range of 802 11 g wireless networks
báo cáo hóa học:" Research Article Linking Users’ Subjective QoE Evaluation to Signal Strength in an IEEE 802.11b/g Wireless LAN Environment" doc
Ngày tải lên :
21/06/2014, 18:20
... in case of a lower signal
strength of
−81.5 dBm, the predicted average rating of Q6 is
2.2. This value can be found at the left side of the tree. In
case of greater signal strength (e .g. ,
−69.5 ... weighs 140 g and has a 2.7” screen with a
color display. It incorporates GSM/GPRS/EDGE, WiFi (IEEE
802. 11b /g) , and Bluetooth. The device has 128 MB of storage
memory and 64 MB of RAM. This high-end ... available signal strength,
for example, average ratings of 4.3
∼4.4 for perceived speed
and general experience were obtained at a location with
high signal strength, while the average ratings decreased
to...
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Báo cáo hóa học: " Research Article Centroid Localization of Uncooperative Nodes in Wireless Networks Using a Relative Span Weighting Method" pot
Ngày tải lên :
21/06/2014, 23:20
... difference of 300 meters, resulting in
a margin of location error greater than the FCC regulations
for E 911 location accuracy. The RSS values of a given message
may be used to estimate a set of transmitter-receiver ... [17] and localizes the
transmitting source of a message to the (x, y) coordinates
obtained from averaging the coordinates of all receiving
devices within range. Weighted centroid localization (WCL),
as ... be the set of
all receivers within range of a given message M
T
originating
from an uncooperative transmitter T.LetΥ denote the set
ofRSSvaluesmeasuredateachreceiverR
i
∈ R for message
M
T
, such...
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Tài liệu Guide to Securing Legacy IEEE 802.11 Wireless Networks ppt
Ngày tải lên :
14/02/2014, 08:20
...
A-1
GUIDE TO SECURING LEGACY IEEE 802. 11 WIRELESS NETWORKS
2. Overview of IEEE 802. 11 Wireless Local Area Networks
Wireless local area networks (WLAN) are groups of wireless networking nodes ...
resulting byte value of 110 0111 1.
4-2
GUIDE TO SECURING LEGACY IEEE 802. 11 WIRELESS NETWORKS
vulnerabilities to the technologies, readers are strongly encouraged to take advantage of other ... used forms
of WLAN technologies: IEEE 802. 11a, 802. 11b, 802. 1 1g, and 802. 11n. In addition, a brief overview of
the updated security standard for IEEE 802. 11 networks, IEEE 802. 11i, is provided....
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building secure wireless networks with 802.11
Ngày tải lên :
25/03/2014, 11:08
... devices, as 802. 1 1g provides the
backward compatibility that 802. 11a does not. However, 802. 11a operates in a less congested RF
band than 802. 1 1g does.
802. 1 1g Limitations
Though 802. 1 1g devices ... upgrade the 802. 11b users to 802. 1 1g.
WISPs
WISPs would find it attractive to deploy the 802. 1 1g devices, as this would enable a broader user
base to access the services they offer.
802. 1 1g Interoperability ... being used to secure wireless LANs. We
talk about security requirements of wireless LANs, the IEEE 802. 11 security architecture, the
shortcomings of 802. 11 security protocols, the future of 802. 11...
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802.11 wireless networks the definitive guide second edition
Ngày tải lên :
05/05/2014, 12:46
... tolls.
TGr (future
802. 11r)
Enhancements to roaming performance.
TGs (future
802. 11s)
Task group enhancing 802. 11 for use as mesh networking technology.
TGT (future
802. 11T)
Task group designing test ... ever-expanding edge. With
wireless LAN technology becoming commonplace, that edge is now blurring.
Chapter 2, Overview of 802. 11 Networks, describes the overall architecture of 802. 11 wireless LANs.
802. 11 ... third working group, 802. 3. Wireless LANs were the eleventh working group formed, hence
the name 802. 11.
