Once upon a time, cellular wireless networks provided two basic services: voice telephony and low-rate text messaging. Users in the network were separated by orthogonal multiple access schemes, and cells by generous frequency reuse patterns [1]. Since then, the proliferation of wireless services, fierce competition, andthe emergenceof new service classes such as wireless data and multimediahave resulted in an ever increasing pressure on network operators to use resources in a moreefficient manner.In the contextof wireless networks,two of the most common resources are power and spectrum—and, due to regulations, these resources are typically scarce. Hence, in contrast to wired networks, overprovisioning is not feasible in wireless networks.
标签： Maximization Nonconvex Wireless Utility Systems in
上传时间： 2020-06-01
上传用户：shancjb
For more than a century, overhead lines have been the most commonly used technology for transmitting electrical energy at all voltage levels, especially on the highest levels. However, in recent years, an increase in both the number and length of HVAC cables in the transmission networks of different countries like Denmark, Japan or United Kingdom has been observed. At the same time, the construction of offshore wind farms, which are typically connected to the shore through HVAC cables, increased exponentially.
标签： Electromagnetic Transients Cables Power in
上传时间： 2020-06-07
上传用户：shancjb
Thepredecessorvolumeofthisbookwaspublishedin1996.Intheyears since then, some things have changed and some have not. Two of the things that have not changed are the desire for better models and faster simulations. I performed the original simulations on my “hyperfast” 133-MHz computer! At the time, I thought if I could just getafastercomputer,allofourSPICEproblemswouldbehistory,right? TodayIamsimulatingonacomputerthathasa2.6-GHzprocessorwith 512 MB of RAM, and I would still say that simulations run too slow. The computer technology has evolved, but so have the models. In 1996 wewereperformingsimulationson100-kHzpowerconverters,whereas today I routinely see 1- and 2-MHz power converters.
标签： Switch-Mode Simulation Supply Power
上传时间： 2020-06-07
上传用户：shancjb
Data science is a term that the media has chosen to minimize, obfuscate, and sometimes misuse. It involves a lot more than just data and the science of working with data. Today, the world uses data science in all sorts of ways that you might not know about, which is why you need Data Science Programming All-in-One For Dummies
标签： Programming All-In-One Science Data
上传时间： 2020-06-10
上传用户：shancjb
学习Direct3D中的2D-Focus.On.2D.in.Direct3D.-.fly
标签： Direct3D D-Focus Direct fly
上传时间： 2013-08-04
上传用户：eeworm
游戏开发大全-game.programming.all.in.one
标签： programming game all one
上传时间： 2013-06-30
上传用户：eeworm
EDA Tools in FPGA用于开发FPGA的EDA工具:随着集成电路和计算机技术的发展，越来越多的公司不断的开发出更加好用的EDA工具给广大的
上传时间： 2013-04-24
上传用户：ywqaxiwang
从时域分析比较了ofdm和stbc与ofdm结合的性能差别-from time-domain analysis and comparison of OFDM stbc OFDM combined wi
上传时间： 2013-06-05
上传用户：caozhizhi
General Description The LM621 is a bipolar IC designed for commutation of brushless DC motors. The part is compatible with both three- and four-phase motors. It can directly drive the power switching devices used to drive the motor. The LM621 provides an adjustable dead-time circuit to eliminate ``shootthrough'' current spiking in the power switching circuitry. Operation is from a 5V supply, but output swings of up to 40V are accommodated. The part is packaged in an 18-pin, dual-in-line package.
上传时间： 2013-07-24
上传用户：sdq_123
·Applied Mathematics in Integrated Navigation Systems
标签： nbsp Mathematics Integrated Navigation
上传时间： 2013-07-17
上传用户：liu_yuankang
