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Institute of Electrical & Electronic Engineers
(11422 results)-
Whitepapers
Optimum MIMO-OFDM Receivers With Imperfect Channel State Information
October 29, 2008, 12:00am PDT
Channel estimation inaccuracy is known to affect significantly the error performance of coded communication systems. This applies in particular to broadband MIMO channels, often considered in...
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Whitepapers
Performance of MIMO Channel Models With Channel State Information at the Transmitter
October 29, 2008, 12:00am PDT
The performance benefits of Multiple Input Multiple Output (MIMO) antenna systems in increasing the throughput of a communication system depends on the type and quality of the information sent to...
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Whitepapers
Bit-Flipping Equalizer and ML Search-Space Analysis in Ultra-Wideband MIMO Channels
October 29, 2008, 12:00am PDT
In this paper, the authors propose a low-complexity equalizer whose performance approaches that of the optimum Maximum-Likelihood (ML) estimator, in Ultra-WideBand (UWB) Multiple-Input...
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Whitepapers
DFE-Based Receiver Implementation for MIMO Systems Employing Hybrid ARQ
October 29, 2008, 12:00am PDT
The implementation of Decision Feedback Equalization-based receivers for MIMO systems that employ Hybrid ARQ (HARQ) is considered. It is shown how the theory of MIMO Decision Feedback Equalization...
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Whitepapers
Direct Location Estimation for MIMO Systems in Multipath Environments
October 29, 2008, 12:00am PDT
Location estimation in Multipath Environments (ME) can lead to significantly higher accuracy if the information contained in the Non-Line-Of-Sight (NLOS) signal components is exploited thoroughly...
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Whitepapers
Using Higher Order Cyclostationarity to Identify Space-Time Block Codes
October 29, 2008, 12:00am PDT
Research in cognitive radios has renewed interest in tools, such as spectrum estimation and modulation identification, to characterize the Radio Frequency (RF) environment. The use of multiple...
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Whitepapers
Performance Analysis of Space-Time Block Coding With Co-Channel MIMO Interferers
October 29, 2008, 12:00am PDT
When MIMO techniques are used in a cellular system, the interference environment can become quite complicated. In this paper, the authors evaluate the impact of co-channel MIMO interference on the...
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Whitepapers
Adaptive Codebooks for Efficient Feedback Reduction in Cooperative Antenna Systems
October 29, 2008, 12:00am PDT
This paper presents an adaptive codebook design method, which introduces a transition probability based codeword sorting scheme in an effort to reduce the feedback overhead by exploiting the...
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Whitepapers
Analysis and Design of Distributed Space-time Trellis Code With Asynchronous Amplify-and-Forward Relaying
October 29, 2008, 12:00am PDT
In this paper, the authors study the asynchronous cooperative diversity schemes employing the Amplify-and-Forward (AF) protocols over the frequency-selective channel. They consider three...
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Whitepapers
High-Rate Groupwise STBC Using Low-Complexity SIC Based Receiver
October 29, 2008, 12:00am PDT
In this paper, using diagonal signal repetition, the authors propose a high-rate Groupwise Space-Time Block Code (GSTBC) which can be effectively decoded by a low-complexity Successive...
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Whitepapers
Easily Invertible Tight Bounds for Diversity Reception
October 26, 2008, 12:00am PDT
Diversity techniques will play a key role in next generation wireless communication systems, thus system design will benefit from a clear understanding of how these techniques affect system...
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Whitepapers
Intra-Vehicle UWB Channel Measurements and Statistical Analysis
October 29, 2008, 12:00am PDT
Ultra-WideBand (UWB) technique attracts attention from automotive manufacturers as a potential way to construct intra-vehicle wireless sensor network. This paper reports the authors' preliminary...
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Whitepapers
Pilot-Aided Multicarrier Wireless Channel Estimation Via MMSE Polynomial Interpolation
October 29, 2008, 12:00am PDT
Orthogonal Frequency Division Multiplexing (OFDM) and Multiple Access (OFDMA) signal receivers often employ pilot-aided channel estimation. For it, an often considered technique is...
