Browsing by Issue Date
Now showing items 21-40 of 1001
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On wavelets and fractal modulation
(Dhirubhai Ambani Institute of Information and Communication Technology, 2004)The thesis considers a communication problem - that of communicating over a channel having simultaneously unknown bandwidth and unknown duration. As a solution to this problem, the thesis looks into a modulation scheme - ... -
Space-time coding techniques for multiple antenna communications
(Dhirubhai Ambani Institute of Information and Communication Technology, 2004)Mobile communications has seen an explosive growth in the past decade. The reason for this growth can be traced to the increasing demand by the consumers for communication systems capable of exchanging information “anytime, ... -
Study and development of computer aided tool for transceiver system design
(Dhirubhai Ambani Institute of Information and Communication Technology, 2004)The aim of this thesis is to develop the GUI-based interactive software, which assists in designing transceiver for any modern communication system including GSM, CDMA, HIPERLAN, and WLAN. There are many trade-offs between ... -
Technique to improve revocation mechanism and enhancement of CA's services
(Dhirubhai Ambani Institute of Information and Communication Technology, 2004)Public Key Cryptography [PKC] is becoming popular in the world of security because of its promising features like authentication and non-repudiation along with integrity and data confidentiality. It has been possible to ... -
Voronoi diagram modelling for wireless Ad-Hoc sensor network coverage
(Dhirubhai Ambani Institute of Information and Communication Technology, 2004)This thesis aims at a basic geometrical understanding of Voronoi diagrams and Voronoi diagram modelling for Wireless Ad hoc Sensor coverage. What is known as the Fortune algorithm for constructing Voronoi diagrams is ... -
Chaotic communication system for IEEE 802.11b (WLAN)
(Dhirubhai Ambani Institute of Information and Communication Technology, 2004)Today's WLAN (IEEE 802.11b) is most attractive solution for wireless data communication at higher rate. Chaotic signals, by virtue of their wideband characteristic, are natural candidates for wideband communication ... -
Speech enhancement using microphone array for hands-free speech applications
(Dhirubhai Ambani Institute of Information and Communication Technology, 2004)This thesis addresses the problem of multi-microphone speech enhancement using GSVD (Generalized singular value decomposition) based optimal filtering algorithm. This algorithm does not require any sensitive geometric ... -
Performance analysis of diffserv multicast (DSMCast) for heterogeneous receivers
(Dhirubhai Ambani Institute of Information and Communication Technology, 2004)Internet is a large infrastructure that provides means for global communication. One of the biggest challenges faced in its growth and maintenance is the provision for the best Quality of Service (QoS) to the end-user ... -
Design of architecture of artificial neural network : design and construction of a model for creation of an architecture of artificial neural network based on distributed genetic algorithms
(Dhirubhai Ambani Institute of Information and Communication Technology, 2004)The objective of the work is to design and construct a model for creation of architecture of feed forward artificial neural network. The distributed genetic algorithms are used to design and construct the system. This ... -
Hybrid approach to speech recognition in multi-speaker environment
(Dhirubhai Ambani Institute of Information and Communication Technology, 2004)Recognition of voice, in a multi-speaker environment involves speech separation, speech feature extraction and speech feature matching. Traditionally, Vector Quantization is one of the algorithms used for speaker recognition. ... -
Design and implementation of a framework for context aware mobile services
(Dhirubhai Ambani Institute of Information and Communication Technology, 2004)Applications designed for mobile platforms are traditionally hampered by the limita¬tions of the client devices, in particular limited user interface and the change of user environment due to mobility. Incorporating location ... -
ACIDS: automated co-stimulation based intrusion detection system with a sense of dynamic self
(Dhirubhai Ambani Institute of Information and Communication Technology, 2005)Automated Co-stimulation based Intrusion detection system with a sense of Dynamic Self, or ACIDS, is a distributed architecture for intrusion detection systems. Other than the already used aspects of human immune systems ... -
Routing and wavelength assignment in DWDM networks
(Dhirubhai Ambani Institute of Information and Communication Technology, 2005)All-Optical Networks employing Dense Wavelength Division Multiplexing (DWDM) are believed to be the next generation networks that can meet the ever-increasing demand for bandwidth of the end users. The problem of Routing ... -
Shorted microstrip patch antenna
(Dhirubhai Ambani Institute of Information and Communication Technology, 2005)In this thesis, electrically small microstrip patches incorporating shorting posts are thoroughly investigated. These antennas are suitable for mobile communications handsets where limited antenna size is a premium. In ... -
Novel local oscillator circuit for sub-harmonic mixer
(Dhirubhai Ambani Institute of Information and Communication Technology, 2005)Direct Conversion RF transceiver is the enabling technique for the next generation cellular and personal communication devices striving for miniaturization, long life of battery and cost effectiveness. Existing techniques ... -
Model for grid service instance migration
(Dhirubhai Ambani Institute of Information and Communication Technology, 2005)Grid computing, emerging as a new paradigm for next-generation computing, enables the sharing, selection, and aggregation of distributed resources for solving large-scale problems in science, engineering, and commerce. The ... -
Knowledge management techniques towards answering engine
(Dhirubhai Ambani Institute of Information and Communication Technology, 2005)The growth of Internet era has brought magnitude of information at the disposal of end user being mobilized with the speed of electron. But this bless of information comes with a curse of ‘information overload’. Answer ... -
Multiple watermarking schemes for copyright protection
(Dhirubhai Ambani Institute of Information and Communication Technology, 2005)Recent advances in digital communication and storage technologies have brought major changes for consumers. High capacity hard disks and DVDs can store a huge amount of audiovisual data. In addition, faster Internet ... -
Traitor tracing for xml documents
(Dhirubhai Ambani Institute of Information and Communication Technology, 2005)Electronic documents are more easily copied and redistributed than paper documents. This is a major impediment to electronic publishing. One needs to think of various copy protection schemes for the documents. There are ... -
Performance analysis of JDO in J2EE architecture
(Dhirubhai Ambani Institute of Information and Communication Technology, 2005)Data persistence is one of the most important aspects of any enterprise wide application. An enterprise data persistence solution must provide speedy client transactions, ensure data integrity over time, and be able to ...