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Institute of Electrical & Electronic Engineers
(11511 results)-
Whitepapers
Optimization of Linear Recursive Queries in SQL
January 1, 2012, 12:00am PST
Recursion is a fundamental computation mechanism which has been incorporated into SQL. This work focuses on the optimization of linear recursive queries in SQL. Query optimization is studied with...
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Whitepapers
Statistical Model Computation With UDFs
January 1, 2012, 12:00am PST
Statistical models are generally computed outside a DBMS due to their mathematical complexity. The authors introduce techniques to efficiently compute fundamental statistical models inside a DBMS...
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Integrating K-Means Clustering With a Relational DBMS Using SQL
January 1, 2012, 12:00am PST
Integrating data mining algorithms with a relational DBMS is an important problem for database programmers. The authors introduce three SQL implementations of the popular K-means clustering...
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Spatio-Temporal Joins on Symbolic Indoor Tracking Data
March 16, 2011, 12:00am PDT
To facilitate a variety of applications, positioning systems are deployed in indoor settings. For example, Bluetooth and RFID positioning are deployed in airports to support real-time monitoring...
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Whitepapers
Graph Model Based Indoor Tracking
August 1, 2009, 12:00am PDT
The tracking of the locations of moving objects in large indoor spaces is important, as it enables a range of applications related to, e.g., security and indoor navigation and guidance. This paper...
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Whitepapers
BER Analysis of OFDM Systems Impaired by Phase Noise in Frequency-Selective Rayleigh Fading Channels
October 29, 2008, 12:00am PDT
In this paper, the authors study the effect of finite-power, Phase-Locked-Loop (PLL) based phase noise on the Bit-Error-Rate (BER) of Orthogonal Frequency Division Multiplexing (OFDM) systems in...
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Whitepapers
Maximum Likelihood Estimation and Correction of Carrier Frequency Offset in OFCDM Systems
October 29, 2008, 12:00am PDT
In this paper, a Carrier Frequency Offset (CFO) correction scheme is proposed for a downlink Variable Spreading Factor (VSF) OFCDM system based on the maximum likelihood principle. The authors...
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Whitepapers
A Blind Maximum-SINR Synchronization Technique for OFDM Systems
October 29, 2008, 12:00am PDT
This paper presents a blind synchronizer for Orthogonal Frequency-Division Multiplexing (OFDM) systems based on Signal-to-Interference-and-Noise-Ratio (SINR) maximization. Due to the incurred...
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Whitepapers
Doppler Spread Estimation by Subspace Tracking for OFDM Systems
October 29, 2008, 12:00am PDT
In this paper, a novel maximum Doppler spread estimation algorithm is presented for OFDM systems with the comb-type pilot pattern. The least squared estimated Channel Frequency Responses (CFR's)...
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Whitepapers
Design and Analysis of Channel Estimation for Multi-Band OFDM-UWB Systems
October 29, 2008, 12:00am PDT
This paper presents an efficient channel estimation scheme for multi-band orthogonal frequency division multiplexing based ultra-wideband communications. The scheme is based on a simple...
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Whitepapers
Spectral Sculpting for OFDM Based Opportunistic Spectrum Access by Extended Active Interference Cancellation
October 29, 2008, 12:00am PDT
To enable coexistence between an OFDM based opportunistic spectrum access system and a primary user, the authors proposed two novel methods called EAIC (Extended Active Interference Cancellation)...
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Whitepapers
Performance Enhancement of Random Unitary Beamforming Based Multiuser MIMO Systems With Optimum Combining
October 29, 2008, 12:00am PDT
Random Unitary Beamforming (RUB) is an attractive low-complexity transmission scheme for multiuser MIMO broadcast channel. When there are a moderate number of users in the system, the sum rate...
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Whitepapers
MIMO Multichannel Beamforming: Analysis in the Presence of Rayleigh Fading, Unbalanced Interference and Noise
October 29, 2008, 12:00am PDT
This paper studies the performance of MIMO multichannel beamforming systems in the presence of unequal-power co-channel interference and noise. The authors present exact expressions for the symbol...
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Whitepapers
MIMO Multiple Access Channels With Noisy Channel Estimation and Partial CSI Feedback
October 29, 2008, 12:00am PDT
The authors consider correlated MIMO multiple access channels with block fading, where each block is divided into training and data transmission phases. They find the channel estimation and data...
