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Institute of Electrical & Electronic Engineers
(11333 results)-
Whitepapers
STOD-RP: A Spectrum-Tree Based On-Demand Routing Protocol for Multi-Hop Cognitive Radio Networks
October 29, 2008, 12:00am PDT
A unique challenge for routing in cognitive radio networks is the collaboration between the route selection and spectrum decision. To solve this problem, in this paper a Spectrum-Tree base...
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Whitepapers
A Column Generation Approach for Spectrum Allocation in Cognitive Wireless Mesh Network
October 29, 2008, 12:00am PDT
Cognitive Radio (CR) has the potential to substantially improve the system capacity and adaptability of Wireless Mesh Network (WMN). In this paper, the authors investigate the achievable...
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Whitepapers
Opportunistic Spectrum Access: Online Search of Optimality
October 29, 2008, 12:00am PDT
This paper presents an online tuning approach for the ad-hoc reinforcement learning algorithms which are used for solving the exploitation-exploration dilemma of the opportunistic spectrum access,...
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Whitepapers
Optimal Discovery of Bandwidth Opportunities in Spectrum Agile Networks
October 29, 2008, 12:00am PDT
This paper proposes an adaptive approach that allows wireless devices with multi-band capabilities to determine the optimal number of Spectrum Bands (SBs) to be explored so that its net benefit...
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Whitepapers
A Cooperative Relay Scheme for Secondary Communication in Cognitive Radio Networks
October 29, 2008, 12:00am PDT
In cognitive radio networks, Secondary Users (SUs) opportunistically exploit the spectrum unutilized by Primary Users (PUs). In this paper, the authors study the secondary communication where...
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Whitepapers
Automatic Determination of Spectral States for Cognitive Radio
October 29, 2008, 12:00am PDT
In this paper, the authors propose a method for automatically extracting distinct spectral states present in spectrum power measurements. The purpose is to gain information on the wireless...
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Whitepapers
Evaluation of the Concatenation of LDPC and RS Codes in Magnetic Recording Channel Using Field Programmable Gate Arrays
October 29, 2008, 12:00am PDT
Concatenations of inner Low-Density Parity-Check (LDPC) codes and outer Reed-Solomon (RS) codes were evaluated in magnetic recording channel models by simulations using Field Programmable Gate...
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Whitepapers
Distributed Detection of Primary Signals in Fading Channels for Cognitive Radio Networks
October 29, 2008, 12:00am PDT
In this paper, the authors investigate cooperative sensing schemes to identify primary signals in fading environment for Cognitive Radio (CR) networks employing energy detectors. They consider a...
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Whitepapers
Using Object Metadata to Detect and Tolerate Attacks in Object Storage Devices
October 29, 2008, 12:00am PDT
Storage based intrusion detection techniques have introduced an additional level of protection to interconnected systems and their running services. Such systems perform intrusion detection even...
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Whitepapers
Enhancements to IEEE 802.11 MAC to Avoid Packet Collisions
October 29, 2008, 12:00am PDT
The IEEE 802.11 WLAN standard specifies two different ways in which a wireless STAtion (STA) can gain access to the channel - distributed channel access where each STA can access channel in a...
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Whitepapers
Limited Feedback Beamforming Codebook Design for Dual-Polarized MIMO Channels
October 29, 2008, 12:00am PDT
Collocated dual-polarized Multiple-Input Multiple-Output (MIMO) antenna systems provide a cost-space efficient alternative to current MIMO antenna systems. A limited feedback beamforming technique...
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Whitepapers
A Lattice Precoding Scheme for Flat-Fading MIMO Channels Based on Eigenvalue Decomposition
October 29, 2008, 12:00am PDT
A novel Lattice Precoding scheme based on Eigenvalue Decomposition (EDLP) is proposed for single user Multiple-Input Multiple-Output (MIMO) communication systems transmitting over slowly-varying...
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Whitepapers
An Improved Tomlinson-Harashima Precoder Reducing Transmission Power
October 29, 2008, 12:00am PDT
Tomlinson-Harashima Precoder (THP) is an efficient interference pre-canceler, however, the transmission power is increased over the symbol power due to the modulo operation. In this paper, the...
