پديد آورنده :
شيخ زفره، محمد
عنوان :
ارائه مدلي تحليلي براي ارزيابي و تخمين ظرفيت انتقال شبكه هاي حسگر صوتي زيرآب
مقطع تحصيلي :
كارشناسي ارشد
محل تحصيل :
اصفهان: دانشگاه صنعتي اصفهان، دانشكده برق و كامپيوتر
صفحه شمار :
نه، [103]، [II]ص.: مصور، جدول،نمودار
يادداشت :
ص.ع. به: فارسي و انگليسي
استاد راهنما :
پژمان خديوي
استاد مشاور :
مسعود رضاهاشمي
تاريخ نمايه سازي :
05/06/87
استاد داور :
حسين سعيدي، امير برخي
دانشكده :
مهندسي برق و كامپيوتر
چكيده فارسي :
به فارسي وانگليسي: قابل رؤيت در نسخه ديجيتال
چكيده انگليسي :
AbstractOne approach for ocean bottom and column monitoring is to use oceanographic sensors recordthe data and recover the instruments This approach creates long lags in receiving the recordedinformation In addition if a breakdown occurs before recovery all the data is lost Anappropriate solution for these applications is to design an underwater acoustic network UWA in order to establish real time communication between the underwater instruments However underwater networking has several challenges While many underwater applications requirelong term monitoring of the deployment area the battery powered network nodes limit thelifetime of UWA networks On the other hand underwater acoustic channel characterized bylow available bandwidth highly varying multi path and large propagation delays In addition the path loss in underwater acoustic communication channels depends not only on the distancebetween the transmitter and receiver as it is the case in many other wireless channels but alsoon the signal frequency significantly Within such an environment designing an UWA networkthat maximizes throughput and reliability while minimizing the power consumption becomesa very difficult task One of the questions that arise naturally at this time is that if two transmitters that theirrelevant receivers are in the vicinity of each other send their data at the same time the Signalto Interference ratio SIR decreases at the receivers Hence what are the fundamentalcapabilities of underwater networks in supporting multiple nodes that wish to communicate to or through each other over an acoustic channel in order to satisfy the QoS requirements While research has been extremely active on assessing the capacity of wireless radio networks no similar analyses have been reported for underwater acoustic networks In this thesis an analytical model for evaluation and estimation of the transmission capacityof underwater sensor networks is proposed The transmission capacity is defined as themaximum permissible density of simultaneous transmissions that satisfy a minimum thresholdof signal to interference ratio for the receivers in the network In order to determine thiscapacity two different scenarios are assumed In the first scenario it is assumed that thedistance between source and destination is a fixed value while in the second model a powercontrol mechanism is assumed to be available in the network architecture In both of thesemodels Direct Sequence CDMA DS CDMA is assumed to be used in the physical layer ofthe network Cases that we don t use spread spectrum in the physical layer are special cases ofDS CDMA where spreading gain is equal to unity By assuming that the transmitters aredistributed like a Poisson point process and using the properties of this type of distribution thecapacity of underwater acoustic sensor networks for these two models is derived Simulationresults support the analysis
استاد راهنما :
پژمان خديوي
استاد مشاور :
مسعود رضاهاشمي
استاد داور :
حسين سعيدي، امير برخي
