Rapid growth of wireless communication services in recent decades has created a huge demand of radio spectrum. Spectrum scarcity and utilization inefficiency limit the development of wireless networks. Cognitive radio is a promising tech- nology that allows secondary users to reuse the underutilized licensed spectrum of primary users. The major challenge for spectrum sharing is to achieve high spectrum efficiency while making non-intrusive access to the licensed bands. This requires in- formation of availability and quality of channel resources at secondary transmitters, however, is difficult to be obtained perfectly in practice.
标签： Opportunistic Spectrum Sharing
上传时间： 2020-05-31
上传用户：shancjb
This book is an outgrowth of the pioneering development work done by InterDigital Com- munication Corporation in 3rd Generation TDD WCDMA Technology. Many engineers and managers were involved in this development, which spanned a wide range of tech- nology areas, including system architecture, radio interface, radio modem design, radio resource management and hardware/software implementation. In addition, TDD WCDMA technology had many direct and indirect contributors across the globe in the context of the development of the 3GPP TDD WCDMA Standard.
上传时间： 2020-06-01
上传用户：shancjb
In the present era, low observability is one of the critical requirements in aerospace sector, especially related to defense. The stealth technology essentially relates to shaping and usage of radar absorbing materials (RAM) or radar absorbing struc- tures (RAS). The performance of such radar cross section (RCS) reduction tech- niques is limited by the bandwidth constraints, payload requirements, and other structural issues. Moreover, with advancement of materials science, the structure geometry no longer remains key decisive factor toward stealth.
标签： Fundamentals Design Radar of EM
上传时间： 2020-06-06
上传用户：shancjb
District energy (DE) systems use central heating and/or cooling facilities to provide heating and/or cooling services for communities. The advantages of district energy over conventional heating and cooling include improved efficiency, reliability and safety, reduced environmental impact, and for many situations better economics. DE systems can be particularly beneficial when integrated with cogeneration plants for electricity and heat, i.e., with combined heat and power (CHP) plants. One of the main impediments to increased use of cogeneration-based district energy is a lack of understanding of the behavior of integrated forms of such systems. This book is aimed at providing information on district energy and cogeneration tech- nologies, as well as systems that combine them.
标签： Cogeneration District Systems Energy and
上传时间： 2020-06-07
上传用户：shancjb
