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Institute of Electrical & Electronic Engineers
(11422 results)-
Whitepapers
Optimization of Linear Recursive Queries in SQL
January 1, 2012, 12:00am PST
Recursion is a fundamental computation mechanism which has been incorporated into SQL. This work focuses on the optimization of linear recursive queries in SQL. Query optimization is studied with...
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Whitepapers
Statistical Model Computation With UDFs
January 1, 2012, 12:00am PST
Statistical models are generally computed outside a DBMS due to their mathematical complexity. The authors introduce techniques to efficiently compute fundamental statistical models inside a DBMS...
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Integrating K-Means Clustering With a Relational DBMS Using SQL
January 1, 2012, 12:00am PST
Integrating data mining algorithms with a relational DBMS is an important problem for database programmers. The authors introduce three SQL implementations of the popular K-means clustering...
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Whitepapers
Spatio-Temporal Joins on Symbolic Indoor Tracking Data
March 16, 2011, 12:00am PDT
To facilitate a variety of applications, positioning systems are deployed in indoor settings. For example, Bluetooth and RFID positioning are deployed in airports to support real-time monitoring...
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Whitepapers
Graph Model Based Indoor Tracking
August 1, 2009, 12:00am PDT
The tracking of the locations of moving objects in large indoor spaces is important, as it enables a range of applications related to, e.g., security and indoor navigation and guidance. This paper...
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Whitepapers
BER Analysis of OFDM Systems Impaired by Phase Noise in Frequency-Selective Rayleigh Fading Channels
October 29, 2008, 12:00am PDT
In this paper, the authors study the effect of finite-power, Phase-Locked-Loop (PLL) based phase noise on the Bit-Error-Rate (BER) of Orthogonal Frequency Division Multiplexing (OFDM) systems in...
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Whitepapers
Maximum Likelihood Estimation and Correction of Carrier Frequency Offset in OFCDM Systems
October 29, 2008, 12:00am PDT
In this paper, a Carrier Frequency Offset (CFO) correction scheme is proposed for a downlink Variable Spreading Factor (VSF) OFCDM system based on the maximum likelihood principle. The authors...
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Whitepapers
A Blind Maximum-SINR Synchronization Technique for OFDM Systems
October 29, 2008, 12:00am PDT
This paper presents a blind synchronizer for Orthogonal Frequency-Division Multiplexing (OFDM) systems based on Signal-to-Interference-and-Noise-Ratio (SINR) maximization. Due to the incurred...
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Whitepapers
Doppler Spread Estimation by Subspace Tracking for OFDM Systems
October 29, 2008, 12:00am PDT
In this paper, a novel maximum Doppler spread estimation algorithm is presented for OFDM systems with the comb-type pilot pattern. The least squared estimated Channel Frequency Responses (CFR's)...
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Whitepapers
Design and Analysis of Channel Estimation for Multi-Band OFDM-UWB Systems
October 29, 2008, 12:00am PDT
This paper presents an efficient channel estimation scheme for multi-band orthogonal frequency division multiplexing based ultra-wideband communications. The scheme is based on a simple...
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Whitepapers
Spectral Sculpting for OFDM Based Opportunistic Spectrum Access by Extended Active Interference Cancellation
October 29, 2008, 12:00am PDT
To enable coexistence between an OFDM based opportunistic spectrum access system and a primary user, the authors proposed two novel methods called EAIC (Extended Active Interference Cancellation)...
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Whitepapers
Performance Enhancement of Random Unitary Beamforming Based Multiuser MIMO Systems With Optimum Combining
October 29, 2008, 12:00am PDT
Random Unitary Beamforming (RUB) is an attractive low-complexity transmission scheme for multiuser MIMO broadcast channel. When there are a moderate number of users in the system, the sum rate...
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Whitepapers
MIMO Multichannel Beamforming: Analysis in the Presence of Rayleigh Fading, Unbalanced Interference and Noise
October 29, 2008, 12:00am PDT
This paper studies the performance of MIMO multichannel beamforming systems in the presence of unequal-power co-channel interference and noise. The authors present exact expressions for the symbol...
