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Dispersive

  • Orthogonal Time–Frequency Signalin Over Doubly Dispersive Channels

    Orthogonal Time–Frequency Signalin Over Doubly Dispersive Channels,IEEE上的文章

    标签: Orthogonal Dispersive Frequency Channels

    上传时间: 2014-01-22

    上传用户:xg262122

  • Characterization of wall Dispersive and attenuative effects on UWB radar signals

    Characterization of wall Dispersive and attenuative effects on UWB radar signals

    标签: Characterization attenuative Dispersive effects

    上传时间: 2014-01-10

    上传用户:luopoguixiong

  • 一种改进的简单的电缆仿真模型

    Abstract: Nonideal cable Dispersive effects can affect system performance. This application note discusses the twomain loss effects related to cables (skin-effect and dielectric losses), and presents a simple method of modeling thecable for use in standard SPICE simulators.

    标签: 电缆仿真 模型

    上传时间: 2014-11-18

    上传用户:wxnumen

  • Time-Varying Channels

    Wireless communications has become a field of enormous scientific and economic interest. Recent success stories include 2G and 3G cellular voice and data services (e.g., GSM and UMTS), wireless local area networks (WiFi/IEEE 802.11x), wireless broadband access (WiMAX/IEEE 802.16x), and digital broadcast systems (DVB, DAB, DRM). On the physical layer side, traditional designs typically assume that the radio channel remains constant for the duration of a data block. However, researchers and system designers are increasingly shifting their attention to channels that may vary within a block. In addition to time dispersion caused by multipath propagation, these rapidly time-varying channels feature frequency dispersion resulting from the Doppler effect. They are, thus, often referred to as being “doubly Dispersive.”

    标签: Time-Varying Channels

    上传时间: 2020-06-01

    上传用户:shancjb

  • IGBT失效分析技术

    近年来,对器件的失效分析已经成为电力电子领域中一个研究热点。本论文基于现代电力电子装置中应用最广的IGBT器件,利用静态测试仪3716,SEM(Scanning Electrom Microscope,扫描电子显微镜)、EDX(Energy Dispersive X-Ray Spectroscopy、能量色散x射线光谱仪)、FIB(Focused lon beam,聚焦高子束)切割、TEM(Thermal Emmision Microscope,高精度热成像分析仪)等多种分析手段对模块应用当中失效的1GBT芯片进行电特性分析、芯片解剖并完成失效分析,并基于相应的失效模式提出了封装改进方案。1,对于栅极失效的情况,本论文先经过电特性测试完成预分析,并利用THEMOS分析出栅极漏电流通路,找到最小点并进行失效原因分析,针对相应原因提出改进方案。2,针对开通与关断瞬态过电流失效,采用研磨、划片等手段进行芯片的解剖。并用SEM与EDX对芯片损伤程度进行评估分析,以文献为参考进行失效原因分析,利用saber仿真进行失效原因验证。3,针对通态过电流失效模式,采用解剖分析来评估损伤情况,探究失效原因,并采用电感钳位电路进行实验验证。4,针对过电压失效模式,采用芯片解剖方式来分析失效点以及失效情况,基于文献归纳并总结出传统失效原因,并通过大量实验得出基于封装的失效原因,最后采用saber仿真加以验证。

    标签: igbt

    上传时间: 2022-06-21

    上传用户:1208020161