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Institute of Electrical & Electronic Engineers
(11421 results)-
Whitepapers
The Dedicated Optical Connection Protection With IP Traffic in WDM Mesh Networks
March 1, 2012, 12:00am PST
The optical networks based on WDM (Wavelength Division Multiplex) technology can carry enormous amount of data in each fiber link in the network. The networks with the high capacity links have the...
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Whitepapers
Hybrid Power Systems for Cell Sites in Mobile Cellular Networks
January 1, 2012, 12:00am PST
The power consumption of wireless access networks has become a major economic and environmental issue. Providing dedicated low cost power supply to off-grid cell sites located in the rural and...
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Whitepapers
Creating Robust Activity Maps Using Wireless Sensor Network in a Smart Home
September 25, 2007, 12:00am PDT
This paper presents a practical application called "Activity map" to serve as guidance to show ambient intelligence-related contextual information gathered from both humans and their surrounding...
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Whitepapers
OLIC: OnLine Information Compression for Scalable Hosting Infrastructure Monitoring
June 11, 2011, 12:00am PDT
Quality-Of-Service (QoS) management often requires a continuous monitoring service to provide updated information about different hosts and network links in the managed system. However, it is a...
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Whitepapers
On Channel Estimation for Amplify-and-Forward Two-Way Relay Networks
October 29, 2008, 12:00am PDT
In this paper, the authors study the channel estimation problem for the Two-way Wireless Relay Network (TWRN) where two terminals exchange their information through a relay node in a...
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Whitepapers
Optimal Training Sequence Design for Bi-Directional Relay Networks
October 29, 2008, 12:00am PDT
In this paper, the problem of training sequence design in a bi-directional relay network is investigated. The two nodes Tx1 and Tx2 communicate with each other via a ReLay (RL). The RL receives...
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Whitepapers
Precoding Assisted Blind CFO Estimation in Cooperative SFBC-OFDM Channels With Transmitter/Receiver IQ Imbalances
October 29, 2008, 12:00am PDT
In a distributed cooperative environment, synchronization is a major issue. Especially when OFDM is employed in the physical layer, frequency offset synchronization is of great significance. In...
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Whitepapers
On Channel Estimation and Capacity for Amplify and Forward Relay Networks
October 29, 2008, 12:00am PDT
Relay networks have received considerable attention recently, especially when limited size and power resources impose constraints on the number of antennas within a wireless sensor network. In...
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Whitepapers
Sum Capacity of Opportunistic Scheduling for Multiuser MIMO Systems With Linear Receivers
October 29, 2008, 12:00am PDT
The authors analyze the sum capacity achieved by linear receivers in a multiple-input multiple-output broadcast channel. They consider a simple and practical opportunistic scheduling algorithm,...
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Whitepapers
On the Ergodic Capacity of Frequency Selective MIMO Systems Equipped With MMSE Receivers: An Asymptotic Approach
October 29, 2008, 12:00am PDT
It is now well established that using multiple transmit and receive antennas potentially allows to increase the Shannon capacity of digital communications systems. Since the seminal work of...
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Whitepapers
Optimal Front-End Design for MIMO Receivers
October 29, 2008, 12:00am PDT
The effect of antenna mutual coupling on fading correlation in compact MIMO arrays has received considerable attention. By contrast, relatively little attention has been paid to the noise. In this...
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Whitepapers
A Decomposition Approach to MIMO Interference Relay Networks
October 29, 2008, 12:00am PDT
In this paper, the authors consider a class of wireless ad hoc networks, namely two-hop MIMO interference relay network, where L M-antenna source-destination pairs communicate via K relay nodes...
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Whitepapers
Outage Capacity Analysis of Downlink OFDMA Resource Allocation With Multiple Transmit Antennae and Limited Feedback
October 29, 2008, 12:00am PDT
Opportunistic user allocation and multiple antenna transmission provide significant performance enhancement in future wireless communication systems. In this paper, theoretical outage capacity...
