Indian Institute of Technology Delhi

Displaying 1-30 of 30 results

  • White Papers // Apr 2014

    Architectural Support for Handling Jitter in Shared Memory based Parallel Applications

    With an increasing number of cores per chip, it is becoming harder to guarantee optimal performance for parallel shared memory applications due to interference caused by kernel threads, interrupts, bus contention, and temperature management schemes (referred to as jitter). The authors demonstrate that the performance of parallel programs gets reduced...

    Provided By Indian Institute of Technology Delhi

  • White Papers // Feb 2014

    ParTejas: A Parallel Simulator for Multicore Processors

    In this paper, the authors present the design of a novel multicore simulator called ParTejas. It is a fast shared memory based parallel simulator written in Java. Unlike recently released parallel simulators that mainly rely on sampling, high level models, and highly relaxed synchronization, they primarily rely on novel concurrent...

    Provided By Indian Institute of Technology Delhi

  • White Papers // Jan 2014

    A Scheduling and Runtime Framework for a Cluster of Heterogeneous Machines With Multiple Accelerators

    The authors present a system that enables simple and intuitive programming of CPU+GPU clusters. This system relieves the programmer of the burden of load balancing, detailed data communication, task mapping, scheduling, etc. Their programming model is based on bulk synchronous distributed shared memory model, which is suitable for heterogeneous multi-GPU...

    Provided By Indian Institute of Technology Delhi

  • White Papers // Nov 2013

    EmuARM : A Tool for Teaching the ARM Assembly Language

    Technology has always enhanced learning as well as the overall teaching experience. With proper tools and resources in hand, the authors can easily integrate educational and information technologies into the academic environment. In this paper, they present a software tool to enhance the learning of microprocessors and computer architecture for...

    Provided By Indian Institute of Technology Delhi

  • White Papers // May 2012

    Full Diversity Decoding in Differential DF Cooperative System With Unitary Constellations

    The authors derive a Maximum Likelihood (ML) decoder in the differential Decode-and-Forward (DF) based cooperative communication system utilizing complex-valued unitary constellations like M-PSK. They also derive a low complexity Piecewise Linear (PL) decoder of the differential data transmitted in the DF based cooperative system. The proposed ML and PL decoders...

    Provided By Indian Institute of Technology Delhi

  • White Papers // Mar 2012

    Co-Operative Downlink Scheduling for Cell Edge and Handoff Users

    The authors present a new co-operative scheduling approach which provides not only more reliability but also higher effective capacity. Cooperation region is defined for active handoff users between two Base Stations (BSs) based on the user Quality-of-Service (QoS) requirements. A proper definition of co-operation or handoff region, where the user...

    Provided By Indian Institute of Technology Delhi

  • White Papers // Sep 2011

    Design and Implementation of the Work Flow of an Academic Cloud

    In this paper, the authors discuss the design and implementation of an academic cloud service, which they call Baadal. Tailored for academic and research requirements, Baadal bridges the gap between a private cloud and the requirements of an institution where request patterns and infrastructure are quite different from commercial settings....

    Provided By Indian Institute of Technology Delhi

  • White Papers // Aug 2011

    On Matching Latent to Latent Fingerprints

    This paper presents a forensics application of matching two latent fingerprints. In crime scene settings, it is often required to match multiple latent fingerprints. Unlike matching latent with inked or live fingerprints, this research problem is very challenging and requires proper analysis and attention. The contribution of this paper is...

    Provided By Indian Institute of Technology Delhi

  • White Papers // May 2011

    WHOP: Wormhole Attack Detection Protocol Using Hound Packet

    The lack of centralised infrastructure in ad hoc network makes it vulnerable to various attacks. MANET routing disrupts if participating node do not perform its intended function and start performing malicious activity. A specific attack called Wormhole attack enables an attacker to record packets at one location in the network,...

    Provided By Indian Institute of Technology Delhi

  • White Papers // Jan 2011

    Evaluation of a Routing Architecture for Wireless Messaging Ad-Hoc Networks

    The Short Messaging Service (SMS) which has become very popular in cellular networks is very highly priced. The authors show in this paper how self-organizing ad-hoc networks can be used to provide the short messaging service, at a much lower price. They propose a routing protocol for wireless messaging networks,...

