-
The ever-Increasing demand for private and sensitive data transmission over wireless net-
works has made security a crucial concern in the current and future large-scale, dynamic,
and heterogeneous wireless communication systems. To address this challenge, computer
scientists and engineers have tried hard to continuously come up with improved crypto-
graphic algorithms. But typically we do not need to wait too long to find an efficient way
to crack these algorithms. With the rapid progress of computational devices, the current
cryptographic methods are already becoming more unreliable. In recent years, wireless re-
searchers have sought a new security paradigm termed physical layer security. Unlike the
traditional cryptographic approach which ignores the effect of the wireless medium, physi-
cal layer security exploits the important characteristics of wireless channel, such as fading,
interference, and noise, for improving the communication security against eavesdropping
attacks. This new security paradigm is expected to complement and significantly increase
the overall communication security of future wireless networks.
標(biāo)簽：
Communications
Physical
Security
Wireless
Layer
in
上傳時(shí)間：
2020-05-31
上傳用戶：shancjb
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We are currently witnessing an increase in telecommunications norms and
standards given the recent advances in this domain. The Increasing number of
normalized standards paves the way for an increase in the range of offers and
services available for each consumer. Moreover, the majority of available radio
frequencies have already been allocated.
標(biāo)簽：
Allocation
Resource
Radio
上傳時(shí)間：
2020-06-01
上傳用戶：shancjb
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Wireless communications and networking technology are advancing at a very rapid
pace. Newer technologies and standards are evolving to serve the ever-Increasing num-
ber of users demanding different types of mobile applications and services. Research
and development activities on wireless technology constitute one of the most impor-
tant segments of research and development in the telecommunications area today.
標(biāo)簽：
Management
Resource
Radio
上傳時(shí)間：
2020-06-01
上傳用戶：shancjb
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Commoditization is a serious threat to the telecommunications industry. Most CSPs offer
similar services at rates designed to win what has become a price war. As a result, many
face decreasing margins and difficulty sustaining differentiation based on prices or
products alone. On top of commoditization, CSPs also face competition from OTT
providers and an Increasingly knowledgeable and demanding customer base. With
access to growing amounts of data from an ever-Increasing number of sources and
devices, today’s empowered, savvy consumers know what they want and expect to get it.
標(biāo)簽：
RestoringConnections_IBM_CPL
上傳時(shí)間：
2020-06-01
上傳用戶：shancjb
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This book was born from the perception that there is much more to spectrum use
and sharing than one sees reflected in publications, whether academic, commercial
or political. the former – in good research style – tend towards reductionism and
concentrate on specific, detailed aspects. commercial publications tend to empha-
size the positive aspects and they tend to put promise above practice. Given the ever
Increasing pace of technology development and recent successes of new wireless
technologies, some pundits predict large-scale spectrum scarcity, potentially lead-
ing to economic catastrophe. Although economic theory has a hard time explaining
recent events that shook the world economy, the notion of spectrum scarcity is intui-
tively acceptable, even if not correct or immediately relevant.
標(biāo)簽：
Spectrum
Sharing
RF
上傳時(shí)間：
2020-06-01
上傳用戶：shancjb
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When 3GPP started standardizing the IMS a few years ago, most analysts expected the
number of IMS deploymentsto grow dramatically as soon the initial IMS specifications were
ready (3GPP Release 5 was functionallyfrozenin the first half of 2002and completedshortly
after that). While those predictions have proven to be too aggressive owing to a number of
upheavals hitting the ICT (Information and Communications Technologies) sector, we are
now seeing more and more commercial IMS-based service offerings in the market. At the
time of writing (May 2008), there are over 30 commercial IMS networks running live traffic,
addingup to over10million IMS users aroundthe world; the IMS is beingdeployedglobally.
In addition, there are plenty of ongoing market activities; it is estimated that over 130 IMS
contracts have been awarded to all IMS manufacturers. The number of IMS users will grow
substantially as these awarded contracts are launched commercially. At the same time, the
number of IMS users in presently deployed networks is steadily Increasing as new services
are introduced and operators running these networks migrate their non-IMS users to their
IMS networks.
標(biāo)簽：
Multimedia
Subsystem
The
IMS
3G
IP
上傳時(shí)間：
2020-06-01
上傳用戶：shancjb
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Once upon a time, cellular wireless networks provided two basic services: voice
telephony and low-rate text messaging. Users in the network were separated
by orthogonal multiple access schemes, and cells by generous frequency reuse
patterns [1]. Since then, the proliferation of wireless services, fierce competition,
andthe emergenceof new service classes such as wireless data and multimediahave
resulted in an ever Increasing pressure on network operators to use resources in a
moreefficient manner.In the contextof wireless networks,two of the most common
resources are power and spectrum—and, due to regulations, these resources are
typically scarce. Hence, in contrast to wired networks, overprovisioning is not
feasible in wireless networks.
標(biāo)簽：
Maximization
Nonconvex
Wireless
Utility
Systems
in
上傳時(shí)間：
2020-06-01
上傳用戶：shancjb
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The advent of modern wireless devices, such as smart phones and MID 1 terminals,
has revolutionized the way people think of personal connectivity. Such devices
encompass multiple applications ranging from voice and video to high-speed data
transfer via wireless networks. The voracious appetite of twenty-first century users
for supporting more wireless applications on a single device is ever Increasing.
These devices employ multiple radios and modems that cover multiple frequency
bands and multiple standards with a manifold of wireless applications often running
simultaneously.
標(biāo)簽：
Architectures
Wireless
Receiver
Design
and
上傳時(shí)間：
2020-06-01
上傳用戶：shancjb
-
Describing the relevant detection and estimation theory, this detailed guide provides
the background knowledge needed to tackle the design of practical WLAN positioning
systems. It sets out key system-level challenges and design considerations in Increasing
positioningaccuracyandreducingcomputationalcomplexity,examinesdesigntradeoffs,
and presents experimental results.
標(biāo)簽：
Positioning
Systems
WLAN
上傳時(shí)間：
2020-06-01
上傳用戶：shancjb
-
Contamination and electrostatic discharge (ESD) are now becoming recognized as factors
affecting yield and reliability in an ever-Increasing number of industries. Whereas contam-
ination traditionally was recognized as affecting the semiconductor, disk drive, aerospace,
pharmaceutical, and medical device industries, today such industries as automobile and
food production are also discovering the benefits of contamination control. ESD control
has experienced a similar growth in applications.
標(biāo)簽：
Contamination
Control
and
ESD
上傳時(shí)間：
2020-06-05
上傳用戶：shancjb