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Whitepapers
AOA Cooperative Position Localization
October 29, 2008, 12:00am PDT
In wireless sensor networks, it is very important to obtain an accurate position of each sensor node. In this paper, the authors consider the potential of Ultra WideBand (UWB) signals for...
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Whitepapers
On Cellular Capacity With Base Station Cooperation
October 29, 2008, 12:00am PDT
This paper is concerned with cellular systems with rate constraints in fading environments. The authors consider a simple but asymptotically optimal Matched Filtering/Successive Interference...
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Whitepapers
Joint Network Coding and Superposition Coding for Multi-User Information Exchange in Wireless Relaying Networks
October 29, 2008, 12:00am PDT
Joint Network Coding and Superposition Coding (JNSC) scheme is proposed for information exchange between more than two users in a wireless relaying network. In this paper, the authors consider two...
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Whitepapers
Denoising Maps and Constellations for Wireless Network Coding in Two-Way Relaying Systems
October 29, 2008, 12:00am PDT
The authors investigate on the design of modulation schemes suited for two - way wireless relaying systems that apply network coding at the physical layer. They consider network coding based on...
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Whitepapers
An Efficient Hybrid ARQ System Using Multilevel Coded Modulation With Reduced Constellation Size
October 29, 2008, 12:00am PDT
In order to guarantee highly reliable communications over noisy channels, the use of retransmission techniques is necessary, and the Hybrid Auto Repeat reQuest (HARQ) technique has been widely...
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Whitepapers
Adaptive Hybrid ARQ in Gaussian and Turbo Coded Systems
October 29, 2008, 12:00am PDT
The authors consider the design of adaptive hybrid Automatic Retransmission reQuest (ARQ) with Incremental Redundancy (IR) in which the transmission rates of different blocks in one hybrid ARQ...
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Whitepapers
Achieving High Frequency Diversity With Subcarrier Allocation in OFDMA Systems
October 29, 2008, 12:00am PDT
OFDM can provide frequency diversity gain for point-to-point communications over frequency-selective slow fading channel. Recent works show that OFDM may also form a flexible and efficient...
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Whitepapers
Diversity Technique Employing Digitized Radio Over Fiber Technology for Wide-Area Ubiquitous Network
October 29, 2008, 12:00am PDT
Wide area ubiquitous networks should have the capability to handle more than 10,000 wireless terminals in a large wireless cell with the radius of several kilometers. However, the functions of...
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Whitepapers
Diversity and Coding Gains of Threshold-Based Generalized Selection Combining
October 29, 2008, 12:00am PDT
In this paper, the authors study the asymptotic performance of Absolute-Threshold and Normalized-Threshold-based Generalized Selection Combining (AT-GSC and NT-GSC) schemes over generalized fading...
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Whitepapers
Diversity Order Analysis of Bit-Interleaved Coded DPSK With Cyclic Delay Diversity
October 29, 2008, 12:00am PDT
Cyclic Delay Diversity (CDD) exploits the principle of the Orthogonal Frequency Division Multiplexing (OFDM) that transforms the delay spread into the frequency selectivity. In order to...
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Whitepapers
Spatial PAPR Reduction Based Beamforming Scheme for EIRP Constrained Systems
October 29, 2008, 12:00am PDT
Certain communications transmitters are restricted by their Equivalent Isotropic Radiated Power (EIRP) rather than the total transmitted power. Important examples are ultra - wideband systems. Use...
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Whitepapers
Correlated Fading in Broadcast MIMO Channels: Curse or Blessing?
October 29, 2008, 12:00am PDT
The impact of transmit correlation on the performance of limited feedback Multi-User MIMO is investigated. Correlated fading is shown to highly influence the probability of scheduling orthogonal...