    Provided By Indian Institute of Technology Delhi

  • White Papers // Dec 2010

    Impact of Interference on Nodal Communication Range in Wireless Ad Hoc Networks

    In a distributed control wireless ad hoc network, multi-user interference plays a significant role in determining one-to-one communication throughput performance of the network. Although the effects of exposed/hidden terminals on the network throughput in a single-channel wireless ad hoc network have been extensively studied, the interference power computation at the...

    Provided By Indian Institute of Technology Delhi

  • White Papers // Dec 2010

    A Novel Approach for Finding Optimal Number of Cluster Head in Wireless Sensor Network

    Prolonging life time is the most important designing objectives in Wireless Sensor Networks (WSN). In WSN the total amount of energy is limited, how to make best use of the limited resource energy is a very important aspect in research of WSN. In this paper, the authors provide a method...

    Provided By Indian Institute of Technology Delhi

  • White Papers // Dec 2010

    Cooperative Spectrum Sensing with an Improved Energy Detector in Cognitive Radio Network

    In this paper, performance of cooperative spectrum sensing with an improved energy detector is discussed. The Cognitive Radios (CRs) utilize an improved energy detector for taking a decision of the presence of the Primary User (PU). The improved energy detector uses an arbitrary positive power p of the amplitude of...

    Provided By Indian Institute of Technology Delhi

  • White Papers // Jul 2010

    Performance Analysis of an Improved Graded Precision Localization Algorithm for Wireless Sensor Networks

    In this paper an improved version of the graded precision localization algorithm GRADELOC, called IGRADELOC is proposed. The performance of GRADELOC is dependent on the regions formed by the overlapping radio ranges of the nodes of the underlying sensor network. A different region pattern could significantly alter the nature and...

    Provided By Indian Institute of Technology Delhi

  • White Papers // Jan 2010

    Hierarchical Neighbor Graphs: A Fully Distributed Topology for Data Collection in Wireless Sensor Networks

    The authors introduce hierarchical neighbor graphs, a new topology control mechanism for wireless sensor networks. This mechanism is a randomized one that takes a single parameter, 0 < p < 1, and uses it to build a structure that has the flavor of hierarchical clustering and is fully distributed in...

    Provided By Indian Institute of Technology Delhi

  • White Papers // Dec 2009

    Performance Analysis of a Multi-Relay Cooperative Diversity Network With Decode and Forward Relaying

    Consider a multi-relay cooperative diversity network consisting of a source, N relays, and a destination. For the transmission of a data symbol from the source to the destination, the relays cooperate with the source through the decode and forward protocol. All the links are statistically independent and undergo flat Rayleigh...

    Provided By Indian Institute of Technology Delhi

  • White Papers // Dec 2009

    Improved Array Processing for Two-User Detection of Alamouti Code

    Recently, it is shown in that by interference cancellation through zero-forcing a diversity order of 2(M - 1) can be achieved in a Multiple Access Channels (MAC) based uplink two-user MIMO system with two transmit antennas at each user and M > 2 receive antennas at the base-station. In this...

    Provided By Indian Institute of Technology Delhi

  • White Papers // Dec 2009

    Krylov Algorithms for FEXT Cancellation in Upstream MIMO VDSL

    In this paper, the authors show that Krylov subspace techniques are well suited for cancellation of Far End CROSSTalk (FEXT) in MIMO Digital Subscriber Lines (DSL). These methods are computationally efficient for large dimensional DSL channel by exploiting special characteristics of the channel without the need of channel inversion. In...

    Provided By Indian Institute of Technology Delhi

  • White Papers // Dec 2009

    Mitigation of Exposed Terminals Problem With Differential Capture Capable Receivers

    Recent experimental studies on physical layer capture in 802.11 based networks have demonstrated that the minimum signal-to-interference ratio required for successful reception of a frame depends upon the order of arrivals of the sender's frame and the interference, and it is much less when the sender's frame arrives earlier. This...

    Provided By Indian Institute of Technology Delhi

  • White Papers // Dec 2009

    Characterization of Aloha in Underwater Wireless Networks

    This paper provides an analytic framework of Aloha and Slotted Aloha (S-Aloha) performance in an underwater one-to-one communication environment with high and random inter-nodal signal propagation delay. The analysis shows that random inter-nodal propagation delay has no effect on the underwater Aloha performance. It also sheds light on the throughput...

