multiple access techniques for wireless communication rappaport ppt
Multi-Carrier Technologies for Wireless Communication
Ngày tải lên :
02/03/2013, 16:59
... interests
include multiple access techniques, estimation theory, multi-user detection
and channel modeling.
“I am extremely grateful to my parents for the sacrifices they have made and
for imparting ... of wireless telecommunications, a
number of trends are gaining widespread popularity. Among these is the
explosion of interest in multi-carrier communications, and its application to
wireless multiple- access. ... mobiles
from TDMA (time division multiple access) to DS-CDMA (direct sequence
code division multiple access) to MC-CDMA to OFDM, while maintaining a
common hardware platform.
In this chapter, we demonstrate...
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Multiple Access Protocols for Mobile Communications - GPRS, UMTS and Beyond
Ngày tải lên :
02/03/2013, 16:59
... 44
2.5.3 Wireless Local Area Network (WLAN) Standards 46
2.6 Summary 48
3 Multiple Access in Cellular Communication Systems 49
3.1 Multiple Access and the OSI Layers 49
3.2 Basic Multiple Access ... Protocol for Hybrid CDMA/TDMA 12
1.4.1 Why Combine CDMA and PRMA? 12
1.4.2 Hybrid CDMA/TDMA Multiple Access Schemes 14
1.4.3 Literature on Multiple Access Protocols for Packet CDMA 15
1.4.4 Access ... individual portions of
its resources to support multiple communications, basic multiple access techniques (such
as frequency-, time-, or code-division multiple access, with FDMA, TDMA, and CDMA
as their...
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Tài liệu Techniques for Analyzing Food Aroma pptx
Ngày tải lên :
17/02/2014, 10:20
...
p
erform flavor stabilit
y
studies.
At the present time, the two most common procedures reported in the literature for the isolation of
the aromatics are headspace methods and extraction. The former ... transferred. Consequently, for very low levels of analyte concentration in the original sample
material, static headspace techniques may lack the sensitivity required for the determination.
Elevating ... reasons for this include simplicity of operation, no need for
complex apparatus, reproducibility, rapidity, and the range of samples that can be handled. Steam
distillation works best for compounds...
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MEMS-based Circuits and Systems for Wireless Communication docx
Ngày tải lên :
30/03/2014, 07:20
... circuits. Fundamentals of microfabrication techniques
employed for making AlN CMR are briefly introduced. Different methods for
arraying these devices and form either electrically or mechanically ... increasing
recent interest in wireless applications [41–43] has generated new efforts to
miniaturize and integrate the off-chip passives needed for filtering and frequency
generation in communication circuits. ... therefore
enabling multiple frequencies of vibration on the same silicon chip and greatly
reducing manufacturing tolerances to film thicknesses.
In general, the equivalent circuit representation for...
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FED: FUZZY EVENT DETECTION MODEL FOR WIRELESS SENSOR NETWORKS pptx
Ngày tải lên :
30/03/2014, 16:20
... algorithm for highly uniform cluster formation,” in
European Workshop on Wireless SensorNetworks (EWSN 2004), Jan. 2004.
[30] S. Soro and W. B. Heinzelman, “Cluster head election techniques for coverage ... detected events in the lowest and highest sensing ranges for the case of 25%
of message loss is 35% for FEDand 42% for [27]. The results for the case of 15% of message
loss also support the idea. ... International Journal of Wireless & Mobile Networks (IJWMN) Vol. 3, No. 6, December 2011
40
events. The results show thatFED performs better in all the sensing ranges. For instance, FED
detects...
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Báo cáo hóa học: " A novel cross-layer mesh router placement scheme for wireless mesh networks" pptx
Ngày tải lên :
20/06/2014, 22:20
... concept holds true for single channel. For multiple
channel case, it is easy to iterate for C
wmn
in a WMN. If
each channel has the same characteristics, then it is sim-
ply c ì C
wmn
for c subchannels. ... D-cluster formation in
wireless ad hoc networks, in Proceedings of the IEEE International Conference
on Computer Communications,32–41 (2000)
27. S Banerjee, S Khuller, A clustering scheme for hierarchical ... doi:10.1007/978-3-540-71805-5_18
34. IEEE 802.16 - Standard for local and metropolitan area networks, Part 16: Air
Interface for Broadband Wireless Access Systems (2004)
35. H-Y Wei, S Ganguly, R Izmailov,...
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Báo cáo hóa học: "Research Article A High-Accuracy Nonintrusive Networking Testbed for Wireless Sensor Networks" pptx
Ngày tải lên :
21/06/2014, 17:20
... the
dynamics of wireless communications, the frequent failures
of sensor nodes and the variety of the applications for
wireless sensor networks.
Some testbeds or test platforms for wireless sensor ... disturb the
wireless communications of the wireless sensor network at
all. Therefore HINT has no size effects on the spontaneous
network behavior and it is a nonintrusive testbed for wireless
sensor ... networks must be consumed for the purpose
of collecting test data. Obviously, the test platforms of the
latter category do not disturb the wireless communications
of wireless sensor networks at...
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Báo cáo hóa học: " Research Article Capacity of Time-Hopping PPM and PAM UWB Multiple Access Communications over Indoor Fading Channels" ppt
Ngày tải lên :
21/06/2014, 22:20
... TIME-HOPPING
MULTIPLE ACCESS PPM OR PAM UWB SYSTEM
With more than one user active in the system, multiaccess
interference (MAI) is a major factor limiting performance
and capacity, particularly for a ... theorem. This allows the capacity analysis given
in Section 3 for a single user to be extended to a multiple-
access system.