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Whitepapers
Channel Estimation and Mitigation Techniques for OFDM in a Doppler Spread Channel
October 29, 2008, 12:00am PDT
The performance of OFDM modulation degrades in a Doppler spread channel due to Inter-Carrier Interference (ICI). Multirate sampling theory and a detection scheme, called Sequential Interference...
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Whitepapers
A Low-Complexity Iterative Channel Estimation and Detection Technique for Doubly Selective Channels
October 29, 2008, 12:00am PDT
In this paper, the authors propose a low-complexity iterative joint channel estimation, detection and decoding technique for doubly selective channels. The key is a segment-by-segment Frequency...
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Whitepapers
DSL Crosstalk Coefficient Acquisition Using SNR Feedback
October 29, 2008, 12:00am PDT
Rapid acquisition of accurate crosstalk estimates is a core requirement for effective precoding in Digital Subscriber Line (DSL) systems. It is shown that Signal-to-Noise Ratio (SNR) reports...
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Whitepapers
Transmitter-Based Minimization of Error Rates in the Downlink of Wireless Systems
October 29, 2008, 12:00am PDT
Using CDMA technology, one has to contend with interference in frequency-selective channels caused by multipath propagation and fading. Transmitter-based methods such as Zero Forcing Joint...
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Whitepapers
A Robust Joint Model-Based Demodulator for Continuous Phase Modulation Signals in an Unknown Environment
October 29, 2008, 12:00am PDT
Cellular communications systems often suffer from co-channel interference, due to signals from adjacent cells interfering with each other. Previous demodulation techniques have relied on...
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Whitepapers
Joint MAP Detection for MIMO-OFDM Systems
October 29, 2008, 12:00am PDT
In this paper, a joint Maximum A Posteriori (MAP) detection algorithm is proposed for Multiple-Input Multiple-Output Orthogonal Frequency Division Multiplexing (MIMO-OFDM) systems. Without the...
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Whitepapers
Optimizing Enhanced Hierarchical Modulations
October 29, 2008, 12:00am PDT
Though hierarchical modulation offers an important coverage and throughput tradeoff for wireless communications, it has received relatively little attention to date. Traditional hierarchical...
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Whitepapers
Towards the Performance of ML and the Complexity of MMSE - A Hybrid Approach
October 29, 2008, 12:00am PDT
In this paper, the authors present a near ML-achieving sphere search technique that reduces the number of search operations significantly over existing Sphere Decoding (SD) algorithms. While the...
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Whitepapers
Maximum Likelihood Based Modulation Classification for Unsynchronized QAMs
October 29, 2008, 12:00am PDT
The authors consider modulation classification for Quadrature Amplitude Modulation (QAM) formats. The received signal is assumed to be unsynchronized in both time and frequency, since in practice...
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Whitepapers
Impact of Signaling Schemes on Iterative Linear Minimum-Mean-Square-Error Detection
October 29, 2008, 12:00am PDT
In this paper, the authors study the iterative detection problem for a coded system with multi-ary modulation. They show that, with iterative Linear Minimum-Mean-Square-Error (LMMSE) detection,...
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Whitepapers
Filter Design With Secrecy Constraints: The Degraded Parallel Gaussian Wiretap Channel
October 29, 2008, 12:00am PDT
The authors introduce the problem of filter design with secrecy constraints in the classical wiretap scenario, where two legitimate parties, Alice and Bob, communicate in the presence of an...
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Whitepapers
Performance Enhancement of Channel-Phase Precoded Ultra-Wideband (CPP-UWB) Systems by Rake Receivers
October 29, 2008, 12:00am PDT
The authors propose to use the Rake receiver to improve the system performance by collecting more signal power in an Ultra-WideBand (UWB) system precoded by the channel phase information, called...
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Whitepapers
Effective Frame Level Rate Control for H.264/AVC Video Coding
October 29, 2008, 12:00am PDT
In this paper, the authors present a robost frame level rate control algorithm for H.264/AVC compression standard. Particularly, they propose a simple yet effective approach to deal with B frames,...