Recent years have seen a rapid development of neural network control tech- niques and their successful applications. Numerous simulation studies and actual industrial implementations show that artificial neural network is a good candidate for function approximation and control system design in solving the control problems of complex nonlinear systems in the presence of different kinds of uncertainties. Many control approaches/methods, reporting inventions and control applications within the fields of adaptive control, neural control and fuzzy systems, have been published in various books, journals and conference proceedings.
标签： Stable_adaptive_neural_network_co ntrol
上传时间： 2020-06-10
上传用户：shancjb
13.56MHz天线设计.pdf13.56M设计规范.pdf8-M1卡的安全问题及华东师大的应对策略.pdf8.6 谐振电路的品质因数.pptDES&RSA.pptDismantling MIFARE Classic.pdfht-ide3000.pdfMSP430 单片机与CPU 卡接口函数设计.pdfRC500-FM1702XX比较.pdfRC500天线设计资料RFID天线研究与设计.pdfRFID技术和防冲撞算法.pdfRFID电子标签防碰撞算法的研究.pdfRFID读写器天线的研究与设计.pdfRFID防碰撞技术的研究.pdf一种新颖的RFID防冲突算法.pdf低功耗无磁水表中射频卡读写器的设计.pdf基于MF RC500的RFID读写器的天线及匹配电路设计.doc基于TRF7960 读写器硬件部分设计中应注意的地方.pdf射频识别技术防碰撞算法的研究.pdf射频识别系统中的防碰撞算法设计.pdf无源电子标签读卡器防冲突检测及天线设计.pdf时隙ALOHA法在RFID系统防碰撞问题中的应用.pdf设计MF RC500 的匹配电路和天线的应用指南.pdf超高频RFID无线接口标准ISO_IEC18000_6C的研究.pdf近耦合射频识别系统的工作原理及天线设计.pdf远距离RFID天线设计.doc阻抗匹配.doc高速和资源节约型数据加密算法设计.pdf
上传时间： 2021-11-08
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硬件工程师笔试题大全及答案21页 硬件工程师笔试题大全及答案1、请列举您知道的电阻、电容、电感品牌（最好包括国内、国外品牌）。 电阻：RALEC旺诠、ROYALOHM、SUPEROHM、UniOhm、TA-I大毅、TDK、TOKEN、VISHAY、YAGEO、广东风华 电容：AVX、KEMET、Kyocera、muRata、NEC、nichicon、Panasonic、SAMSUNG、SANYO、TAIYO YUDEN、TDK、VISHAY、YAGEO、广东风华、 电感：AEM、EPCOS、ETC、Gausstek丰晶、muRata、sumida村田、Sunlord顺络、TAI-TECH台庆、TDK、TOKEN、TOREX、VISHAY、WE、YAGEO国巨、柯爱亚、科达嘉、奇力新、千如电子、捷比信、紫泰荆、肇庆英达、广东风华 2、请解释电阻、电容、电感封装的含义：0402、0603、0805。表示的是尺寸参数。 0402:40*20mil；0603:60*30mil；0805:80*50mil。 3、请问电阻、电容、电感的封装大小分别与什么参数有关？电阻封装大小与电阻值、额定功率有关；电容封装大小与电容值、额定电压有关；电感封装大小与电感量、额定电流有
标签： 硬件工程师
上传时间： 2022-03-25
上传用户：ttalli
3.96连接器 插座 MX1.25连接器Altium封装 AD封装库 2D+3D PCB封装库-25MB,Altium Designer设计的PCB封装库文件，集成2D和3D封装，可直接应用的到你的产品设计中。PCB库封装列表：PCB Library : HT-3.96连接器.PcbLibDate : 2020/6/9Time : 10:35:43Component Count :156HT3.96-LI-8PHT3.96-LI-15P-ORGHT3.96-WI-2PHT3.96-WI-2P-ORGHT3.96-WI-3PHT3.96-WI-3P-ORGHT3.96-WI-4PHT3.96-WI-4P-ORGHT3.96-WI-5PHT3.96-WI-5P-ORGHT3.96-WI-6PHT3.96-WI-6P-ORGHT3.96-WI-7PHT3.96-WI-7P-ORGHT3.96-WI-8PHT3.96-WI-8P-ORGHT3.96-WI-9PHT3.96-WI-9P-ORGHT3.96-WI-10PHT3.96-WI-10P-ORGHT3.96-WI-11PVH3.96-LI-8PVH3.96-LI-9PVH3.96-LI-10PVH3.96-LI-11PVH3.96-LI-12PVH3.96-LI-13PVH3.96-LI-14PVH3.96-LI-15PVH3.96-WI-2PVH3.96-WI-3PMX 1.25-LI-11PMX 1.25-LI-12PMX 1.25-LI-13PMX 1.25-LI-14PMX 1.25-LI-15PMX 1.25-LI-16PMX 1.25-LI-17PMX 1.25-LS-2PMX 1.25-LS-3PMX 1.25-WI-2PMX 1.25-WI-3PMX 1.25-WI-4PMX 1.25-WI-5PMX 1.25-WI-6PMX 1.25-WI-7PMX 1.25-WI-8PMX 1.25-WI-9PZH1.5-LI-13PZH1.5-LI-14PZH1.5-LI-15PZH1.5-LI-16PZH1.5-LS-2PZH1.5-LS-3PZH1.5-LS-4PZH1.5-LS-5PZH1.5-LS-6PZH1.5-LS-7P
上传时间： 2022-05-04
上传用户：
上传文件为picc18编译器。包含破解软件在内。
标签： C Compiler for pic18 mcus pro update
上传时间： 2022-05-24
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PIC单片机.SchLib - 211.00KBHT单片机.SchLib - 143.00KBAVR单片机.SchLib - 16.50KB51单片机.SchLib - 141.50KBAD元件库赠送电子学习资料及PCB案例原理图库.zip - 479.25KB三维PCB封装库.zip - 441.87MBAD库安装教程.zip - 363.56KB......
上传时间： 2022-05-26
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