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Institute of Electrical & Electronic Engineers
(11420 results)-
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
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
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
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
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
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
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
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
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
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
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
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
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
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
Downlink Control Channel Design for 3GPP LTE
March 11, 2008, 12:00am PDT
With the emergence of packet-based wireless broadband systems, work has begun on Long Term Evolution (LTE) of the UMTS Terrestrial Radio Access and Radio Access Network aimed for commercial...
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Whitepapers
Using Incompletely Cooperative Game Theory in Wireless Sensor Networks
March 11, 2008, 12:00am PDT
In WSNs, energy conservation is the primary goal, while throughput and delay are less important. So used energy is traded for throughput and delay. In this paper, a novel concept of incompletely...
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Whitepapers
WiMAX Fast-Moving Access Network
March 11, 2008, 12:00am PDT
Facing the challenge of providing broadband access to high speed vehicle on motorway scenario, this paper1discloses a fibre network employing star-tree architecture with a central control system...
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Whitepapers
Dynamic Packet Selection for H.264 Video Streaming Over IEEE 802.11e WLANs
March 11, 2008, 12:00am PDT
Because wireless channel condition is time-varying, the allocated bandwidth is usually not fixed. Therefore, it is a challenge to guarantee QoS, especially for bandwidth-consuming and...
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Whitepapers
Security Considerations for Handover Schemes in Mobile WiMAX Networks
March 11, 2008, 12:00am PDT
IEEE 802.16e uses EAP-based authentication and key management for link layer security. Due to the lack of ability to support mobility, however, EAP-based key management becomes a principal...
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Whitepapers
Frequency-Domain Link Adaptation for Wideband OFDMA Systems
March 11, 2008, 12:00am PDT
A novel frequency-domain Mutual-Information-based Adaptive Coding and Modulation (MI-ACM) link adaptation technique has been developed in the European research project WINNER. On the link level,...
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Whitepapers
An Opportunistic Scheduling Scheme With Minimum Data-Rate Guarantees for OFDMA
March 11, 2008, 12:00am PDT
The authors tackle the problem of providing minimum data-rate guarantees for different classes-of-service in an OFDMA-based network, while obtaining a high system throughput. Their approach is...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
PAMP: Power-Aware Multi-Path Routing Protocol for a Wireless Ad Hoc Network
March 11, 2008, 12:00am PDT
In a wireless ad hoc network, the limited energy of the nodes is one of major challenges. Many research works are proposed to solve this issue from various aspects. The authors' work focuses on...
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Whitepapers
DSML: Dual Signal Metrics for Localization in Wireless Sensor Networks
March 11, 2008, 12:00am PDT
In wireless sensor networks and wireless ad-hoc networks, localization systems have used diverse signal metrics such as Received Signal Strength Indicator (RSSI) and Time Difference of Arrival...
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Whitepapers
Statistical Analysis of the IEEE 802.15.4a UWB PHY Over Multipath Channels
March 11, 2008, 12:00am PDT
This paper shows the application of a recently proposed statistical characterization of the Ultra-WideBand (UWB) radio channel to the standardized IEEE 802.15.4a UWB PHYsical layer (PHY). The...
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Whitepapers
Optimal Relay Location in Multi-Hop Cellular Systems
March 11, 2008, 12:00am PDT
Relay Stations (RSs) are usually used to enhance the signal strength for the users close to the cell boundary. However, transmission through a relay station needs two transmission phases, i.e.,...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
On the Diversity-Multiplexing Tradeoff of Concurrent Decode-and-Forward Relaying
March 11, 2008, 12:00am PDT
In this paper, the Diversity-Multiplexing Tradeoff (DMT) behavior of a novel concurrent Decode-and-Forward (DF) relaying cooperative diversity transmission protocol is analyzed. A two-source...
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Whitepapers
Energy-Aware Co-Operative (ECO) Relay-Based Packet Transmission in Wireless Networks
March 11, 2008, 12:00am PDT
In infrastructure wireless networks, nodes at the edge of the coverage area need to spend more energy to transmit their packets than those close to the Access Point (AP). Less energy is required...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
Energy-Distortion-Authentication Optimized Resource Allocation for Secure Wireless Image Streaming
March 11, 2008, 12:00am PDT
Joint consideration of energy efficiency, multimedia quality and media authenticity has largely been overlooked in the studies of secure wireless multimedia streaming. In this paper, the authors...