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Whitepapers
Game Theoretic Solutions for Precoding Strategies over the Interference Channel
October 29, 2008, 12:00am PDT
In this paper, precoding strategies over interference channels are analyzed from a game-theoretic perspective. The Nash equilibrium and Nash bargaining solutions of precoding matrices, as the...
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Whitepapers
Hybrid Domain Compensation for Analog Impairments in OFDM Systems
October 29, 2008, 12:00am PDT
In Orthogonal Frequency Division Multiplexing (OFDM) systems with direct-conversion transceivers, transmission performance is severely degraded by analog impairments, typically, carrier frequency...
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Whitepapers
Selective Vector Perturbation Precoding and Peak to Average Power Ratio Reduction for OFDM Systems
October 29, 2008, 12:00am PDT
High Peak to Average Power Ratio (PAPR) is a serious drawback for Orthogonal Frequency Division Multiplexing (OFDM) system as it reduces the efficiency of high-power amplifiers commonly used in...
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Whitepapers
A Robust Timing Recovery Algorithm for OFDM Systems
October 29, 2008, 12:00am PDT
The authors propose a new robust timing recovery algorithm with small symbol timing jitter for Orthogonal Frequency-Division Multiplexing (OFDM) systems. The concept of coarse FFT window selection...
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Whitepapers
Performance and Design of an Impulse Noise Detector for OFDM Systems With Reed-Solomon Erasure-Decoding
October 29, 2008, 12:00am PDT
The authors develop an analytical framework to evaluate the probability-of-miss and probability-of-false-alarm performance of an Impulse Noise (IN) detection algorithm for Orthogonal...
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Whitepapers
Numerical Performance Evaluation of OFDM Systems Affected by Transmitter Nonlinearities, Phase Noise and Channel Estimation Errors
October 29, 2008, 12:00am PDT
In this paper, the authors present a numerical approach to evaluate the bit error rate and mutual information of OFDM links affected by transmitter nonlinearities, phase noise, channel estimation...
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Whitepapers
Adaptive Modulation for OFDM-Based Multiple Description Progressive Image Transmission
October 29, 2008, 12:00am PDT
This paper addresses the use of adaptive modulation in progressive image transmission with multiple description coding in conjunction with an Orthogonal Frequency Division Multiplexing (OFDM)...
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Whitepapers
Robustness Analysis of Source Localization Using Gaussianity Measure
October 29, 2008, 12:00am PDT
Now-a-days, the source localization has been widely applied for wireless sensor networks. The Gaussian mixture model has been adopted for Maximum-Likelihood (ML) source localization schemes....
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Whitepapers
Decision Fusion Over Noncoherent Fading Multiaccess Channels
October 29, 2008, 12:00am PDT
In this paper, the authors consider a situation where a number of remote sensors is linked to a decision fusion center by a non-coherent fading multi-access channel. Each sensor makes a binary...
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Whitepapers
Sufficient-Statistics Based Multiple Access Over Wireless Fading Channels
October 29, 2008, 12:00am PDT
In this paper, the authors study a communication scheme in which nodes transmit sufficient statistics of their observations over non-orthogonal medium access channels for distributed estimation....
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Whitepapers
A Second Order Statistics Based Algorithm for Blind Recognition of OFDM Based Systems
October 29, 2008, 12:00am PDT
An opportunistic radio is a radio able to detect the spectrum unused bands, and to adapt its transmission parameters in order to transmit within these free bands. An opportunistic terminal has...
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Whitepapers
Antenna Array Calibration Using Frequency Selection in OFDMA/TDD Systems
October 29, 2008, 12:00am PDT
This paper proposes a new antenna array calibration using frequency selection in OFDMA/TDD systems. In the proposed method, subbands or frequencies of good channel conditions are initially...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
An Efficient Near Blind Carrier Frequency Offset Estimation Scheme for MIMO-OFDM Systems
October 29, 2008, 12:00am PDT
A novel technique for the estimation of Carrier Frequency Offset (CFO) in Orthogonal Frequency Division Multiplexing (OFDM) based Multiple Input Multiple Output (MIMO) communication systems is...
