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Institute of Electrical & Electronic Engineers
(11534 results)-
Whitepapers
Optimum MIMO-OFDM Receivers With Imperfect Channel State Information
October 29, 2008, 12:00am PDT
Channel estimation inaccuracy is known to affect significantly the error performance of coded communication systems. This applies in particular to broadband MIMO channels, often considered in...
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Whitepapers
Performance of MIMO Channel Models With Channel State Information at the Transmitter
October 29, 2008, 12:00am PDT
The performance benefits of Multiple Input Multiple Output (MIMO) antenna systems in increasing the throughput of a communication system depends on the type and quality of the information sent to...
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Whitepapers
Bit-Flipping Equalizer and ML Search-Space Analysis in Ultra-Wideband MIMO Channels
October 29, 2008, 12:00am PDT
In this paper, the authors propose a low-complexity equalizer whose performance approaches that of the optimum Maximum-Likelihood (ML) estimator, in Ultra-WideBand (UWB) Multiple-Input...
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Whitepapers
DFE-Based Receiver Implementation for MIMO Systems Employing Hybrid ARQ
October 29, 2008, 12:00am PDT
The implementation of Decision Feedback Equalization-based receivers for MIMO systems that employ Hybrid ARQ (HARQ) is considered. It is shown how the theory of MIMO Decision Feedback Equalization...
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Whitepapers
Direct Location Estimation for MIMO Systems in Multipath Environments
October 29, 2008, 12:00am PDT
Location estimation in Multipath Environments (ME) can lead to significantly higher accuracy if the information contained in the Non-Line-Of-Sight (NLOS) signal components is exploited thoroughly...
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Whitepapers
Using Higher Order Cyclostationarity to Identify Space-Time Block Codes
October 29, 2008, 12:00am PDT
Research in cognitive radios has renewed interest in tools, such as spectrum estimation and modulation identification, to characterize the Radio Frequency (RF) environment. The use of multiple...
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Whitepapers
Performance Analysis of Space-Time Block Coding With Co-Channel MIMO Interferers
October 29, 2008, 12:00am PDT
When MIMO techniques are used in a cellular system, the interference environment can become quite complicated. In this paper, the authors evaluate the impact of co-channel MIMO interference on the...
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Whitepapers
Adaptive Codebooks for Efficient Feedback Reduction in Cooperative Antenna Systems
October 29, 2008, 12:00am PDT
This paper presents an adaptive codebook design method, which introduces a transition probability based codeword sorting scheme in an effort to reduce the feedback overhead by exploiting the...
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Whitepapers
Analysis and Design of Distributed Space-time Trellis Code With Asynchronous Amplify-and-Forward Relaying
October 29, 2008, 12:00am PDT
In this paper, the authors study the asynchronous cooperative diversity schemes employing the Amplify-and-Forward (AF) protocols over the frequency-selective channel. They consider three...
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Whitepapers
High-Rate Groupwise STBC Using Low-Complexity SIC Based Receiver
October 29, 2008, 12:00am PDT
In this paper, using diagonal signal repetition, the authors propose a high-rate Groupwise Space-Time Block Code (GSTBC) which can be effectively decoded by a low-complexity Successive...
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Whitepapers
Easily Invertible Tight Bounds for Diversity Reception
October 26, 2008, 12:00am PDT
Diversity techniques will play a key role in next generation wireless communication systems, thus system design will benefit from a clear understanding of how these techniques affect system...
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Whitepapers
Intra-Vehicle UWB Channel Measurements and Statistical Analysis
October 29, 2008, 12:00am PDT
Ultra-WideBand (UWB) technique attracts attention from automotive manufacturers as a potential way to construct intra-vehicle wireless sensor network. This paper reports the authors' preliminary...
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Whitepapers
Pilot-Aided Multicarrier Wireless Channel Estimation Via MMSE Polynomial Interpolation
October 29, 2008, 12:00am PDT
Orthogonal Frequency Division Multiplexing (OFDM) and Multiple Access (OFDMA) signal receivers often employ pilot-aided channel estimation. For it, an often considered technique is...
