-
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
標簽：
Full-Duplex
Cells
Small
上傳時間：
2020-05-27
上傳用戶：shancjb
-
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.
標簽：
Analog-Digital
Precoding
Hybrid
上傳時間：
2020-05-27
上傳用戶：shancjb
-
Microwave radio network design is a subset of activities that constitute
the Overall transmission network design. Transmission networks are
sometimes called transport networks, access networks, or connectivity
networks. For many wireless carriers, microwave is becoming a popu-
lar preference over wireline (leased lines) transport for many reasons,
especially as microwave radio equipment costs decrease and installation
becomes simpler. Low monthly operating costs can undercut those of
typical single (and especially multiple) T1/E1 expenses, proving it to be
more economical over the long term—usually two to four years. Network
operators also like the fact that they can own and control microwave
radio networks instead of relying on other service providers for network
components.
標簽：
Transmission
Microwave
Networks
上傳時間：
2020-05-28
上傳用戶：shancjb
-
This book presents millimeter wave communication system design and analysis at the
level to produce an understanding of the interaction between a wireless system and its
front end so that the Overall performance can be predicted. Gigabit wireless commu-
nications require a considerable amount of bandwidth, which can be supported by
millimeter waves. Millimeter wave technology has come of age, and at the time of
writing the standards of IEEE 802.15.3c, WiGig, Wireless HD TM , and the European
Computer Manufacturers Association have recently been finalized.
標簽：
Communication
Millimeter
Systems
Wave
上傳時間：
2020-05-28
上傳用戶：shancjb
-
Use of multiple antennas at both ends of wireless links is the result of the
natural progression of more than four decades of evolution of adaptive
antenna technology. Recent advances have demonstrated that multiple-
input-multiple-output (MIMO) wireless systems can achieve impressive
increases in Overall system performance.
標簽：
Technology
System
MIMO
上傳時間：
2020-05-28
上傳用戶：shancjb
-
Never have telecommunications operations and network management been so
important. Never has it been more important to move away from practices that date
back to the very beginning of the telecommunications industry. Building and con-
necting systems internally at low cost, on an as - needed basis, and adding software
for supporting new networks and services without an Overall architectural design
will not be cost effective for the future. Defi ning operations and network manage-
ment requirements at the 11th hour for new technologies, networks, and services
deployments must also change.
標簽：
Telecommunications
Generation
Networks
Next
上傳時間：
2020-05-31
上傳用戶：shancjb
-
Modeling and simulation of nonlinear systems provide communication system designers
with a tool to predict and verify Overall system performance under nonlinearity and
complex communication signals. Traditionally, RF system designers use deterministic
signals (discrete tones), which can be implemented in circuit simulators, to predict the
performance of their nonlinear circuits/systems. However, RF system designers are usually
faced with the problem of predicting system performance when the input to the system
is real-world communication signals which have a random nature.
標簽：
Nonlinear_Distortion_in_Wireless_
Systems
上傳時間：
2020-05-31
上傳用戶：shancjb
-
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.
標簽：
Communications
Physical
Security
Wireless
Layer
in
上傳時間：
2020-05-31
上傳用戶：shancjb
-
HIS IS THE THIRD —and most likely the last—book
in the series on information technology for
energy managers and web based energy infor-
mation and control systems. This book concentrates on
web based enterprise energy and building automation
systems, and serves as a capstone volume in this series.
The thrust here is that the highest level functions of a
building and facility automation system are provided
by a web based EIS/ECS system that provides energy
management, maintenance management, Overall facility
operational management, and ties in with the enterprise
resource management system for the entire facility or
the group of facilities being managed. If there were ever
to be a fourth volume in this series, it would follow
the logical progression of the first three volumes, and
would probably be titled Web Based Enterprise Resource
Management Systems.
標簽：
Enterprise
Energy
Based
Web
上傳時間：
2020-06-06
上傳用戶：shancjb
-
GaN is an already well implanted semiconductor
technology, widely diffused in the LED optoelectronics
industry. For about 10 years, GaN devices have also been
developed for RF wireless applications where they can
replace Silicon transistors in some selected systems. That
incursion in the RF field has open the door to the power
switching capability in the lower frequency range and
thus to the power electronic applications.
Compared to Silicon, GaN exhibits largely better figures
for most of the key specifications: Electric field, energy
gap, electron mobility and melting point. Intrinsically,
GaN could offer better performance than Silicon in
terms of: breakdown voltage, switching frequency and
Overall systems efficiency.
標簽：
GaN-on-Si
Displace
and
SiC
Si
上傳時間：
2020-06-07
上傳用戶：shancjb