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Whitepapers
Digital Baseband Compensation for Mobile SFBC-OFDM Systems With Receiver I/Q Imbalance
October 29, 2008, 12:00am PDT
In-phase and Quadrature-phase (I/Q) imbalance is a major performance-limiting impairment for direct-conversion Orthogonal Frequency Division Multiplexing (OFDM) transceivers. I/Q imbalance...
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Whitepapers
Multiuser Carrier Frequency Offset Estimation for OFDMA Uplink With Generalized Carrier Assignment Scheme
October 29, 2008, 12:00am PDT
In this paper, the authors develop a blind Carrier Frequency Offsets (CFOs) estimation algorithm for multiusers in the uplink of an Orthogonal Frequency-Division Multiple-Access (OFDMA) system,...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
Allocation of Feedback Bits Among Users in Broadcast MIMO Channels
October 29, 2008, 12:00am PDT
Given a constraint on the total amount of feedback overhead, the authors investigate the allocation of feedback bits (i.e., codebook sizes) among users in a limited feedback Zero Forcing...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
An Iterative Receiver for Distributed Multi-Input Multi-Output (MIMO) Flat-Fading Channels
October 29, 2008, 12:00am PDT
In this paper, the authors consider the problem of joint channel and frequency offset estimation, data detection in a flat-fading Multi-Input Multi-Output (MIMO) system. They assume that each pair...
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Whitepapers
Adaptive SSFE Near-ML MIMO Detector With Dynamic Search Range and 80-103Mbps Flexible Implementation
October 29, 2008, 12:00am PDT
In this paper, the authors will present a near-ML (Maximum Likelihood) MIMO (Multiple Input Multiple Output) detector explicitely optimized for parallel programmable baseband architectures, such...
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Whitepapers
A Multi-Core Sphere Decoder VLSI Architecture for MIMO Communications
October 29, 2008, 12:00am PDT
The sphere decoding algorithm finds applications in Multi-Input Multi-Output (MIMO) decoding, because it achieves near Maximum Likelihood (ML) detection performance with significantly reduced...
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Whitepapers
Multiuser MIMO E-SDM Systems: Performance Evaluation and Improvement in Time-Varying Fading Environments
October 29, 2008, 12:00am PDT
In the paper, performance of multiuser multiple-input multiple-output Eigenbeam-Space Division Multiplexing (ESDM) systems in the downlink transmission is evaluated in both uncorrelated and...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
Estimation of MIMO Channel Capacity From Phase-Noise Impaired Measurements
October 29, 2008, 12:00am PDT
Due to the significantly reduced cost and effort for system calibration Time-Division Multiplexing (TDM) is a commonly used technique to switch between the transmit and receive antennas in...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
Time-Varying FIR Equalization for MIMO Transmission Over Doubly Selective Channels
October 29, 2008, 12:00am PDT
In this paper, the authors propose time-varying FIR equalization techniques for Multiple-Input Multiple-Output (MIMO) transmission over doubly selective channels. The doubly selective channel is...
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Whitepapers
ISI-Free Cochannel Interference Whitening for Band limited Fading Channels
October 29, 2008, 12:00am PDT
The problem of cochannel interference mitigation using interference-plus-noise whitening receiver design in the presence of Inter-Symbol Interference (ISI) is considered. The effect of ISI on the...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
Optimal Channel Shortening Equalization for MIMO ISI Channels
October 29, 2008, 12:00am PDT
The authors consider the problem of channel shortening equalization to perform reduced complexity detection for MIMO channels with intersymbol interference and additive Gaussian noise. The problem...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
Analysis of A Novel Blind Decision-Feedback Interference Cancellation Framework
October 29, 2008, 12:00am PDT
Interference cancellation is one major multiuser detection strategy for suppressing interference effects and improving system performance. In this paper, a novel blind decision-feedback...
