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The field of digital communication has evolved rapidly in the past few
decades, with commercial applications proliferating in wireline communi-
cation networks (e.g., digital subscriber loop, cable, fiber optics), wireless
communication (e.g., cell phones and wireless local area networks), and stor-
age media (e.g., compact discs, hard drives). The typical undergraduate and
graduate student is drawn to the field because of these applications, but is
often intimidated by the mathematical background necessary to understand
communication theory.
標(biāo)簽：
Communication
Fundamentals
Digital
of
上傳時(shí)間：
2020-05-27
上傳用戶：shancjb
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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(biāo)簽：
HSDPAHSUPA
Access
Speed
Radio
UMTS
High
for
上傳時(shí)間：
2020-05-27
上傳用戶：shancjb
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In this paper we revisit hybrid analog-digital precoding systems with emphasis on their modelling
and radio-frequency (RF) losses, to realistically evaluate their benefits in 5G system implementations.
For this, we decompose the analog beamforming networks (ABFN) as a bank of commonly used RF
components and formulate realistic model constraints based on their S-parameters. Specifically, we
concentrate on fully-connected ABFN (FC-ABFN) and Butler networks for implementing the discrete
Fourier transform (DFT) in the RF domain. The results presented in this paper reveal that the performance
and energy efficiency of hybrid precoding systems are severely affected, once practical factors are
considered in the overall design. In this context, we also show that Butler RF networks are capable of
providing better performances than FC-ABFN for systems with a large number of RF chains.
標(biāo)簽：
Analog-Digital
Precoding
Hybrid
上傳時(shí)間：
2020-05-27
上傳用戶：shancjb
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This is believed to be the first book that takes a view of nanotechnology from a
telecommunications and networking perspective. Nanotechnology refers to the manip-
ulation of materials at the atomic or molecular level. Nanotechnology is getting a lot
of attention of late not only in academic settings and in laboratories around the
world, but also in government and venture capitalists’ initiatives. There now is a
major drive to commercialize the technology by all sorts of firms, ranging from start-
ups to Fortune 100 companies.
標(biāo)簽：
Nanotechnology
Applications
上傳時(shí)間：
2020-05-31
上傳用戶：shancjb
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Spread-spectrum communication is a core area within the field of digital
communication. Originally used in military networks as countermeasures against
the threats of jamming and interception, spread-spectrum systems are now widely
used in commercial applications and are part of several wireless and mobile
communication standards. Although spread-spectrum communication is a staple
topic in textbooks on digital communication, its treatment is usually cursory. This
book is designed to provide a more intensive examination of the subject that is
suitable for graduate students and practicing engineers with a solid background
in the theory of digital communication. As the title indicates, this book stresses
principles rather than specific current or planned systems, which are described in
manyotherbooks.My goal in this bookis to providea concisebut lucidexplanation
of the fundamentals of spread-spectrum systems with an emphasis on theoretical
principles.
標(biāo)簽：
Spread-Spectrum
Communication
Systems
2nd
上傳時(shí)間：
2020-06-01
上傳用戶：shancjb
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In the two years since this book was first published, ultra wideband (UWB) has
advanced and consolidated as a technology, and many more people are aware of the
possibilities for this exciting technology. We too have expanded and consolidated
materials in this second edition in the hope that ‘Ultra Wideband: Signals and Systems
in Communication Engineering’ will continue to prove a useful tool for many students
and engineers to come to an understanding of the basic technologies for UWB.
標(biāo)簽：
Wideband
Signals
Systems
Ultra
and
上傳時(shí)間：
2020-06-01
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Micro-Electro-Mechanical Systems (MEMS) are miniature systems composed
ofintegratedelectricalandmechanicalpartstosenseand/orcontrolthingsonaμmscale.
The concept of MEMS is attributed to Richard Feynman’s famous talk on December
29th, 1959 [2,3]. Dr. Feynman foresaw many aspects of future MEMS development
with his insight in microphysics. In particular, material properties in the μm scale are
differentfrombulkpropertiesandthescalingdownofintegratedcircuits(IC)fabrication
technology has been a major driving force of MEMS development.
標(biāo)簽：
Performance
High
MEMS
RF
上傳時(shí)間：
2020-06-06
上傳用戶：shancjb
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Over many years, RF-MEMS have been a hot topic in research at the technology
and device level. In particular, various kinds of mechanical Si-MEMS resonators
and piezoelectric BAW (bulk acoustic wave) resonators have been developed. The
BAW technology has made its way to commercial products for passive RF filters,
in particular for duplexers in RF transceiver front ends for cellular communica-
tions. Beyond their use in filters, micromachined resonators can also be used in
conjunction with active devices in innovative circuits and architectures.
標(biāo)簽：
MEMS-based
Circuits
Systems
and
上傳時(shí)間：
2020-06-06
上傳用戶：shancjb
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Since the 1990s the EU has been pursuing climate change mitigation targets. Following the
international commitment to the legally binding greenhouse gas reduction under the Kyoto
Protocol, the 2020 policy package consists of a set of binding legislation to ensure that the EU
meets its climate and energy targets for the year 2020. The package sets three key targets: 20%
reduction in greenhouse gas emissions (from 1990 levels), 20% of EU energy from renewables (as
well as a 10% target for renewable fuels) and 20% improvement in energy efficiency. The targets
were set by EU leaders in 2007 and enacted in legislation in 2009 3 . They are also headline targets of
the Europe 2020 strategy for smart, sustainable and inclusive growth.
標(biāo)簽：
Preparatory
Ecodesign
Study
上傳時(shí)間：
2020-06-06
上傳用戶：shancjb
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Resource allocation is an important issue in wireless communication networks. In
recent decades, cognitive radio technology and cognitive radio-based networks have
obtained more and more attention and have been well studied to improve spectrum
utilization and to overcomethe problem of spectrum scarcity in future wireless com-
munication systems. Many new challenges on resource allocation appear in cogni-
tive radio-based networks. In this book, we focus on effective solutions to resource
allocation in several important cognitive radio-based networks, including a cogni-
tive radio-basedopportunisticspectrum access network, a cognitiveradio-basedcen-
tralized network, a cognitive radio-based cellular network, a cognitive radio-based
high-speed vehicle network, and a cognitive radio-based smart grid.
標(biāo)簽：
Cognitive
Networks
Radio
上傳時(shí)間：
2020-06-07
上傳用戶：shancjb