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Whitepapers
Channel Quantization and Feedback Optimization in Multiuser MIMO-OFDM Downlink Systems
October 29, 2008, 12:00am PDT
The authors consider a multiuser MIMO-OFDM downlink system with single antenna Mobile Terminals (MTs) where channel state information at the base station is provided through limited uplink...
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Whitepapers
Multi-User Multi-Input Multi-Output (MU-MIMO) Downlink Beamforming Systems With Limited Feedback
October 29, 2008, 12:00am PDT
This paper considers Zero-Forcing BeamForming (ZFBF) MUMIMO systems in which one stream is transmitted per user. Assuming no knowledge of other users' channel matrices, User Terminals (UT) feed...
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Whitepapers
Performance of Multi-User MIMO Precoding With Limited Feedback Over Measured Channels
October 29, 2008, 12:00am PDT
In Multi-User Multiple-Input Multiple-Output (MUMIMO) systems, Channel State Information at the Transmitter (CSIT) allows for multi-user spatial multiplexing and thus increases the system...
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Whitepapers
User Selection for Multiple-Antenna Broadcast Channel With Zero-Forcing Beamforming
October 29, 2008, 12:00am PDT
This paper investigates the Zero-Forcing (ZF) beamforming transmit strategy in the multiple-antenna multiuser downlink systems. The authors consider the case of mobile users equipped with multiple...
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Whitepapers
Low Complexity Scheduling for Downlink Multiuser MIMO Systems in Correlated Channels
October 29, 2008, 12:00am PDT
Many successive scheduling schemes associated with linear transmit beamforming have been proposed which can asymptotically achieve the sum rate of Dirty Paper Coding (DPC) in i.i.d. channels. In...
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Whitepapers
A Distributed Space-Frequency Coding for Cooperative Communication Systems With Multiple Carrier Frequency Offsets
October 29, 2008, 12:00am PDT
In cooperative communications, due to the distributed nature, multiple different Carrier Frequency Offsets (CFOs) may be present and make the channel time-varying. It is hard for the receiver to...
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Whitepapers
Distributed Double-Differential Orthogonal Space-Time Coding for Cooperative Networks
October 29, 2008, 12:00am PDT
In this paper, distributed double-differential coding is proposed to avoid the problem of carrier offsets in amplify and forward protocol based cooperative network with two relays. A...
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Whitepapers
Perturbation-Based Distributed Beamforming for Wireless Relay Networks
October 29, 2008, 12:00am PDT
This paper deals with distributed beamforming techniques for wireless networks with half-duplex amplify-and-forward relays. Existing schemes optimize the beamforming weights based on the...
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Whitepapers
A Novel Distributed Space-Time Trellis Code for Asynchronous Cooperative Communications Under Frequency-Selective Channels
October 29, 2008, 12:00am PDT
In most cooperative communications works, perfect synchronization among relay nodes is assumed in order to achieve cooperative diversity. However, this assumption is not realistic due to the...
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Whitepapers
Differential Distributed Space-Frequency Coding for Broadband Non-Regenerative Wireless Relaying Systems
October 29, 2008, 12:00am PDT
Cooperative diversity technique allows a virtual antenna array to achieve diversity, enhance coverage, and potentially increase capacity in a distributed fashion. Previous work in this area has...
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Whitepapers
Capture Effects in Opportunistic Slotted ALOHA Over Rayleigh Fading Channels
October 29, 2008, 12:00am PDT
This paper studies the throughput, average packet delay and average power consumption for Opportunistic Slotted ALOHA (OS-ALOHA) in Rayleigh fading channels. The basic idea of the opportunistic...
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Whitepapers
Convergence of Power Control in a Random Channel Environment
October 29, 2008, 12:00am PDT
In this paper, the authors study the Foschini Miljanic algorithm, which was originally proposed in a static channel environment. They investigate the algorithm in a random channel environment,...