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Whitepapers
H-ARQ Based Non-Orthogonal Multiple Access With Successive Interference Cancellation
October 29, 2008, 12:00am PDT
In this paper, the authors consider Non-Orthogonal Multiple Access (NOMA) over block fading channels where the performance is limited by interference and fading. Re-transmission and interference...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
MIMO Receiver Design in the Presence of Radio Frequency Interference
October 29, 2008, 12:00am PDT
Multi-Input Multi-Output (MIMO) receivers have been designed and their communication performance analyzed under the assumption of additive Gaussian noise. Wireless transceivers, however, may be...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
Load Matrix Optimization in Mobile Cellular Networks
April 15, 2008, 12:00am PDT
Future mobile networks providing multitude of services with large range of QoS requirements has made the importance of Radio Resource Management (RRM) ever more significant. Traditional scheduling...
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Whitepapers
Theoretical Capacity and Outage Rate of OFDMA Cellular System with Fractional Frequency Reuse
April 15, 2008, 12:00am PDT
Employing Fractional Frequency Reuse (FFR) in OFDMA cellular systems is attracting a lot of attention since it offers large capacity and one-cell frequency reuse. However its performance under...
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Whitepapers
A Wireless Mesh Network-Based Platform for ITS
April 15, 2008, 12:00am PDT
Although efficient and safe transportation of people and goods is paramount transportation problems continue to soar. Traffic congestions are of the most visible of transportation problems in...
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Whitepapers
Resource Allocation Techniques for OFDMA-Based Decode-and-Forward Relaying Networks
April 15, 2008, 12:00am PDT
In this paper, the authors focus on the design of efficient resource allocation algorithms for a multihop cellular network, with Orthogonal Frequency Division Multiple Accesses (OFDMA) as downlink...
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Whitepapers
Extending Enterprise Architecture with Mobility
April 15, 2008, 12:00am PDT
This paper discusses the extension of the Enterprise Architecture (EA) with mobile technologies. The mobile technologies provide the modern business with benefits of location and time independence...
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Whitepapers
Dynamic Access Network Selection with QoS Parameters Estimation: A Step Closer to ABC
April 15, 2008, 12:00am PDT
Always Best Connected (ABC) services allow multimode mobile terminals to stay connected to the best available networks, at anytime according to user preferences. One of the key aspects in...
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Whitepapers
Boosting Video Capacity of IEEE 802.11n Through Multiple Receiver Frame Aggregation
April 15, 2008, 12:00am PDT
The technology based on the IEEE 802.11 standard has been hugely successful, and is evolving towards even higher speeds and richer features. In particular, the 802.11n amendment of the standard...
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Whitepapers
A Novel Approach for Realistic Emulation of Vehicle-2-X Communication Applications
April 15, 2008, 12:00am PDT
New applications in future intelligent transportation systems are to enhance both safety and traffic efficiency. Wireless vehicular communication is to provide the basis for the new Vehicle-2-X...
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Whitepapers
QoS Oriented Time and Frequency Domain Packet Schedulers for The UTRAN Long Term Evolution
April 15, 2008, 12:00am PDT
In this paper, the authors introduce Orthogonal Frequency Division Multiple Access (OFDMA) downlink general packet scheduling methods for throughput fairness control among users. The investigation...
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Whitepapers
Distributed Detection in OFDM Based Ad Hoc Overlay Systems
April 15, 2008, 12:00am PDT
Overlay systems are a feasible approach to increase the efficiency of spectrum use. An independent Secondary User (SU) system operates in the same frequency band as a Primary User (PU) system. In...
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Whitepapers
Performance Evaluation of a Relay-Based 4G Network Deployment with Combined SDMA/OFDMA and Resource Partitioning
April 15, 2008, 12:00am PDT
This paper presents a low-cost, low complexity deployment concept for a relay-based cellular broadband network. The concept is based on a combination of a multi-antenna OFDMA Base Station (BS) and...
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Whitepapers
On the Benefits of Relays in a Metropolitan Area Network
April 15, 2008, 12:00am PDT
The main motivation to deploy fixed wireless relays in a wireless communication system is to save costs while achieving a similar or better service level and coverage than with a base station only...
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Whitepapers
Analytic Evaluation of a Hybrid Broadcast-Unicast TV Offering
April 15, 2008, 12:00am PDT
Today mobile TV services in cellular spectrum are delivered over unicast radio bearers as offered by 3G technologies like WCDMA and HSDPA. Since unicast transmission does not scale very well if...
