PhD Theses: Recent submissions
Now showing items 61-80 of 87
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Design and analysis of distortion reduction techniques in direct conversion receiver
(Dhirubhai Ambani Institute of Information and Communication Technology, 2017)Direct-conversion is alternative wireless receiver architecture to the well-established super heterodyne architecture. Direct-conversion receiver (DCR) can offer highly integrated, low-power and low-cost hardware Solutions ... -
Design of countermeasures for spoofed speech detection system
(Dhirubhai Ambani Institute of Information and Communication Technology, 2017)Automatic Speaker Verification (ASV) systems are vulnerable to speech synthesisand voice conversion techniques due to spoofing attacks.Recently, to encourage thedevelopment of anti-spoofing measures or countermeasures for ... -
Crying for a reason : a signal processing based approach for infant cry analysis and classification
(Dhirubhai Ambani Institute of Information and Communication Technology, 2016)The present work in this thesis is directed towards understanding the reason of crying of an infant using signal processing approaches. Infant cry analysis and classification is a non-invasive method of analyzing the infant ... -
Similarity preserving dimensionality reduction for image data
(Dhirubhai Ambani Institute of Information and Communication Technology, 2016)Data collection and storage capabilities have increased manifold in last few decades,leading to information overload. Number of variables used to represent each data observation is called dimension of the data and dealing ... -
Multi-modal design of an intelligent transportation system
(Dhirubhai Ambani Institute of Information and Communication Technology, 2016)An Intelligent Transportation System (ITS) plays a major role in generating ne grained vehicular tra c information for city wide or larger region. The real time tra c informa-tion is used to optimize tra c movement in a ... -
Bandwidth considerations in miniaturized rectangular dielectric resonator antennas: experimental validation
(Dhirubhai Ambani Institute of Information and Communication Technology, 2016)In this thesis, an issue of bandwidth is considered in a rectangular dielectric resonator antenna (RDRA). Two techniques (merging of modes and stacking) of bandwidth im- provement are introduced with miniaturized resonator. ... -
Efficient methodologies for package/housing effect on active MMIC and signal integrity problems
(Dhirubhai Ambani Institute of Information and Communication Technology, 2016)There has been a great demand in a Computer Aided Design (CAD) tool with a capability of design and analysis of gigahertz system having active Monolithic Microwave -
Peer-to-peer communication in mobile social network
(Dhirubhai Ambani Institute of Information and Communication Technology, 2016)Peer-to-peer opportunistic communication between mobile devices carried by humanswithout using any infrastructure is largely unexploited. As these devices are carried byhumans, their encounter pattern depends on human ... -
Design and analysis of novel receiver front-end sub-systems in Ku-band for satellite applications
(Dhirubhai Ambani Institute of Information and Communication Technology, 2014)A novel receiver front-end; Low Noise Amplifier (LNA), mixer and Local Oscillator (LO); is designed and analyzed in Ku-band. Different design aspects of the subsystems along with the trade-offs and improvements are presented. ... -
Techniques for denoising brain magnetic resonance images
(Dhirubhai Ambani Institute of Information and Communication Technology, 2016)Advances in the computational science joined medical imaging domain to help humanity. It offers great support in clinical practices where automatic Computer Added Systems (CAD) help in identification and localization of ... -
Design and analysis of multiband fractal antenna
(Dhirubhai Ambani Institute of Information and Communication Technology, 2015)Miniaturized Multiband antenna design is an important and challenging task for communication industry. Several constraints like size, position of the antenna, feasibility, reflection coefficient, Specific absorption Rate ... -
Novel approaches for spectral unmixing of hyperspectral data
(Dhirubhai Ambani Institute of Information and Communication Technology, 2014)This thesis addresses the problem of spectral unmixing of remotely sensed hyperspectral data. The spectral unmixing has the objective of quantifying the reectance properties of di_erent materials on the earth. Complete ... -
New techniques for spatial resolution enhancement of hyperspectral images
(Dhirubhai Ambani Institute of Information and Communication Technology, 2014)Vision plays a central role for human perception and interpretation of the world. With the beginning of the space age during late 1950s presented opportunities for remote sensing of earth resources [1]. Multispectral sensors ... -
Detection of tampering in digital images using feature based hash generation
(Dhirubhai Ambani Institute of Information and Communication Technology, 2014)Recent years have witnessed an exponential growth in the use of digital images due to development of high quality digital cameras and multimedia technology. Easy availability of user-friendly image editing software has ... -
Some new methods for multi-resolution image fusion
(Dhirubhai Ambani Institute of Information and Communication Technology, 2016)It is always an interest of a mankind to explore the various resources of the earth such as minerals, agriculture, forestry, geology, ocean etc., Before the invention of the remote sensing, in order to analyze the various ... -
On large scale near-independent blind source separation
(Dhirubhai Ambani Institute of Information and Communication Technology, 2015)The thesis addresses Blind Source Separation (BSS) in Large Scale (LS) and near-Independent (nI) sources scenario. The large scale in BSS imply number of unknown sources ranging from 15 to 140, so that the corresponding ... -
Adaptive channel estimation and loading for OFDM based two-way relay systems
(Dhirubhai Ambani Institute of Information and Communication Technology, 2013)In this thesis we introduce a low complexity Recursive Least Square (RLS) based Orthogonal Frequency Division Multiplexing (OFDM) channel estimation for two-way relay system. Using the estimate of the channel, a bit and ... -
Channel estimation and soft OSIC detection in coherent MIMO-OFDM systems using QRD techniques(802.16m)
(Dhirubhai Ambani Institute of Information and Communication Technology, 2013)Next generation mobile systems will use multiple antennas at the transmitter and receiver to achieve higher capacity and diversity gain at high speeds. By transmitting through multiple transmitting and receiving antennas, ... -
Coordinated adaptive power management (CAPM) technique for sensor network nodes
(Dhirubhai Ambani Institute of Information and Communication Technology, 2013)Small size of wireless sensor nodes limit the size of the battery supported on it which directly limits the capacity of the battery and lifetime of the sensor nodes. Though energy scavenging is one of the solutions, it is ... -
Design automation of analog to digital converters based on geometric programming
(Dhirubhai Ambani Institute of Information and Communication Technology, 2012)The trend towards digital processing of analog signals in an increasing number of application fields has stimulated significant research efforts in the area of data converters implemented in CMOS technologies. Designing ...