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The rapid Growth in mobile communications has led to an increasing demand for wide-
band high data rate communications services. In recent years, Distributed Antenna
Systems (DAS) has emerged as a promising candidate for future (beyond 3G or 4G)
mobile communications, as illustrated by projects such as FRAMES and FuTURE. The
architecture of DAS inherits and develops the concepts of pico- or micro-cell systems,
where multiple distributed antennas or access points (AP) are connected to and con-
trolled by a central unit.
標簽：
Distributed
Antenna
Systems
上傳時間：
2020-05-27
上傳用戶：shancjb
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During the past two decades there has been a substantial Growth in research in
wireless communications. The number of journals published from various parts of
the world catering to the research community has grown exponentially. Despite
such a Growth, the engineering community still needs more information so as to
thoroughly comprehend wireless channel characteristics. What specifically must be
understood are the effects of channel degradation brought on by statistical fluctua-
tions in the channel.
標簽：
Shadowing
Wireless
Systems
Fading
and
in
上傳時間：
2020-05-27
上傳用戶：shancjb
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Currently, the information and communications technology (ICT) industry sector
accounts for about 2–6% of the energy consumption worldwide, and a significant por-
tion of this is contributed by the wireless and mobile communications industry. With
the proliferation of wireless data applications, wireless technology continues to increase
worldwide at an unprecedented Growth rate. This has resulted in an increased number
of installed base stations and higher demand on power grids and device power usage,
causing an increased carbon footprint worldwide.
標簽：
Communication
Networks
Green
Radio
上傳時間：
2020-05-27
上傳用戶：shancjb
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The wireless market has experienced a phenomenal Growth since the first second-
generation (2G) digital cellular networks, based on global system for mobile
communications (GSM) technology, were introduced in the early 1990s. Since then,
GSM has become the dominant global 2G radio access standard. Almost 80% of today’s
new subscriptions take place in one of the more than 460 cellular networks that use
GSM technology. This Growth has taken place simultaneously with the large experienced
expansion of access to the Internet and its related multimedia services.
標簽：
Performance
Evolution
GPRS
EDGE
GSM
and
上傳時間：
2020-05-27
上傳用戶：shancjb
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With the rapid Growth in the number of wireless applications, services and devices,
using a single wireless technology such as a second generation (2G) and third gener-
ation (3G) wireless system would not be efficient to deliver high speed data rate and
quality-of-service (QoS) support to mobile users in a seamless way. The next genera-
tion wireless systems (also sometimes referred to as Fourth generation (4G) systems)
are being devised with the vision of heterogeneity in which a mobile user/device will
be able to connect to multiple wireless networks (e.g., WLAN, cellular, WMAN)
simultaneously.
標簽：
Heterogeneous
Wireless
Networks
Access
上傳時間：
2020-05-27
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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The last decade proved to be hugely successful for the mobile communications industry,
characterised by continued and rapid Growth in demand, spurred on by new technological
advances and innovative marketing techniques. Of course, when we refer to mobile commu-
nications, we tend to implicitly refer to cellular systems, such as GSM. The plight of the
mobile-satellite industry over the last decade, although eventful, has, at times, been more akin
to an out of control roller coaster ride.
標簽：
Communication
Satellite
Networks
Mobile
上傳時間：
2020-05-30
上傳用戶：shancjb
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The Growth of mobile technologies is remarkable. At a recent Mobile World Congress Conference, Eric
Schmidt, CEO of Google predicted that within three years, smart phones will surpass Personal Com-
puter sales. The number of mobile phones used worldwide has exceeded 4.6 billion with continued
Growth expected in the future. In fact, in the United States alone, the numbers of mobile phone users
comprise over 80% of the population.
標簽：
Opportunities
Consumption
Technology
Mobile
上傳時間：
2020-05-30
上傳用戶：shancjb
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The insinuation of telecommunications into the daily fabric of our lives has been
arguably the most important and surprising development of the last 25 years. Before
this revolution, telephone service and its place in our lives had been largely stable
for more than a generation. The Growth was, so to speak, lateral, as the global reach
of telecommunications extended and more people got telephone service. The
distinction between oversea and domestic calls blurred with the advances in
switching and transmission, undersea cable, and communication satellites. Traffic
on the network remained overwhelmingly voice, largely in analog format with
facsimile (Fax) beginning to make inroads.
標簽：
Telecommunications
Modeling
Analysis
and
of
上傳時間：
2020-05-31
上傳用戶：shancjb
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Wireless communication is witnessing tremendous Growth with great proliferation of different standards covering wide ,local and personal area networks
標簽：
Multi-Standard
Receivers
Wireless
CMOS
上傳時間：
2020-05-31
上傳用戶：shancjb