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Whitepapers
Channel Estimation and Mitigation Techniques for OFDM in a Doppler Spread Channel
October 29, 2008, 12:00am PDT
The performance of OFDM modulation degrades in a Doppler spread channel due to Inter-Carrier Interference (ICI). Multirate sampling theory and a detection scheme, called Sequential Interference...
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Whitepapers
A Low-Complexity Iterative Channel Estimation and Detection Technique for Doubly Selective Channels
October 29, 2008, 12:00am PDT
In this paper, the authors propose a low-complexity iterative joint channel estimation, detection and decoding technique for doubly selective channels. The key is a segment-by-segment Frequency...
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Whitepapers
DSL Crosstalk Coefficient Acquisition Using SNR Feedback
October 29, 2008, 12:00am PDT
Rapid acquisition of accurate crosstalk estimates is a core requirement for effective precoding in Digital Subscriber Line (DSL) systems. It is shown that Signal-to-Noise Ratio (SNR) reports...
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Whitepapers
Transmitter-Based Minimization of Error Rates in the Downlink of Wireless Systems
October 29, 2008, 12:00am PDT
Using CDMA technology, one has to contend with interference in frequency-selective channels caused by multipath propagation and fading. Transmitter-based methods such as Zero Forcing Joint...
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Whitepapers
A Robust Joint Model-Based Demodulator for Continuous Phase Modulation Signals in an Unknown Environment
October 29, 2008, 12:00am PDT
Cellular communications systems often suffer from co-channel interference, due to signals from adjacent cells interfering with each other. Previous demodulation techniques have relied on...
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Whitepapers
Joint MAP Detection for MIMO-OFDM Systems
October 29, 2008, 12:00am PDT
In this paper, a joint Maximum A Posteriori (MAP) detection algorithm is proposed for Multiple-Input Multiple-Output Orthogonal Frequency Division Multiplexing (MIMO-OFDM) systems. Without the...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
Optimizing Enhanced Hierarchical Modulations
October 29, 2008, 12:00am PDT
Though hierarchical modulation offers an important coverage and throughput tradeoff for wireless communications, it has received relatively little attention to date. Traditional hierarchical...
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Whitepapers
Towards the Performance of ML and the Complexity of MMSE - A Hybrid Approach
October 29, 2008, 12:00am PDT
In this paper, the authors present a near ML-achieving sphere search technique that reduces the number of search operations significantly over existing Sphere Decoding (SD) algorithms. While the...
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Whitepapers
Maximum Likelihood Based Modulation Classification for Unsynchronized QAMs
October 29, 2008, 12:00am PDT
The authors consider modulation classification for Quadrature Amplitude Modulation (QAM) formats. The received signal is assumed to be unsynchronized in both time and frequency, since in practice...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
Impact of Signaling Schemes on Iterative Linear Minimum-Mean-Square-Error Detection
October 29, 2008, 12:00am PDT
In this paper, the authors study the iterative detection problem for a coded system with multi-ary modulation. They show that, with iterative Linear Minimum-Mean-Square-Error (LMMSE) detection,...
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Whitepapers
Filter Design With Secrecy Constraints: The Degraded Parallel Gaussian Wiretap Channel
October 29, 2008, 12:00am PDT
The authors introduce the problem of filter design with secrecy constraints in the classical wiretap scenario, where two legitimate parties, Alice and Bob, communicate in the presence of an...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
Performance Enhancement of Channel-Phase Precoded Ultra-Wideband (CPP-UWB) Systems by Rake Receivers
October 29, 2008, 12:00am PDT
The authors propose to use the Rake receiver to improve the system performance by collecting more signal power in an Ultra-WideBand (UWB) system precoded by the channel phase information, called...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
Effective Frame Level Rate Control for H.264/AVC Video Coding
October 29, 2008, 12:00am PDT
In this paper, the authors present a robost frame level rate control algorithm for H.264/AVC compression standard. Particularly, they propose a simple yet effective approach to deal with B frames,...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
All-Optical Picosecond Signal Processing in a M-Z Interferometer Based on a Multi-Section Semiconductor Optical Amplifier
October 29, 2008, 12:00am PDT
New features of the Cross-Gain Modulation and the Cross-Phase Modulation in a nonlinear active device, made by a cascade of differently biased Semiconductor Optical Amplifiers, have been...