    Provided By Indian Institute of Technology Delhi

  • White Papers // Dec 2009

    Generalised Pseudocirculants: Dual-Rate Systems, Cyclostationary Signals

    The well known pseudocirculant property is generalised in this paper. The generalised pseudocirculant property of the transfer matrix of a blocked linear dual-rate system is proved to be the necessary and sufficient condition for the system simplification. The authors prove that the power spectrum matrix of a blocked Wide Sense...

    Provided By Indian Institute of Technology Delhi

  • White Papers // Dec 2009

    Cyclostationary Signals in Multirate Linear Systems

    This paper presents a systematic approach to use Time Frequency Representation (TFR) for the analysis of cyclostationary signals in multirate linear systems. The authors exploit the ability of blocking operation to perform the analysis in a simple yet efficient manner. They illustrate the strength of TFR for performing such analysis....

    Provided By Indian Institute of Technology Delhi

  • White Papers // Oct 2009

    An Analytical Framework of Survivability Model for VoIP

    Nowadays Voice over Internet Protocol (VoIP) has become an evolutionary technology in telecommunications, and hence it is very important to study and enhance its survivability measures. In this paper, an analytical framework of survivability model for VoIP is proposed. The study is mainly focused on analyzing the combined effects of...

    Provided By Indian Institute of Technology Delhi

  • White Papers // Oct 2009

    Terrestrial Free Space LDPC Coded MIMO Optical Link

    In the present paper investigates study of a terrestrial, line-of-sight Free Space Optical (FSO) communication link using non-repetitive MIMO scheme with On OFF Keying (OOK) signal over turbulent propagation medium described by Gamma-Gamma PDF channel. Due to its underlying low complexity, VBLAST-ZF (Vertical Bell Labs Layered Space Time Zero Forcing)...

    Provided By Indian Institute of Technology Delhi

  • White Papers // Oct 2009

    Managing Multiligual OCR Project Using XML

    This paper presents a scheme based upon XML based labeling for managing a large multilingual OCR project. Managing a large multi-lingual OCR project involving multiple research groups, developing script specific and script independent technologies in a collaborative fashion is a challenging problem. This paper presents some of the software and...

    Provided By Indian Institute of Technology Delhi

  • White Papers // Jun 2009

    Effect of Atmospheric Turbulence on Acquisition Time of Ground to Deep Space Optical Communication System

    The performance of ground to deep space optical communication systems is degraded by distortion of the beam as it propagates through the turbulent atmosphere. Turbulence causes fluctuations in the intensity of the received signal which ultimately affects the acquisition time required to acquire and locate the space-borne target using narrow...

    Provided By Indian Institute of Technology Delhi

  • White Papers // May 2009

    Measurements in OLPC Mesh Networks

    The ease of deployment and the self configurable aspect of wireless mesh networks has generated lot of interest in them during the recent years. The One Laptop Per Child (OLPC) project uses mesh networking, closely adhering to IEEE 802.11s WLAN mesh standard, to provide networking in a classroom environment. The...

    Provided By Indian Institute of Technology Delhi

  • White Papers // Mar 2009

    REEF: A Reliable and Energy Efficient Framework for Wireless Sensor Networks

    This paper presents an efficient and scalable framework called Reliable and Energy Efficient Framework (REEF) for reliable data collection in Wireless Sensor Networks. REEF employs a distributed scheme which enables it to scale to large networks. It partitions the network in to clusters where the node with highest residual energy...

    Provided By Indian Institute of Technology Delhi

  • White Papers // Jan 2009

    Throughput Modeling of Multihop Radial Wireless Sensor Networks

    This paper presents an analytic model for throughput characterization in a single sink multi-hop wireless sensor network. The numerical results show that, for a given node density, due to multi-access contention and nodal buffer limit, the network attains a saturation throughput. As a result, maximum number of hops to the...

    Provided By Indian Institute of Technology Delhi

  • White Papers // Jan 2009

    The Effects of Node Cooperation Level on Routing Performance in Delay Tolerant Networks

    In this paper, the authors analyze the effect of different degrees of node cooperation on the performance of routing protocols for delay tolerant networks. They first present an accurate analytical characterization of the performance of epidemic and two-hops routing in terms of expected packet delivery rate under the standard assumption...

