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Network coding in wireless multihop networks applied research

Author: PanPengGui
Tutor: XuLi
School: Fujian Normal University
Course: Communication and Information System
Keywords: Wireless multi- hop networks Network Coding Routing Protocol
CLC: TN929.5
Type: Master's thesis
Year: 2011
Downloads: 44
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Abstract


Network coding is the 21st century is a major breakthrough in the field of communication, which combines routing and coding concepts that will link information from different signal processing, making the network intermediate nodes to achieve both routing functions and achieve coding functions. Coding structure in the network, the network transmission performance can be achieved the theoretical limit of maximum flow. Multicast network coding can improve the throughput of the network, improve network load balancing, improved network link robustness. In wireless Ad Hoc networks, wireless sensor networks and wireless mesh networks as representative of the wireless multi-hop network (Multi-Hop Wireless Network) is a new type of network. It is an important branch of mobile communications, without center support, convenient network quickly, in the military, medical, scientific, business and many other areas has broad application prospects. However, the wireless network nodes will be affected by its own characteristics lead energy, computing power, transmission bandwidth and storage capacity, and many other constraints, how limited resources to improve network throughput and reliability of data transmission and prolong the network lifetime is Wireless networks of the important issues. This paper first introduces the basic principles of network coding, and from the increase throughput, reduce energy consumption and enhance network robustness and security aspects are summarized in domestic and international network coding in wireless multi-hop network research progress. Secondly, in order to reduce the cluster head node for single copies of data dependence, improve network fault tolerance for packet loss performance monitoring tasks in the wireless base station released when using network coding, and thus do not need to complete the cluster head node receives a packet specified , just received a sufficient number of linearly independent coded packets can successfully recover the original data. Then, the paper presents a differential phase shift keying modulation technique of the physical layer network coding (PNC-DPSK) program and its marketing up ary differential phase shift keying (MDPSK), a new scheme to solve the PSK \Finally, since the conventional wireless routing protocol design principles are possible to reduce or avoid mutual interference of signal transmission, which greatly reduces the chance of physical layer network coding, so that the network throughput can be improved. To solve this problem paper presents a physical layer network coding based wireless network routing protocols, network layer and the physical layer via cross-layer nodes collaborate to enhance interactivity, simulation results show that with no coding, network coding forwarded directly strategy compared to the physical layer network coding combined with routing protocols can be more effectively improve network throughput.

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Wireless communications > Mobile Communications
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