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Whitepapers
MIMO Multiple Access Channels With Noisy Channel Estimation and Partial CSI Feedback
October 29, 2008, 12:00am PDT
The authors consider correlated MIMO multiple access channels with block fading, where each block is divided into training and data transmission phases. They find the channel estimation and data...
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Whitepapers
Thresholded Interference Cancellation Algorithm for the LTE Uplink Multiuser MIMO
October 29, 2008, 12:00am PDT
Single Carrier Frequency Division Multiple Access (SC-FDMA) is adopted as uplink multiple access scheme in 3G Long-Term Evolution (LTE). Combining SC-FDMA with MIMO (Multiple-Input...
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Whitepapers
Ergodic Capacity of Multi-Hop Wireless Relaying Systems in Rayleigh Fading
October 29, 2008, 12:00am PDT
The ergodic capacity in Rayleigh fading of multi-hop wireless transmission systems employing either amplify-and-forward relaying or decode-and-forward relaying is studied, assuming channel state...
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Whitepapers
Level-Crossing Rate and Average Duration of Fades of the Envelope of Mobile-to-Mobile Fading Channels in Cooperative Networks Under Line-of-Sight Conditions
October 29, 2008, 12:00am PDT
This paper studies the fading behavior of Mobile-To-Mobile (M2M) fading channels in relay-based cooperative networks under Line-Of-Sight (LOS) conditions. Here, the authors assume that LOS...
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Whitepapers
Power Allocation for Cognitive Radios Based on Primary User Activity in an OFDM System
October 29, 2008, 12:00am PDT
Efficient and reliable power allocation algorithm in Cognitive Radio (CR) networks is a challenging problem. Traditional water-filling algorithm is inefficient for CR networks due to the...
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Whitepapers
Resource Sharing in Cognitive Radio Systems: Outage Capacity and Power Allocation Under Soft Sensing
October 29, 2008, 12:00am PDT
Cognitive radio technology offers tremendous potential to improve the utilization of the radio spectrum by efficiently reusing and sharing the licensed spectrum bands, as long as the interference...
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Whitepapers
Game Theoretic Approach to Spectrum Allocation for Weak Interference Systems
October 29, 2008, 12:00am PDT
A scenario consisting of two transmitter-receiver pairs coexisting in the same area and communicating using the same portion of the spectrum is considered. Decentralized coding strategies are...
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Whitepapers
Cooperative and Non-Cooperative Aloha Games With Channel Capture
October 29, 2008, 12:00am PDT
Game theory has been a useful tool for the analysis of random-access based wireless networks due to their decentralized operations. This paper studies one of the most widely used random access...
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Whitepapers
Weighted Sum Rate Optimization of Multicell Cognitive Radio Networks
October 29, 2008, 12:00am PDT
In this paper, the authors study the weighted sum rate maximization of multicell cellular Cognitive Radio Networks (CRNs) which are overlaid with multicell Primary Radio Networks (PRNs). They...
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Whitepapers
Efficient Ergodic Discrete Loading for OFDM Systems
October 29, 2008, 12:00am PDT
The authors consider the discrete bit loading problem in OFDM systems with objective and constraints in terms of ergodic rates and powers. This differs from almost all existing techniques, which...
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Whitepapers
Joint Power Loading of Data and Pilots in OFDM Using Imperfect Channel State Information at the Transmitter
October 29, 2008, 12:00am PDT
The search for optimality in the design of channel precoders and training symbols in block processing communication systems is one of paramount importance. Finding the best tradeoff in terms of...
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Whitepapers
Novel Low-Complexity SLM Schemes for PAPR Reduction in OFDM Systems
October 29, 2008, 12:00am PDT
The SeLected Mapping (SLM) is a major scheme for Peak-to-Average Power Ratio (PAPR) reduction in Orthogonal Frequency Division Multiplexing (OFDM) systems. It has been shown that the complexity of...
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Whitepapers
BER Analysis for Asymmetric OFDM Systems
October 29, 2008, 12:00am PDT
To alleviate the high Peak-to-Average Power Ratio (PAPR) and sensitivity to Carrier Frequency Offset (CFO) problems, an Asymmetric OFDM (A-OFDM) system has been recently proposed. In this paper,...