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Whitepapers
Selective Relaying in Cooperative OFDM Systems: Two-Hop Random Network
March 11, 2008, 12:00am PDT
In this paper, the authors investigate two selective relaying schemes in cooperative OFDM systems. Selective OFDMA relaying, where the relay selection is performed in a per-subcarrier manner, and...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
Ubiquitous Terminal Assisted Positioning Prototype
March 11, 2008, 12:00am PDT
Statistical terminal assisted mobile positioning is a methodology that enhances the performance of existing localization techniques, by exploiting historical measurements collected at the terminal...
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Whitepapers
On the Uplink Capacity of an 802.16j System
March 11, 2008, 12:00am PDT
A multihop relay extension for IEEE 802.16e systems is the subject of ongoing standardization activities within the IEEE 802.16j Task Group. The emerging IEEE 802.16j standard enhances the 802.16e...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
Service Discovery in Wireless Mesh Networks
March 11, 2008, 12:00am PDT
This paper proposes an approach for service discovery in Wireless Mesh Networks called OLSR-mDNS which supports both routing and non-routing clients. Therefore, the multicast DNS (mDNS) protocol...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
Orthogonalizing Transmission in MIMO With Linear Receiver and Finite MCS Set
March 11, 2008, 12:00am PDT
Multiantenna transmissions based on linear precoding have been investigated intensely both for single stream diversity transmissions and for multi-stream spatial multiplexing transmissions. When...
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Whitepapers
Frequency Selective OFDMA Scheduler With Limited Feedback
March 11, 2008, 12:00am PDT
Orthogonal Frequency Division Multiple Access (OFDMA) is the preferred multiple access scheme for future broadband cellular systems as it provides high spectral efficiency. The choice of OFDMA...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
Hardware Impairments on LDPC Coded SC-FDE and OFDM in Multi-Gbps WPAN (IEEE 802.15.3c)
March 11, 2008, 12:00am PDT
The Multi-Gbps Wireless Personal Area Network (WPAN) using 60-GHz is being standardized in the task group of IEEE 802.15.3c. In the PHYsical (PHY) layer design, there are two competitive...
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Whitepapers
On the Deployment of Mobile Trusted Modules
March 11, 2008, 12:00am PDT
In its recently published TCG Mobile Reference Architecture, the TCG Mobile Phone Work Group specifies a new concept to enable trust into future mobile devices. For this purpose, the TCG devises a...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
An Adaptive Energy Saving Mechanism in the Wireless Packet Access Network
March 11, 2008, 12:00am PDT
The next generation wireless communication systems will be based on the "All-IP" structure and the Wireless Packet Access Network (WPAN) will have a dominant future. Mobility is one of main...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
On the Time Distribution of White Space Access Opportunities
March 11, 2008, 12:00am PDT
In the future, secondary radios may exploit to use the spectrum holes (or white space) available over a given frequency band for transmission, provided the performance of the primary radio using...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
Link Performance of WiMAX PUSC
March 11, 2008, 12:00am PDT
Link performance of WiMAX (802.16e) downlink and uplink using Partial Usage Sub-Channelization (PUSC) is evaluated through link-level simulations. WiMAX using single transmit and two receive...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
Vertical Handoff Decision Scheme Using MADM for Wireless Networks
March 11, 2008, 12:00am PDT
Wireless environment is expected to support heterogeneous wireless access technologies. The objective is the support of a diverse range of high-data rate multimedia services. The main issue in...
Provided by Institute of Electrical & Electronic Engineers
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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...
Provided by Institute of Electrical & Electronic Engineers
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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...
Provided by Institute of Electrical & Electronic Engineers
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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...
Provided by Institute of Electrical & Electronic Engineers
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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)...
Provided by Institute of Electrical & Electronic Engineers
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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
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)...
Provided by Institute of Electrical & Electronic Engineers
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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
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
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...