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Whitepapers
Thresholded Interference Cancellation Algorithm for the LTE Uplink Multiuser MIMO
October 29, 2008, 12:00am PDT
Single Carrier Frequency Division Multiple Access (SC-FDMA) is adopted as uplink multiple access scheme in 3G Long-Term Evolution (LTE). Combining SC-FDMA with MIMO (Multiple-Input...
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Whitepapers
Ergodic Capacity of Multi-Hop Wireless Relaying Systems in Rayleigh Fading
October 29, 2008, 12:00am PDT
The ergodic capacity in Rayleigh fading of multi-hop wireless transmission systems employing either amplify-and-forward relaying or decode-and-forward relaying is studied, assuming channel state...
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Whitepapers
Level-Crossing Rate and Average Duration of Fades of the Envelope of Mobile-to-Mobile Fading Channels in Cooperative Networks Under Line-of-Sight Conditions
October 29, 2008, 12:00am PDT
This paper studies the fading behavior of Mobile-To-Mobile (M2M) fading channels in relay-based cooperative networks under Line-Of-Sight (LOS) conditions. Here, the authors assume that LOS...
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Whitepapers
Power Allocation for Cognitive Radios Based on Primary User Activity in an OFDM System
October 29, 2008, 12:00am PDT
Efficient and reliable power allocation algorithm in Cognitive Radio (CR) networks is a challenging problem. Traditional water-filling algorithm is inefficient for CR networks due to the...
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Whitepapers
Resource Sharing in Cognitive Radio Systems: Outage Capacity and Power Allocation Under Soft Sensing
October 29, 2008, 12:00am PDT
Cognitive radio technology offers tremendous potential to improve the utilization of the radio spectrum by efficiently reusing and sharing the licensed spectrum bands, as long as the interference...
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Whitepapers
Game Theoretic Approach to Spectrum Allocation for Weak Interference Systems
October 29, 2008, 12:00am PDT
A scenario consisting of two transmitter-receiver pairs coexisting in the same area and communicating using the same portion of the spectrum is considered. Decentralized coding strategies are...
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Whitepapers
Cooperative and Non-Cooperative Aloha Games With Channel Capture
October 29, 2008, 12:00am PDT
Game theory has been a useful tool for the analysis of random-access based wireless networks due to their decentralized operations. This paper studies one of the most widely used random access...
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Whitepapers
Weighted Sum Rate Optimization of Multicell Cognitive Radio Networks
October 29, 2008, 12:00am PDT
In this paper, the authors study the weighted sum rate maximization of multicell cellular Cognitive Radio Networks (CRNs) which are overlaid with multicell Primary Radio Networks (PRNs). They...
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Whitepapers
Efficient Ergodic Discrete Loading for OFDM Systems
October 29, 2008, 12:00am PDT
The authors consider the discrete bit loading problem in OFDM systems with objective and constraints in terms of ergodic rates and powers. This differs from almost all existing techniques, which...
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Whitepapers
Joint Power Loading of Data and Pilots in OFDM Using Imperfect Channel State Information at the Transmitter
October 29, 2008, 12:00am PDT
The search for optimality in the design of channel precoders and training symbols in block processing communication systems is one of paramount importance. Finding the best tradeoff in terms of...
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Whitepapers
Novel Low-Complexity SLM Schemes for PAPR Reduction in OFDM Systems
October 29, 2008, 12:00am PDT
The SeLected Mapping (SLM) is a major scheme for Peak-to-Average Power Ratio (PAPR) reduction in Orthogonal Frequency Division Multiplexing (OFDM) systems. It has been shown that the complexity of...
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Whitepapers
BER Analysis for Asymmetric OFDM Systems
October 29, 2008, 12:00am PDT
To alleviate the high Peak-to-Average Power Ratio (PAPR) and sensitivity to Carrier Frequency Offset (CFO) problems, an Asymmetric OFDM (A-OFDM) system has been recently proposed. In this paper,...
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Whitepapers
Performance of BICM-OFDM Systems in Non-Gaussian Noise and Interference
October 29, 2008, 12:00am PDT
In this paper, the authors present a general mathematical framework for performance analysis of systems employing Bit - Interleaved Coded Modulation (BICM) and Orthogonal Frequency Division...