    Provided By Indian Institute of Technology Delhi

  • White Papers // Mar 2009

    REEF: A Reliable and Energy Efficient Framework for Wireless Sensor Networks

    This paper presents an efficient and scalable framework called Reliable and Energy Efficient Framework (REEF) for reliable data collection in Wireless Sensor Networks. REEF employs a distributed scheme which enables it to scale to large networks. It partitions the network in to clusters where the node with highest residual energy...

    Provided By Indian Institute of Technology Delhi

  • White Papers // Oct 2009

    Terrestrial Free Space LDPC Coded MIMO Optical Link

    In the present paper investigates study of a terrestrial, line-of-sight Free Space Optical (FSO) communication link using non-repetitive MIMO scheme with On OFF Keying (OOK) signal over turbulent propagation medium described by Gamma-Gamma PDF channel. Due to its underlying low complexity, VBLAST-ZF (Vertical Bell Labs Layered Space Time Zero Forcing)...

    Provided By Indian Institute of Technology Delhi

  • White Papers // Oct 2009

    An Analytical Framework of Survivability Model for VoIP

    Nowadays Voice over Internet Protocol (VoIP) has become an evolutionary technology in telecommunications, and hence it is very important to study and enhance its survivability measures. In this paper, an analytical framework of survivability model for VoIP is proposed. The study is mainly focused on analyzing the combined effects of...

    Provided By Indian Institute of Technology Delhi

  • White Papers // Oct 2009

    Managing Multiligual OCR Project Using XML

    This paper presents a scheme based upon XML based labeling for managing a large multilingual OCR project. Managing a large multi-lingual OCR project involving multiple research groups, developing script specific and script independent technologies in a collaborative fashion is a challenging problem. This paper presents some of the software and...

    Provided By Indian Institute of Technology Delhi

  • White Papers // Jul 2010

    Performance Analysis of an Improved Graded Precision Localization Algorithm for Wireless Sensor Networks

    In this paper an improved version of the graded precision localization algorithm GRADELOC, called IGRADELOC is proposed. The performance of GRADELOC is dependent on the regions formed by the overlapping radio ranges of the nodes of the underlying sensor network. A different region pattern could significantly alter the nature and...

    Provided By Indian Institute of Technology Delhi

  • White Papers // Jun 2009

    Effect of Atmospheric Turbulence on Acquisition Time of Ground to Deep Space Optical Communication System

    The performance of ground to deep space optical communication systems is degraded by distortion of the beam as it propagates through the turbulent atmosphere. Turbulence causes fluctuations in the intensity of the received signal which ultimately affects the acquisition time required to acquire and locate the space-borne target using narrow...

    Provided By Indian Institute of Technology Delhi

  • White Papers // Jan 2011

    Evaluation of a Routing Architecture for Wireless Messaging Ad-Hoc Networks

    The Short Messaging Service (SMS) which has become very popular in cellular networks is very highly priced. The authors show in this paper how self-organizing ad-hoc networks can be used to provide the short messaging service, at a much lower price. They propose a routing protocol for wireless messaging networks,...

    Provided By Indian Institute of Technology Delhi

  • White Papers // Jan 2009

    Throughput Modeling of Multihop Radial Wireless Sensor Networks

    This paper presents an analytic model for throughput characterization in a single sink multi-hop wireless sensor network. The numerical results show that, for a given node density, due to multi-access contention and nodal buffer limit, the network attains a saturation throughput. As a result, maximum number of hops to the...

    Provided By Indian Institute of Technology Delhi

  • White Papers // Dec 2009

    Characterization of Aloha in Underwater Wireless Networks

    This paper provides an analytic framework of Aloha and Slotted Aloha (S-Aloha) performance in an underwater one-to-one communication environment with high and random inter-nodal signal propagation delay. The analysis shows that random inter-nodal propagation delay has no effect on the underwater Aloha performance. It also sheds light on the throughput...

    Provided By Indian Institute of Technology Delhi

  • White Papers // Dec 2010

    A Novel Approach for Finding Optimal Number of Cluster Head in Wireless Sensor Network

    Prolonging life time is the most important designing objectives in Wireless Sensor Networks (WSN). In WSN the total amount of energy is limited, how to make best use of the limited resource energy is a very important aspect in research of WSN. In this paper, the authors provide a method...