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Whitepapers
All-Optical Picosecond Signal Processing in a M-Z Interferometer Based on a Multi-Section Semiconductor Optical Amplifier
October 29, 2008, 12:00am PDT
New features of the Cross-Gain Modulation and the Cross-Phase Modulation in a nonlinear active device, made by a cascade of differently biased Semiconductor Optical Amplifiers, have been...
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Whitepapers
Joint Transmit Power and Filter Tap Allocation in DMT Transmitters With Per-Tone Pulse Shaping
October 29, 2008, 12:00am PDT
Per-tone pulse shaping has been proposed as an alternative to time domain spectral shaping for Discrete Multi-Tone (DMT) transmitters, e.g. VDSL modems. This enables the transmitter to use more...
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Whitepapers
Low-Complexity Iterative Detection for Spectral Efficient Cooperative Transmission
October 29, 2008, 12:00am PDT
This paper proposes a low-complexity iterative detection scheme with cooperative transmission for Single-Carrier Frequency-Domain Equalization (SC-FDE). To increase the spectral efficiency, a...
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Whitepapers
MMSE Estimation of Distributely Coded Correlated Gaussian Sources Using Random Projections
October 29, 2008, 12:00am PDT
Recent developments in compressed sensing have shown that if a signal has a low Kolmogorov complexity, then it can be reconstructed from a certain number of random projections. The authors study...
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Whitepapers
Frequency Estimation Using Multiple Disjoint Pilot Blocks in Burst-Mode Communications
October 29, 2008, 12:00am PDT
A practical data-aided frequency estimator, suitable for use in burst-mode communications, is described and analyzed. The estimator is based on pilot symbols organized into disjoint blocks...
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Whitepapers
Second-order Cyclostationarity of Cyclically Prefixed Single Carrier Linear Digital Modulations With Applications to Signal Recognition
October 29, 2008, 12:00am PDT
The second-order cyclostationarity of Cyclically Prefixed Single Carrier Linear Digital (CP-SCLD) modulated signals is investigated with emphasis on its applicability to signal recognition....
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Whitepapers
Digital-PLL Assisted Frequency Estimation With Improved Error Variance
October 29, 2008, 12:00am PDT
In this paper, the authors present a novel frequency estimation technique, assisted by an imperfect second order arctan based Digital Phase-Locked Loop (D-PLL), for complex single sinusoidal...
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Whitepapers
A Fast Least-Squares Solution-Seeker Algorithm for Vector-Perturbation
October 29, 2008, 12:00am PDT
Finding the least-squares solution to a system of linear equations where the unknown vector is comprised of integers, but the matrix coefficient and given vector are comprised of real or complex...
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Whitepapers
Enhancement of the Iterative Spectrum Balancing Algorithm for Power Allocation in DSL Systems
October 29, 2008, 12:00am PDT
The optimization of power allocation in DSL systems is a well studied non-convex problem. In recent years many algorithms have been proposed to solve this problem, but due to the non-convexity,...
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Whitepapers
A Simple Method to Enhance the Detection of Second Order Cyclostationarity
October 29, 2008, 12:00am PDT
Cyclostationarity is a significant feature of numerous physical and man-made processes. Especially in wireless communications, it has been explored and applied for many processing, like timing and...
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Whitepapers
Analysis and Algorithm for Non-Pilot-Aided Channel Length Estimation in Wireless Communications
October 29, 2008, 12:00am PDT
Channel estimation and equalization techniques are crucial for the ubiquitous wireless communication systems. Conventional receivers for most wireless standards preset the channel length to the...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
Blind Crosstalk Channel Identification in DMTBased DSL Systems
October 29, 2008, 12:00am PDT
This paper describes a blind crosstalk channel identification method and its application to Discrete MultiTone (DMT)-based Digital Subscriber Line (DSL) systems. Cyclostationarity inherited in...
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Whitepapers
Analyzing the Effect of Channel Estimation Errors on the Average Block Error Probability of a MISO Transmit Beamforming System
October 29, 2008, 12:00am PDT
The authors address the problem of analyzing the effect of channel estimation errors on the average BLock Error Probability (BLEP) of transmit beamforming Multiple Input Single Output (MISO)...
