The new digital radio system DAB (Digital Audio Broadcasting, nowadays often called Digital Radio) is a very innovative and UniveRSal multimedia broadcast system which will replace the existing AM and FM audio broadcast services in many parts of the world in the future. It was developed in the 1990s by the Eureka 147/DAB project. DAB is very well suited for mobile reception and provides very high robustness against multipath reception. It allows use of single frequency networks (SFNs) for high frequency efficiency.
标签： Broadcasting Principles Digital Audio
上传时间： 2020-05-27
上传用户：shancjb
The next-generation wireless broadband technology is changing the way we work, live, learn, and communicate through effective use of state- of-the-art mobile broadband technology. The packet-data-based revolu- tion started around 2000 with the introduction of 1x Evolved Data Only (1xEV-DO) and 1x Evolved Data Voice (1xEV-DV) in 3GPP2 and High Speed Downlink Packet Access (HSDPA) in 3GPP. The wireless broad- band fourth-generation technology (4G) is an evolution of the packet- based 3G system and provides a comprehensive evolution of the UniveRSal Mobile Telecommunications System specifications so as to remain competitive with other broadband systems such as 802.16e (WiMAX)
标签： Essentials LTE-A LTE and of
上传时间： 2020-05-27
上传用户：shancjb
Cellular communications is one of the fastest growing and most challenging telecom- munication applications ever. Today, it represents a large and continuously increasing percentage of all new telephone subscribers around the world. In the long term, cellular digital technology may become the UniveRSal way of communication.
标签： Engineering System GSM
上传时间： 2020-05-27
上传用户：shancjb
Recent decades have shown a tremendous expansion of the Internet. The number of connected terminals has increased by orders of magnitude, traffic has grown exponen- tially, coverage has become ubiquitous and worldwide, and today’s sophisticated Web 2.0 applications are increasingly providing services which hitherto have been the realm of telecommunications, such as Skype and video conferencing. This has even led to the thought that access to the Internet might one day be a UniveRSal right of every citizen. This evolution will accelerate in the coming decades.
标签： Networking Personal Networks Wireless
上传时间： 2020-05-31
上传用户：shancjb
This book is concerned with integrated circuits and systems for wireless and mobile communications. Circuit techniques and implementation of reconfigurable low-voltage and low-power single-chip CMOS transceivers for multiband and multi- mode UniveRSal wireless communications are the focus of the book. Applications encompass both long-range mobile cellular communications (GSM and UMTS) and short-range wireless LANs (IEEE802.11 and Bluetooth). Recent advances in research into transceiver architecture, RF frontend, analogue baseband, RF CAD and automatic testing are reported.
标签： Communication Wireless Circuits Systems and
上传时间： 2020-06-01
上传用户：shancjb
This book paves the path toward fourth generation (4G) mobile communica- tion by introducing mobility in heterogeneous IP networks with both third generation (3G) and wireless local area networks (WLANs), which is seen as one of the central issues in the becoming 4G of telecommunications networks and systems. This book presents a thorough overview of 3G networks and standards and discusses interworking and handover mechanisms between WLANs and the UniveRSal Mobile Telecommunication System (UMTS).
标签： Wireless towards WLANs WPANs 4G
上传时间： 2020-06-01
上传用户：shancjb
This is a practical book, to be sure, but it is also a book about hope and posi- tive change. I am quite sincere. The delivery of electricity is deeply rooted in the principle of UniveRSal access; when clean, reliable energy is available it contributes to poverty alleviation, improved social conditions, and enhanced economic development. In the developed world, we know this to be true. The digital fabric of our lives is a testimony to the importance of energy security. Across the globe, we have seen the vital contributions that electrification has brought to the development of economies and an enhanced quality of life. Nonetheless, this supreme engineering achievement has languished, and we are deeply challenged.
标签： Strategies Analytics Data Big
上传时间： 2020-06-07
上传用户：shancjb
The next avatar of the Internet will revolutionize our world. In time, it will provide us a UniveRSal remote control, enabling us to monitor and control physical objects located anywhere on the planet, using a smart phone. It will make the universe around us programmable, allowing us to script the behav- ior of physical objects with electronic commands. This book is about such an emerging new version of the Internet.
标签： Infrastructure Construction Design RFID and an of
上传时间： 2020-06-08
上传用户：shancjb
Build a UniveRSal Coil Winding Machine by David J. Gingery (z-lib.org).pdf
标签： 绕线机
上传时间： 2022-01-15
上传用户：wwa875
面向 5G 的新型多载波传输技术比较 摘 要: 介绍了几种面向 5G 的新型多载波传输技术: 滤波器组多载波( FBMC，Filter Bank Multicarri- er) 、通用滤波多载波( UFMC，UniveRSal Filtered Multicarrier) 和广义频分复用( GFDM，Generalized Fre- quency Division Multiplexing) 的基本原理，并从第五代移动通信系统( 5G) 支持的应用场景和技术需求的 角度对三种多载波传输技术的优缺点进行比较。研究表明三种多载波传输技术的带外泄露较低，FBMC 系统 不使用 CP( CP，Cyclic Prefix) ，因此具有很高的时频效率，但 FBMC 系统帧的长度比较长，不适合短 包类业务; UFMC 对一组连续的子载波滤波，可以支持较短的帧结构，但 UFMC 不使用 CP，复杂度较高; GFDM 基于独立的块调制，具有灵活的帧结构，鲁棒性好，复杂度比前两者 低，便于实际应用。 关键词: 多载波; 第五代移动通信系统; 滤波器组多载波; 通用滤波多载波; 广义频分复用
标签： 5G
上传时间： 2022-02-25
上传用户：kingwide