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Whitepapers
Analytical Framework for Performance Evaluation of Hybrid ARQ Schemes
October 29, 2008, 12:00am PDT
In this paper, the performance of Automatic Retransmission reQuest (ARQ) schemes at the forward link of a wireless system with long round trip delay, e.g., a Land Mobile Satellite (LMS) system, is...
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Whitepapers
Delay-Energy Tradeoffs in Wireless Ad-Hoc Networks With Partial Channel State Information
October 29, 2008, 12:00am PDT
Given a wireless network where each link undergoes small-scale (Rayleigh) fading, the authors consider the problem of routing a message from a source node to a target node while minimizing energy...
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Whitepapers
Opportunity Detection for OFDMA Systems With Timing Misalignment
October 29, 2008, 12:00am PDT
Accurate detection of spectrum opportunities within the frequency band of an Orthogonal Frequency Division Multiple Access (OFDMA) system is a critical requirement for the realization of a...
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Whitepapers
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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Whitepapers
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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Whitepapers
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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Whitepapers
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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Whitepapers
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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Whitepapers
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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Whitepapers
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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Whitepapers
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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Whitepapers
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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Whitepapers
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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Whitepapers
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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Whitepapers
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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Whitepapers
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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Whitepapers
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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Whitepapers
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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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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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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A Maximal Power-Conserving Scheduling Algorithm for Broadband Wireless Networks
March 11, 2008, 12:00am PDT
The limitation on the battery lifetime has been a critical issue for the advancement of mobile computing. Different types of power-saving techniques have been proposed in various fields. In order...
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Energy Detection Using Estimated Noise Variance for Spectrum Sensing in Cognitive Radio Networks
March 11, 2008, 12:00am PDT
In this paper, the authors analyze the performance of spectrum sensing based on energy detection. They do not assume the exact noise variance is known a priori. Instead, an estimated noise...
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An End-to-End Measurement-Based Admission Control Policy for VoIP Over Wireless Networks
March 11, 2008, 12:00am PDT
in this paper, the authors present a new policy for admitting Voice over IP (VoIP) sessions over wireless networks. Their proposed policy receives the admission information advertised by the VoIP...
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An Efficient Spatial-Amplitude Diversity Technique for Multicarrier On-Off-Keying Communication Systems
March 11, 2008, 12:00am PDT
Although non-coherent Multicarrier On-Off keying (MOOK) is a relatively bandwidth inefficient technique, the simplicity of its transmitter-receiver pair and inherent coding ability make it a...
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On the Performance of a Multi-User Multi-Antenna System with Transmit Zero-Forcing Beamforming and Feedback Delay
March 11, 2008, 12:00am PDT
This paper considers Zero-Forcing Beam Forming (ZFBF) at the transmitter for a downlink Multi-User Multiple Input Single-Output (MU-MISO) system. Transmit beamforming as a simple yet efficient...
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Architecture of a 802.11b Access Point with SinglePacket Radiolocation
March 11, 2008, 12:00am PDT
This is the third in a series of papers describing an 802.11b (Wi-Fi) radiolocator. This device determines the direction of arrival of individual data packets, at a speed equal to the rate of...
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A Universal Code-Modulated Path-Sharing MultiAntenna Receiver
March 11, 2008, 12:00am PDT
Conventional multi-antenna systems require multiple RF chains, baseband blocks, and Analog-To-Digital Converters (ADC) in the receiver front-end, mandating substantial increases in power...
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Mobility Pattern Aware Routing for Heterogeneous Vehicular Networks
March 11, 2008, 12:00am PDT
The Intelligent Transportation System (ITS), a worldwide initiative program utilizes novel information and communication technology for transport infrastructure and vehicles. Among extensive ITS...
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Voice Capacity Analysis and Enhancement in Wireless LAN
March 11, 2008, 12:00am PDT
Effective support of VoIP over Wireless LAN (WLAN) remains a crucial challenge for the last-mile wireless coverage of IP networks with mobility support. Due to the limited bandwidth available in a...
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