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Whitepapers
Joint ARQ Receiver Design for Bandwidth Efficient MIMO Systems
October 29, 2008, 12:00am PDT
In this paper, the authors develop a joint ARQ receiver design for channel estimation and equalization under bandwidth efficient Automatic Repeat reQuest (ARQ) in Multiple-Input Multiple-Output...
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Whitepapers
Human Society Inspired Dynamic Spectrum Access Networks: The Effect of Parochialism
January 17, 2012, 12:00am PST
In this paper, the authors investigate the parochialism in dynamic spectrum access networks and its effect on spectrum resource competition and self-coexistence among cognitive radio secondary...
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Whitepapers
Antenna Selection in Interference-Constrained Underlay Cognitive Radios: SEP-Optimal Rule and Performance Benchmarking
February 1, 2013, 12:00am PST
In the underlay mode of cognitive radio, secondary users are allowed to transmit when the primary is transmitting, but under tight interference constraints that protect the primary. However, these...
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Whitepapers
Training for Antenna Selection in Time-Varying Channels: Optimal Selection, Energy Allocation, and Energy Efficiency Evaluation
April 3, 2013, 12:00am PDT
Single receive Antenna Selection (AS) is a popular method for obtaining diversity benefits without the additional costs of multiple radio receiver chains. Since only one antenna receives at any...
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Whitepapers
A Virtual MIMO Path-Time Code for Cognitive Ad Hoc Networks
January 1, 2013, 12:00am PST
Cognitive Radio Networks (CRNs) consisting of opportunistic links greatly elevate the networking throughput per bandwidth in future wireless communications. In this paper, the authors show that by...
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Whitepapers
A Predator-Prey Model for Dynamics of Cognitive Radios
March 1, 2013, 12:00am PST
Cognitive radio technology is well-known to enhance spectrum utilization via opportunistic transmission at link level. However, the time dynamics of spectrum utilization among primary system users...
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Whitepapers
Evaluation of Wireless Resonant Power Transfer Systems With Human Electromagnetic Exposure Limits
October 25, 2012, 12:00am PDT
This paper provides recommendations for scientifically sound methods of evaluating compliance of wireless power transfer systems with respect to human electromagnetic exposure limits. Methods for...
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Whitepapers
Delay-Optimal Power Control Policies
October 1, 2012, 12:00am PDT
The Delay Till Success (DTS) is the mean number of transmissions needed, averaged over the fading, until a single packet is successfully received (decoded) over a wireless link. This paper shows...
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Whitepapers
Spatial Stochastic Models and Metrics for the Structure of Base Stations in Cellular Networks
February 1, 2013, 12:00am PST
The spatial structure of Base Stations (BSs) in cellular networks plays a key role in evaluating the downlink performance. In this paper, different spatial stochastic models (the Poisson Point...
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Whitepapers
Joint Design of Channel and Network Coding for Star Networks
December 18, 2012, 12:00am PST
Channel coding alone is not sufficient to reliably transmit a message of finite length K from a source to one or more destinations as in, e.g., file transfer. To ensure that no data is lost, it...
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Whitepapers
The Local Delay in Mobile Poisson Networks
January 20, 2013, 12:00am PST
For communication between two neighboring nodes in wireless networks, the local delay, which is defined as the time it takes a node to successfully transmit a packet, is an important quantity....
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Whitepapers
Managing Interference Correlation Through Random Medium Access
April 2, 2013, 12:00am PDT
The capacity of wireless networks is fundamentally limited by interference. However, little research has focused on the interference correlation, which may greatly increase the local delay (namely...
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Whitepapers
Stochastic Geometry for Modeling, Analysis, and Design of Multi-Tier and Cognitive Cellular Wireless Networks: A Survey
April 20, 2013, 12:00am PDT
For more than three decades, stochastic geometry has been used to model large-scale ad hoc wireless networks, and it has succeeded to develop tractable models to characterize and better understand...
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Whitepapers
Random Backoff Control to Thwart Malicious Behavior in WLANs
February 8, 2013, 12:00am PST
Providing a fair and secure medium access scheme is a fundamental requirement in centralized wireless networks. However, IEEE 802.11 systems do not provide any fairness control mechanism and...
