In the nineteenth century, scientists, mathematician, engineers and innovators started investigating electromagnetism. The theory that underpins wireless communications was formed by Maxwell. Early demonstrations took place by Hertz, Tesla and others. Marconi demonstrated the first wireless transmission. Since then, the range of applications has expanded at an immense rate, together with the underpinning technology. The rate of development has been incredible and today the level of technical and commercial maturity is very high. This success would not have been possible without understanding radio- wave propagation. This knowledge enables uS to design successful systems and networks, together with waveforms, antennal and transceiver architectures. The radio channel is the cornerstone to the operation of any wireless system.
标签： LTE-Advanced Generation Next and
上传时间： 2020-05-27
上传用户：shancjb
In recent years, the research and developments in the area of RF and microwave technologies have progressed significantly due to the growing demand for applica- bility in wireless communication technologies. Starting from 1992, wireless com- munication technologies have become quite mature. In the modern era of electronic developments, design of wireless handsets is an example of integration of many di- verse skill sets. Classical books in the areas of microwave technology provide uS with an in-depth knowledge of electromagnetic fundamentals.
标签： Front-Ends Receiver Modern
上传时间： 2020-05-31
上传用户：shancjb
An understanding of the policies, regulations, standards and techniques of radio spectrum management is uSeful to those who manage and administrate it, to operators, to equipment providers and to the uSers of wireless communication (i.e., all of uS). For many years the author has been deeply involved in ruling the RF spectrum at the national, regional and global levels. The book is based on the professional experience of the author, his academic courses, presenta- tions and tutorials in five continents. The book reflects this legacy and will be of uSe to engineers, lawyers and economists, who serve the global induStry of the wireless world; in it they may find solutions to the problems they frequently encounter.
标签： Management Spectrum Radio
上传时间： 2020-06-01
上传用户：shancjb
Each of uS is interested in optimization, and telecommunications. Via several meetings, conferences, chats, and other opportunities, we have discovered these joint interests and decided to put together this book.
标签： Telecommunications optimization heuristics
上传时间： 2020-06-01
上传用户：shancjb
学习和掌握DAC0832的工作原理与编程，利用ProteuS ISIS绘制DAC0832电路原理图，
上传时间： 2020-06-01
上传用户：fhdjdjdhj
The information age is exploding around uS, giving uS access to dizzying amounts of data the instant it becomes available. Smart phones and tablets provide an untethered experience that offers stream- ing video, audio, and other media formats to juSt about any place on the planet. Even people who are not “computer literate” uSe Facebook to catch up with friends and family, uSe Google to research a new restaurant choice and print directions to get there, or Tweet their reactions once they have sampled the fare. The budding Internet-of-things will only catalyze this data eruption. The infrastructure supporting these services is also growing exponentially, and the technology that facilitates this rapid growth is virtualization.
上传时间： 2020-06-01
上传用户：shancjb
从 IO0（接⼝地址为 8000H）读取开关信息，从 IO1（接⼝地址为 8800H） 输出控制灯亮灭。开关闭合则 D1 灯点亮，开关断开则 D1 灯灭。
标签： 微机原理；编程
上传时间： 2020-06-02
上传用户：appleapple
Thanks to the advances in micromachining fabrication technologies and significant cost reduction due to mass production, miniature sensors of angular rate, or gyroscopes, found their way into the everyday life of every uSer of modern gadgets, such as smart phones, tablets or even wristwatches. Often without realising, many of uS are carrying in our pockets fully equipped with all necessary sensors complete inertial navigation systems that not so long ago were available only for advanced vehicles in sea, land, air or space. Accelerometers and gyroscopes are found in specifications of any gadget supposed to react to uSer movements. And one of the most commonly uSed type of gyroscopes uSed to developed these systems is Coriolis vibratory gyroscope (CVG).
标签： Gyroscopes Vibratory Coriolis
上传时间： 2020-06-06
上传用户：shancjb
n its Framework and Roadmap for Smart Grid Interoperability Standards, the uS National Institute of Standards and Technology declares that a twenty-first-century clean energy economy demands a twenty-first-century electric grid. 1 The start of the twenty-first century marked the acceleration of the Smart Grid evolution. The goals of this evolution are broad, including the promotion of widespread and distributed deployment of renewable energy sources, increased energy efficiency, peak power reduction, automated demand response, improved reliability, lower energy delivery costs, and consumer participation in energy management.
上传时间： 2020-06-07
上传用户：shancjb
December 2007, San Jose, California: It seems a long time ago. I walked into a big networking company to head their small Power over Ethernet (PoE) applications team. Surprisingly, I hardly knew anything about PoE prior to that day, having been a switching-power conversion engineer almost all my life. But it seemed a great opportunity to widen my horizons. As you can see, one notable outcome of that seemingly illogical career choice five years ago is the book you hold in your hands today. I hope this small body of work goes on to prove worthy of your expectations and also of all the effort that went into it. BecauSe, behind the scenes, there is a rather interesting story to relate—about its backdrop, intertwined with a small slice of modern PoE history, punctuated by a rather res- tive search for our roots and our true heroes, one that takes uS back almost two centuries
上传时间： 2020-06-07
上传用户：shancjb