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Whitepapers
Performance of Uplink Fractional Power Control in UTRAN LTE
April 15, 2008, 12:00am PDT
UTRAN Long Term Evolution is currently being standardized in 3GPP with the aim of more than twice the capacity over High-Speed Packet Access. The chosen multiple access for uplink is Single...
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Whitepapers
Low Power Consumption Solutions for Instant Messaging on Mobile Devices
April 15, 2008, 12:00am PDT
Instant Messaging (IM) services enable real-time text and multimedia exchange and online presence awareness. Users typically log onto IM services persistently in order to discover available...
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Whitepapers
Improving SC-FDMA Performance by Turbo Equalization in UTRA LTE Uplink
April 15, 2008, 12:00am PDT
Turbo equalization is known as an advanced iterative equalization and decoding technique that allows to enhance the performance of the data transmission over a frequency selective fading channel....
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
Web Optimization in Real UMTS Networks with Channel Switching Mechanisms
April 15, 2008, 12:00am PDT
Web download performance is dramatically degraded in UMTS, resulting in perceived throughputs of around 25% of the expected bandwidth even in favorable conditions. The authors analyze the main...
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Whitepapers
Performance of WiMAX Networks Integrated in a Segment of Satellite Using Channel Reservation Mechanism
April 15, 2008, 12:00am PDT
Mobility issue and service continuity represent important challenges for next generation networks. The integration of a satellite segment within a terrestrial network (especially WiMAX) has...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
Spectral Correlation-Based Multi-Antenna Spectrum Sensing Technique
March 11, 2008, 12:00am PDT
To meet the challenges in sensing the spectrum in a reliable and timely manner, an approach of multi-antenna spectrum sensing based on spectral correlation property is proposed in this paper....
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Whitepapers
Energy-Efficient Joint Power and Rate Control via Pricing in Wireless Data Networks
March 11, 2008, 12:00am PDT
Next Generation wireless networks are evolving towards all-data system which are expected to support a variety of application services with diverse transmission rates. Meanwhile, since most of the...
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Whitepapers
Optimal Voice Admission Control Performance under Soft Vertical Handoff in Loosely Coupled 3G/WLAN Networks
March 11, 2008, 12:00am PDT
Low cost WLAN networks are very likely to be loosely coupled to high cost 3G networks in order to provide the 3G subscribers with an extended WLAN capacity and the WLAN subscribers with the 3G...
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Whitepapers
An Introduction to the Cognitive Concept as a Cost-Effective Method for Network Performance Management
March 11, 2008, 12:00am PDT
A successful journey beyond 3G towards 4G Mobile is ensured to a large extent by creating cost-effective solutions for ubiquitous converged voice and data networks. This could be achieved through...
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Whitepapers
Subchannel-Division Adaptive Resource Allocation Technique for Cooperative Relay-Based MIMO/OFDM Wireless Communication Systems
March 11, 2008, 12:00am PDT
In this paper, the authors propose cooperative division relay based allocation technique jointly with adaptive bit/power loading for Multiple-Input-Multiple-Output/Orthogonal Frequency Division...
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Whitepapers
Saturated Throughput of Burst Mode PCA with Hard DRPs in WiMedia MAC
March 11, 2008, 12:00am PDT
An analytical formulation of the saturated throughput of Burst Mode Prioritized Contention Access (PCA) with Hard Distributed Reservation Protocols (DRPs) and Beacon Period (BP) in WiMedia MAC is...
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Whitepapers
A Real-Time Algorithm for Long Range Signal Strength Prediction in Wireless Networks
March 11, 2008, 12:00am PDT
Prediction of rapidly time variant fading channel conditions enables adaptive data transmission in wireless systems, which in turn improves the quality of service for end users and reduces the...
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Whitepapers
A Performance Comparison of Routing Protocols for Maritime Wireless Mesh Networks
March 11, 2008, 12:00am PDT
The authors envisage coverage extension of the high bit rate terrestrial communication networks to the ships to reduce the cost in maritime communications. The coverage extension is achieved by...
