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Title Adaptive Rate Network Coding using Raptor Codes for Large Wireless Relay Networks
Degree MS
Author Su-Jung Yoo
Advisor Kiseon Kim
Graduation Date 2011.02.24 File
    Date 2013-09-11 17:04
Large wireless networks with thousands of nodes can be found in many di?erent
areas: sensor networks, transportation networks, and military networks. In particular,
the use of relays in large wireless communication networks guarantees e±cient and
reliable networks. Cooperative communication is well known as a powerful technol-
ogy that provides reliable data transmission by forwarding what relay nodes overhear
from neighbors in wireless networks. The idea of cooperative communications comes
from research streams where multiple nodes equipping single antenna compose virtual
multiple-input multiple-output (MIMO) systems to obtain spatial diversity gain, called
cooperative diversity.
One of the promising cooperative communication technologies, network coding, has
recently emerged with some advantages: bandwidth improvements, power allocation,
energy e±ciency maximization, computational e±ciency and robustness to network
dynamics in wireless networks. The basic idea of the network coding is that interme-
diate relay nodes perform simple coding operations and forward the coded symbol to
a destination. Pre-de?ned network coding schemes are ?rst proposed to increase the
throughput and improve the network performance in lossless relay networks, assuming
that link states between nodes does not change over time. However, such assumption
con°icts with reality since practical networks have link failures and topology changes.
Although channel states and network topologies change with time, most researchers
study ?xed network coding for lossless networks.
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