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Indian Institute of Science
(125 results)-
Whitepapers
Generation of a Short-Duration Ultrawideband Chirped-Pulse Using CRLH Transmission Lines
December 5, 2010, 12:00am PST
In this paper, the authors present the various design issues related to CRLH-Transmission lines for the generation of short duration Ultra-Wideband chirped-pulse. The major parameters of the CRLH...
Provided by Indian Institute of Science
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Electronically Tunable Zero Order Resonator Based On CRLH-TLs
December 9, 2010, 12:00am PST
Composite Right/Left Handed (CRLH) Transmission Line (TL) based electronically tunable 1.5 cell Zero Order Resonator (ZOR) is demonstrated with microstrip technology by use of varactors. A novel...
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Frequency Detection From Multiplexed Compressed Sensing of Noisy Signals
December 9, 2010, 12:00am PST
Signal acquisition under a compressed sensing scheme offers the possibility of acquisition and reconstruction of signals sparse on some basis incoherent with measurement kernel with sub-Nyquist...
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Cooperative Distributed Sequential Spectrum Sensing
December 8, 2010, 12:00am PST
The authors consider cooperative spectrum sensing for cognitive radios. They develop an energy efficient detector with low detection delay using sequential hypothesis testing. Sequential...
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Whitepapers
A Vertical Handoff Decision Scheme for End-to-End QoS in Heterogeneous Networks: An Implementation on a Mobile IP Testbed
December 8, 2010, 12:00am PST
A prominent function of a mobile host is seamless Vertical HandOff (VHO) that ensures application service continuity and quality. VHO decision algorithms that have been proposed in the paper...
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Interference Alignment as a Tool in Network Coding as Applied to Distributed Storage
December 24, 2009, 12:00am PST
In this paper, the authors outline an approach to the task of designing network codes in a non-multicast setting. Their approach makes use of the concept of interference alignment. As an example,...
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Explicit Codes Uniformly Reducing Repair Bandwidth in Distributed Storage
December 24, 2009, 12:00am PST
A distributed storage setting is considered where a file of size B is to be stored across n storage nodes. A data collector should be able to reconstruct the entire data by downloading the symbols...
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Whitepapers
Simulation Study of LDPC Codes for Nonuniform Sources With Side Information in Slepian-Wolf Coding
January 7, 2010, 12:00am PST
The principles of distributed source coding or Slepian-Wolf coding, primarily employed for compression of correlated sources with side information, can also be used for reducing the encoder...
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Whitepapers
No-Zero-Entry, Square, Single-Symbol ML Decodable STBCs
January 3, 2010, 12:00am PST
Space-time block codes based on Orthogonal Designs (ODs) are used for wireless communications with multiple transmit antennas which can achieve full transmit diversity along single-symbol...
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Whitepapers
On Approximately Universal Schemes for Two-Hop Network
December 24, 2009, 12:00am PST
Full-duplex and half-duplex two-hop networks are considered. Explicit coding schemes which are approximately universal over a class of fading distributions are identified, for the case when the...
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Low-Complexity, Information Lossless STBCs for Two-User MISO-MAC With Partial CSIT
December 31, 2009, 12:00am PST
In this paper, Space-Time Block Codes (STBCs) with low Maximum-Likelihood (ML) decoding complexity and information-losslessness property are proposed for a two-user Multiple-Input Single-Output,...
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Opportunistic Splitting for Scheduling Via Stochastic Approximation
January 15, 2010, 12:00am PST
The authors consider the problem of scheduling a wireless channel among multiple users. A slot is given to a user with a highest metric (e.g., channel gain) in that slot. The scheduler may not...
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A Double U-Slot Patch Antenna With Dual Wideband Characteristics
December 30, 2009, 12:00am PST
Microstrip patch antennas are strong candidates for use in many wireless communications applications. This paper proposes the use of a patch antenna with two U-shaped slots to achieve dual band...
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Whitepapers
Neighbor Oblivious Link Reversal Over Duty-Cycled WSNs
January 15, 2010, 12:00am PST
The authors propose partial and full link reversal algorithms to bypass voids during geographic routing over duty-cycled wireless sensor networks. They propose a distributed approach that is...
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On Addressing Efficiency Concerns in Privacy Preserving Data Mining
February 1, 2008, 12:00am PST
Data mining services require accurate input data for their results to be meaningful, but privacy concerns may influence users to provide spurious information. To encourage users to provide correct...
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Throughput Analysis of Primary and Secondary Networks in a Shared IEEE 802.11 System
December 6, 2012, 12:00am PST
In this paper, the authors analyze the coexistence of a primary and a secondary (cognitive) network when both networks use the IEEE 802.11 based distributed coordination function for medium access...