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Whitepapers
Joint Transmit Power and Filter Tap Allocation in DMT Transmitters With Per-Tone Pulse Shaping
October 29, 2008, 12:00am PDT
Per-tone pulse shaping has been proposed as an alternative to time domain spectral shaping for Discrete Multi-Tone (DMT) transmitters, e.g. VDSL modems. This enables the transmitter to use more...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
Low-Complexity Iterative Detection for Spectral Efficient Cooperative Transmission
October 29, 2008, 12:00am PDT
This paper proposes a low-complexity iterative detection scheme with cooperative transmission for Single-Carrier Frequency-Domain Equalization (SC-FDE). To increase the spectral efficiency, a...
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Whitepapers
MMSE Estimation of Distributely Coded Correlated Gaussian Sources Using Random Projections
October 29, 2008, 12:00am PDT
Recent developments in compressed sensing have shown that if a signal has a low Kolmogorov complexity, then it can be reconstructed from a certain number of random projections. The authors study...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
Frequency Estimation Using Multiple Disjoint Pilot Blocks in Burst-Mode Communications
October 29, 2008, 12:00am PDT
A practical data-aided frequency estimator, suitable for use in burst-mode communications, is described and analyzed. The estimator is based on pilot symbols organized into disjoint blocks...
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Whitepapers
Second-order Cyclostationarity of Cyclically Prefixed Single Carrier Linear Digital Modulations With Applications to Signal Recognition
October 29, 2008, 12:00am PDT
The second-order cyclostationarity of Cyclically Prefixed Single Carrier Linear Digital (CP-SCLD) modulated signals is investigated with emphasis on its applicability to signal recognition....
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Whitepapers
Digital-PLL Assisted Frequency Estimation With Improved Error Variance
October 29, 2008, 12:00am PDT
In this paper, the authors present a novel frequency estimation technique, assisted by an imperfect second order arctan based Digital Phase-Locked Loop (D-PLL), for complex single sinusoidal...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
A Fast Least-Squares Solution-Seeker Algorithm for Vector-Perturbation
October 29, 2008, 12:00am PDT
Finding the least-squares solution to a system of linear equations where the unknown vector is comprised of integers, but the matrix coefficient and given vector are comprised of real or complex...
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Whitepapers
Enhancement of the Iterative Spectrum Balancing Algorithm for Power Allocation in DSL Systems
October 29, 2008, 12:00am PDT
The optimization of power allocation in DSL systems is a well studied non-convex problem. In recent years many algorithms have been proposed to solve this problem, but due to the non-convexity,...
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Whitepapers
A Simple Method to Enhance the Detection of Second Order Cyclostationarity
October 29, 2008, 12:00am PDT
Cyclostationarity is a significant feature of numerous physical and man-made processes. Especially in wireless communications, it has been explored and applied for many processing, like timing and...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
Analysis and Algorithm for Non-Pilot-Aided Channel Length Estimation in Wireless Communications
October 29, 2008, 12:00am PDT
Channel estimation and equalization techniques are crucial for the ubiquitous wireless communication systems. Conventional receivers for most wireless standards preset the channel length to the...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
Blind Crosstalk Channel Identification in DMTBased DSL Systems
October 29, 2008, 12:00am PDT
This paper describes a blind crosstalk channel identification method and its application to Discrete MultiTone (DMT)-based Digital Subscriber Line (DSL) systems. Cyclostationarity inherited in...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
Analyzing the Effect of Channel Estimation Errors on the Average Block Error Probability of a MISO Transmit Beamforming System
October 29, 2008, 12:00am PDT
The authors address the problem of analyzing the effect of channel estimation errors on the average BLock Error Probability (BLEP) of transmit beamforming Multiple Input Single Output (MISO)...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
Joint ARQ Receiver Design for Bandwidth Efficient MIMO Systems
October 29, 2008, 12:00am PDT
In this paper, the authors develop a joint ARQ receiver design for channel estimation and equalization under bandwidth efficient Automatic Repeat reQuest (ARQ) in Multiple-Input Multiple-Output...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
Decentralized Bargain: A Two-Tier Market for Efficient and Flexible Dynamic Spectrum Access
May 31, 2012, 12:00am PDT
Market mechanisms have been exploited as important means for spectrum acquisition and access in cognitive radio networks. In this paper, the authors propose a two-tier market for decentralized...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
Channel Equalizer Design Based on Wiener Filter and Least Mean Square Algorithms
February 24, 2009, 12:00am PST
This paper investigates the Wiener and Least Mean Square (LMS) algorithms in the design of traversal tap delay line filters for the purpose of compensating the effect of the communication channel....