    Provided By Indian Institute of Technology Delhi

  • White Papers // Jan 2010

    Hierarchical Neighbor Graphs: A Fully Distributed Topology for Data Collection in Wireless Sensor Networks

    The authors introduce hierarchical neighbor graphs, a new topology control mechanism for wireless sensor networks. This mechanism is a randomized one that takes a single parameter, 0 < p < 1, and uses it to build a structure that has the flavor of hierarchical clustering and is fully distributed in...

    Provided By Indian Institute of Technology Delhi

  • White Papers // Jan 2009

    The Effects of Node Cooperation Level on Routing Performance in Delay Tolerant Networks

    In this paper, the authors analyze the effect of different degrees of node cooperation on the performance of routing protocols for delay tolerant networks. They first present an accurate analytical characterization of the performance of epidemic and two-hops routing in terms of expected packet delivery rate under the standard assumption...

    Provided By Indian Institute of Technology Delhi

  • White Papers // May 2009

    Measurements in OLPC Mesh Networks

    The ease of deployment and the self configurable aspect of wireless mesh networks has generated lot of interest in them during the recent years. The One Laptop Per Child (OLPC) project uses mesh networking, closely adhering to IEEE 802.11s WLAN mesh standard, to provide networking in a classroom environment. The...

    Provided By Indian Institute of Technology Delhi

  • White Papers // Aug 2011

    On Matching Latent to Latent Fingerprints

    This paper presents a forensics application of matching two latent fingerprints. In crime scene settings, it is often required to match multiple latent fingerprints. Unlike matching latent with inked or live fingerprints, this research problem is very challenging and requires proper analysis and attention. The contribution of this paper is...

    Provided By Indian Institute of Technology Delhi

  • White Papers // Sep 2011

    Design and Implementation of the Work Flow of an Academic Cloud

    In this paper, the authors discuss the design and implementation of an academic cloud service, which they call Baadal. Tailored for academic and research requirements, Baadal bridges the gap between a private cloud and the requirements of an institution where request patterns and infrastructure are quite different from commercial settings....

    Provided By Indian Institute of Technology Delhi

  • White Papers // May 2011

    WHOP: Wormhole Attack Detection Protocol Using Hound Packet

    The lack of centralised infrastructure in ad hoc network makes it vulnerable to various attacks. MANET routing disrupts if participating node do not perform its intended function and start performing malicious activity. A specific attack called Wormhole attack enables an attacker to record packets at one location in the network,...

    Provided By Indian Institute of Technology Delhi

  • White Papers // May 2012

    Full Diversity Decoding in Differential DF Cooperative System With Unitary Constellations

    The authors derive a Maximum Likelihood (ML) decoder in the differential Decode-and-Forward (DF) based cooperative communication system utilizing complex-valued unitary constellations like M-PSK. They also derive a low complexity Piecewise Linear (PL) decoder of the differential data transmitted in the DF based cooperative system. The proposed ML and PL decoders...

    Provided By Indian Institute of Technology Delhi

  • White Papers // Mar 2012

    Co-Operative Downlink Scheduling for Cell Edge and Handoff Users

    The authors present a new co-operative scheduling approach which provides not only more reliability but also higher effective capacity. Cooperation region is defined for active handoff users between two Base Stations (BSs) based on the user Quality-of-Service (QoS) requirements. A proper definition of co-operation or handoff region, where the user...

    Provided By Indian Institute of Technology Delhi

  • White Papers // Dec 2010

    Impact of Interference on Nodal Communication Range in Wireless Ad Hoc Networks

    In a distributed control wireless ad hoc network, multi-user interference plays a significant role in determining one-to-one communication throughput performance of the network. Although the effects of exposed/hidden terminals on the network throughput in a single-channel wireless ad hoc network have been extensively studied, the interference power computation at the...

    Provided By Indian Institute of Technology Delhi

  • White Papers // Dec 2010

    Cooperative Spectrum Sensing with an Improved Energy Detector in Cognitive Radio Network

    In this paper, performance of cooperative spectrum sensing with an improved energy detector is discussed. The Cognitive Radios (CRs) utilize an improved energy detector for taking a decision of the presence of the Primary User (PU). The improved energy detector uses an arbitrary positive power p of the amplitude of...

