Based On Opnet Digitized Battlefield Wlan Simulation And Applied Research

Ad hoc network is a wireless mobile network which works in the unstructured and self-organization environment. It can be applied to the military occasion or particular situation. For example, to initiate and promote rapid battlefield forces, help the army deploying or going forward in the battlefield, and the rescue after earthquakes or floods. In the absence of network infrastructure, Ad hoc networks can be rapidly deployed, each node in the network can move as both a server and a router. The Ad hoc network can organize fast, flexibly, and can still work if there is no wire circuitry, it will be used broadly.This thesis describes the structure of ad hoc network first, focuses on the study of route technology which is the key technology in ad hoc especially. DSDV bases on route table, uses sequence number to avoid the appearance of router circle. DSR bases on source route, uses cache of route with little spending in network, and old route exists. AODV, as the synthesis of DSR and DSDV, depends on middle nodes to establish and maintenance route table, uses sequence number to avoid the appearance of router circle, supports the function of group broadcast and QoS, uses IP address, depends on the network link and doesn't support signal orientation channel, results of protocols mentioned above and makes a particular analysis in OPNET. We find a ADHOC protocol for digital battlefield , and offer referrence to study Ad Hoc network.This thesis has six chapters as below:Chapter 1 introduces research background and meaning of this thesis, also introduces characteristic and research hotspot of Ad hoc network.Chapter 2 introduces basic knowledge of Ad hoc network, Including of developing history, definition and system structure of Ad hoc network, and wide application in reality.Chapter 3 is the emphasis of this thesis. We study popular route protocols in Ad hoc network: Including of DSDV (Destination-sequenced Distance Vector), AODV (Ad-hoc On-Demand Distance Vector Routing Protocol), DSR (Dynamic Source Routing Protocol), etc. We analyze characteristic and performance of the protocols described above.In chapter 4, we refers to a network emluator—OPNET, introduce modeling mechanism of OPNET and emulation mode for AdHoc.Chapter 5, we use OPNET to simulate the protocols introduced in chapter 3, and choose four network performance parameters (delay, package delivery ratio, route expenses) to analyze the results. Introducing the conception of Multi-paths routing protocol, building the mathematical model for Multi-path routing and analyzing it based on mathematics .Chapter 6 summarizes this paper, at the same time, suggestions for research are given.