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Whitepapers
Wiener Filter Design in Power-Quality Improvement
February 20, 2009, 12:00am PST
This paper designs a Finite Impulse Response (FIR) filter using the Wiener-Hopff Equation, to mitigate Power-Auality (PQ) disturbances caused by harmonics and flickers. The filter design is based...
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Whitepapers
Joint Estimation of Channel and Oscillator Phase Noise in MIMO Systems
September 1, 2012, 12:00am PDT
Oscillator phase noise limits the performance of high speed communication systems since it results in time varying channels and rotation of the signal constellation from symbol to symbol. In this...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
Phase Noise in MIMO Systems: Bayesian Cramer-Rao Bounds and Soft-Input Estimation
January 16, 2013, 12:00am PST
This paper addresses the problem of estimating time varying phase noise caused by imperfect oscillators in Multi-Input Multi-Output (MIMO) systems. The estimation problem is parameterized in...
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Whitepapers
Optimal Training Sequences for Joint Timing Synchronization and Channel Estimation in Distributed Communication Networks
May 21, 2013, 12:00am PDT
For distributed multi-user and multi-relay cooperative networks, the received signal may be affected by Multiple Timing Offsets (MTOs) and multiple channels that need to be jointly estimated for...
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Whitepapers
Transceiver Design for Distributed STBC Based AF Cooperative Networks in the Presence of Timing and Frequency Offsets
December 21, 2012, 12:00am PST
In multi-relay cooperative systems, the signal at the destination is affected by impairments such as multiple channel gains, Multiple Timing Offsets (MTOs), and Multiple Carrier Frequency Offsets...
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Whitepapers
On the Capacity Bounds for Poisson Interference Channels
May 17, 2013, 12:00am PDT
The Poisson interference channel, which models optical communication systems with multiple transceivers, is investigated. Conditions for the strong interference regime are characterized and the...
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Whitepapers
Error Control for Local Broadcasting in Heterogeneous Wireless Ad Hoc Networks
April 1, 2013, 12:00am PDT
Local (single-hop) broadcasting is widely employed in distributed protocols (e.g., neighbor discovery, local information exchange in distributed network optimization and gossip-based algorithms)...
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Whitepapers
The Diversity Potential of Relay Selection With Practical Channel Estimation
February 1, 2013, 12:00am PST
Wireless relaying technology has been recently proposed as a method that promises significant performance improvement in wireless communications without any power increase. Among the most common...
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Whitepapers
Cooperative Robotic Structure Mapping Using Wireless Measurements - A Comparison of Random and Coordinated Sampling Patterns
March 21, 2013, 12:00am PDT
In this paper, the authors consider a mobile robotic network that is tasked with building a map of the objects/obstacles in an environment. They are interested in the see-through mapping of the...
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Whitepapers
Co-Optimization of Communication and Motion Planning of a Robotic Operation Under Resource Constraints and in Fading Environments
January 28, 2013, 12:00am PST
The authors consider the scenario where a robot is tasked with sending a fixed number of given bits of information to a remote station, in a limited operation time, as it travels along a...
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Whitepapers
Diagnosing the Weakest Link in WSN Testbeds: A Reliability and Cost Analysis of the USB Backchannel
September 20, 2012, 12:00am PDT
This paper highlights and characterizes the main obstacle to deploying a robust wireless sensor network testbed: the USB connections that link each of the nodes via Ethernet gateways to the...
