稳定性;故障序列在芯片设计阶段仿真获得,无需额外硬件开销。对ISCAS-89基准和AES-128电路实例验证了检测的有效性,其可成功检测插入的两种类型硬件木马。 展开更多
关键词 集成电路 硬件木马 检测方法 侧信道 黄金芯片 路径延迟 故障输出
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