15,862 research outputs found
Modeling of Packet Streaming Services in Information Communication Networks
Application of the term video streaming in contemporary usage denotes compression techniques and
data buffering, which can transmit video in real time over the network. There is currently a rapid growth
and development of technologies using wireless broadband technology as a transport, which is a seri-
ous alternative to cellular communication systems. Adverse effect of the aggressive environment used
in wireless networks transmission results in data packets undergoing serious distortions and often get-
ting lost in transit. All existing research in this area investigate the known types of errors separately. At
present there are no standard approaches to determining the effect of errors on transmission quality of
services. Besides, the spate in popularity of multimedia applications has led to the need for optimization
of bandwidth allocation and usage in telecommunication networks. Modern telecommunication networks
should by their definition be able to maintain the quality of different applications with different Quality
of Service (QoS) levels. QoS requirements are generally dependent on the parameters of network and
application layers of the OSI model. At the application layer QoS depends on factors such as resolution,
bit rate, frame rate, video type, audio codecs, and so on. At the network layer, distortions (such as delay,
jitter, packet loss, etc.) are introduced
Modeling, Simulation and Analysis of Video Streaming Errors in Wireless Wideband Access Networks
Analysis of simulated models has become a veritable tool for
investigating network behavioral patterns vis-à-vis transmitted content. The
streaming video research domain employs modeling extensively due to availability
of relevant tools. A vast majority of which are presented on the FOSS platform.
The transmission of audio and video streaming services over different media is
becoming ever more popular. This widespread increase is accompanied by the
difficult task of maintaining the QoS of streaming video. The use of very accurate
coding techniques for transmissions over wireless networks alone cannot guarantee
a complete eradication of distortions characteristic of the video signal. A software-
hardware composite system has been developed for investigating the effect of
single bit error and bit packet errors in wideband wireless access systems on the
quality of H.264/AVC standard video streams. Numerical results of the modeling
and analysis of the effect of interference robustness on quality of video streaming
are presented and discussed. Analytic results also suggest that the Markov model
of packetization of error obtained from a real network for streaming video can be
used in the simulations of transmission of video across networks in the hardware-
software complex developed by the authors in a previous work
TPC tracking and particle identification in high-density environment
Track finding and fitting algorithm in the ALICE Time projection chamber
(TPC) based on Kalman-filtering is presented. Implementation of particle
identification (PID) using d/d measurement is discussed. Filtering and
PID algorithm is able to cope with non-Gaussian noise as well as with ambiguous
measurements in a high-density environment. The occupancy can reach up to 40%
and due to the overlaps, often the points along the track are lost and others
are significantly displaced. In the present algorithm, first, clusters are
found and the space points are reconstructed. The shape of a cluster provides
information about overlap factor. Fast spline unfolding algorithm is applied
for points with distorted shapes. Then, the expected space point error is
estimated using information about the cluster shape and track parameters.
Furthermore, available information about local track overlap is used. Tests are
performed on simulation data sets to validate the analysis and to gain
practical experience with the algorithm.Comment: 9 pages, 5 figure
Power Line Communication Technologies: Modeling and Simulation of PRIME Physical Layer
Power Line Communications is a relatively new
area of telecommunication. PLC employs full duplex methods
for transmitting data over power lines as medium of
transmission of electrical signals over a grid. PLC technologies
are used in advanced meter reading, home automation and
Public street lighting. Several PLC technologies classified
based on the operational frequency range, are explored in this
paper. PRIME is a new NBPLC system, which uses OFDM in
its physical layer, for power line communication in the last
mile. This work also focused on PRIME’s physical
specifications, which was modeled in MATLAB/SIMULINK.
In this paper, the performance of PRIME when its data is
modulated using DQPSK and 4-QAM in four (4) channel
models is shown.
Quark model description of the tetraquark state X(3872) in a relativistic constituent quark model with infrared confinement
We explore the consequences of treating the X(3872) meson as a tetraquark
bound state. As dynamical framework we employ a relativistic constituent quark
model which includes infrared confinement in an effective way. We calculate the
decay widths of the observed channels X-> Jpsi+2\pi (3\pi) and X-> \bar
D0+D0+\pi0 via the intermediate off--shell states X-> Jpsi+\rho(\omega) and X->
\bar D + D*. For reasonable values of the size parameter of the X(3872) we find
consistency with the available experimental data. We also discuss the possible
impact of the X(3872) in a s-channel dominance description of the
Jpsi-dissociation cross section.Comment: 9 pages, 5 figures; discussion and references added, accepted in
Phys. Rev.
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