    Provided By Indian Institute of Technology Delhi

  • White Papers // Dec 2009

    Krylov Algorithms for FEXT Cancellation in Upstream MIMO VDSL

    In this paper, the authors show that Krylov subspace techniques are well suited for cancellation of Far End CROSSTalk (FEXT) in MIMO Digital Subscriber Lines (DSL). These methods are computationally efficient for large dimensional DSL channel by exploiting special characteristics of the channel without the need of channel inversion. In...

    Provided By Indian Institute of Technology Delhi

  • White Papers // Dec 2009

    Performance Analysis of a Multi-Relay Cooperative Diversity Network With Decode and Forward Relaying

    Consider a multi-relay cooperative diversity network consisting of a source, N relays, and a destination. For the transmission of a data symbol from the source to the destination, the relays cooperate with the source through the decode and forward protocol. All the links are statistically independent and undergo flat Rayleigh...

    Provided By Indian Institute of Technology Delhi

  • White Papers // Dec 2009

    Improved Array Processing for Two-User Detection of Alamouti Code

    Recently, it is shown in that by interference cancellation through zero-forcing a diversity order of 2(M - 1) can be achieved in a Multiple Access Channels (MAC) based uplink two-user MIMO system with two transmit antennas at each user and M > 2 receive antennas at the base-station. In this...

    Provided By Indian Institute of Technology Delhi

  • White Papers // Dec 2009

    Generalised Pseudocirculants: Dual-Rate Systems, Cyclostationary Signals

    The well known pseudocirculant property is generalised in this paper. The generalised pseudocirculant property of the transfer matrix of a blocked linear dual-rate system is proved to be the necessary and sufficient condition for the system simplification. The authors prove that the power spectrum matrix of a blocked Wide Sense...

    Provided By Indian Institute of Technology Delhi

  • White Papers // Dec 2009

    Cyclostationary Signals in Multirate Linear Systems

    This paper presents a systematic approach to use Time Frequency Representation (TFR) for the analysis of cyclostationary signals in multirate linear systems. The authors exploit the ability of blocking operation to perform the analysis in a simple yet efficient manner. They illustrate the strength of TFR for performing such analysis....

    Provided By Indian Institute of Technology Delhi

  • White Papers // Dec 2009

    Mitigation of Exposed Terminals Problem With Differential Capture Capable Receivers

    Recent experimental studies on physical layer capture in 802.11 based networks have demonstrated that the minimum signal-to-interference ratio required for successful reception of a frame depends upon the order of arrivals of the sender's frame and the interference, and it is much less when the sender's frame arrives earlier. This...

    Provided By Indian Institute of Technology Delhi

  • White Papers // Apr 2014

    Architectural Support for Handling Jitter in Shared Memory based Parallel Applications

    With an increasing number of cores per chip, it is becoming harder to guarantee optimal performance for parallel shared memory applications due to interference caused by kernel threads, interrupts, bus contention, and temperature management schemes (referred to as jitter). The authors demonstrate that the performance of parallel programs gets reduced...

    Provided By Indian Institute of Technology Delhi

  • White Papers // Feb 2014

    ParTejas: A Parallel Simulator for Multicore Processors

    In this paper, the authors present the design of a novel multicore simulator called ParTejas. It is a fast shared memory based parallel simulator written in Java. Unlike recently released parallel simulators that mainly rely on sampling, high level models, and highly relaxed synchronization, they primarily rely on novel concurrent...

    Provided By Indian Institute of Technology Delhi

  • White Papers // Nov 2013

    EmuARM : A Tool for Teaching the ARM Assembly Language

    Technology has always enhanced learning as well as the overall teaching experience. With proper tools and resources in hand, the authors can easily integrate educational and information technologies into the academic environment. In this paper, they present a software tool to enhance the learning of microprocessors and computer architecture for...

    Provided By Indian Institute of Technology Delhi

  • White Papers // Jan 2014

    A Scheduling and Runtime Framework for a Cluster of Heterogeneous Machines With Multiple Accelerators

    The authors present a system that enables simple and intuitive programming of CPU+GPU clusters. This system relieves the programmer of the burden of load balancing, detailed data communication, task mapping, scheduling, etc. Their programming model is based on bulk synchronous distributed shared memory model, which is suitable for heterogeneous multi-GPU...

    Provided By Indian Institute of Technology Delhi