16qam 随着现代通信技术的发展， 特别是移动通信技术高速发展， 频带利用率问题 越来越被人们关注。 在频谱资源非常有限的今天， 传统通信系统的容量已经不能 满足当前用户的要求。正交幅度调制 QAM(Quadrature Amplitude Modulation) 以其高频谱利用率、 高功率谱密度等优势， 成为宽带无线接入和无线视频通信的 重要技术方案。 随着现代通信技术的发展， 特别是移动通信技术高速发展， 频带利用率问题 越来越被人们关注。 在频谱资源非常有限的今天， 传统通信系统的容量已经不能 满足当前用户的要求。正交幅度调制 QAM(Quadrature Amplitude Modulation) 以其高频谱利用率、 高功率谱密度等优势， 成为宽带无线接入和无线视频通信的 重要技术方案。
上传时间： 2016-06-26
上传用户：guh000
PDF打印程序，安装和使用都非常方便，而且支持各种操作系统。我已在好几种系统中用过
标签： PDF打印
上传时间： 2019-01-11
上传用户：pau008
2018专升本操作系统综合实践题目参考
上传时间： 2019-06-17
上传用户：aaaaa123
The concept of “smart city” is often used implying that the reader has a clear and common notion of what it means. However, in the current literature it is very hard to find a precise definition. What is even more interesting, it is not so easy to find a precise definition of what a city is.
标签： Facilitating Developing Designing Cities Smart
上传时间： 2020-05-25
上传用户：shancjb
The objective of this book is to allow the reader to predict the received signal power produced by a particular radio transmitter. The first two chapters examine propagation in free space for point-to-point and point-to-area transmission, respectively. This is combined with a dis- cussion regarding the characteristics of antennas for various purposes. In chapter 3, the effect of obstacles, whether buildings or mountains, is discussed and analytical methods, whereby the strength of a signal is the shadow of an obstacle can be predicted, are presented.
标签： Propagation Essentials Radio Wave of
上传时间： 2020-05-27
上传用户：shancjb
This book is an entry-level text on the technology of telecommunications. It has been crafted with the newcomer in mind. The twenty-one chapters of text have been prepared for high-school graduates who understand algebra, logarithms, and the basic principles of electricity such as Ohm’s law. However, it is appreciated that many readers require support in these areas. Appendices A and B review the essentials of electricity and mathematics up through logarithms. This material was placed in the appendices so as not to distract from the main theme, the technology of telecommunication systems. Another topic that many in the industry find difficult is the use of decibels and derived units. Appendix C provides the reader a basic understanding of decibels and their applications. The only mathematics necessary is an understanding of the powers of ten
标签： Telecommunications Fundamentals 2nd of ed
上传时间： 2020-05-27
上传用户：shancjb
Fundamentals of WiMAX was consciously written to appeal to a broad audience, and to be of value to anyone who is interested in the IEEE 802.16e standards or wireless broadband networks more generally. The book contains cutting-edge tutorials on the technical and theoretical under- pinnings to WiMAX that are not available anywhere else, while also providing high-level over- views that will be informative to the casual reader.
标签： Understanding Fundamentals WiMAX of
上传时间： 2020-05-27
上传用户：shancjb
We were on the lookout for ice. I was in a 32 foot sailing yacht with writer and explorer Tristan Gooley, undertaking a double-handed sail from Scotland through the Faroes up to 66 33 45.7 N and the midnight sun. Now sailing out of the Arctic Circle we were approaching Iceland from the north, heading for the Denmark Straits, where ice flowed south. The Admiralty Pilot warned of bergs but the ice charts we had sailed with were over a week old. We needed an update.
标签： Interference Analysis
上传时间： 2020-05-27
上传用户：shancjb
The aim of this book is to give an integrated presentation of the specifications for Long Term Evolution (LTE) and LTE Advanced radio interfaces, so that the reader can gain an overview of their main characteristics.
上传时间： 2020-05-27
上传用户：shancjb
With this book at your fingertips, you, the reader, and I have something in common. We share the same interest in mobile radio channels. This area attracted my interest first in autumn 1992 whenImovedfromindustrytoacademiatofindachallengeinmylifeandtopursueascientific career. Since then, I consider myself as a student of the mobile radio channel who lives for modelling, analyzing, and simulating them. While the first edition of this book resulted from my teaching and research activities at the Technical University of Hamburg-Harburg (TUHH), Germany, the present second edition is entirely an outcome of my work at the University of Agder, Norway.
上传时间： 2020-05-30
上传用户：shancjb