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Whitepapers
Performance of BICM-OFDM Systems in Non-Gaussian Noise and Interference
October 29, 2008, 12:00am PDT
In this paper, the authors present a general mathematical framework for performance analysis of systems employing Bit - Interleaved Coded Modulation (BICM) and Orthogonal Frequency Division...
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Whitepapers
Capacity Analysis for OFDM Systems With Transceiver I/Q Imbalance
October 29, 2008, 12:00am PDT
OFDM systems have gained utmost importance for wireless communications requiring ever higher data rates. The maximum data rate that can be achieved is, however, limited by the wireless...
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Whitepapers
The Impact of Imperfect Channel State Information on QRD-Based Precoded MIMO-OFDM System
October 29, 2008, 12:00am PDT
A new closed-loop precoding method has been proposed for MIMO-OFDM systems with limited feedback by using the QR decomposition to the time-domain channel impulse response matrix. In contrast to...
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Whitepapers
A Supervised Learning Approach to Adaptation in Practical MIMO-OFDM Wireless Systems
October 29, 2008, 12:00am PDT
MIMO-OFDM wireless systems require adaptive modulation and coding based on Channel State Information (CSI) to maximize throughput in changing wireless channels. Traditional adaptive modulation and...
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Whitepapers
3G LTE Simulations Using Measured MIMO Channels
October 29, 2008, 12:00am PDT
In this paper, the authors present downlink simulation results for a realistic implementation of the LTE (Long Term Evolution) 3G standard. In contrast to previous studies, actual measured...
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Whitepapers
Throughput/Delay Measurements of Limited Feedback Beamforming in Indoor Wireless Networks
October 29, 2008, 12:00am PDT
This paper investigates the tradeoff between throughput and feedback delay of limited feedback beamforming in indoor wireless channels with a practical MIMO-OFDM prototype. Past descriptions of...
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Whitepapers
Effect of Channel Estimation Errors in MIMO-OFDM Systems With Phase Noise Compensation
October 29, 2008, 12:00am PDT
In this paper, the effect of phase noise in multiple-input-multiple-output systems employing orthogonal frequency division multiplexing is considered in a realistic scenario where channel...
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Whitepapers
Location-Aware Cooperative Communications Utilizing Linear Network Coding
October 29, 2008, 12:00am PDT
Cooperative communication can be used to reduce the transmit power of distant mobile units, compared to conventional direct transmission, given the same quality-of-service. However, imposing the...
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Whitepapers
Novel Rateless Coded Selection Cooperation in Dual-Hop Relaying Systems
October 29, 2008, 12:00am PDT
Selection cooperation is proposed for rateless coded relaying by developing a novel low-complexity protocol that exploits all source-destination, source-relay, and relay-destination link qualities...
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Whitepapers
Enhanced Bidirectional Relaying Schemes for Multi-Hop Communications
October 29, 2008, 12:00am PDT
This paper focuses on bidirectional relaying schemes for multi-hop communications. For a two hop communication system, Traditional 4-step Bidirectional Relaying (TBR) method allocates 4 slots,...
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Whitepapers
A Two-Dimensional Markov Model for Cross-Layer Design in AMC/ARQ-Based Wireless Networks
October 29, 2008, 12:00am PDT
Now-a-days, there are lots of research efforts focusing on cross-layer designs combining Adaptive Modulation and Coding (AMC) with an Automatic Repeat reQuest (ARQ) protocol. One of the main...
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Whitepapers
Joint Methods of Cell Searching and DoA Estimation for a Mobile Relay Station With Multiple Antennas
October 29, 2008, 12:00am PDT
In this paper, a Mobile Relay Station (MRS) for vehicles with beamforming antennas is considered to increase the reliability of transmission link, especially for the MRS at cell boundary. Joint...
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Whitepapers
Energy Efficient Estimation of Gaussian Sources Over Inhomogeneous Gaussian MAC Channels
October 29, 2008, 12:00am PDT
In this paper, the authors first provide a Joint Source and Channel Coding (JSCC) approach in estimating Gaussian sources over Gaussian MAC channels, as well as its sufficient and necessary...
