-
The first Third Generation Partnership Project (3GPP) Wideband Code Division
Multiple Access (WCDMA) networks were launched during 2002. By the end of 2005
there were 100 open WCDMA networks and a total of over 150 operators having
frequency licenses for WCDMA operation. Currently, the WCDMA networks are
deployedinUniversalMobileTelecommunicationsSystem(UMTS)bandaround2GHz
in Europe and Asia including Japan and Korea. WCDMA in America is deployed in the
existing 850 and 1900 spectrum allocations while the new 3G band at 1700/2100 is
expected to be available in the near future. 3GPP has defined the WCDMA operation
also for several additional bands, which are expected to be taken into use during the
coming years.
標簽：
HSDPAHSUPA
Access
Speed
Radio
UMTS
High
for
上傳時間：
2020-05-27
上傳用戶：shancjb
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There are few technologies that have had a more profound effect on people’s lives
than mobile communications. As recently as twenty years ago no one had a mobile
phone, while today 1.4 billion men, women and children depend on them. This now
exceeds the number of landline users, where it took the preceding one hundred years
to reach the 1 billion mark. The ability to make mobile voice calls turns out to be the
answer to a deeply felt need across different cultures who simply want to
communicate.
標簽：
Communications
Wireless
Mobile
and
上傳時間：
2020-05-30
上傳用戶：shancjb
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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.
標簽：
Channels
Mobile
Radio
上傳時間：
2020-05-30
上傳用戶：shancjb
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With the rapid growth of the wireless mobile applications, wireless voice has
begun to challenge wireline voice, whereas the desire to access e-mail, surf the
Web or download music (e.g., MP3) wirelessly is increasing for wireless data.
while second generation (2G) cellular wireless systems, such as cdmaOne1,
GSM2 and TDMA3, introduced digital technology to wireless cellular systems
to deal with the increasing demand for wireless applications, there is still the
need for more spectrally efficient technologies for two reasons. First, wireless
voice capacity is expected to continue to grow. Second, the introduction of
high-speed wireless data will require more bandwidth.
標簽：
Wireless
Systems
Mobile
Beyond
and
3G
上傳時間：
2020-05-30
上傳用戶：shancjb
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Rapid growth of wireless communication services in recent decades has created
a huge demand of radio spectrum. Spectrum scarcity and utilization inefficiency
limit the development of wireless networks. Cognitive radio is a promising tech-
nology that allows secondary users to reuse the underutilized licensed spectrum of
primary users. The major challenge for spectrum sharing is to achieve high spectrum
efficiency while making non-intrusive access to the licensed bands. This requires in-
formation of availability and quality of channel resources at secondary transmitters,
however, is difficult to be obtained perfectly in practice.
標簽：
Opportunistic
Spectrum
Sharing
上傳時間：
2020-05-31
上傳用戶：shancjb
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This book stems from its ancestor Digital Transmission Theory,published by
Prentice-Hall in 1987 and now out of print. Following the suggestion of several colleagues who complained about the unavailability of a textbook they liked and adopted in their courses, laying a strong emphasis on wireless communication. We hope that those who liked the previous book will find again its flavor here,while new reader, untouched by nostalgia, will judge it favorably.
標簽：
Transmission
Principles
Digital
of
上傳時間：
2020-05-31
上傳用戶：shancjb
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Radio propagation measurements and channel modelling continue to be of fundamental importance
to radio system design. As new technology enables dynamic spectrum access and higher data rates,
radio propagation effects such as shadowing, the presence of multipath and frequency dispersion
are the limiting factors in the design of wireless communication systems. while there are several
books covering the topic of radio propagation in various frequency bands, there appears to be no
books on radio propagation measurements, which this book addresses at length.
標簽：
Propagation
Measurement
Radio
上傳時間：
2020-06-01
上傳用戶：shancjb
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Digital mobile wireless communication and the Internet have undergone a
fantastic growth in the last few years and, despite originating from two different
worlds, they are converging. This convergence corresponds to the evolution of
mobile systems towards the highest broadband data transmissions (GSM,
EDGE/GPRS, UMTS then HSDPA), while the computing world gets equipped with
wireless technologies such as Wi-Fi or Wi-Max.
標簽：
Reconfigurable
Systems
Mobile
Radio
上傳時間：
2020-06-01
上傳用戶：shancjb
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The following sections profile many of the vendors in the NFV market. The individual profiles were created
through a collaborative effort between SDNCentral’s Research Team and the Vendor’s product experts.
SDNCentral worked under the assumption the information provided by the vendors was factual, auditing the
submissions only to remove unverifiable claims and hyperbole. Extended profiles can be viewed online.
while every attempt has been made to validate the capabilities listed in the profiles, SDNCentral advises end
users to verify the veracity of each claim for themselves in their actual deployment environments. SDNCentral
cannot be held liable for unexpected operations, damages or incorrect operation due to any inaccuracies listed
here. SDNCentral welcomes feedback and additional information from end users based on their real-world
experiences with the products and technologies listed. The SDNCentral research team can be reached at
標簽：
SDxCentral-Mega-NFV-Report
上傳時間：
2020-06-01
上傳用戶：shancjb
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Convergence between the two largest networks (Telecom and IP) is taking place
very rapidly and at diff erent levels: (1) network level: unifi cation of IP networks
with traditional Telecom networks through evolving standards (Session Initiation
Protocol (SIP), Realtime Transfer Protocol (RTP), SS7, 3G) to support interopera-
bility; (2) service level: traditional Telecom services like voice calls are being provi-
sioned on the IP backbone (VoIP), while traditional IP services (most data-driven
services such as multimedia, browsing, chatting, gaming, etc.) are accessible over
the Telecom network.
標簽：
Platforms
Delivery
Service
上傳時間：
2020-06-01
上傳用戶：shancjb
