-
The new digital radio system DAB (Digital Audio Broadcasting, nowadays often called
Digital Radio) is a very innovative and universal multimedia broadcast system which will
replace the existing AM and FM audio broadcast services in many parts of the world in
the Future. It was developed in the 1990s by the Eureka 147/DAB project. DAB is very
well suited for mobile reception and provides very high robustness against multipath
reception. It allows use of single frequency networks (SFNs) for high frequency
efficiency.
標(biāo)簽：
Broadcasting
Principles
Digital
Audio
上傳時間：
2020-05-27
上傳用戶：shancjb
-
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(biāo)簽：
Distributed
Antenna
Systems
上傳時間：
2020-05-27
上傳用戶：shancjb
-
Following chapter introduces the mobile communication, gives a short history of wireless
communication evolution, and highlights some application scenarios predestined for the
use of mobile devices. Cellular and wireless based systems related to different generations
of mobile communication, including GSM, IS-95, PHS, AMPS, D-AMPS, cdma2000 and
WCDMA are also described by this Chapter. Much attention in this chapter is given
to express the wireless based networks, such as Wi-Fi and WiBro/WiMax, and wireless
broadcasting systems, including DMB, DVB-H, and ISDB-T. We conclude the chapter
with the Future vision of mobile communication evolution
標(biāo)簽：
Technologies
Enhanced
Access
Radio
上傳時間：
2020-05-27
上傳用戶：shancjb
-
The recent developments in full duplex (FD) commu-
nication promise doubling the capacity of cellular networks using
self interference cancellation (SIC) techniques. FD small cells
with device-to-device (D2D) communication links could achieve
the expected capacity of the Future cellular networks (5G). In
this work, we consider joint scheduling and dynamic power
algorithm (DPA) for a single cell FD small cell network with
D2D links (D2DLs). We formulate the optimal user selection and
power control as a non-linear programming (NLP) optimization
problem to get the optimal user scheduling and transmission
power in a given TTI. Our numerical results show that using
DPA gives better overall throughput performance than full power
transmission algorithm (FPA). Also, simultaneous transmissions
(combination of uplink (UL), downlink (DL), and D2D occur
80% of the time thereby increasing the spectral efficiency and
network capacity
標(biāo)簽：
Full-Duplex
Cells
Small
上傳時間：
2020-05-27
上傳用戶：shancjb
-
Providing QoS while optimizing the LTE network in a cost efficient manner is
very challenging. Thus, radio scheduling is one of the most important functions
in mobile broadband networks. The design of a mobile network radio scheduler
holds several objectives that need to be satisfied, for example: the scheduler needs
to maximize the radio performance by efficiently distributing the limited radio re-
sources, since the operator’s revenue depends on it.
標(biāo)簽：
Communications
Future
Mobile
LTE
上傳時間：
2020-05-27
上傳用戶：shancjb
-
This book describes how global mobile communication was made. It is written for those who
want or need to know how this was achieved e.g.:
? Young professionals who want to build their career on GSM and UMTS and need to
understand the basics
? Strategic and technical planners who want to drive the Future GSM and UMTS develop-
ment
? Strategists who plan to repeat GSM’s success in the fourth generation
? Academics, who want to understand and analyse the development of GSM and UMTS;
? Activists in other large scale international communication projects who want to use
experiences gained
標(biāo)簽：
Creation
UMTS
GSM
and
The
of
上傳時間：
2020-05-27
上傳用戶：shancjb
-
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
上傳時間：
2020-05-27
上傳用戶：shancjb
-
To meet the Future demand for huge traffic volume of wireless data service, the research on the fifth generation
(5G) mobile communication systems has been undertaken in recent years. It is expected that the spectral and energy
efficiencies in 5G mobile communication systems should be ten-fold higher than the ones in the fourth generation
(4G) mobile communication systems. Therefore, it is important to further exploit the potential of spatial multiplexing
of multiple antennas. In the last twenty years, multiple-input multiple-output (MIMO) antenna techniques have been
considered as the key techniques to increase the capacity of wireless communication systems. When a large-scale
antenna array (which is also called massive MIMO) is equipped in a base-station, or a large number of distributed
antennas (which is also called large-scale distributed MIMO) are deployed, the spectral and energy efficiencies can
be further improved by using spatial domain multiple access. This paper provides an overview of massive MIMO
and large-scale distributed MIMO systems, including spectral efficiency analysis, channel state information (CSI)
acquisition, wireless transmission technology, and resource allocation.
標(biāo)簽：
Large-scale
Antenna
Systems
上傳時間：
2020-05-27
上傳用戶：shancjb
-
Mobilenetworkoperatorswillmeetmanychallengesinthecomingyears.Itisexpectedthatthe
numberofpeopleconnected,wirelineandwireless,willreachfivebillionby2015.Atthesame
time, people use more wireless services and they expect similar user experience to what they
can now get from fixed networks. Because of that we will see a hundred-fold increase in
network traffic in the near Future. At the same time markets are saturating and the revenue per
bit is dropping.
標(biāo)簽：
Self-Organising
Networks
LTE
上傳時間：
2020-05-27
上傳用戶：shancjb
-
Due to the asymmetry between the amount of data traffic in the downlink and
uplink direction of nowadays and Future wireless networks, a proper design of the
transceivers in the broadcast channel is inevitable in order to satisfy the users’
demands on data rate and transmission quality. This book deals with the optimi-
zation-based joint design of the transmit and receive filters in a MIMO broadcast
channel in which the user terminals may be equipped with several antenna ele-
ments.
標(biāo)簽：
Broadcast
Channel
MIMO
上傳時間：
2020-05-28
上傳用戶：shancjb