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Whitepapers
Minimum Energy Channel Codes for Nanoscale Wireless Communications
April 1, 2013, 12:00am PDT
It is essential to develop energy-efficient communication techniques for nanoscale wireless communications. In this paper, a new modulation and a novel Minimum Energy Coding scheme (MEC) are...
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Whitepapers
A Physical Channel Model for Nanoscale Neuro-Spike Communications
March 1, 2013, 12:00am PST
Nanoscale communications is an appealing domain in nanotechnology. Novel nanoscale communications techniques are currently being devised inspired by some naturally existing phenomena such as the...
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Whitepapers
Performance Analysis of Beacon-Less IEEE 802.15.4 Multi-Hop Networks
February 10, 2012, 12:00am PST
The authors develop an approximate analytical technique for evaluating the performance of multi-hop networks based on beacon-less CSMA/CA as standardised in IEEE 802.15.4, a popular standard for...
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Whitepapers
Insensitive Call Admission Control for Wireless Multiservice Networks
July 8, 2011, 12:00am PDT
Two important quality of service measures for wireless networks are the fraction of new and handover calls that are blocked due to the lack of enough free resources. As handover blocking is more...
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Whitepapers
Handover Performance for Elastic Flows in Mobile Cellular Networks
August 14, 2012, 12:00am PDT
The characterization of flows duration and their handover metrics is of paramount importance for the design and resource management of mobile networks. Elastic flows duration characterization is...
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Whitepapers
First Iteration Policies for Admission Control in Multiaccess Networks
April 18, 2013, 12:00am PDT
This paper explores approximate methods to solve Markov decision processes for large systems through Policy iteration. Two methods, one using an embedded discrete time Markov chain and the other...
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Whitepapers
Privacy-Preserving Profile Matching for Proximity-Based Mobile Social Networking
December 9, 2012, 12:00am PST
Proximity-based Mobile Social Networking (PMSN) refers to the social interaction among physically proximate mobile users. The first step toward effective PMSN is for mobile users to choose whom to...
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Whitepapers
Verifiable Privacy-Preserving Aggregation in People-Centric Urban Sensing Systems
December 11, 2012, 12:00am PST
People-Centric Urban Sensing Systems (PC-USSs) refer to using human-carried mobile devices such as Smartphones and tablets for urban-scale distributed data collection, analysis, and sharing to...
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Whitepapers
Optimal Cluster Head Selection Schemes for Hierarchical OFDMA Based Video Sensor Networks
April 25, 2013, 12:00am PDT
In this paper the authors present a novel framework for Cluster Head (CH) selection and sub-carrier allocation towards intra-cluster communication in an Orthogonal Frequency Division Multiple...
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Whitepapers
Optimal Adaptive Modulation for QoS Constrained Wireless Networks With Renewable Energy Sources
February 1, 2013, 12:00am PST
In this paper, the authors derive the optimal policy to minimize the average number of dropped packets for a delay constrained wireless node with a renewable energy source. The proposed framework...
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Whitepapers
Application-Aware Data Collection in Wireless Sensor Networks
April 3, 2013, 12:00am PDT
Data sharing for data collection among multiple applications is an efficient way to reduce the communication cost of Wireless Sensor Networks (WSNs). This paper is the first work to introduce the...
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Whitepapers
WiBEST: A Hybrid Personal Indoor Positioning System
March 22, 2013, 12:00am PDT
This paper introduces WiBEST, Wireless Body and Environmental Sensor Tracking platform, for personal indoor positioning. WiBEST is built with portable on-body sensor nodes and assisted sensor...
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Whitepapers
Traffic Aware Routing in Urban Vehicular Networks
March 22, 2013, 12:00am PDT
An urban vehicular network is a typical type of Delay Tolerant Network (DTN). Based on the routing analysis in a DTN, the authors first put forward a Minimum Delay and Hop Algorithm (MDHA), which...
