Improving decision-making performance through argumentation: An argument-based decision support system to compute with evidence

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دانلود مقاله Performance Evaluation of Network Coding in IEEE 802.11 Wireless Ad Hoc Networks - انتشار 2014

اختصاصی از فی توو دانلود مقاله Performance Evaluation of Network Coding in IEEE 802.11 Wireless Ad Hoc Networks - انتشار 2014 دانلود با لینک مستقیم و پر سرعت .

Ad Hoc Networks

Volume 16, May 2014, Pages 131–141

Kyu-Hwan Lee, Sunghyun Cho, Jae-Hyun Kim

Abstract
We evaluate the practical network coding (NC) gain in a wireless ad hoc networks.
First, we introduce how network coding can be applied to IEEE 802.11
ad hoc networks. Next, we find obstructive factors by which the NC gain
may decrease as compared with the theoretical NC gain. Finally, through
the performance evaluation, we analyze why a performance difference occurs
between practical and theoretical NC gains owing to the suggested obstructive
factors. According to the simulated results, even though there is some
overhead caused by the characteristics of the media access control (MAC)
protocol and control signals to apply NC to wireless ad hoc networks, the
practical NC gain is almost the same as the theoretical gain in an ideal environment
for NC. However, in the NC system with the hidden node problem,
the NC gain decreases because of packet collision. In the NC system using
a promiscuous mode where packet overhearing is possible, nodes consume
more power than the conventional system because of overhearing packets.
For instance, when the number of overhearing nodes not related to NC is set
to 15, the power reduction rate is −38.04%. Furthermore, under the network
conditions inappropriate for NC, such as asymmetric flows and scarce coding
structures, the NC gain can be considerably reduced. For example, in
5x5 and 7x7 grid topology networks, the load reduction rate by NC are only
4.12% and 7.01%, respectively. Therefore, research to solve the suggested
obstructive factors is necessary to achieve sufficient NC gain in a practicalwireless network such as an IEEE 802.11 ad hoc networks.

Keywords: Network coding, Wireless ad hoc network, Wireless LAN,
Performance evaluation.