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Adaptive Scheduling in Real-Time Systems Through Period Adjustment
December 14, 2012, 12:00am PST
Real-time system technology traditionally developed for safety critical systems, has now been extended to support multimedia systems and virtual reality. A large number of real-time application,...
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Distributed Co-Phasing for Binary Consensus in Wireless Sensor Networks
December 19, 2012, 12:00am PST
The authors address the problem of binary consensus over noisy, fading channels. They propose a new transmission model using Distributed Co-phasing that ensures the system to reach accurate...
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Perormance Analysis of a Node Monitoring Protocol in Ubiquitous Networks
March 14, 2013, 12:00am PDT
The proliferation of the ubiquitous applications in different sphere of life like ubiquitous health monitoring system, and ubiquitous learning system demands the network monitoring, to check...
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Information Capacity of an Energy Harvesting Sensor Node
December 13, 2012, 12:00am PST
Energy harvesting sensor nodes are gaining popularity due to their ability to improve the network life time and are becoming a preferred choice supporting "Green Communication". In this paper, the...
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Whitepapers
On Secrecy Above Secrecy Capacity
March 21, 2012, 12:00am PDT
Information theoretic security is being widely studied in recent times. It provides fundamental limits of secret communication. Unlike in cryptography, the information theoretic techniques are not...
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Whitepapers
Modelling and Analysis of New Coolstreaming for P2P IPTV
September 28, 2012, 12:00am PDT
Peer to peer networks are being used extensively nowadays for file sharing, video on demand and live streaming. For IPTV, delay deadlines are more stringent compared to file sharing....
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Achievable Secrecy Sum-Rate in a Fading MAC-WT with Power Control and without CSI of Eavesdropper
October 17, 2011, 12:00am PDT
The authors consider a two user fading Multiple Access Channel with a Wire-Tapper (MAC-WT) where the transmitter has the Channel State Information (CSI) to the intended receiver but not to the...
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Capacity of a Gaussian MAC with Energy Harvesting Transmit Nodes
April 10, 2012, 12:00am PDT
The authors consider a Gaussian Multiple Access Channel (GMAC) where the users are sensor nodes powered by energy harvesters. The energy harvesters may have finite or infinite buffer to store the...
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Diversity Order vs Rate in an AWGN Channel
October 5, 2011, 12:00am PDT
The authors study the diversity order vs. rate of an Additive White Gaussian noise (AWGN) channel in the whole capacity region. They show that for discrete input as well as for continuous input,...
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Joint Source-Channel Coding Over a Fading Multiple Access Channel with Partial Channel State Information
July 23, 2009, 12:00am PDT
In this paper, the authors address the problem of transmission of correlated sources over a fast fading Multiple Access Channel (MAC) with partial channel state information available at both the...
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Distributed Joint Source- Channel Coding for Functions Over a Multiple Access Channel
July 23, 2009, 12:00am PDT
Sensor networks are used in a wide variety of applications due to their ability to operate in environments where human penetration is not possible. One killer application of such networks is...
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Distributed Transmission of Functions of Correlated Sources Over a Fading Multiple Access Channel
September 24, 2009, 12:00am PDT
In this paper, the authors address the problem of distributed transmission of functions of correlated sources over a fast fading Multiple Access Channel (MAC). This is a basic building block in a...
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Whitepapers
Wireless Network-Coded Multi-Way Relaying Using Latin Hyper-Cubes
March 1, 2013, 12:00am PST
The two-stage protocol for physical layer network coding for the two-way relay channel first introduced in 2006, exploits the multiple access interference occurring at the relay so that the...
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Whitepapers
Measurement Based Impromptu Deployment of a Multi-Hop Wireless Relay Network
March 11, 2013, 12:00am PDT
The authors study the problem of optimal sequential ("As-you-go") deployment of wireless relay nodes, as a person walks along a line of random length (with a known distribution). The objective is...
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Improved IDS Using Layered CRFS With Logon Restrictions and Mobile Alerts Based on Deviant System Behaviour
March 1, 2013, 12:00am PST
With the ever increasing number and diverse type of attacks, including new and previously unseen attacks, the effectiveness of an intrusion detection system is very important. Hence there is high...
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Whitepapers
Relay Selection With Channel Probing for Geographical Forwarding in WSNs
April 10, 2012, 12:00am PDT
In a large Wireless Sensor Network (WSN) with sleep-wake cycling nodes, the authors are interested in the local decision problem faced by a node that has "Custody" of a packet and has to choose...