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Whitepapers
Capacity Analysis for OFDM Systems With Transceiver I/Q Imbalance
October 29, 2008, 12:00am PDT
OFDM systems have gained utmost importance for wireless communications requiring ever higher data rates. The maximum data rate that can be achieved is, however, limited by the wireless...
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Whitepapers
The Impact of Imperfect Channel State Information on QRD-Based Precoded MIMO-OFDM System
October 29, 2008, 12:00am PDT
A new closed-loop precoding method has been proposed for MIMO-OFDM systems with limited feedback by using the QR decomposition to the time-domain channel impulse response matrix. In contrast to...
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Whitepapers
A Supervised Learning Approach to Adaptation in Practical MIMO-OFDM Wireless Systems
October 29, 2008, 12:00am PDT
MIMO-OFDM wireless systems require adaptive modulation and coding based on Channel State Information (CSI) to maximize throughput in changing wireless channels. Traditional adaptive modulation and...
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Whitepapers
3G LTE Simulations Using Measured MIMO Channels
October 29, 2008, 12:00am PDT
In this paper, the authors present downlink simulation results for a realistic implementation of the LTE (Long Term Evolution) 3G standard. In contrast to previous studies, actual measured...
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Whitepapers
Throughput/Delay Measurements of Limited Feedback Beamforming in Indoor Wireless Networks
October 29, 2008, 12:00am PDT
This paper investigates the tradeoff between throughput and feedback delay of limited feedback beamforming in indoor wireless channels with a practical MIMO-OFDM prototype. Past descriptions of...
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Whitepapers
Effect of Channel Estimation Errors in MIMO-OFDM Systems With Phase Noise Compensation
October 29, 2008, 12:00am PDT
In this paper, the effect of phase noise in multiple-input-multiple-output systems employing orthogonal frequency division multiplexing is considered in a realistic scenario where channel...
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Whitepapers
Location-Aware Cooperative Communications Utilizing Linear Network Coding
October 29, 2008, 12:00am PDT
Cooperative communication can be used to reduce the transmit power of distant mobile units, compared to conventional direct transmission, given the same quality-of-service. However, imposing the...
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Whitepapers
Novel Rateless Coded Selection Cooperation in Dual-Hop Relaying Systems
October 29, 2008, 12:00am PDT
Selection cooperation is proposed for rateless coded relaying by developing a novel low-complexity protocol that exploits all source-destination, source-relay, and relay-destination link qualities...
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Whitepapers
Enhanced Bidirectional Relaying Schemes for Multi-Hop Communications
October 29, 2008, 12:00am PDT
This paper focuses on bidirectional relaying schemes for multi-hop communications. For a two hop communication system, Traditional 4-step Bidirectional Relaying (TBR) method allocates 4 slots,...
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Whitepapers
A Two-Dimensional Markov Model for Cross-Layer Design in AMC/ARQ-Based Wireless Networks
October 29, 2008, 12:00am PDT
Now-a-days, there are lots of research efforts focusing on cross-layer designs combining Adaptive Modulation and Coding (AMC) with an Automatic Repeat reQuest (ARQ) protocol. One of the main...
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Whitepapers
Joint Methods of Cell Searching and DoA Estimation for a Mobile Relay Station With Multiple Antennas
October 29, 2008, 12:00am PDT
In this paper, a Mobile Relay Station (MRS) for vehicles with beamforming antennas is considered to increase the reliability of transmission link, especially for the MRS at cell boundary. Joint...
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Whitepapers
Energy Efficient Estimation of Gaussian Sources Over Inhomogeneous Gaussian MAC Channels
October 29, 2008, 12:00am PDT
In this paper, the authors first provide a Joint Source and Channel Coding (JSCC) approach in estimating Gaussian sources over Gaussian MAC channels, as well as its sufficient and necessary...
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Whitepapers
An Efficient Privacy-Preserving Scheme for Wireless Link Layer Security
October 29, 2008, 12:00am PDT
In this paper, the authors propose an efficient privacy-preserving scheme for secure packet transmission at wireless link layer. The proposed scheme is constructed by using hash values in reverse...