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Whitepapers
Data Loss and Reconstruction in Sensor Networks
April 3, 2013, 12:00am PDT
Reconstructing the environment in cyber space by sensory data is a fundamental operation for understanding the physical world in depth. A lot of basic scientific work (e.g., nature discovery,...
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Whitepapers
Networks-on-Chip in a Three-Dimensional Environment: A Performance Evaluation
June 16, 2010, 12:00am PDT
The Network-on-Chip (NoC) paradigm has emerged as a revolutionary methodology for integrating a very high number of Intellectual Property (IP) blocks in a single die. The achievable performance...
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Whitepapers
Design of an Energy Efficient CMOS Compatible NoC Architecture with Millimeter-Wave Wireless Interconnects
September 11, 2012, 12:00am PDT
The Network-on-Chip (NoC) is an enabling technology to integrate large numbers of embedded cores on a single die. The existing methods of implementing a NoC with planar metal interconnects are...
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Whitepapers
Wireless NoC as Interconnection Backbone for Multicore Chips: Promises and Challenges
June 1, 2012, 12:00am PDT
Current commercial Systems-on-Chips (SoCs) designs integrate an increasingly large number of predesigned cores and their number is predicted to increase significantly in the near future. For...
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Whitepapers
Scalable Hybrid Wireless Network-on-Chip Architectures for Multicore Systems
October 1, 2011, 12:00am PDT
Multicore platforms are emerging trends in the design of System-on-Chips (SoCs). Interconnect fabrics for these multicore SoCs play a crucial role in achieving the target performance. The...
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Whitepapers
Precoding-Based Network Alignment for Three Unicast Sessions
May 4, 2013, 12:00am PDT
The authors consider the problem of network coding across three unicast sessions over a directed acyclic graph. They consider a SISO scenario, in the sense that each source and receiver is...
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Resource Allocation for Downlink Channel Transmission Based on Superposition Coding
April 6, 2013, 12:00am PDT
The authors analyze the problem of transmitting information to multiple users over a shared wireless channel. The problem of Resource Allocation (RA) for the users with the knowledge of their...
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Whitepapers
On Achievable Rates for Channels With Mismatched Decoding
May 2, 2013, 12:00am PDT
The problem of mismatched decoding for discrete memoryless channels is addressed. A mismatched cognitive multiple-access channel is introduced, and an inner bound on its capacity region is derived...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
Filter Design With Secrecy Constraints: The MIMO Gaussian Wiretap Channel
May 2, 2013, 12:00am PDT
This paper considers the problem of filter design with secrecy constraints, where two legitimate parties (Alice and Bob) communicate in the presence of an Eavesdropper (Eve), over a Gaussian...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
A 2.0 Gb/s Throughput Decoder for QC-LDPC Convolutional Codes
May 1, 2013, 12:00am PDT
In this paper, the authors propose decoder architecture for Low Density Parity-Check Convolutional Code (LDPCCC). Specifically, the LDPCCC is derived from a Quasi-Cyclic (QC) LDPC block code. By...
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Whitepapers
Delay and Doppler Spreads of Non-Stationary Vehicular Channels for Safety Relevant Scenarios
May 15, 2013, 12:00am PDT
Vehicular communication channels are characterized by a non-stationary time- and frequency-selective fading process due to rapid changes in the environment. The non-stationary fading process can...
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Coverage and Throughput Analysis With a Non-Uniform Femtocell Deployment
May 16, 2013, 12:00am PDT
In this paper, the authors propose a non-uniform femtocell network deployment scheme, in which the femtocell Base Stations (BSs) are not utilized in the region within a prescribed distance away...
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The Thinnest Path Problem
May 16, 2013, 12:00am PDT
The authors consider the thinnest path problem in wireless ad hoc networks. For a given source and a destination, the thinnest path problem asks for a path from the source to the destination that...
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Whitepapers
Wide Band Time-Correlated Model for Wireless Communications Under Impulsive Noise Within Power Substation
May 17, 2013, 12:00am PDT
The installation of wireless technologies in power substations requires characterizing the impulsive noise produced by the high-voltage equipment. Substation impulsive noise might interfere with...
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