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Whitepapers
An Efficient Privacy-Preserving Scheme for Wireless Link Layer Security
October 29, 2008, 12:00am PDT
In this paper, the authors propose an efficient privacy-preserving scheme for secure packet transmission at wireless link layer. The proposed scheme is constructed by using hash values in reverse...
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Whitepapers
Computationally-Efficient, Low-Order Filtering Technique for TETRA Release 2 Synchronization
March 11, 2008, 12:00am PDT
The new TETRA Release 2 standard aims to increase the data throughput of the current TETRA 1 standard by a factor of 10. However there are serious issues with the cross-correlation based timing...
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Whitepapers
A Cluster-Based Middleware for Infrastructure Wireless Mesh Networks
March 11, 2008, 12:00am PDT
Recently, Wireless Mesh Networks (WMNs) have appeared as a promising technology, with many potential applications, for next-generation access networks and they are hence actively researched and...
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Whitepapers
Channel Estimation Assisted by Postfixed Pseudo-Noise Sequences Padded With Null Samples for Mobile OFDM Communications
March 11, 2008, 12:00am PDT
A Channel Estimation (CE) technique that uses a post-fixed pseudo-random sequence padded with zeros is investigated in this paper to extend Pseudo-Random-Postfix...
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Whitepapers
Testbed Implementation of a Secure Flooding Time Synchronization Protocol
March 11, 2008, 12:00am PDT
A fundamental building block in distributed wireless sensor networks is time synchronization. Given resource constrained nature of sensor networks, previous research has focused on developing...
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Whitepapers
Minimizing Control Management Overhead for Scalable Mobile Ad-Hoc Networks
March 11, 2008, 12:00am PDT
In this paper, the authors provide a parametric model for analyzing the control overhead usage in Mobile Ad-hoc NETworks (MANET). In particular, they focus on evaluating the impact of the...
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Whitepapers
Cooperative Multi-Hop Wireless Sensor-Actuator Networks: Exploiting Actuator Cooperation and Cross-Layer Optimizations
March 11, 2008, 12:00am PDT
Delay and energy constraints have a significant impact on the design and operation of wireless Sensor-Actuator NETworks (SANETs). Furthermore, preventing sensor nodes from being inactive is very...
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Whitepapers
Synchronization Service Integrated Into Routing Layer in Wireless Sensor Networks
March 11, 2008, 12:00am PDT
The time synchronization problem needs to be considered in a distributed system. In Wireless Sensor Networks (WSNs) this issue must be solved with limited computational, communication and energy...
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Whitepapers
A Joint Utility-Lifetime Optimization Algorithm for Cooperative MIMO Sensor Networks
March 11, 2008, 12:00am PDT
Cooperative MIMO transmission technique is considered as one of the effective solutions to reduce the energy consumption in wireless sensor networks. However, the existing cooperative MIMO based...
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Whitepapers
On the Availability of Wireless Sensor Networks
March 11, 2008, 12:00am PDT
The success of wireless sensor networks relies on effective power-saving schemes. In this paper, the authors investigate a particular operating scheme: the sensor's communication function is...
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Whitepapers
Analysis of Low Latency MAC Protocols for Clustered Sensor Networks
March 11, 2008, 12:00am PDT
In this paper, a low latency MAC protocol that can be used in sensor networks is proposed. To extend the lifetime of sensor nodes, it was used to synchronize active/sleep periods of all sensor...
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Whitepapers
Energy-Efficient Geographical Forwarding Algorithm for Wireless Ad Hoc and Sensor Networks
March 11, 2008, 12:00am PDT
Energy-efficient use is a critical issue in the design of wireless multi-hop networks such as wireless ad hoc and sensor networks. Location-based routing protocols are known to have high...
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Whitepapers
A Unified Framework for Movement-Assisted Sensor Deployment
March 11, 2008, 12:00am PDT
Coverage is a fundamental problem in sensor networks. Sensor coverage, which reflects how well a sensor network is monitored by sensors, is an important measure for the Quality of Service (QoS)...
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Whitepapers
XLRP: Cross Layer Routing Protocol for Wireless Sensor Networks
March 11, 2008, 12:00am PDT
The developments in the field of Wireless Sensor Networks (WSNs) have been accompanied by a paradigm shift from the layered protocol design to a cross layer design, which has shown its promise in...