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Whitepapers
Multichannel Wormhole Switching vs. CSMA/CA for Wireless Mesh Networking
March 11, 2008, 12:00am PDT
This paper presents a method for improving the performance of Wireless Mesh Networks (WMN) through the use of multichannel wormhole switching. Current WMNs based on contention-based Medium Access...
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Whitepapers
Towards an Architecture for Mobility Management and Resource Control
March 11, 2008, 12:00am PDT
In 4G networks, various wireless access technologies will be integrated into a heterogeneous network based on an IP core network infrastructure. Thus, numerous works focus on mobility and vertical...
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Whitepapers
Repeating or Relaying in Wireless Systems
March 11, 2008, 12:00am PDT
In this paper, the authors investigate delay diversity in Ricean fading channels implied by repeaters as a simple form of relay. They will outline the impact in broadcast and in mobile radio...
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Whitepapers
Effect of Frame Aggregation on the Throughput Performance of IEEE 802.11n
March 11, 2008, 12:00am PDT
The IEEE 802.11n standard aims at providing a data transmission rate of up to 600 Mbps. The frame aggregation techniques of IEEE 802.11n MAC layer play an important role in the enhancement of...
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Whitepapers
Uplink-Downlink SINR Duality via Lagrange Duality
March 11, 2008, 12:00am PDT
The uplink-downlink SINR duality theorem is key tools which simplify substantially the problem of joint design of the linear transmit and receive beam formers in Multiple-Input Multiple-Output...
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Whitepapers
Reduced-Complexity Recursive MMSE Channel Estimator for the Wireless OFDM Systems
March 11, 2008, 12:00am PDT
An accurate estimate of the Channel Frequency Response (CFR) needed for OFDM equalization can be obtained using the linear Minimum Mean Square Error (MMSE) algorithm. However, for an optimal...
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Whitepapers
Security Concept for Distributed Service Execution Environments
March 11, 2008, 12:00am PDT
This paper presents a concept to securely execute services on a distributed execution environment. The execution environment (SSEE), offers interfaces in terms of Web Services (WS). Using these WS...
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Whitepapers
QoS Support Over UWB Mesh Networks
March 11, 2008, 12:00am PDT
Streaming and multimedia services are key applications in UWB-based high-rate short-range Wireless Personal Area Networks (WPANs). In this paper, the authors study how to support the Quality of...
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Whitepapers
Alternate Transmission Relaying Schemes for MIMO Wireless Networks
March 11, 2008, 12:00am PDT
Enormous gains of using multiple antennas at both the transmitter and the receiver known as Multiple-Input Multiple-Output (MIMO) in wireless communication system have been predicted. Especially,...
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Whitepapers
Linear Dispersion Codes for MIMO Channels with Limited Feedback
March 11, 2008, 12:00am PDT
In this paper, the authors propose Linear Dispersion Codes (LDCs) for Multiple-Input Multiple-Output (MIMO) channels with a prescribed amount of feedback. The proposed scheme selects the LDC from...
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Whitepapers
Performance of a WSN in the Presence of Channel Variations and Interference
March 11, 2008, 12:00am PDT
The broadcast capacity of a Wireless Sensor Network (WSN) is defined as the maximum rate at which the network may generate messages intended for distribution to the entire network. Broadcast...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
Performance Comparison of Uplink WLANs with Single-User and Multi-User MIMO Schemes
March 11, 2008, 12:00am PDT
In this paper, the authors compare the performance of Wireless Local Area Networks (WLANs) with Single-User MIMO (SU-MIMO) and Multi-User MIMO (MU-MIMO) in terms of collision probability, average...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
Adaptive Cross Layer Scheduling with Flow Multiplexing
March 11, 2008, 12:00am PDT
Wireless communications has emerged as one of the largest sectors of the telecommunications industry and one of the most promising growth areas into the next decade. To meet the challenges of...
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Whitepapers
A Cross-Layer Approach for Frame Transmissions of MPEG-4 Over the IEEE 802.11e Wireless Local Area Networks
March 11, 2008, 12:00am PDT
In this paper, the authors study MPEG-4 transmissions over the IEEE 802.11e wireless local area networks (WLANs). They provided a simulation of MPEG-4 using OPNET over WLANs, and simulation...
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