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Whitepapers
A Payload-Dropping CSMA/CA Protocol for Improving Spatial Reuse of Wireless Local and Personal Area Networks
March 11, 2008, 12:00am PDT
Despite being well out of the Physical layer interference range, cells of CSMA/CA-based wireless networks suffer unnecessary throughput degradation when they are within the carrier sensing range....
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Whitepapers
Low Complexity Utility Based Resource Allocation for 802.16 OFDMA Systems
March 11, 2008, 12:00am PDT
A utility based resource allocation scheme is investigated for improving system performance of 802.16 OFDMA systems supporting a mix of multi-media traffic types. The authors show that a utility...
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Whitepapers
User-Centric Optimum Radio Access Selection in Heterogeneous Wireless Networks Based on Neural Network Dynamics
March 11, 2008, 12:00am PDT
The authors propose an autonomous and decentralized optimization method for heterogeneous wireless networks, in which a huge number of mobile terminals with multiple different air interfaces...
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Whitepapers
On the Ranging and Scheduling of Data Traffic in OFDMA Mobile Environments
March 11, 2008, 12:00am PDT
In the last years the Wireless Metropolitan Area Networks have increased their popularity and attracted the interest of the most important research groups all over the world. Several standards...
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Whitepapers
Network Coding With Linear MIMO Pre-Equalizer Using Modulo in Two-Way Channel
March 11, 2008, 12:00am PDT
Previous papers regard the signals from other users as interferences to be avoided in wireless ad-hoc network systems (e.g., IEEE 802.11/16). However, if the purpose of ad-hoc communications is...
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Whitepapers
Distributed Space-Time Trellis Code for Asynchronous MIMO Relays Over Frequency-Selective Channels
March 11, 2008, 12:00am PDT
In most cooperative communications works, perfect synchronization among relay nodes is assumed. However, this assumption is not realistic due to the distributed nature of each relay node. In this...
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Whitepapers
Supporting Uncompressed HD Video Streaming Without retransmissions Over 60GHz Wireless Networks
March 11, 2008, 12:00am PDT
Uncompressed HD (High-Definition) video delivery over Wireless Personal Area Networks (WPANs) is a challenging problem because of the limited bandwidth and variations in channel. The most straight...
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Whitepapers
QoS Architecture in Ad Hoc Networks: Effects of Shadow Classes and ECN to Regulate the Load
March 11, 2008, 12:00am PDT
The authors propose and analyze an augmented DiffServ architecture for ad hoc networks. A scheme based on shadow classes and ECN is used to control the load. By including ECN they are able to...
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Whitepapers
Evaluating of Capacities in TD-SCDMA Systems When Employing Smart Antenna and Multi-User Detection Techniques
March 11, 2008, 12:00am PDT
In TD-SCDMA systems, the Multi-User Detection (MUD) and adaptive smart antenna techniques are adopted in both uplink and downlink. Considering the complexity of cancelling inter-cell interference,...
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Adaptive MIMO Decision Feedback Reduced-Rank Equalization Based on Joint Iterative Optimization of Adaptive RLS Estimation Algorithms
March 11, 2008, 12:00am PDT
This paper presents a novel adaptive reducedrank Multi-Input-Multi-Output (MIMO) decision feedback equalization structure based on joint iterative optimization of adaptive estimators. The novel...
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Whitepapers
Distributed Cyclic Spectrum Feature-Based Modulation Classification
March 11, 2008, 12:00am PDT
Automatic Modulation Classification (AMC) is a very important process for any receiver that has no, or limited, knowledge of the modulation scheme of the received signal. In addition to military...
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Whitepapers
A Generic Analytical Model of Packet Combining in Wireless Sensor Networks
March 11, 2008, 12:00am PDT
Simple Packet Combining (SPaC) is a recently proposed novel error-correction scheme for wireless sensor networks, whose excellent performance in noisy wireless transmissions was illustrated mainly...
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Downlink Scheduling with Probabilistic Guarantees on Short-Term Average Throughputs
March 11, 2008, 12:00am PDT
The authors consider the problem of scheduling multiple transmissions on the downlink of a wireless network with probabilistic guarantees on users' short-term average throughputs. Many interactive...