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Whitepapers
Channel and Traffic Status Aware Relay Selection and Traffic Queue a Nalysis in Wireless User-Relaying Networks
August 10, 2012, 12:00am PDT
User relaying is a very effective technique to achieve cooperative diversity in wireless networks. In this paper, a new relay selection scheme is proposed jointly considering the channel...
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Whitepapers
Design and Performance Investigation of a Dual-Element PIFA Array at 2.5 GHz for MIMO Terminal
July 16, 2009, 12:00am PDT
A study is described of a modified Planar Inverted-F Antenna (PIFA) operating in 2.5 GHz band on a Printed Circuit Board (PCB) of a mobile phone handset. The antenna dimension is reduced...
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Whitepapers
Stacked Patch Circular Polarized Antenna for GPS/Galileo Receiver Applications
May 29, 2012, 12:00am PDT
Global Positioning System (GPS) is a satellite radio navigation system that makes use of a Medium Earth Orbit (MEO) satellite constellation for positioning and navigation. Presently, several...
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Whitepapers
Performance Evaluation of Power Control Algorithm for TV White Space Resource in UK
January 22, 2013, 12:00am PST
The digital switchover plan in the UK, expected to be completed in 2012, is capable of freeing up a total of about 240MHz TV bandwidth. This includes the license-exempt access to TV White Spaces...
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Whitepapers
Reviews on Cognitive Access to TV White Space
January 22, 2013, 12:00am PST
TV White Space (TVWS) is a large portion of vacant spectrum in UHF/VHF bands that are created during the Digital Switch-Over (DSO) for the higher spectrum efficiency of Digital TV. The newly...
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Whitepapers
Cognitive and Cooperative Communications in Wireless Heterogeneous Networks (HetNet): Current Status and Technical Perspectives
January 22, 2013, 12:00am PST
Cognitive network and cooperative communications are two promising techniques for efficient utilization of scarce radio resources and guaranteeing Quality of Services (QoS) in wireless...
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Whitepapers
Single Feed Stacked Patch Circular Polarized Antenna for Triple Band GPS Receivers
October 1, 2012, 12:00am PDT
A novel design of a circular polarized antenna for multiband GPS receivers is presented. The design employs the concept of multistacked patches fed through a single coaxial probe. Three patches...
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Whitepapers
On the Study of Outage Performance for Cognitive Relay Networks (CRN) With the Nth Best-Relay Selection in Rayleigh-Fading Channels
February 1, 2013, 12:00am PST
Relay selection is an effective way to achieve considerable performance gains in Cognitive Relay Networks (CRN). In practice, the best relay may not always be selected, thus the study of the Nth...
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Outage Performance Study of Cognitive Relay Networks With Imperfect Channel Knowledge
January 1, 2013, 12:00am PST
This paper presents the outage performance analysis for a Cognitive Relay Network (CRN) with imperfect channel knowledge estimations. Under the condition of imperfect Channel State Information...
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Whitepapers
Evaluating the Performance of IEEE 802.11 Network Using RTS/CTS Mechanism
October 25, 2007, 12:00am PDT
In order to effectively analyze the performance of Wireless Local Area Networks (WLANs), it is important to identify what types of network settings can cause bad performance. Low throughput, high...
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Whitepapers
Is Early Warning of an Imminent Worm Epidemic Possible?
October 12, 2009, 12:00am PDT
Network intrusion detection is performed by monitoring network traffic and detecting the evidence of attacks by scanning known signatures (misuse detection) or recognizing anomalous traffic...
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Whitepapers
In-Network Live Snapshot Service for Recovering Virtual Infrastructures
August 1, 2011, 12:00am PDT
Infrastructure as a Service (IaaS) has become an increasingly popular type of service for both private and public clouds. The virtual infrastructures that enable IaaS support multi-tenancy by...
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Whitepapers
VNsnap: Taking Snapshots of Virtual Networked Infrastructures in the Cloud
December 1, 2012, 12:00am PST
A Virtual Networked Infrastructure (VNI) consists of Virtual Machines (VMs) connected by a virtual network. Created for individual users on a shared cloud infrastructure, VNIs reflect the concept...
