-
Mobile radio networks have risen in prominence over the last few years, primarily by the rise
in popularity of Cellular phones. It is important to recognise however that mobile radio
technology fulfils a far wider range of applications that meet the demands of the modern
world. These include the networks that allow police and emergency services to serve the
public, military networks for operations and humanitarian support, and the mobile technol-
ogies that are vital to the safety of aircraft.
標(biāo)簽：
Network
Mobile
Design
Radio
上傳時(shí)間：
2020-05-30
上傳用戶(hù)：shancjb
-
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(biāo)簽：
Wireless
Systems
Mobile
Beyond
and
3G
上傳時(shí)間：
2020-05-30
上傳用戶(hù)：shancjb
-
At the macroscopic level of system layout, the most important issue is path loss. In the
older mobile radio systems that are limited by receiver noise, path loss determines SNR and
the maximum coverage area. In Cellular systems, where the limiting factor is cochannel
interference, path loss determines the degree to which transmitters in different cells interfere
with each other, and therefore the minimum separation before channels can be reused.
標(biāo)簽：
Characteristics
Channel
Mobile
上傳時(shí)間：
2020-05-30
上傳用戶(hù)：shancjb
-
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(biāo)簽：
Communication
Satellite
Networks
Mobile
上傳時(shí)間：
2020-05-30
上傳用戶(hù)：shancjb
-
Coverage of routing techniques in various wired and wireless networks is the unique
proposition of this book. Routing protocols and algorithms are the brains of any network.
The selection of topics in this book is clear: we attempt to explain routing in its entirety,
starting from fundamental concepts, then moving through routing on the Internet, and
finally cutting across the recent‐day Cellular, ad hoc, and wireless networks.
標(biāo)簽：
Fundamentals
Applications
Network
Routing
上傳時(shí)間：
2020-05-31
上傳用戶(hù)：shancjb
-
The telecommunications industry has seen a rapid boost within the last decade. New realities
and visions of functionalities in various telecommunications networks have brought forward the
concept of next-generation networks (NGNs). The competitions among operators for support-
ing various services, lowering of the cost of having mobile and Cellular phones and smartphones,
increasing demand for general mobility, explosion of digital traffic, and advent of convergence
network technologies added more dynamism in the idea of NGNs. In fact, facilitating con-
vergence of networks and convergence of various types of services is a significant objective of
NGNs.
標(biāo)簽：
Next-Generation
Converged
Networks
上傳時(shí)間：
2020-05-31
上傳用戶(hù)：shancjb
-
The goal of this book is to provide a concise but lucid explanation and deriva-
tion of the fundamentals of spread-spectrum communication systems. Although
spread-spectrum communication is a staple topic in textbooks on digital com-
munication, its treatment is usually cursory, and the subject warrants a more
intensive exposition. Originally adopted in military networks as a means of
ensuring secure communication when confronted with the threats of jamming
and interception, spread-spectrum systems are now the core of commercial ap-
plications such as mobile Cellular and satellite communication.
標(biāo)簽：
Principles
Spectrum
Spread
of
上傳時(shí)間：
2020-05-31
上傳用戶(hù)：shancjb
-
In a Cellular communication system, a service area or a geographical
region is divided into a number of cells, and each cell is served by an
infrastructure element called the base station through a radio interface.
Management of radio interface related resources is a critical design
component in Cellular communications.
標(biāo)簽：
Management
Resource
Radio
上傳時(shí)間：
2020-06-01
上傳用戶(hù)：shancjb
-
Radio frequency spectrum is a scarce and critical natural resource that is utilized for
many services including surveillance, navigation, communication, and broadcast-
ing. Recent years have seen tremendous growth in the use of spectrum especially by
commercial Cellular operators. Ubiquitous use of smartphones and tablets is one
of the reasons behind an all-time high utilization of spectrum. As a result, Cellular
operators are experiencing a shortage of radio spectrum to meet bandwidth
demands of users. On the other hand, spectrum measurements have shown that
much spectrum not held by Cellular operators is underutilized even in dense urban
areas. This has motivated shared access to spectrum by secondary systems with no
or minimal impact on incumbent systems. Spectrum sharing is a promising
approach to solve the problem of spectrum congestion as it allows Cellular operators
access to more spectrum in order to satisfy the ever-growing bandwidth demands of
commercial users.
標(biāo)簽：
Spectrum
Sharing
Between
Radars
上傳時(shí)間：
2020-06-01
上傳用戶(hù)：shancjb
-
The goal of this book is to provide a concise but lucid explanation and deriva-
tion of the fundamentals of spread-spectrum communication systems. Although
spread-spectrum communication is a staple topic in textbooks on digital com-
munication, its treatment is usually cursory, and the subject warrants a more
intensive exposition. Originally adopted in military networks as a means of
ensuring secure communication when confronted with the threats of jamming
and interception, spread-spectrum systems are now the core of commercial ap-
plications such as mobile Cellular and satellite communication.
標(biāo)簽：
Spread-Spectrum
Communication
Systems
1st
上傳時(shí)間：
2020-06-01
上傳用戶(hù)：shancjb