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Whitepapers
Multidimensional Scaling Algorithm for Mobile Location Based on Hybrid SADOA/TOA Measurement
March 11, 2008, 12:00am PDT
The mobile location in wireless communication system becomes a popular issue in recent years. It is commonly used in emergency services, roadside assistance, billing, navigation, psychophysics,...
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Hop-by-Hop Routing Strategy for Multihop Decode-and-Forward Cooperative Networks
March 11, 2008, 12:00am PDT
In this paper, focusing on multihop decodes- and forward cooperative networks, a hop-by-hop routing strategy are designed to optimize the end-to-end outage performance when only knowledge about...
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Performance Analysis Framework and Vertical Handover Triggering Algorithms for Voice Over WLAN/Cellular Network
March 11, 2008, 12:00am PDT
The development of handheld User Equipments (UE) capable of operating over both cellular networks and Wireless Local Area Networks (WLAN) is an important step towards the evolution of...
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Distributed Multichannel Power Allocation Algorithm for Spectrum Sharing Cognitive Radio Networks
March 11, 2008, 12:00am PDT
In this paper, the authors study the distributed MultiChannel Power Allocation (MCPA) problem for the spectrum sharing Cognitive Radio Networks (CRNs), where secondary transceiver pairs share the...
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Whitepapers
Interference Coordination vs. Interference Randomization in Multicell 3GPP LTE System
March 11, 2008, 12:00am PDT
In this paper the authors consider a multi cell and multiantenna E-UTRA system as conforming to 3GPP recommendation. Focusing on the downlink, the system performance is severely hampered by the...
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Directional Dependence of Large Scale Parameters in Wireless Channel Models
March 11, 2008, 12:00am PDT
In this paper the autocorrelation properties of shadow fading and angle spread at both the Base Station (BS) and at the Mobile Station (MS) are analyzed using urban macro cellular measurement...
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Whitepapers
Performance Improvement for Multichannel HARQ Protocol in Next Generation WiMAX System
March 11, 2008, 12:00am PDT
Hybrid Automatic Repeat-reQuest (HARQ) is critical to an IEEE 802.16e OFDMA network, as it can significantly improve the reliability of wireless link. However, as revealed by the authors'...
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History-Based Adaptive Modulation for a Downlink Multicast Channel in OFDMA systems
March 11, 2008, 12:00am PDT
In this paper the authors investigated the adaptive modulation strategies for Multicast service in orthogonal frequency division multiple access systems. They defined a Reward function as the...
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Whitepapers
Sum Rate Maximization of MIMO Broadcast Channels with Coordination of Base Stations
March 11, 2008, 12:00am PDT
The authors consider cooperative downlink transmission in multiuser, multi-cell and multiple-antenna cellular networks. Recently, it has been shown that multi-base coordinated transmission has...
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A Layered Approach to Modelling and Design of Cross-Layer Protocols in Ad-Hoc Wireless Networks
March 11, 2008, 12:00am PDT
In the emerging context of wireless (mobile) ad-hoc networks, cross-layer design has been proposed in recent years to pursue joint optimization at various layers. Modifications to the OSI...
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Whitepapers
One-Hop vs. Two-Hop Routing in Simple Networks with Fading: An Outage Probability Analysis Addressing Spectral Efficiency
March 11, 2008, 12:00am PDT
This paper compares one-hop and two-hop routing in a simple three node network consisting of two mobiles and a base station. The channel model assumes additive white Gaussian noise, attenuation...
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A Fragmentation-Based Data Collision Free MAC Protocol with Power Control for Wireless Ad Hoc Networks
March 11, 2008, 12:00am PDT
Resolving hidden terminal problem is one of the major responsibilities in designing MAC protocols for wireless ad hoc networks. The paper proposes a fragmentation-based MAC protocol with power...
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Non-Unitary Codebook Based Precoding Scheme for Multi-User MIMO with Limited Feedback
March 11, 2008, 12:00am PDT
In this paper, the authors propose a non-unitary codebook based precoding scheme for Multi-User MIMO (MU-MIMO) downlink transmission with limited feedback. The proposed MUMIMO scheme will perform...
