Theses and Dissertations

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Subject: search.filters.subject.Coding theory

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    Transmultiplexer design using different filters
    (Dhirubhai Ambani Institute of Information and Communication Technology, 2010) Shiyani, Bhavin R.; Chakka, Vijaykumar
    Transmultiplexer is one of the applications of Filter banks, which is used to transmit many signals simultaneously through a single channel and so that to separate at receiving end. Design of transmultiplexer using prototype filters (low pass filters and band pass filters) has been studied and analysed with respect to complexity. Transmultiplexer design using complexity efficient polyphase structure has been studied and analysed in this thesis. In this thesis, different complexity efficient structures better than polyphase using CIC based structure, multistage CIC based structure, two stage CIC based decimator and multistage CIC based structure with compensator have been proposed. Performances of proposed structures are analysed (analysis of pass-band fluctuation, stop-band attenuation of each filter in transmultiplexer) in MATLAB environment with different classes of input like speech and image. This thesis also considers complexity of proposed structures.
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    Video compression using color transfer based on motion estimation
    (Dhirubhai Ambani Institute of Information and Communication Technology, 2008) Reddy, Pandu Ranga M.; Mitra, Suman K.
    Many compression techniques were developed in last decade and are being used in many applications like HDTV, Videoconferencing, Videophone, multimedia work stations and mobile image communications. It is also certain that digital video will have a significant economic impact on the computer, telecommunications, and imaging industries. Compression that is obtained by standard compression schemes for color video can be further increased if we can take the advantage of color information of successive images of a scene. The color of the objects in the present frame will be almost similar to the color of it in previous frame. So color can be applied at decoder, even if the information is not known for all frames of a scene. The main objective of this thesis is to propose schemes for different profiles of MPEG-2 which uses color transfer techniques. The proposed schemes are tested with different sequences and are compared with the MPEG-2 coded sequences.
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    Design of low power and high speed decoder for 1MB memory
    (Dhirubhai Ambani Institute of Information and Communication Technology, 2008) Gupta, Punam Sen; Nagchoudhuri, Dipankar
    Technology scaling is accompanied by rise in leakage power dissipation. This thesis proposes a voltage controllable circuit in the feedback path of the decoder, which drastically reduces the standby leakage current with minimum loss in speed and slightly overheads in terms of chip area. This circuit generates slightly lower supply voltage when the load circuitry is in the standby mode thereby raises the Vt of the CMOS transistors and hence reduces leakage power dissipation The overall power dissipation of a 7x128 decoder is reduced from 0.928mW to 0.584mW for 1Mb Memory with voltage controllable circuit, namely 37% lowering in power dissipation. The operating voltage for the design is 1.2 V. Layout is done in magic 7.1 version in 180nm technology. The simulations are done in LT spice.
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    Localization for a habitat monitoring sensor network for ground turtles
    (Dhirubhai Ambani Institute of Information and Communication Technology, 2007) Jain, Shubham; Ranjan, Prabhat
    This thesis work deals with the localization problem (i.e. finding the location of the sensor nodes) in sensor networks. This work is specifically concerned with the localization of the sensor nodes on small ground turtles in the campus of Wildlife Institute of India (WII), Dehradun, India. The location information about the turtle node will be helpful to the scientists at WII to conserve the turtles. The wildlife scientists are interested in knowing the places where turtles go, what food they eat and the temperature and humidity of the place where they hibernate. The primary purpose of the sensor network deployment is habitat monitoring and not location determination. The energy constraint which sensor networks usually have is partly removed by deploying a grid of fixed nodes which have electric supply. But the nodes on turtles have this constraint and the lifetime of the nodes on turtles can be roughly one year. There is a weight constraint. The weight of the node on turtles cannot be more than 25 gms. This constraint restricts the measurement technique that can be used for the localization. So Received Signal Strength or range-free localization will be used. The location information cannot be just 2D as the terrain in the WII campus is not flat surface but has highs and lows. So 3D location information will be available through the algorithm. Also, the network is not static as the turtles move although with a slow speed of about 10 cm/s. The accuracy of the location can be 10 m as the primary motive of this application is to find where the turtles go for eating food. This thesis report does not contain implementation details about the project although some details about the prototype network to be deployed are given. Also, there is a comparison of two localization algorithms that can be used for the implementation.