Design And Implementation Of A Hybrid Network Encoding Information Exchange System Based On Vxworks

As an indispensable means of network transmission, wireless communication technology has been widely used. With the increase of the number of users, wireless network is also facing many new challenges. That is, the topology of wireless multi hop network has the characteristics of multi hop dynamic changes. If use the traditional routing mechanism, it is hard to achieve the high efficiency and reliable transmission of data. And the capacity limit of the nodes in the wireless multi hop network, which seriously affects the number of the sensor nodes in the network, can not reach the multi access and high throughput transmission. The network encoding technology provides an effective way to solve the above problems. Network encoding is a fusion of the routing and encoding's information exchange technology, the core idea is to perform a linear or nonlinear processing of the information received from each node in the network, and then forward to the downstream node, intermediate nodes playing the role of the encoder or signal processor. Network encoding has the characteristics of increasing network throughput, saving network bandwidth, improving network robustness, balancing network load and so on. This paper makes full use of the advantages of the network encoding to design a feasible transmission scheme, in order to solve the problem of data transmission in wireless multi hop network, and realize the large capacity transmission of data in the network. Specific research work and innovation are as follows:Firstly, based on the topology of the wireless multi hop network, the information exchange scheme(MNCIE) based on hybrid network is proposed, and the feasibility of the scheme is demonstrated by the inductive deductive method. The scheme divides the data into the extra stream and the inter stream. Corresponding network coding algorithm are adopted according to the characteristics of the different data streams, extra streams using XOR coding and inter stream using random network coding. Through simulation test, the proposed scheme can effectively improve the network throughput and reduce the number of data retransmission. In addition, on the base of the MNCIE designing a Retransmission strategy apply to the wireless multi hop network information exchange system based on the network of encoding. In this method, the features of the broadcast transmission in the encoding algorithm of the network are used to add the function of the response packet tothe encoding packet, which effectively improves the utilization ratio of the network bandwidth and reduces the transmission power of the wireless nodes.Secondly, it realizes the information exchange transmission system based on the hybrid network on the Vxworks embedded platform. On the base of the MNCIE scheme, realizing a multi hop network information exchange scheme based on store and forward is, network encoding information exchange scheme based on delay waiting, and opportunistic network encoding information exchange program. And in order to build a network of encoding information exchange system verification platform, testing the performance of different schemes by this platform. The results show that the MNCIE algorithm can effectively improve the throughput of wireless multi hop networks, and guarantee the reliable transmission of data. In addition, the complexity of MNCIE algorithm is also analyzed. It can be seen from the data analysis that the introduction of the encoding algorithm in wireless multi hop networks has not increased the complexity of the system.