16qam 隨著現代通信技術的發展， 特別是移動通信技術高速發展， 頻帶利用率問題 越來越被人們關注。 在頻譜資源非常有限的今天， 傳統通信系統的容量已經不能 滿足當前用戶的要求。正交幅度調制 QAM(Quadrature Amplitude Modulation) 以其高頻譜利用率、 高功率譜密度等優勢， 成為寬帶無線接入和無線視頻通信的 重要技術方案。 隨著現代通信技術的發展， 特別是移動通信技術高速發展， 頻帶利用率問題 越來越被人們關注。 在頻譜資源非常有限的今天， 傳統通信系統的容量已經不能 滿足當前用戶的要求。正交幅度調制 QAM(Quadrature Amplitude Modulation) 以其高頻譜利用率、 高功率譜密度等優勢， 成為寬帶無線接入和無線視頻通信的 重要技術方案。
上傳時間： 2016-06-26
上傳用戶：guh000
PDF打印程序，安裝和使用都非常方便，而且支持各種操作系統。我已在好幾種系統中用過
標簽： PDF打印
上傳時間： 2019-01-11
上傳用戶：pau008
2018專升本操作系統綜合實踐題目參考
上傳時間： 2019-06-17
上傳用戶：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.
標簽： Facilitating Developing Designing Cities Smart
上傳時間： 2020-05-25
上傳用戶：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.
標簽： Propagation Essentials Radio Wave of
上傳時間： 2020-05-27
上傳用戶：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
標簽： Telecommunications Fundamentals 2nd of ed
上傳時間： 2020-05-27
上傳用戶：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.
標簽： Understanding Fundamentals WiMAX of
上傳時間： 2020-05-27
上傳用戶：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.
標簽： Interference Analysis
上傳時間： 2020-05-27
上傳用戶：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.
上傳時間： 2020-05-27
上傳用戶：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.
上傳時間： 2020-05-30
上傳用戶：shancjb