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IEEE 802.11 DCF PSM Model and a Novel Downlink Access Scheme
March 11, 2008, 12:00am PDT
In this paper, the authors focus on the Markov model of IEEE 802.11 distributed coordination function with power saving mode. The throughput evaluation is based on the model, with the comparison...
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REACH: A Roaming-Enabled Architecture for Multi-Layer Capturing
March 11, 2008, 12:00am PDT
Modern mobile PCs have different kinds of network access technologies, such as wire-based interfaces (Ethernet) or wireless adapters (IEEE 802.11 WLAN, GPRS/GSM or UMTS). Ongoing research deals...
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Whitepapers
A Linear Programming Solution to Subcarrier, Bit and Power Allocation for Multicell OFDMA Systems
March 11, 2008, 12:00am PDT
Bit-loaded Orthogonal Frequency Division Multiplexing (OFDM) with convolutional coding is a powerful technique for transmission over quasi-static frequency-selective fading channels. Motivated by...
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Error Rate Analysis for Bit-Loaded Coded OFDM
March 11, 2008, 12:00am PDT
Bit-loaded Orthogonal Frequency Division Multiplexing (OFDM) with convolutional coding is a powerful technique for transmission over quasi-static frequency-selective fading channels. Motivated by...
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Widest Spanning Tree for Multi-Channel Multi-Interface Wireless Mesh Networks
March 11, 2008, 12:00am PDT
Efficient broadcast schemes are essential in Wireless Mesh Networks (WMNs) for minimizing the content update time. In this paper, the authors consider the widest spanning tree problem in a...
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Multicast Multiuser ARQ
March 11, 2008, 12:00am PDT
In this paper, multiuser ARQ is extended to multicasting. The core idea is that the sender, based on feedback from users regarding successfully received transmissions, adapts code weights for data...
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Toward Mobility and Multihoming Unification The SHIM6 Protocol: A Case Study
March 11, 2008, 12:00am PDT
Multihoming and mobility in IPv6 are usually considered as two disjoints concepts. This has lead to the development of the two protocols family separately. However, the new IPv6 terminals are most...
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An Opportunistic MAC in Multichannel Multiradio Wireless Ad Hoc Networks
March 11, 2008, 12:00am PDT
Opportunistic scheduling has been known as one of the possible ways of exploiting multi-user diversity, which comes from the time-varying propagation characteristics and broadcast nature of...
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Robust Transmission for Multiuser MIMO Downlink Systems with Imperfect CSIT
March 11, 2008, 12:00am PDT
The performance of multiuser MIMO (MU-MIMO) downlink systems with precoding and decoding method by minimizing the Total Mean Square Error (TMSE) of all data streams of all users (T-MMSE) depends...
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Spectral Efficiency Enhancement Techniques for Multicarrier On-Off Keying Transmission
March 11, 2008, 12:00am PDT
Amongst the advantages of Multicarrier On-Off Keying (MOOK) is the simplicity of its transmitter-receiver pair and inherent good performance in noisy channels which make it a popular choice for...
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Whitepapers
Evaluating MPEG-4 AVC Video Streaming over IEEE 802.11 Wireless Distribution System
March 11, 2008, 12:00am PDT
The high cost of rewiring existing houses with Ethernet to support broadband home networks has motivated consumers and service providers for "No-new-wires" and "Nowires" technologies. IEEE 802.11...
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Whitepapers
Channel-Dependent Scheduling of an Uplink SC-FDMA System with Imperfect Channel Information
March 11, 2008, 12:00am PDT
Channel-Dependent Scheduling (CDS) can increase the data throughput of a cellular system by exploiting multi-user diversity and frequency selectivity in the channel. In this paper, the authors...
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Coexistence Empirical Study and Analytical Model for Low-Rate WPAN and IEEE 802.11b
March 11, 2008, 12:00am PDT
The IEEE 802.11 and Low Rate WPAN (LR-WPAN) wireless networks can provide complimentary services and are likely to be installed within the same environments. Coexistence between the networks would...
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Whitepapers
On the Impact of Mobility and Joint RRM Policies on a Cooperative WiMAX/HSDPA Network
March 11, 2008, 12:00am PDT
In this paper, the authors develop a generic Markovian model to study the dynamics of data service in a multi-cell context, and apply it to cells served by HSDPA and WiMAX access networks. They...
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