Báo cáo hóa học: " CSMA/CCA: A Modified CSMA/CA Protocol Mitigating the Fairness Problem for IEEE 802 11 DCF" docx
Báo cáo hóa học: " CSMA/CCA: A Modified CSMA/CA Protocol Mitigating the Fairness Problem for IEEE 802.11 DCF" docx
... replacing
AP1 and AP2 with STA3 and STA4 and assuming that all the
stations are in the same BSS but STA3 and STA4 cannot hear
each other, the same problem arises. The MACAW protocol
[4] fails in ... contends for links AP1-STA2
and AP1-STA3 separately. Since all the members of a WLAN
share the same wireless channel, a MAC protocol is needed
to coordinate their access.
A...
báo cáo hóa học: " Optimal modulation and coding scheme allocation of scalable video multicast over IEEE 802.16e networks" docx
... of a video stream and assigning the appro-
priate MCS for each video layer to maximize the total
utility is a crucial task [11- 21]. Formally, the problem
can be stated as follows: consider a video ... efficiency
and maximize utility is a crucial task. We formulate this MCS assignment problem as an optimization problem,
called the total utility maximization problem (...
Báo cáo hóa học: " Research Article Efficient Transmission of H.264 Video over Multirate IEEE 802.11e WLANs" docx
... information is missing and the MB types and
motion vectors are available (from partition A) .
2.2. The 802. 11e WLAN standard
The MAC layer of the 802. 11 standard is based on the
CSMA/CA mechanism ... virtual packets at a rate
equal to the average rate and at intervals equal to the inverse
of frame rate. The virtual packet sizes are calculated using
the bitrate and...
Báo cáo hóa học: " Research Article Modified Polar Sigma-Delta Transmitter for Multiradio Applications" pptx
... 2010, Article ID 979120, 9 pages
doi:10 .115 5/2010/979120
Research Article
Modified Polar Sigma-Delta Transmitter for
Multiradio Applications
Martha Liliana Suarez Penaloza,
1
V
´
aclav Valenta,
1, ... standard and theoretical values for the
maximum oversampling ratios for other communications
standards have been calculated as well.
To approach to more realistic analyses, we didn’t...
Báo cáo hóa học: "Research Article Modified Adaptive Chirplet Decomposition with Application in ISAR Imaging of Maneuvering Targets" pptx
... method approximates the received
signals as a series of linear frequency modulated signals. But,
the accuracy is not high, and there are many false scatters
in the image. So, a new ISAR imaging algorithm ... traditional chirplet decomposition.
Now, we compare the ISAR imaging results of real data and
simulated data based on the two algorithms.
(1) Real data
We choose a segment...
Báo cáo hóa học: " Quinoline Group Modified Carbon Nanotubes for the Detection of Zinc Ions" ppt
... and the carboxyl groups available on
the surface of the support. Fourier transform infrared
spectroscopy (FTIR) and Thermogravimetric analysis
(TGA) unambiguously proved the existence of covalent
bonds ... new peak that appeared around
1686 cm
-1
is attributed to the amide carbonyl (C=O)
stretch. Another new peak at 1629.87 cm
-1
is attributed to
secondary amide band which accompani...
Báo cáo hóa học: " Research Article Modified Spatial Channel Model for MIMO Wireless Systems" ppt
... be-
tween antennas the larger is the MIMO capacity. The spatial
correlation is dictated by the angular spread of the propa-
gation paths at the transmitter and the receiver. Root mean
square (RMS) angular ... an-
gular spread (AS), angle of departure (AoD), angle of ar-
rival (AoA), and power azimuth spectrum (PAS). The ar-
ray topology at the BS is, for example, a typic...
Báo cáo hóa học: " Research Article Modified Isochronous Coordination Function for Enhancement of VoIP Call Capacity over IEEE 802.11 WLAN" pptx
... beacon frame, contention-free
Sanjaya Gupta et al. 5
Table 2
IEEE 802. 11b parameters Values
Data rates for data packets 11 Mbps
Data rates for control packets and PHY overheads 1 Mbps
MAC layer ... receiver. After retrieving the VoIP payload,
the DEMUX then restores the original RTP header and nec-
essary destination information and assembles the data into
its original form...
báo cáo hóa học:" Extending basic principles of measurement models to the design and validation of Patient Reported Outcomes" docx
... diagrammatically
A 'Health Status' visual analog scale used in the Health Assessment QuestionnaireFigure 4
A 'Health Status' visual analog scale used in the Health Assessment ... design, the appropriate application of statistical
validation methods, and the suitability of the resulting measure for a particular use in clinical and
population-based outcomes...
Báo cáo hóa học: " Research Article Performance Evaluation of Uplink Delay-Tolerant Packet Service in IEEE 802.16-Based Networks" potx
... every frame and thus it can take them into
account calculating the actual available capacity for the nrtPS
packets H
i
. We note that the actual uplink transmission
requirements represented by the ... demonstrates the dependency of
the mean overall nrtPS delay on the normalized arrival rate
for different total UGS capacity values per frame. Here, the
minimum and the maxim...