Research Of Network Coding Based On Opportunistic Routing In Wireless Networks

Network coding and opportunistic routing technology are new technologiesthat rise gradually since2000. The network coding technique allows theintermediate nodes to encode the data packets they received and then forward them.The nodes receive the encoded packets can decode the packets with certain rules toobtain the original packet. Network coding provides a realistic way to achieve themaximum network traffic for the network.Between so many network coding methods, random linear network coding hasgot the most attention. The computing of random linear network coding is simple,but the coding vectors’ linearly independent rate will affect the performance ofnetwork coding. The linearly independence of coding vectors impacts decodingprobability, and the factors that impact the linearly independence of coding vectorsare the number of packets decoded and the encoding domain size. This paperidentifies a function between linearly independent rate and the number of packetsencoded, the size of the encoding domain. Then we try to determine the bestcoding domain size and the optimal number of packets encoded. Based on thisfunction relationship, we compare the three classical network coding methodapplied to TCP, and analysis the performance of them.The opportunistic routing technology is a newly proposed wireless networkrouting strategy, it can take advantage of the potential nodes in the wirelessnetwork for packet forwarding, thus, it can improve the reliability andthroughput of the wireless network. The combination of opportunistic routingand network coding techniques theoretically can improve the overall performanceof the network. This paper proposed a new opportunity routing policy andcombined the policy with network coding. This article uses node’ energy andsuccessful transmission rate as a route distance metric, each node rec eiveing datapackets of the same stream encode them and forward them, and the nodes alsoconfirm the packets they have received. Simulation experiments show that,combined with network coding new opportunities routing strategy can balanceenergy consumption of each node of the network, improve the survival time ofnetwork, combined with two new technology can really improve the throughput ofthe wireless network, so as to improve the performance of the network.