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Institute of Electrical & Electronic Engineers
(11420 results)-
Whitepapers
Routing With Probabilistic Delay Guarantees in Wireless Ad-Hoc Networks
October 29, 2008, 12:00am PDT
In many wireless ad-hoc networks it is important to find a route that delivers a message to the destination within a certain deadline (delay constraint). The authors propose to identify such...
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Whitepapers
Queuing Analysis for Multiuser Downlink Channel: Throughput Regions and Exponential Backlog Bounds
October 29, 2008, 12:00am PDT
While multiuser scheduling strategies have been intensively studied recently, the resulting throughput and delay performance affecting strongly end-to-end performance of wireless communication...
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Whitepapers
A Distributed Resource Control for Fairness in OFDMA Systems : English-Auction Game With Imperfect Information
October 29, 2008, 12:00am PDT
In this paper, the authors study a distributed resource control problem achieving fairness and information theoretic capacity in an OFDMA system. For practicality, they consider an OFDMA system...
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Whitepapers
On The Effect of Antenna Height On the Characterization of The Indoor UWB Channel
October 29, 2008, 12:00am PDT
Ultra-WideBand (UWB) technology is being proposed for several short range wireless applications. Some of the applications, such as position location devices for rescue personnel, may require the...
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Whitepapers
A Novel Spatial Autocorrelation Model of Shadow Fading in Urban Macro Environments
October 29, 2008, 12:00am PDT
In this paper, the authors propose a novel spatial autocorrelation model of the shadow fading process in urban macro environments. The proposed model is based on the empirical results obtained...
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Whitepapers
Doppler Spread and Coherence Time of Rural and Highway Vehicle-to-Vehicle Channels at 5.9 GHz
October 29, 2008, 12:00am PDT
An experimental study of the Doppler coherence time properties of Vehicle-To-Vehicle (V2V) wireless channels at 5.9 GHz in both rural and highway environments is presented. Simultaneous RF and...
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Whitepapers
On the Level Crossing Rate and Average Fade Duration of Composite Multipath/Shadowing Channels
October 29, 2008, 12:00am PDT
In this paper, the authors consider composite multipath/shadowing fading channels characterized by Nakagami-m fading with Inverse Gaussian shadowing, and Rice fading with Inverse Gaussian...
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Whitepapers
Delay Analysis of Wireless Nakagami Fading Channels
October 29, 2008, 12:00am PDT
In this paper, the authors analyze the delay performance of a single user with perfect channel state information transmitting data over a wireless fading channel. They consider a dynamic resource...
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Whitepapers
Low-Complexity SQR-Based Decoding Algorithm for Quasi-Orthogonal Space-Time Block Codes
October 29, 2008, 12:00am PDT
In this paper, the authors propose a new decoding algorithm for Quasi-Orthogonal Space-Time Block Codes (QOSTBCs) which achieves near Maximum Likelihood (ML) performance while substantially...
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Whitepapers
Low-Complexity Maximum Likelihood Detection of Orthogonal Space-Time Block Codes
October 29, 2008, 12:00am PDT
Space-Time Block Codes (STBCs) from Orthogonal designs (OSTBCs) are attractive since they achieve the maximum diversity, the maximum coding gain, and the highest throughput. These codes are used...
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Whitepapers
Low-Complexity Hybrid QRD-MCMC MIMO Detection
October 29, 2008, 12:00am PDT
In this paper, the authors propose a novel hybrid QRDMCMC MIMO detector that combines the features of a QRD-M detector and a Markov Chain Monte Carlo (MCMC) detector. The QRD-M algorithm is...
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Whitepapers
QRD-QLD Searching Based Sphere Detection for Emerging MIMO Downlink OFDM Receivers
October 29, 2008, 12:00am PDT
In this paper, a detection algorithm with parallel partial candidate-search algorithm is presented. Two fully independent partial search processes are simultaneously employed for two groups of...
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Whitepapers
Novel Sort-Free Detector With Modified Real-Valued Decomposition (M-RVD) Ordering in MIMO Systems
October 29, 2008, 12:00am PDT
K-best MIMO detection technique is the prominent method of simplifying the detection complexity in MIMO systems while maintaining BER performance comparable with the optimum Maximum-Likelihood...
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Whitepapers
Uplink Ergodic Mutual Information of OFDMA-based Two-Hop Cooperative Relay Networks With Imperfect CSI
October 29, 2008, 12:00am PDT
This paper analyzes the ergodic mutual information of OFDMA cooperative relay networks when the Channel State Information (CSI) imperfection is considered at resource allocation unit. Based on 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...
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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
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...
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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
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...