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CUSUM Based Distributed Detection in WSNs
April 15, 2008, 12:00am PDT
The authors are concerned with the situation in which a wireless sensor network is deployed in a region, for the purpose of detecting an event occurring at a random time and at a random location....
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Theory and Algorithms for Hop-Count-Based Localization With Random Geometric Graph Models of Dense Sensor Networks
June 3, 2011, 12:00am PDT
The authors consider a network in which several service providers offer wireless access to their respective subscribed customers through potentially multi-hop routes. If providers cooperate by...
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Delay Optimal Schedule for a 2-Hop Vehicular Relay Network
January 1, 2011, 12:00am PST
The authors study a scheduling problem in a mobile network scenario where vehicles are used as relays. A fixed source node wants to transfer a file of a known size to a fixed destination node,...
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Time and Energy Complexity of Distributed Computation of a Class of Functions in Wireless Sensor Networks
October 13, 2007, 12:00am PDT
The authors consider a scenario in which a wireless sensor network is formed by randomly deploying n sensors to measure some spatial function over a field, with the objective of computing a...
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Design of a TDD Multisector TDM MAC for the WiFiRe Proposal for Rural Broadband Access
June 27, 2007, 12:00am PDT
The WiFiRe (WiFi Rural Extension) proposal for rural broadband access is being developed under the aegis of CEWIT. The system leverages the widely available, and highly cost-reduced, WiFi...
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Analytical Model for an IEEE 802.11 WLAN Using DCF With Two Types of VoIP Calls
January 1, 2011, 12:00am PST
The authors formulate an analytical model for capacity evaluation of an infrastructure IEEE 802.11 based network carrying full-duplex packet telephone calls when different types of codecs are used...
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Robust THP Transceiver Designs for Multiuser MIMO Downlink With Imperfect CSIT
July 17, 2009, 12:00am PDT
The authors present robust joint nonlinear transceiver designs for multiuser Multiple-Input Multiple-Output (MIMO) downlink in the presence of imperfections in the Channel State Information at the...
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Interference Mitigation in Cooperative SFBC-OFDM
March 28, 2008, 12:00am PDT
The authors consider cooperative Space-Frequency Block-Coded OFDM (SFBC-OFDM) networks with Amplify-and-Forward (AF) and Decode-and-Forward (DF) protocols at the relays. In cooperative SFBC-OFDM...
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Whitepapers
Diversity-Rate Trade-Off for Fading Channels With Power Control
May 24, 2012, 12:00am PDT
The authors consider a complex, additive, white Gaussian noise channel with flat fading. They study its diversity order vs transmission rate for some known power allocation schemes. The capacity...
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A Novel Association Policy for Web Browsing in a Multirate WLAN
August 13, 2010, 12:00am PDT
The authors obtain an association policy for STAs in an IEEE 802.11 WLAN by taking into account explicitly two aspects of practical importance: TCP-controlled short file downloads interspersed...
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Secure Compute-and-Forward in a Bidirectional Relay
June 26, 2012, 12:00am PDT
Bidirectional relaying, where a relay helps two user nodes to exchange messages has been an active area of recent research. In the compute-and-forward strategy for bidirectional relaying, the...
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Computer Processing of Electroencephalographic Signals for Functional Connectivity Analysis of the Brain Using Graph Theoretic Techniques
November 29, 2011, 12:00am PST
Computer processing of biomedical signals have gained a lot of importance because its extensive applications in healthcare. Extensive studies have been made on various aspects of bioengineering...
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Optimal Allocation of Rates in Guaranteed Service Networks
October 6, 2011, 12:00am PDT
The authors examine the problem of rate allocation in Guaranteed Services networks by assigning a cost corresponding to a rate, and examining least cost allocations. They show that the common...
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LoadIQ: Learning to Identify Workload Phases From a Live Storage Trace
May 7, 2012, 12:00am PDT
Storage infrastructure in large-scale cloud data center environments must support applications with diverse, time-varying data access patterns while observing the quality of service. Deeper...
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A Novel MCMC Algorithm for Near-Optimal Detection in Large-Scale Uplink Mulituser MIMO Systems
April 10, 2012, 12:00am PDT
In this paper, the authors propose a low-complexity algorithm based on Markov Chain Monte Carlo (MCMC) technique for signal detection on the uplink in large scale multiuser Multiple Input Multiple...
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Performance Analysis of Deterministic Key Allocation Schemes for Wireless Sensor Networks
March 15, 2012, 12:00am PDT
Because of the resource-constrained nature of Wireless Sensor Networks (WSNs), it is easier to use a security system based on symmetric key cryptography. However, the distribution and management...