Provided by Institute of Electrical & Electronic Engineers
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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...
Provided by Institute of Electrical & Electronic Engineers
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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
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
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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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
Horizontal Aggregations in SQL to Prepare Data Sets for Data Mining Analysis
January 1, 2012, 12:00am PST
Preparing a data set for analysis is generally the most time consuming task in a data mining project, requiring many complex SQL queries, joining tables and aggregating columns. Existing SQL...
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Whitepapers
A Cognitive Framework for Improving Coexistence Among Heterogeneous Wireless Networks
October 29, 2008, 12:00am PDT
In this paper, the authors study the channel estimation problem for the Two-way Wireless Relay Network (TWRN) where two terminals exchange their information through a relay node in a...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
Sensing-Based Spectrum Sharing in Cognitive Radio Networks
October 29, 2008, 12:00am PDT
In this paper, a new spectrum sharing model called sensing-based spectrum sharing is proposed for cognitive radio networks. This model consists of two phases: in the first phase, the Secondary...
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Whitepapers
A Comparison of Three Classes of Spectrum Sensing Techniques
October 29, 2008, 12:00am PDT
Spectrum sensing is used to identify the (temporarily) unused (licensed) frequency bands and as such plays a key role in dynamic spectrum access. Spectrum sensing is currently being investigated...
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Whitepapers
GLRT-Based Spectrum Sensing for Cognitive Radio
October 29, 2008, 12:00am PDT
In this paper, the authors propose several spectrum sensing methods designed using the Generalized Likelihood Ratio Test (GLRT) paradigm, for application in a cognitive radio network. The proposed...
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Whitepapers
Robust Designs for MISO-Based Cognitive Radio Networks With Primary User's Partial Channel State Information
October 29, 2008, 12:00am PDT
Cognitive radio is an emerging technology improving the spectrum utilization efficiency in communication systems. In this paper, the authors are interested in a Multiple-Input Single-Output (MISO)...
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Whitepapers
MIMO Transmitter Optimization With Mean and Covariance Feedback for Low SNR
October 29, 2008, 12:00am PDT
Multiple-input multiple-output system capacity can be improved when there is Channel State Information at the Transmitter (CSIT). This paper proposes a transmission optimization strategy that aims...
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Whitepapers
High-Rate Space-Time Coded Large MIMO Systems: Low-Complexity Detection and Performance
October 29, 2008, 12:00am PDT
Large MIMO systems with tens of antennas in each communication terminal using full-rate non-orthogonal Space-Time Block Codes (STBC) from Cyclic Division Algebras (CDA) can achieve the benefits of...
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Whitepapers
A New Diagonally Layered Spatial Multiplexing Scheme With Partial Channel Knowledge
October 29, 2008, 12:00am PDT
Vertical layering with Successive Interference Cancellation (SIC) at the receiver (e.g., V-BLAST) is a popular spatial multiplexing scheme that achieves high data rates over multi-antenna wireless...
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Whitepapers
Performance of MIMO HARQ Under Receiver Complexity Constraints
October 29, 2008, 12:00am PDT
Hybrid Automatic Repeat reQuest (HARQ) schemes are becoming common in wireless systems. In addition to the channel characteristics, several system design considerations need to be taken into...
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Whitepapers
Generalized Differential Transmission for STBC Systems
October 29, 2008, 12:00am PDT
Recent research has shown that Differential Transmission (DT) can be applied to STBC systems so that the receiver does not need Channel State Information (CSI) when compared to coherent detector....
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Whitepapers
Packet Length Optimization for MIMO Mobile Systems With Estimated CSI
October 29, 2008, 12:00am PDT
The reliability of mobile packet data transmission in Multi-Input Multi-Output (MIMO) communication systems is degraded by time-varying multi-path channel fading. This so-called Doppler-effect can...
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Whitepapers
Orthogonal Space-Time Block Codes Over Semi-Identical Channels With Channel Estimation
October 29, 2008, 12:00am PDT
Assuming the channel gains associated with different receive antennas are not identically distributed, the authors study the orthogonal space-time block codes over non-identical channels with...