Chapter 2. Overview of 802. 11 Networks
Before studying the details of anything, it often helps...
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báo cáo hóa học: " Handoff optimization in 802.11 wireless networks" pot
Ngày tải lên :
21/06/2014, 02:20
... RESEARCH Open Access
Handoff optimization in 802. 11 wireless networks
IP Hsieh and Shang-Juh Kao
*
Abstract
In 802. 11 wireless networks, a complete handoff procedure for a mobile node ... though DP is
higher than DPT. The purpose of beta is to control the
probability of the acceptance of new incoming calls.
Since the ELFGCP is a user count-based CAC
Figure 7 Messages exchanged of ... [http://www.wifly.com.tw/].
doi:10 .118 6/1687-1499-2 011- 30
Cite this article as: Hsieh and Kao: Handoff optimization in 802. 11
wireless networks. EURASIP Journal on Wireless Communications and
Networking 2 011 2 011: 30.
Submit...
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Báo cáo hóa học: " Research Article Design and Implementation of a Lightweight Security Model to Prevent IEEE 802.11 Wireless DoS Attacks" pdf
Ngày tải lên :
21/06/2014, 05:20
... 2008.
[7]W.Chen,D.Chen ,G. Sun,andY.Zhang,“Defending
against jamming attacks in wireless local area networks, ” in
Proceedings of the 4th International Conference on Autonomic
and Trusted Computing: Bringing Safe, ... performance of the IEEE 802. 11 wireless networks.
Hindawi Publishing Corporation
EURASIP Journal on Wireless Communications and Networking
Volume 2 011, Article ID 105675, 16 pages
doi:10 .115 5/2 011/ 105675
Research ... 8021 1MgmtSTA-STSF and 8021 1MgmtAP-
STSF, respectively. The ACFNC source code to secure time
synchronization in the access point and wireless stations is
included in the 8021 1MgmtAP-STSF and 8021 1MgmtSTA-
STSF...
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Báo cáo hóa học: " Research Article Achievable Throughput-Based MAC Layer Handoff in IEEE 802.11 Wireless Local Area Networks" pptx
Ngày tải lên :
21/06/2014, 23:20
... pages
doi:10 .115 5/2009/467315
Research Article
Achievable Throughput-Based MAC Layer Handoff in
IEEE 802. 11 Wireless Local Area Networks
SungHoon Seo,
1
JooSeok Song,
1
Haitao Wu,
2
and Yongguang ... 10.1.2.1
s5
10.1.1.5
10.1.1.1
s1
10.1.1.2
s2
s4
10.1.1.4
s3
10.1.1.3
nAP
10.1.1.100
Windows PCs (XP)
Gigabit Ethernet
AP 802. 11b
channel #1
Windows laptop
(Vista) 802. 11b NIC
Windows laptops
(XP) 802. 11b NIC
AP 802. 11b
channel #11
Wireless
network
monitor
(NetMon)
10.1.1.10
n1
10.1.2.10
n0
10.1.1.20
n2
10.1.1.30
n3
10.1.1.40
n4
10.1.1.50
n5
Figure ... mean of the loaded trafficforall
APs. Figure 15 is a plot of the CV as a function of the number
of STA. As N increases, the CV of every mechanism is
gradually reduced. The reducing slope of LLF...
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Báo cáo hóa học: " A New MAC Protocol with Pseudo-TDMA Behavior for Supporting Quality of Service in 802.11 Wireless LANs" docx
Ngày tải lên :
22/06/2014, 22:20
... Chamber of Greece.
George K. Karagiannidis wasborninPi-
thagorion, Samos Island, Greece. He re-
ceived his university degree in 1987 and his
Ph.D. degree in 1999, both in electrical en-
gineering, ... “A survey
of quality of service in IEEE 802. 11 networks, ” IEEE Wireless
Communications, vol. 11, no. 4, pp. 6–14, 2004.
[13] J. Deng and R S. Chang, “A priority scheme for IEEE 802. 11
DCF access ... Patras, Greece. His main
interests are wireless networks, quality of
service, and network management.