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State Dependent Attempt Rate Modeling of Single Cell IEEE 802.11 WLANs With Homogeneous Nodes and Poisson Arrivals
January 1, 2012, 12:00am PST
Analytical models of IEEE 802.11-based WLANs are invariably based on approximations, such as the well-known mean-field approximations proposed by Bianchi for saturated nodes. In this paper, the...
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Delay and Energy Optimal Two-Hop Relaying in Delay Tolerant Networks
July 20, 2010, 12:00am PDT
The authors study the trade-off between delivery delay and energy consumption in delay tolerant mobile wireless networks that use two-hop relaying. The source may not have perfect knowledge of the...
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Delay Constrained Optimal Relay Placement for Planned Wireless Sensor Networks
August 4, 2010, 12:00am PDT
In this paper, the authors study the problem of wireless sensor network design by deploying a minimum number of additional relay nodes (to minimize network design cost) at a subset of given...
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Information Dissemination in Socially Aware Networks Under the Linear Threshold Model
December 7, 2010, 12:00am PST
The authors provide new analytical results concerning the spread of information or influence under the linear threshold social network model introduced by Kempe et al. in, in the information...
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Optimal Deployment of Impromptu Wireless Sensor Networks
December 31, 2011, 12:00am PST
The need for impromptu wireless networks arises in emergency situations where the team responding to the emergency, needs to deploy sensors (such as motion sensors, or even imaging sensors) and a...
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Wireless Bidirectional Relaying and Latin Squares
November 16, 2011, 12:00am PST
The design of modulation schemes for the physical layer network-coded two way relaying scenario is considered with the protocol which employs two phases: Multiple Access (MA) Phase and BroadCast...
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QoS Aware and Survivable Network Design for Planned Wireless Sensor Networks
December 1, 2011, 12:00am PST
The authors study the problem of wireless sensor network design by deploying a minimum number of additional relay nodes (to minimize network cost) at a subset of given potential relay locations,...
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Energy Aware Node Selection for Cluster-Based Data Accuracy Estimation in Wireless Sensor Networks
November 16, 2011, 12:00am PST
Recent improvements in wireless communication have made a drastic development over wireless sensor networks and wireless embedded systems. Because of the reliable cost, ease of development, small...
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Wireless Network-Coded Three-Way Relaying Using Latin Cubes
March 29, 2012, 12:00am PDT
The design of modulation schemes for the physical layer network-coded three-way wireless relaying scenario is considered. The protocol employs two phases: Multiple Access (MA) phase and BroadCast...
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Wireless Network-Coded Accumulate-Compute and Forward Two-Way Relaying
January 4, 2012, 12:00am PST
The design of modulation schemes for the physical layer network-coded two way wireless relaying scenario is considered. It was observed by Koike-Akino et al. for the two way relaying scenario,...
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Wireless Network Coding for MIMO Two-Way Relaying Using Latin Rectangles
March 14, 2012, 12:00am PDT
The authors consider the two-way wireless relaying scenario shown with multiple antennas at the nodes, where data transfer takes place between the nodes A and B with the help of the relay R. It is...
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Optimal Node Selection Using Estimated Data Accuracy Model in Wireless Sensor Networks
March 9, 2012, 12:00am PST
One of the major task of wireless sensor network is to sense accurate data from the physical environment. Hence in this paper, the authors develop an estimated data accuracy model for randomly...
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Performance Analysis of Adaptive Physical Layer Network Coding for Wireless Two-Way Relaying
March 26, 2012, 12:00am PDT
The analysis of modulation schemes for the physical layer network-coded two way relaying scenario is presented which employs two phases: Multiple access (MA) phase and BroadCast (BC) phase. It was...
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Progressive Prediction of Turbulence Using Wave- Front Sensor Data in Adaptive Optics Using Data Mining
June 19, 2010, 12:00am PDT
Nullifying the servo bandwidth errors improves the strehl ratio by a substantial quantity in adaptive optics systems. An effective method for predicting atmospheric turbulence to reduce servo...
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Automatic Distributed-Memory Parallelization and Code Generation Using the Polyhedral Framework
September 1, 2011, 12:00am PDT
Automatic parallelization is a hard problem. Even in domains where it has been successful, parallelization for distributed-memory parallel architectures is considered very complex, and addressing...
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Reliability Modelling of Disk Subsystems With Probabilistic Model Checking
September 1, 2011, 12:00am PDT
The authors discuss how probabilistic model checking, a variant of model checking, can be useful in modelling multiple failures in disk subsystems, as it allows specification of probabilities or...