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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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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...
Provided by Institute of Electrical & Electronic Engineers
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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...
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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
Cross-Layer Multiservice Scheduling for Mobile WiMAx Systems
March 11, 2008, 12:00am PDT
The authors consider a cross-layer scheme for the downlink multiuser Orthogonal Frequency Division Multiple Access (OFDMA) for mobile WiMAX (Worldwide Interoperability for Microwave Access) based...
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Whitepapers
A Hybrid ARQ Scheme Based on Shortened Low-Density Parity-Check Codes
March 11, 2008, 12:00am PDT
This paper presents a Hybrid ARQ (HARQ) scheme based on shortened low-density parity-check (LDPC) codes. Although conventional incremental Redundancy HARQ (IRHARQ) schemes based on punctured LDPC...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
Simple Proportional Fairness Scheduling for OFDMA Frame-Based Wireless Systems
March 11, 2008, 12:00am PDT
The authors propose a packet scheduling scheme called OFDMA Frame-based Proportional Fairness (OFPF) for a frame-based OFDMA wireless system. OFPF aims to maximize system throughput as well as...
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Whitepapers
The Effect of Inter-Link Dependencies on the Connectivity of Wireless Mesh Networks
March 11, 2008, 12:00am PDT
This paper presents a novel methodology for finding the network connectivity in wireless mesh networks. This methodology takes into account link dependencies in neighboring nodes. The methodology...
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Whitepapers
Vertical Handover Decision in an Enhanced Media Independent Handover Framework
March 11, 2008, 12:00am PDT
Vertical handover decision making is one of key problems in heterogeneous network environment. In IEEE 802.21 standard, a Media Independent Handover (MIH) framework is presented to facilitate...
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Whitepapers
Uplink Control Channel in E-UTRA, Radio Link and Radio Network Evaluation
March 11, 2008, 12:00am PDT
Evolved UTRA (E-UTRA) is specified by the Third Generation Partnership Project, 3GPP. E-UTRA is designed to efficiently and flexibly utilize different spectrum bands supporting high physical bit...
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Whitepapers
Low Antenna Ultra Wideband Propagation Measurements and Modeling in a Forest Environment
March 11, 2008, 12:00am PDT
Over the past decade, research and development in wireless sensor networks has investigated novel and exciting applications for a number of different scenarios. Impulse Ultra WideBand (UWB)...
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Whitepapers
Multi-Path Propagation Measurements for Vehicular Networks at 5.9 GHz
March 11, 2008, 12:00am PDT
Broadband sounding of the vehicle-to-vehicle channel is reported in suburban, rural, and highway environments. A direct sequence spread spectrum waveform based on zero correlation zone sequences...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
A Vehicle Collision Warning System Employing Vehicle-to-Infrastructure Communications
March 11, 2008, 12:00am PDT
Road safety has become an important issue and gained much attention for many years. To avoid vehicle collisions on the roads, researchers have proposed various Collision Warning Systems (CWS)...
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Whitepapers
Joint Rate and Power Adaptation for MC-CDMA Over Tempo-Spectral Domain
March 11, 2008, 12:00am PDT
This paper studies the area of link adaptation for Multi-Carrier Code Division Multiple Access (MC-CDMA) radio interface and adapts the rate and transmission power jointly over temporal as well as...
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Whitepapers
Fair OFDMA Scheduling Algorithm Using Iterative Local Search With K-Opt-Switches
March 11, 2008, 12:00am PDT
Orthogonal Frequency Division Multiple Access (OFDMA) enables dynamically scheduling users on frequencies with good channel quality, exploiting multiuser diversity. Modulation levels on different...
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Whitepapers
Cell Planning for Cooperative Transmission
March 11, 2008, 12:00am PDT
Cooperative Transmission (CT) (i.e. base station cooperation, multicell transmission) techniques have been shown to theoretically increase the average and cell-edge spectral efficiencies of...
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Whitepapers
Automatic Construction of Cognitive Radio Network
March 11, 2008, 12:00am PDT
This paper presents a scheme for cognitive radio network construction. Incorporating the available spectrum, cognitive radio nodes automatically construct a local area network. The active...
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Whitepapers
In-Band Sensing Without Quiet Period in Cognitive Radio
March 11, 2008, 12:00am PDT
Sensing is one of the key technologies for the implementation of cognitive radio. The usual In-band sensing is performed during quiet period to avoid the interference from the network itself. In...
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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...
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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...
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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...
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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...
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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...
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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
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...
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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
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...
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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...
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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
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...
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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
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...
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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
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.,...
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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
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
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
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...
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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
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
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
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
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
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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