Ioannis Papapanagiotou has been studying
in the Electrical and Computer Engineering
School of...
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o'reilly-802.11 wireless networks- the definitive guide
Ngày tải lên :
04/07/2014, 08:47
... 802. 11a: 5-GHz OFDM PHY
Section 11. 1. Orthogonal Frequency Division Multiplexing (OFDM)
Section 11. 2. OFDM as Applied by 802. 11a
Section 11. 3. OFDM PLCP
Section 11. 4. ... an ever-expanding edge. With
wireless LAN technology becoming commonplace, that edge is now blurring.
Chapter 2 describes the overall architecture of 802. 11 wireless LANs. 802. 11 is
somewhat ... aspects of
wireless LANs, from operations to deployment to monitoring:
• Network architects contemplating rolling out 802. 11 equipment onto networks or
building networks based on 802. 11
• Network...
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Hardening IEEE 802.11 wireless networks pot
Ngày tải lên :
08/08/2014, 09:22
... commence; 802. 11a is the next generation in the wireless
world after 802. 11b, and is a very close in design and function to 802. 11b. 802. 11a
operates in the 5 Ghz range and offers up to 54 Mbps of bandwidth ... discussion of WEP security and 802. 1X
16
Bernard Aboba, Microsoft, Wireless LANS: the 802. 1X Revolution, Dec 2001.
17
Nokia C110/C 111 802. 11b cards support station-unique WEP keys.
Hardening IEEE 802. 11 ... Hardening IEEE 802. 11 wireless networks
Copyright EWA Canada 2002
11
exist to discover WLANs through the process of “war driving” do so by
broadcasting Probes on all channels and looking for responses...
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802.11® Wireless Networks: The Definitive Guide phần 1 pot
Ngày tải lên :
14/08/2014, 13:20
... 802. 11a: 5-GHz OFDM PHY
Section 11. 1. Orthogonal Frequency Division Multiplexing (OFDM)
Section 11. 2. OFDM as Applied by 802. 11a
Section 11. 3. OFDM PLCP
Section 11. 4. ... LAN technology. Management
features for 802 networks are specified in 802. 1. Among 802. 1's many provisions are
bridging (802. 1d) and virtual LANs, or VLANs (802. 1q).
802. 11 is just another ... aspects of
wireless LANs, from operations to deployment to monitoring:
• Network architects contemplating rolling out 802. 11 equipment onto networks or
building networks based on 802. 11
• Network...
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802.11® Wireless Networks: The Definitive Guide phần 2 ppsx
Ngày tải lên :
14/08/2014, 13:20
... Encapsulation of Higher-Layer Protocols Within
802. 11
Like all other 802 link layers, 802. 11 can transport any network-layer protocol. Unlike
Ethernet, 802. 11 relies on 802. 2 logical-link control ... the backoff time is selected from a larger range each time a transmission
fails. Figure 3-7 illustrates the growth of the contention window as the number of
transmissions increases, using the ... are transmitted from left to right, and the most
significant bits appear last.
Figure 3-9. Generic 802. 11 MAC frame
802. 11 MAC frames do not include some of the classic Ethernet frame features,...
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802.11® Wireless Networks: The Definitive Guide phần 3 doc
Ngày tải lên :
14/08/2014, 13:20
... before beginning the
EAPOL exchange and the EAPOL-Key frame that follows the EAP-Success frame. The
figure also omits the closing EAPOL-Logoff message.
Figure 6-9. EAPOL exchange on an 802. 11 network ... group I (TGi) of the
802. 11 working group. With no standard available, I have elected to describe how 802. 1x
works on LANs to provide a basic understanding of how the future 802. 11i specification ... 802. 1x
802. 1x brings a number of enhancements to 802. 11 networks. Instead of deploying of
Mobile IP, it might be possible for user-specific VLANs to be dynamically assigned
using the RADIUS tunnel...
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