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White Papers
MMSE Receiver for Multiuser Interference Cancellation in Uplink OFDMA
November 27, 2008, 12:00am PST
In uplink Orthogonal Frequency Division Multiple Access (OFDMA) systems, MultiUser Interference (MUI) occurs due to different Carrier Frequency Offsets (CFO) of different users at the receiver. In...
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Robust MMSE Tomlinson-Harashima Precoder for Multiuser MISO Downlink With Imperfect CSI
January 1, 2011, 12:00am PST
Non-linear precoding for the downlink of a multiuser MISO (Multiple-Input Single-Output) communication system in the presence of imperfect Channel State Information (CSI) is considered. The base...
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Improved Large-MIMO Detection Based on Damped Belief Propagation
June 30, 2010, 12:00am PDT
In this paper, the authors consider the application of Belief Propagation (BP) to achieve near-optimal signal detection in large Multiple-Input Multiple-Output (MIMO) systems at low complexities....
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Receive Antenna Selection With Imperfect Channel Knowledge From Training
January 18, 2009, 12:00am PST
Receive Antenna Selection (AS), in which a subset of a receiver's antennas is selected based on the instantaneous channel condition, enables the receiver to benefit from having multiple antenna...
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Fast Distributed Multiple Access Based Selection With Imperfect Parameter Knowledge
December 20, 2008, 12:00am PST
Several wireless systems that seek to exploit multiuser or spatial diversity need to opportunistically select a 'Best' node from among the many available nodes. This is done on the basis of a...
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A Practical Dirty Paper Coding Applicable for Broadcast Channel
January 18, 2010, 12:00am PST
The authors have presented a novel dirty paper coding scheme which followed Costa's paper analytically and allowed the recoverability of the dirt. Their scheme implemented random binning in a...
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On the Design of Location-Invariant Sensing Performance for Secondary Users
August 21, 2009, 12:00am PDT
In this paper, the authors consider the setting of one-shot spectrum hole detection for a uniformly distributed secondary network under fading and path loss. They separate the sensors that are...
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Lossy Distributed Source Coding With Side Information
January 1, 2011, 12:00am PST
In a typical sensor network scenario a goal is to monitor a spatio-temporal process through a number of inexpensive sensing nodes, the key parameter being the fidelity at which the process has to...
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Source-Channel Coding for Gaussian Sources Over a Gaussian Multiple Access Channel
September 27, 2007, 12:00am PDT
The authors consider the problem of distributed joint source-channel coding of correlated Gaussian sources over a Gaussian Multiple Access Channel (MAC). There may be side information at the...
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Computing TCP Throughput in a UMTS Network
January 4, 2008, 12:00am PST
The authors compute the throughput obtained by a TCP connection in a UMTS environment. For downloading data at a mobile terminal, the packets of each TCP connection are stored in separate queues...
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An Efficient Algorithm for Cooperative Spectrum Sensing in Cognitive Radio Networks
August 3, 2008, 12:00am PDT
The authors consider the problem of Spectrum Sensing in Cognitive Radio Systems. They have developed a distributed algorithm that the Secondary users can run to sense the channel cooperatively. It...
Provided by Indian Institute of Science
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White Papers
Co-Evolution of Content Popularity and Delivery in Mobile P2P Networks
July 29, 2011, 12:00am PDT
Mobile P2P technology provides a scalable approach to content delivery to a large number of users on their mobile devices. In this paper, the authors study the dissemination of a single content...
Provided by Indian Institute of Science
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Joint Routing, Scheduling and Power Control For Multihop Wireless Networks With Multiple Antennas
October 3, 2011, 12:00am PDT
The authors consider the problem of Joint Routing, Scheduling and Power-control (JRSP) problem for Multi-Hop Wireless Networks (MHWN) with multiple antennas. They extend the problem and a...
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Data Accuracy Model for Distributed Clustering Algorithm Based on Spatial Data Correlation in Wireless Sensor Networks
August 12, 2011, 12:00am PDT
The main objective of this paper is to construct a distributed clustering algorithm based upon spatial data correlation among sensor nodes and perform data accuracy for each distributed cluster at...
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Data Accuracy Estimation for Spatially Correlated Data in Wireless Sensor Networks Under Distributed Clustering
December 25, 2010, 12:00am PST
The main purpose of this paper is to construct a distributed clustering algorithm such that each distributed cluster can perform the data accuracy at their respective cluster head node before data...
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White Papers
Quality of Service for I/O Workloads in Multicore Virtualized Servers
October 13, 2011, 12:00am PDT
Emerging trend of multi-core servers promises to be the panacea for all data-center issues with system virtualization as the enabling technology. System virtualization allows one to create virtual...
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