Browsing by Author "Chakka, Vijaykumar"

Now showing items 1-20 of 21

    • Acoustic source localization using audio and video sensors 

      Mouli, P. Chandra (Dhirubhai Ambani Institute of Information and Communication Technology, 2005)
      Problem of localizing an acoustic source using microphone array and video camera is studied. In general, it’s quite obvious that a human with both, eyes and ears can make out things more accurately than to a human who is ...

    • Application of compressive sensing to tow-way relay channel estimation 

      Nair, Rahit R. (Dhirubhai Ambani Institute of Information and Communication Technology, 2012)
      An Amplify and Forward Two-Way Relay Network is one where two nodes transmit data to each other via an intermediate relay. The relay amplifies the superimposed data from both the nodes before sending it to both the nodes. ...

    • Automation of model based estimation filters 

      Nimmagadda, Prathyusha (Dhirubhai Ambani Institute of Information and Communication Technology, 2006)
      Model based estimation filters are widely used in the field of estimation. They are applied for various types of dynamic and measurement models. There are different ways of solving these model based state estimation problems. ...

    • Broadband spectrum estimation using cascaded integrator comb filter 

      Panarwala, Riyazahmed A. (Dhirubhai Ambani Institute of Information and Communication Technology, 2010)
      Spectrum estimation using different type of lters is a broad area of research nowadays. In this work, Cascaded Integrator Comb (CIC) lter based narrowband spectrum estimation and CIC band pass lter is presented. Then the ...

    • Chaotic communication system for IEEE 802.11b (WLAN) 

      Thakar, Lalitkrushna Jagdishchandra (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 ...

    • Enhancing data efficiency in OFDM (IEEE 802.11a) using equalization (11A) 

      Reddy, S. Gangadhar (Dhirubhai Ambani Institute of Information and Communication Technology, 2005)
      IEEE 802.11a OFDM signal passed through a dispersive channel introduces ISI & ICI. To avoid ISI & ICI, cyclic prefix (guard interval) is introduced between the OFDM symbols. But the cyclic prefix contributes about 20% ...

    • Identifying the protein coding regions in DNA using IIR antinotch filter 

      Grandhi, Durga Ganesh (Dhirubhai Ambani Institute of Information and Communication Technology, 2007)
      Genomic Signal Processing is an emerging interdisciplinary area. The problem of Identifying Protein Coding Regions in DNA is addressed using signal processing techniques in this work. DNA can be thought of a string formed ...

    • Localization of target in wireless sensor networks 

      Sudhir, K. Venkata (Dhirubhai Ambani Institute of Information and Communication Technology, 2005)
      Advances in hardware and wireless network technology have made it possible to build and deploy dense ad-hoc wireless sensor networks of nodes collecting and disseminating information. One problem that arises in ad-hoc ...

    • Low complexity 2-level (FFT-GOERTZEL) spectrum sensing method for cognitive radio 

      Bhatt, Prakruti Vinodchandra (Dhirubhai Ambani Institute of Information and Communication Technology, 2012)
      Energy detection in frequency domain is a preferred technique for the spectrum sensing and the accuracy of frequency estimation depends on the Discrete Fourier Transform (DFT) size. Instead of computing full length (N) ...

    • Model based channel shortening technique for IEEE 802.11a OFDM system 

      Patidar, Pravin (Dhirubhai Ambani Institute of Information and Communication Technology, 2007)
      Channel shortening tehniques for IEEE802.11a OFDM system are studied. Their performance is evaluated for various standard channel models. A model based channel shortening technique is presented, which reduces the computational ...

    • Multiband cooperative spectrum sensing in cognitive radio networks 

      Pathak, Anusha (Dhirubhai Ambani Institute of Information and Communication Technology, 2013)
      Spectrum Sensing forms one of the most important functions of Cognitive Radio operation. Energy detection is a less complex spectrum sensing technique which does not need knowledge of Primary User (PU) signal. An Energy ...

    • Multirate signal processing in digital communications 

      Arya, Krishna Kumari (Dhirubhai Ambani Institute of Information and Communication Technology, 2008)
      Fundamentals of multirate signal processing and perfect reconstruction filter banks are revisited. An attempt is made to develop a good understanding of concepts by connecting the filter bank design issues to the concepts ...

    • Nonuniform sampling and its reconstruction methodologies 

      Bhawsar, Vishal (Dhirubhai Ambani Institute of Information and Communication Technology, 2008)
      Alias-free DSP (DASP) is a methodology of processing signals digitally inside bandwidth that are wider than the famous nyquist limit of half of the sampling frequency. This topic has benefited from a strong research revival ...

    • Oblique projection operator 

      Shivakrishana, D (Dhirubhai Ambani Institute of Information and Communication Technology, 2010)
      This thesis presents the understanding usefulness of Oblique Projector in signal processing like signal recovery, signal representation and reconstruction. This thesis also presents the different recursive oblique projector ...

    • Passive direction of arrival (DOA) tracking 

      Swarnkar, Hemant (Dhirubhai Ambani Institute of Information and Communication Technology, 2006)
      The work reported in this thesis is concerned with the Passive Direction Of Arrival (DOA) tracking problem. Traditionally model based approach is used to solve tracking problems. The measurements (DOA) are nonlinearly ...

    • Pulse shaping for linear time varying channels 

      Doshi, Savankumar (Dhirubhai Ambani Institute of Information and Communication Technology, 2011)
      Pulse shaping is the one of the important an critical area for wireless communication. In this article we show the relation between pulse shaping for wide sense stationary uncorrelated scattering (WSSUS) channels and the ...

    • Reconfigurable application specific instruction set processor for kalman filter (R-ASIK) 

      Dave, Kinjal (Dhirubhai Ambani Institute of Information and Communication Technology, 2006)
      Kalman filter is one of the most important signal processing algorithms used in many tracking applications. The main challenges for hardware implementation of Kalman filter include compute intensiveness O (n3) of the ...

    • Speech enhancement using microphone array for hands-free speech applications 

      Vichare, Chirag Vishwas (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 ...

    • State space based channel modelling 

      Nema, Swati (Dhirubhai Ambani Institute of Information and Communication Technology, 2010)
      xAbstract: An efficient channel estimation of single-input single output (SISO)/multiple-input multiple-output (MIMO) wireless channel is required for analysis, prediction, fault detection, channel equalization and ...

    • Symbol detection in MIMO systems 

      Dhaka, Kalpana (Dhirubhai Ambani Institute of Information and Communication Technology, 2008)
      Multiple input multiple output symbol detection methods are observed under frequency flat fading AWGN channel condition. The modulation method employed is Quadrature amplitude modulation (QAM). The various symbol detection ...