Research On Cooperation Communication Based-on Cross-layer For Underwater Wireless Sensor Networks

With the increasement of requirements for the ocean information in the world, peoplebegin to put focus on the research on underwater wireless sensor networks. Underwaterwireless sensor networks consist of a variable number of sensors and vehicles that aredeployed to perform collaborative monitoring tasks over a given area. Underwater sensornodes will find applications in oceanographic data collection, pollution monitoring, offshoreexploration, disaster prevention, assisted navigation and tactical surveillance applications.Moreover, unmanned or autonomous underwater vehicles, equipped with sensors, will enablethe exploration of natural undersea resources and gathering of scientific data in collaborativemonitoring missions. Underwater sensor nodes and vehicles must possess self-configurationcapabilities, coordinate their operation by exchanging configuration, location and movementinformation, and relay real-time monitored data to an onshore station, and in the end to theusers by onshore station or secondary planet.The research on underwater wireless sensor networks is studied by the layer methods inthe wireless sensor networks. Although this simplifies the research, the respective layeroptimization is not able to guarantee the overall networks optimization. Cross layer can makeup for the limitation brought by layer. Its object is to realize the balance between theperformance and the design interaction in protocol layer which is not adjacent in logicalness.The cross layer among the physical, data link and networks balances the performance anddecreases the transition about the control signal. It realized the maximization of saving energyand the extension of lifetime. This is very important to the underwater wireless sensornetworks. The thesis combines underwater communications among underwater devices, takesuse of the cross layer design, considers the physical layer, modulation and forward errorcorrect interaction, media access control and routing interaction. Based on the research onwireless sensor networks, combined with the characteristics of physical layer, thefunctionalities and characteristics are considered in a comprehensive way, the cross layerdesign is studied thoroughly, and the cross layer link transmission algorithm and cross layerlink optimization are proposed which makes the scare resource effective utilization.The simulation experiments show that cooperation communication based-on cross layeris fit for underwater wireless sensor network. The algorithm CLLT and CLLO increase theefficiency and throughout. They also have good stability.