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Whitepapers
Analysis for Localization-Oriented Coverage in Camera Sensor Networks
March 11, 2008, 12:00am PDT
Camera sensor networks have recently emerged as a very critical research topic. Target tracking and localization are important applications in camera sensor networks. In this paper, the authors...
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Whitepapers
Collaborative Target Localization in Camera Sensor Networks
March 11, 2008, 12:00am PDT
Target localization is an important application in sensor networks. Although the localization problem in acoustic/radar sensor networks has been intensively studied, few consider the problem in...
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Whitepapers
Correlation-Based Security in Time Synchronization of Sensor Networks
March 11, 2008, 12:00am PDT
It is very important to monitor the water quality of lakes since any abnormal chemical components/pollutants can possibly cause health problems. Chemical Water Sensors can be used for such...
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Whitepapers
A Distributed Protocol for Ensuring Both Probabilistic Coverage and Connectivity of High Density Wireless Sensor Networks
March 11, 2008, 12:00am PDT
Recently, Wireless Sensor Networks (WSNs) have been widely used in the fields of military affairs, intelligent family, environment surveillance and commercial management and so on. In practice,...
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Whitepapers
Implementing QoS Support in a Wireless Home Network
March 11, 2008, 12:00am PDT
Currently used Wireless Local Area Networks (WLAN) do not inherently support Quality of Service (QoS). Neither are there good solutions for mapping the application requirements to medium access...
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Whitepapers
Microwave Oven Signal Modelling
March 11, 2008, 12:00am PDT
Wireless communications are the foundation of today's information-centric culture. The Federal Communications Commission (FCC) allocates many licensed bands but the Industrial, Scientific and...
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A Novel Fair Incentive Protocol for Mobile Ad Hoc Networks
March 11, 2008, 12:00am PDT
To enhance the overall performance of a Mobile Ad hoc NETwork (MANET), people have tried to solve the issue of node selfishness, which has sparked a surge of research interests in credit-based...
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The IEEE 802.11 Power Saving Mechanism: An Experimental Study
March 11, 2008, 12:00am PDT
This paper presents an experimental study of the IEEE 802.11 power saving mechanism on PDA in a Wireless Local Area Network (WLAN). The power consumptions of the PDA in both Continuous Active Mode...
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Whitepapers
3-Dimensional Channel Modeling Using Spherical Statistics for Multiple Input Multiple Output Systems
March 11, 2008, 12:00am PDT
Recently, the Third Generation Partnership standards bodies (3GPP/3GPP2) have defined a channel model for Multiple Input Multiple Output (MIMO) systems. This model is a 2- Dimensional (2D) model...
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Whitepapers
The Throughput Analysis of Different IR-HARQ Schemes Based on Fountain Codes
March 11, 2008, 12:00am PDT
In this paper, the authors construct two novel IRHARQ schemes based on fountain codes, which combine the punctured and rateless IR-HARQ schemes, in order to attain the advantageous properties of...
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Whitepapers
Handel-C Implementation of Early-Access Partial-Reconfiguration for Software Defined Radio
March 11, 2008, 12:00am PDT
The new Xilinx Early-Access Partial-Reconfiguration (EAPR) FPGA technology exhibits a clear advantage over the former modular-based partial-reconfiguration flow. This paper compares a Handel-C...
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Whitepapers
Realistic Mobility Aware Information Gathering in Disaster Areas
March 11, 2008, 12:00am PDT
In this paper, the authors propose a method for realistic mobility aware information gathering in disaster areas. In the proposed method, a disaster area is divided into a grid, and each node's...
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Whitepapers
A Presence-Based Architecture for the Integration of the Sensing Capabilities of Wireless Sensor Networks in the IP Multimedia Subsystem
March 11, 2008, 12:00am PDT
Wireless Sensor Networks (WSN) are made up of small devices that can sense context information (e.g. space, physiology, and environment). The IP Multimedia System (IMS) aims at the convergence of...
