Theses and Dissertations

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    Design of cutom wireless protocol for signal transmission inside space equipment
    (Dhirubhai Ambani Institute of Information and Communication Technology, 2014) Sanghani, Hardik Jayesh; Dubey, Rahul
    There are many sensors and devices inside the satellite. All these devices need to communicate with each other, those devices can be sensor nodes or control device. According to current technology communication between different sensor nodes inside the satellite is wired, which adds the weight of the harness cable. It will be reliable if the communication between them is made wireless. Protocol satisfying communication standards at low data rate and short range wireless networking must be developed. Protocol which is suitable to meet our requirements is available in the market in commercial packages, but the commercial standard devices cannot provide the efficient functionality in space as they are not resistant to the various radiation effects taking place in space. So our aim is to design a protocol in hardware description languages which can be embedded in radiation resistant series of space Grade FPGA. The baseband transceiver proposed in this thesis uses OQPSK modulation, Pseudo noise spread spectrum is used for coding and sinusoidal pulse shaping having theoretical bandwidth efficiency of 2bits/Hz same as QPSK and OQPSK is used for baseband processing. The transceiver is initially simulated in MATLAB Simulink and then in Verilog HDL by the MODELSIM simulator.
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    Generalized data extraction protocol for habitat monitoring applications in WSNs
    (Dhirubhai Ambani Institute of Information and Communication Technology, 2011) Hemnani, Deepak Manohar; Srivastava, Sanjay
    Habitat monitoring applications use WSNs to gather data about environment and migration patterns of animals. This data is used by biologists to analyze the life and behavior of animals in different environments. The application involves designing of WSN nodes to tag the animals and running protocols to gather and exchange information to be collected at the base station. Given the limited resources i.e. energy and memory, there is a need for an energy efficient and memory efficient data extraction protocol. We take in to consideration previous work done in Zebra net and wild CENSE to formulate a generalized protocol which could be implemented as is. The protocol parameters are defined as symbols which are based on application parameters. My work involves identifying the gaps in the previous work done for habitat monitoring. Filling the gaps and coming up with a generalized protocol and finally providing formulation for the protocol in terms of application parameters.
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    Traffic profile measurement and traffic driven network reconfiguration
    (Dhirubhai Ambani Institute of Information and Communication Technology, 2011) Monga, Jasneet Kaur; Srivastava, Sanjay
    In multi hop ad hoc network, nodes are constrained by the power or the energy sources that are available. Efficient algorithms for saving the energy are required to manage the network in such a manner that the resources available, get properly utilized and nodes in the network do not drain out. Switching and working over idle and busy periods of a node, one can achieve this dual goal and it comes under the category of sleep scheduling. In this approach, the basic emphasis is on the traffic profiles of the network nodes which is estimated based on the network traffic flows. The traffic estimated becomes the weight of the path between the different source destination pairs available in the network and this value averaged either at the local level or the global level is needed to be reduced, hence saving the overall energy of the network. The traffic weighted paths which consume energy above the average or the threshold value become the prime candidates for the consideration. The aim is to go for shorter and lighter paths in the network which require the sleeping nodes in the proximity of heavy and longer paths to be awaken to be a part of network topology and saving the extra energy wasted on longer paths. This makes the nodes in longer paths go through a sleep state so that they can be utilized when they are required, hence making topology changes by reconfiguring the paths.
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    Buffer aware routing in interplanetary ad hoc network
    (Dhirubhai Ambani Institute of Information and Communication Technology, 2007) Mistry, Kamal; Srivastava, Sanjay; Lenin, R. B.
    Recent research has shown that existing TCP/IP protocol suit exhibits poor performance in space communication networks. To deal with communication challenges in deep space such as long propagation delay, high channel error rate, limited bandwidth etc. the architecture called Interplanetary Ad hoc Network (IPAN) is envisioned to establish a communication infrastructure in environment which allows to connect planets, natural and artificial satellites, and various mission elements such as space- crafts and rovers. The communication links in IPANs possess the properties of low bandwidth, high error rate, high latency and link unavailability for longer period of time. Nodes in such networks are resource constrained in terms of storage, energy and processing power. This work proposes a probabilistic routing protocol called \Buffer Aware Routing Protocol in Interplanetary Ad hoc Network (BARPIN)" based on the store and forward principle of Delay Tolerant Networking (DTN). Here IPAN is modeled as the network of two kinds of nodes, one having deterministic mobility patterns with greater resources and the others having random movement patterns with limited resources in terms of storage and energy. The delivery ratio performance measure of BARPIN is studied for different network conditions by changing field sizes, traffic rates, available resources on various nodes and for different source-destination pairs. Further we propose a model to estimate the minimum required buffer size of nodes for different data rates to reduce the packet loss due to buffer overflow, and justified the simulation results with analytical results.