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Whitepapers
Ranging Signal Designs for MIMO-OFDMA Systems
October 29, 2008, 12:00am PDT
In this paper, the authors propose new ranging signal designs for time-division duplexing Multiple Input Multiple Output (MIMO) Orthogonal Frequency Division Multiple Access (OFDMA) systems....
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Whitepapers
Data Detection for Doubly-Selective MIMO Channels Using Decision-Directed Channel Tracking and Exponential Basis Models
October 29, 2008, 12:00am PDT
The authors present a decision-directed tracking approach to doubly-selective MIMO channel estimation, exploiting the Complex Exponential Basis Expansion Model (CE-BEM) for the overall channel...
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Whitepapers
Robust Channel Tracking in Fast Fading MIMO Channels
October 29, 2008, 12:00am PDT
Channel estimation for Alamouti Space Frequency Coded (ASFC) 2×2 and 2×1 MIMO OFDM systems, employing Decision Directed Channel Tracking (DDCT) for high fade rates and long frame durations is...
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Whitepapers
Short Term Link Performance Modeling for ML Receivers With Mutual Information Per Bit Metrics
October 29, 2008, 12:00am PDT
Link performance abstraction with simplified models that accurately capture the decoded receiver performance under fading channels has several applications. Such models help a receiver estimate a...
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Whitepapers
Performance Analysis of a Partially Coherent System Using Constellation Rotation and Coordinate Interleaving
October 29, 2008, 12:00am PDT
Coherent detection of M-ary Phase Shift Keying (MPSK) signals requires the generation or extraction of a local carrier phase reference. In most applications a perfect local reference is not...
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Whitepapers
A General Exact Formulation for the Outage Probability in Interference-Limited Systems
October 29, 2008, 12:00am PDT
This paper presents a useful, novel formulation for the outage probability in interference-limited communication systems, here named Joint Outage Probability (JOP). Given a set of SIR restrictions...
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Whitepapers
The Influence of the Severity of Fading and Shadowing on the Statistical Properties of the Capacity of Nakagami-Lognormal Channels
October 29, 2008, 12:00am PDT
This paper deals with the study of the statistical properties of the capacity of Nakagami-Log-Normal (NLN) channels for various fading environments. Specifically, the impact of shadowing and the...
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Whitepapers
User Capacity of Rician and Nakagami Fading Broadcast Channels
October 29, 2008, 12:00am PDT
Transmission over wireless channels is severely affected by multi-path propagation. To model this phenomenon in wireless communications, different statistical models have been proposed and fading...
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Whitepapers
Maximizing Transport Capacity for Geographic Transmission on Nakagami-m Channels
October 29, 2008, 12:00am PDT
In Mobile Ad hoc NETworks (MANETs), conventional packet forwarding schemes that pre-select the next-hop receivers for a packet may fail if the channel coherence time is on the order of the typical...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
Positioning in Wireless Sensor Networks Using Array Processing
October 29, 2008, 12:00am PDT
In this paper, a novel positioning approach for Wireless Sensor Networks (WSNs) is proposed. The approach locates a given target node by using a number of surrounding anchor nodes as an array of...
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Whitepapers
On Optimal Transmission Range for Multihop Cellular Networks
October 29, 2008, 12:00am PDT
Multihop Cellular Network (MCN) combines the best features of both conventional Single hop Cellular Network (SCN) and Ad-hoc networks. In MCN, mobile terminals transmit packets to base stations as...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
MAC-PDU Size Optimization for OFDMA Modulated Wireless Relay Networks
October 29, 2008, 12:00am PDT
Hop adaptive MAC-PDU (Protocol Data Unit) size optimization is proposed for Orthogonal Frequency Division Multiple Access (OFDMA) based wireless relay networks. Such optimization improves the...
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Whitepapers
Performance Analysis for OFDMA Downlink Relay Systems: Relay Gain and Fairness
October 29, 2008, 12:00am PDT
This paper defines a new metric: a relay gain that measures the performance gain of users using relaying channels at distance s from a base station. The paper derives the closed form of the relay...
Provided by Institute of Electrical & Electronic Engineers
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