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Whitepapers
Genetic Algorithm Aided Design of Near-Capacity Irregular Variable Length Codes
March 11, 2008, 12:00am PDT
In this paper, the authors demonstrate that their ability to match the EXtrinsic Information Transfer (EXIT) function of an Irregular Variable Length Code (IrVLC) to that of a...
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A Hybrid Routing Protocol for Wireless Sensor Networks Based on a Two-Level Clustering Hierarchy With Enhanced Energy Efficiency
March 11, 2008, 12:00am PDT
A Two-level Hierarchical Clustering based Hybrid routing Protocol (THCHP) for wireless sensor networks is proposed in this paper. The per frame time average energy dissipation performance of THCHP...
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Energy Efficient Scheme for Large Scale Wireless Sensor Networks With Multiple Sinks
March 11, 2008, 12:00am PDT
In this paper, the authors consider the multiple sinks placement problem in large-scale Wireless Sensor Networks (WSN). The objective is to determine optimal sinks' positions that maximize the...
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Energy-Efficient Routing in Wireless Sensor Networks Using Probabilistic Strategies
March 11, 2008, 12:00am PDT
Wireless Sensor Networks (WSNs) are being used in many applications in order to gather sensitive information and forward it to an analysis center. Since a WSN consists of resource-impoverished...
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Sink Location Service for Geographic Routing in Wireless Sensor Networks
March 11, 2008, 12:00am PDT
Geographic routing has been considered as an efficient, simple, and scalable routing protocol for wireless sensor networks since it exploits pure location information instead of global topology...
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Performance Analysis of Slotted Carrier Sense IEEE 802.15.4 Acknowledged Uplink Transmissions
March 11, 2008, 12:00am PDT
Advances in low-power and low-cost sensor networks have led to solutions mature enough for use in a broad range of applications, requiring various degrees of reliability. To facilitate this, a...
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Network-Assisted Sink Navigation Protocols for Data Harvesting in Sensor Networks
March 11, 2008, 12:00am PDT
This paper presents a network-assisted sink navigation mechanism in which mobile sink trajectories are computed by a sensor network for energy-efficient data collection. The key idea is that for...
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An Optimum Multiple Metrics Gateway Selection Mechanism in MANET and Infrastructured Networks Integration
March 11, 2008, 12:00am PDT
This paper proposes an optimum mechanism to select appropriate gateway based on multiple node metrics: remaining energy, mobility, and number of hops, for interconnected Mobile Ad Hoc NETwork...
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RSRP: A Robust Secure Routing Protocol for Mobile Ad Hoc Networks
March 11, 2008, 12:00am PDT
Routing scenario in ad hoc networks is different from infrastructure-based wireless networks; since in ad hoc networks each node acts as a router and is responsible for managing topological...
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Whitepapers
An Optimal Degree Distribution Design and a Conditional Random Integer Generator for the Systematic Luby Transform Coded Wireless Internet
March 11, 2008, 12:00am PDT
When designing Luby Transform (LT) codes, there are three important factors, which determine the attainable performance of the LT code, namely the degree distribution, the integer random generator...
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Whitepapers
TART: Traffic-Aware Routing Tree for Geographic Routing
March 11, 2008, 12:00am PDT
Tree routing is one of the detouring strategies employed in geographic routing to help find a detour for a packet to leave a local minimum. The effectiveness of tree routing depends on the quality...
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Autonomic Joint Session Scheduling Strategies for Heterogeneous Wireless Networks
March 11, 2008, 12:00am PDT
In order to optimize usage of radio resource for heterogeneous Radio Access Technologies (RATs) and jointly designed from the user perspective, the JOint Session sCHeduling (JOSCH) mechanism has...
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Improving BER Performance of T-DMB System by Error/Erasure Correction in RS Codes
March 11, 2008, 12:00am PDT
In this paper, the authors introduce a new scheme to improve the performance of the Terrestrial - Digital Multimedia Broadcasting (T-DMB) system, which exploits the properties of the Reed-Solomon...
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An Energy-Efficient V-BLAST Based Cooperative MIMO Transmission Scheme for Wireless Sensor Networks
March 11, 2008, 12:00am PDT
Wireless sensor networks have limited energy resource and therefore energy-efficient protocols are required to minimize the energy consumption. The Virtual MIMO technique is considered as one of...
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