4.1. Multiple- access interference model
Asgivenin(4), the received signal ... Journal on Wireless Communications and Networking
Volume 2008, Article ID 273018, 9 pages
doi:10.1155/2008/273018
Research Article
Capacity of Time-Hopping PPM and PAM UWB Multiple Access
Communications...
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Báo cáo hóa học: "Research Article Efficient Path Key Establishment for Wireless Sensor Networks" ppt
Ngày tải lên :
21/06/2014, 22:20
... standard for Information
Technology—Telecommunications and information exchange
between systems—Local and metropolitan area networks—
Specific requirements, Part 15.4 Wireless Medium Access
Control ... link. Therefore,
6 EURASIP Journal on Wireless Communications and Networking
0
1
2
3
4
5
6
7
8
9
10
Hops
R = 6 R = 8 R = 12
ALG1
ALG2
ALG3
Figure 6:Averagenumberofhopstogetoneproxyforascenario
with ... outperforms both
Noureddine Mehallegue et al. 9
Table 1: Comparison of ALG1, ALG2, and ALG3.
ALG1 ALG2 ALG3
Resolve the path key establishment problem for WSNs
Suitable for sparse WSNs Suitable for...
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Báo cáo hóa học: "Research Article A Real Orthogonal Space-Time Coded UWB Scheme for Wireless Secure Communications" pptx
Ngày tải lên :
21/06/2014, 22:20
... considered for such systems [15]. These works show
performance improvement over the conventional single-
input single-output (SISO) UWB systems for commonly
adopted modulation and multiple- access techniques, ... transmitted power is E. For simplicity,
the random time-hopping (T H) codes for multiple access are
omitted ([13]).
A class of unitary space-time signals is proposed in [16]
for flat-fading channels ... and A. R. Calderbank, “Space-time
codes for high data rate wireless communication: performance
criterion and code construction,” IEEE Transactions on Infor-
mation Theory, vol. 44, no. 2, pp....
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Báo cáo hóa học: " Research Article Analysis of Coded FHSS Systems with Multiple Access Interference over Generalized Fading Channels" ppt
Ngày tải lên :
21/06/2014, 23:20
... and M. B. Pursley, “Error probabilities
for slow-frequency-hopped spread-spectrum multiple- access
communications over fading channels,” IEEE Transactions on
Communications, vol. 30, no. 5, part ... Einarsson, “Coding for a multiple- access frequency-
hopping system,” IEEE Transactions on Communications, vol.
32, no. 5, pp. 589–597, 1984.
[4] A. W. Lam and D. V. Sarwate, Multiple- user interference
in ... that the optimal hop for the
coded FHSS system over Rayleigh fading channel is m
=
32, for all the number of users. In Figure 10, the same
information shown in Figure 9 is shown for Rician fading
channel...
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Báo cáo hóa học: " Research Article Dynamic Session-Key Generation for Wireless Sensor Networks" ppt
Ngày tải lên :
21/06/2014, 23:20
... 4 EURASIP Journal on Wireless Communications and Networking
Table 1: Notation.
h()
Use for the one-way hash function of key
generation
a
j
, a
j−1
Two parameters for generation of key
pre-deployed ... Corporation
EURASIP Journal on Wireless Communications and Networking
Volume 2008, Article ID 691571, 10 pages
doi:10.1155/2008/691571
Research Article
Dynamic Session-Key Generation for Wireless Sensor Networks
Chin-Ling ... 2008
Recommended by Jong Hyuk Park
Recently, wireless sensor networks have been used extensively in different domains. For example, if the wireless sensor node of a
wireless sensor network is distributed...
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Báo cáo hóa học: " Research Article A Multievent Congestion Control Protocol for Wireless Sensor Networks" pptx
Ngày tải lên :
21/06/2014, 23:20
... protocol
that mitigates congestion while providing general event
information, per-node event information, and prioritized
event information for multiple events. Moreover, MCCP
associates a schedule-based ... general event region
information, per-node event information, or multiple events
information, and so forth. Consider a WSN working inside
a mine for the purpose of environmental monitoring and
control. ... Fapojuwo
Wireless sensor networks are application-dependent networks. An application may require general event region information, per-
node event region information, or prioritized event information...
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Báo cáo hóa học: " Research Article Distortion-Based Link Adaptation for Wireless Video Transmission" ppt
Ngày tải lên :
22/06/2014, 01:20
... transmitted off-line 50 times (for statistical
purposes) over the IEEE 802.11 PHY layer for a wide range
of fixed C/N power levels. For each sequence, for each GOP,
and for each C/N, the average received ... known link adaptation techniques such as ARF, for a
given received signal level trace. Validations of our approach
will be performed using a real-time experimental platform.
ACKNOWLEDGMENTS
This ... “Cross-layer wireless
multimedia transmission: challenges, principles, and new
paradigms,” IEEE Wireless Communications,vol.12,no.4,pp.
50–58, 2005.
[5] “IEEE Standard 802.11b—part 11: wireless LAN...
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Báo cáo hóa học: " Research Article Adaptive Optimal Kernel Smooth-Windowed Wigner-Ville Distribution for Digital Communication Signa" pptx
Ngày tải lên :
22/06/2014, 01:20
... window or
kernelwhichwouldperformwellforallsignals.Akernel
might perform very well for a certain class of signals but is
not optimal for other types of signals. For optimal TFR, the
selection ... representation for the ASK signal will also be
represented based on the same binary sequence of “1101,”
for simplicity, and the modulation parameters defined in
Section 2. For this signal, f
k
= f
0
for ... kernel parameters that can give the optimal
performance for every performance measure used in this
paper, simultaneously. Thus, we can conclude that for
the best TFR, the lag-window width and the...
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