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An Optimized Transmission Algorithm Based on Network Coding in Wireless Network

Author: CaoZhiGang
Tutor: HuangBenXiong
School: Huazhong University of Science and Technology
Course: Communication and Information System
Keywords: Network coding Multicast Route-aware Matching algorithm
CLC: TN911.22
Type: Master's thesis
Year: 2011
Downloads: 27
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Abstract


The proposed network coding can achieve the theoretical limit , the maximum flow minimum cut theorem ceiling multicast transmission network , which makes many researchers have carried out extensive research on network coding . Recently , the use of network coding to improve the performance of the wireless network has also attracted more and more people interested . Due to the broadcast nature of the radio channel , the network coding shows great advantages in terms of bandwidth efficiency and encoding and decoding opportunity creation , people are increasingly concerned about its wireless network . Wherein how to reduce the number of transmissions in the same channel quality , and improve network utilization, has been one of the objectives of inquiry related scholars . Firstly for bulk data packet loss occurs during the broadcast , how to use network coding to reduce the number of retransmissions as much as possible . Once a packet loss occurs during transmission , the radio channel is not reliable need to source broadcasting retransmission . Is given by the matrix and vector arithmetic algebraic expressions be retransmitted data can be encoded , and then based on the correlation matrix construction Figure find coding opportunities optimization , and gives the best match in graph theory theory algorithm. This algorithm not only able to identify all the coding opportunities , but also to consider how to conduct the matching combination , so that the encoded data packet is as small as possible , thereby achieving the optimization of the encoding . The simulation results show that the algorithm is effective to improve the performance and throughput of the network transmission . Next, in the case of multi-hop transmission optimization problem . [ 1] , the multi - hop transmission, the combination of network coding, routing perceptual coding (DCAR) algorithm , the algorithm overcomes opportunity encoding (COPE [ 2 ] ) on the route of the dependence and the limit on the number of hops ( limited to the two-hop ). However , the algorithm is limited to use a so-called best route , which may cause local link congestion . In addition , when the encoding node has multiple streams intersection , this article using random combinations of methods to solve , this method is generally difficult to close to the optimal solution . Based on this, the combination of minimum cost maximum flow algorithm and empower the matching algorithm proposed coding -aware minimum cost routing (CAMCR) algorithm , optimized processing route and coding process , effectively improve its performance .

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Communicate > Communication theory > Information Theory > Channel coding theory
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