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Whitepapers
Sensor-Assisted Localization in Cellular Systems
December 1, 2007, 12:00am PST
The authors investigate the use of an auxiliary network of sensors to locate mobiles in a cellular system, based on the received signal strength at the sensor receivers from a mobile's...
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Whitepapers
A Diversified and Correct-by-Construction Broadcast Service
September 24, 2012, 12:00am PDT
An application can be made fault-tolerant by replicating it. It is then important that the replicas receive the same inputs in the same order. This is known as the Replicated State Machine...
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Whitepapers
Multiple Target Tracking With RF Sensor Networks
February 11, 2013, 12:00am PST
RF sensor networks are wireless networks that can localize and track people (or targets) without needing them to carry or wear any electronic device. They use the change in the Received Signal...
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Distributed Scalable Multi-Target Tracking With a Wireless Sensor Network
April 23, 2009, 12:00am PDT
The authors propose a novel technique for tracking multiple co-dependently maneuvering targets using a wireless sensor network. They consider the scenario where the targets carry Radio Frequency...
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A Multi-Scale Spatial Model for RSS-Based Device-Free Localization
February 24, 2013, 12:00am PST
RSS-based Device-Free Localization (DFL) monitors changes in the Received Signal Strength (RSS) measured by a network of static wireless nodes to locate people without requiring them to carry or...
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Discovery and Resolution of Anomalies in Web Access Control Policies
December 30, 2012, 12:00am PST
Emerging computing technologies such as Web services, service-oriented architecture, and cloud computing has enabled them to perform business services more efficiently and effectively. However,...
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Key-Aggregate Cryptosystem for Scalable Data Sharing in Cloud Storage
March 25, 2013, 12:00am PDT
Data sharing is an important functionality in cloud storage. In this paper, the authors show how to securely, efficiently, and flexibly share data with others in cloud storage. They describe new...
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Decentralized Control of Transmission Rates in Energy-Critical Wireless Networks
January 31, 2013, 12:00am PST
In this paper, the authors discuss the decentralized optimization of delay and energy consumption in a multi-hop wireless network. The goal is to minimize the energy consumption of energy-critical...
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Self-Organization of a Mesh Hierarchy for Smart Grid Monitoring in Outage Scenarios
September 30, 2012, 12:00am PDT
Current hierarchical communication infrastructure in the smart grid is not robust for data collection from smart meters during outages. In this paper, the authors propose a self-organizing...
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Joint Timing and Channel Estimation for Bandlimited Long-Code-Based MC-DS-CDMA: A Low-Complexity Near-Optimal Algorithm and the CRLB
February 19, 2013, 12:00am PST
Joint Timing and Channel Estimation (JTCE) for bandlimited long-code-aided Multi-Carrier Direct-Sequence Code Division Multiple Access (MC-DS-CDMA) systems is investigated. The authors establish...
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Round-Robin Relaying With Diversity in Amplify-and-Forward Multi-Source Cooperative Communications
November 28, 2012, 12:00am PST
In this paper, a round-robin based relay protocol dubbed Round-Robin Relaying with Source Selection Protocol (R3SSP) is proposed to achieve full cooperative diversity in multisource cooperative...
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NEDAT- A Toolset to Design and Analyze Future Force Networks
September 11, 2008, 12:00am PDT
The Department of Defense has developed the overarching concept of Net-Centric Warfare (NCW) to incorporate the technological advancements of the information age into the U.S. military. Mobile Ad...
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Cost-Optimal Scheduling in Hybrid IaaS Clouds for Deadline Constrained Workloads
August 25, 2010, 12:00am PDT
With the recent emergence of public cloud offerings, surge computing - outsourcing tasks from an internal data center to a cloud provider in times of heavy load - has become more accessible to a...
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Automated Learning of Playout Scheduling Algorithms for Improving Perceptual Conversational Quality in Multi-Party VOIP
August 20, 2008, 12:00am PDT
In this paper, the authors propose four methods for equalizing the silence periods experienced by users in a multi-party VoIP conversation in order to improve their perceived conversational...
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