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Institute of Electrical & Electronic Engineers
(11541 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 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...
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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...
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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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Low Complexity Transceiver Scheme for D-STTD OFDM System with Antenna Shuffling
March 11, 2008, 12:00am PDT
In this paper, the authors study low complexity transceiver for Double Space Time Transmit Diversity (D-STTD) and Orthogonal Frequency Division Multiplexing (OFDM) system with antenna shuffling....
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Whitepapers
Aggregate Information Efficiency and Packet Delay in Wireless Ad Hoc Networks
March 11, 2008, 12:00am PDT
In this paper, the authors evaluate the effects of modulation and coding schemes on the performance of ad hoc networks. The analysis is based on analytical expressions derived for the aggregate...
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Improving End-to-End Performance of Wireless Mesh Networks Through Smart Association
March 11, 2008, 12:00am PDT
In a wireless mesh network, a client station needs to associate with a mesh access point for network access. Conventional association mechanisms assume a high-speed backhaul and only the access...
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Iterative Turbo MMSE Successive Parallel Arbitrated Decision Feedback Detectors for DS-CDMA Systems
March 11, 2008, 12:00am PDT
In this paper, the authors propose iterative turbo Minimum Mean Squared Error (MMSE) successive parallel arbitrated Decision Feedback (DF) receivers for Direct Sequence Code Division Multiple...
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Whitepapers
Experimental BER Performance Evolution of Equalizations and Matched Filter Bounds for Single-Carrier WiMax Radio in 3.5 GHz
March 11, 2008, 12:00am PDT
This paper presents an experimental evaluation of Bit Error Rate (BER) performances for adaptive training algorithms and obtaining Matched Filter Bound in real-time WiMax (3.5GHz) radio channels....
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Scheduled Mesh Access Mechanism for an IEEE 802.11 Mesh Network
March 11, 2008, 12:00am PDT
One of the key issues for an IEEE 802.11-based mesh network is the effectiveness of its distributed listen-before transmit media access control approach. In this paper, the authors proposed one...
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QoS Aware Access Point Selection for Pre-Load-Balancing in Multi-BSSs WLAN
March 11, 2008, 12:00am PDT
This paper presents an AP selection strategy in the office environment covered by WLAN. While most of the selection metrics balances the active load among neighboring BSSs, the quality of voice...
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Whitepapers
Solar Powered WLAN Mesh Network Provisioning for Temporary Deployments
March 11, 2008, 12:00am PDT
WLAN mesh networks are often installed to provide wireless coverage for temporary events. In many of these cases, the WLAN mesh nodes can be operated using an energy sustainable source such as...
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Whitepapers
Impact of Limited Feedback on the Performance of MIMO Macrodiversity Transmission
March 11, 2008, 12:00am PDT
In this paper, the authors study the performance of the multiple-input multiple-output macrodiversity transmission with limited feedback. The downlink scenario, where multiple transmitters serve...
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Sum-Rate Analysis of MIMO Broadcast Channel with Random Unitary Beamforming
March 11, 2008, 12:00am PDT
In this paper, the authors present the exact sum-rate analysis of the multiuser MIMO system with Random Unitary Beam forming (RUB). Specifically, with the derived statistics of ordered beam signal...
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Whitepapers
Linear Multiuser Transceivers: Robustness Via Worst Scenario MSE Approach
March 11, 2008, 12:00am PDT
The authors consider the design of linear transceivers for multiuser communication systems in the presence of uncertain Channel State Information (CSI), with an emphasis on the downlink. They...
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Semi-Orthogonal Relay Selection and Beamforming for Amplify-and-Forward MIMO Relay Channels
March 11, 2008, 12:00am PDT
In this paper, the authors consider a two-hop MIMO parallel relay channel where a source-destination pair both equipped with M antennas, communicate via K N-antenna half-duplex amplify-and-forward...
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QoS-Enabled Power Saving Access Points for IEEE 802.11e Networks
March 11, 2008, 12:00am PDT
IEEE 802.11 is now being used in many situations where Access Point (AP) power saving would be highly desirable. Unfortunately, this is not possible since the existing standard requires that APs...
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An Indexing Scheduler for Delay Constrained Scheduling with Applications to IEEE 802.16
March 11, 2008, 12:00am PDT
The authors consider the problem of scheduling users on the downlink of a Time Division Multiplexed (TDM) system with constraints on the average packet delays over a fading wireless channel. Their...
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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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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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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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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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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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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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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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