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(609 results)-
Whitepapers
Downlink Packet Scheduling and Resource Allocation in EPON WiMAX Hybrid Access Networks
November 2, 2012, 12:00am PDT
Multimedia applications over the Internet, such as IPTV and video on demand, have become fast growing applications in recent years. Such applications have stringent Quality of Services (QoS)...
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Whitepapers
Study on Multi-Channel Mesh Deterministic Access for Wireless Mesh LAN
October 16, 2012, 12:00am PDT
IEEE802.11s paper proposes a new Medium Access Control (MAC) function Mesh Deterministic Access (MDA), which is mainly used for single channel wireless mesh Local Area Network (LAN). In single...
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Whitepapers
Effect of LED Emission Cross-Section in Indoor Visible Light Communication Systems
September 12, 2012, 12:00am PDT
Visible Light Communication (VLC) is an optical wireless communication technology that uses visible Light Emitting Diodes (LEDs) as a communication source. Since, the LEDs are also used for...
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Whitepapers
A Novel Reduced Power Compressive Sensing Technique for Wideband Cognitive Radio
September 3, 2012, 12:00am PDT
Wideband spectrum sensing for cognitive radio requires high rate Analog to Digital (A/D) converters whose power consumption is proportional to the sampling rate. In this paper, the authors propose...
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Whitepapers
Interference Activity Aware Multi-Path Routing Protocol
August 22, 2012, 12:00am PDT
With the development of wireless network, framework based on Multi Hop Wireless Network (MHWN) mechanism is paid more attention. However, the unique characteristics of MHWN, such as distributed...
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Whitepapers
Adaptive Multiple Description Video Coding and Transmission for Scene Change
August 21, 2012, 12:00am PDT
In view of perfect compatibility with the standard source and channel codec, temporal sampling based Multiple Description Coding (MDC) has become a better choice for practical applications....
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Whitepapers
Adaptive Sampling with Bayesian Compressive Sensing in Radar Sensor Networks and Image
August 16, 2012, 12:00am PDT
The theory of Bayesian compressive sensing is briefly introduced and the differential entropy for recovery signal is deduced. An evaluation index based on differential entropy is devised and the...
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Whitepapers
Impact of Antenna Correlation on the Performance of Partial Relay Selection
August 16, 2012, 12:00am PDT
Antenna correlation is generally viewed as an obstacle to realize the desired performance of a wireless system. In this paper, the authors investigate the performance of partial relay selection in...
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Whitepapers
Compressive SAR Raw Data with Principal Component Analysis
August 16, 2012, 12:00am PDT
The theory of Synthetic Aperture Radar (SAR) signal model is briefly introduced which is constructed with a series of echo signals in range direction. The procedure of Principal Component Analysis...
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Whitepapers
Distributed Joint Source-Channel Coding for Relay Systems Exploiting Source-Relay Correlation and Source Memory
August 16, 2012, 12:00am PDT
In this paper, the authors propose a Distributed Joint Source Channel Coding (DJSCC) technique that well exploits source relay correlation as well as source memory structure simultaneously for...
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Whitepapers
Characterization and Optimization of the Power Consumption in Wireless Access Networks by Taking Daily Traffic Variations Into Account
August 8, 2012, 12:00am PDT
In this paper, a power consumption model as a function of the traffic is developed for macro cell base stations based on measurements on an actual base station. This model allows developing energy...
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Whitepapers
Multi-Hop Transmission and Routing with Hierarchical Modulation
July 31, 2012, 12:00am PDT
Hierarchical modulation multiplexes layers of different robustness into one stream. Usually being exploited in broadcast systems such as digital video broadcasting, hierarchical modulation can...
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Whitepapers
SNR-Aware and Power-Efficient Multicast Cooperative Routing Algorithm in Wireless Networks
July 28, 2012, 12:00am PDT
Power efficient multicast routing is an active research field in wireless networks because most network nodes are powered by battery. However, this kind of multicast routing only considers the...
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Whitepapers
On the Applicability of Steerable Beams in LTE Advanced Networks With High User Mobility
July 27, 2012, 12:00am PDT
This paper deals with the problem of applying scanning narrow beams to Long Term Evolution (LTE) advanced networks that include in their coverage areas fast moving mobiles. The system scenario is...
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Whitepapers
Kalman Interpolation Filter for Channel Estimation of LTE Downlink in High-Mobility Environments
July 25, 2012, 12:00am PDT
The estimation of fast fading LTE downlink channels in high-speed applications of LTE advanced is investigated in this paper. In order to adequately track the fast time varying channel response,...
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Whitepapers
Subcarrier Allocation Based on Correlated Equilibrium in Multi-Cell OFDMA Systems
July 25, 2012, 12:00am PDT
In uplink Orthogonal Frequency Division Multiple Access (OFDMA) systems, efficient resource allocation can greatly improve system performance. In this paper, taking throughput, inter cell...
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Whitepapers
Adaptive Transport Layer Protocol for Highly Dynamic Environment
July 23, 2012, 12:00am PDT
Computer and wireless communication require Internet accessibility at anytime and anywhere; this includes in a high-speed mobile station such as in speedy trains, fast moving cars as vehicle to...
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Whitepapers
A Unified View of Diversity in Multiantenna-Multicarrier Systems: Analysis and Adaptation Strategies
July 20, 2012, 12:00am PDT
Multicarrier and multiple transmit/receive antenna have become two key technologies underpinning most of the current development and research efforts towards ubiquitous high-throughput wireless...
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Whitepapers
A Novel Vehicular Location Prediction Based on Mobility Patterns for Routing in Urban VANET
July 18, 2012, 12:00am PDT
Location information is crucial for most applications and protocol designs in high-speed Vehicular Ad-hoc NETworks (VANETs). In traditional approaches, this is obtained by object tracking...
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Whitepapers
A Distributed Multi-Robot Adaptive Sampling Scheme for the Estimation of the Spatial Distribution in Widespread Fields
July 18, 2012, 12:00am PDT
Monitoring widespread environmental fields is undoubtedly a practically important area of research with many complex and challenging tasks. It involves the building of models of the fields or...
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Whitepapers
Analysis of Superframe Adjustment and Beacon Transmission for IEEE 802.15.4 Cluster Tree Networks
July 17, 2012, 12:00am PDT
Wireless sensor networks based on the IEEE 802.15.4 standard are able to achieve low power transmissions in the low rate and short distance wireless Personal Area Network (PAN). A cluster tree...
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Whitepapers
Location Information-Assisted Opportunistic Beamforming in LTE System for High-Speed Railway
July 3, 2012, 12:00am PDT
Communication systems of high-speed railway have inherent disadvantages and advantages. The estimation error of Direction Of Arrival (DOA) of desired users caused by channel feedback delay and...
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Whitepapers
Cooperative Space-Time Codes with Network Coding
July 2, 2012, 12:00am PDT
Because of the gains like diversity, throughput, and the coverage extension provided by the Multiple Input Multiple Output (MIMO) systems, it has been part of the various wireless communications...
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Whitepapers
On the Capacity of a SIMO Land Mobile Satellite System at C-Band: Polarized and Depolarized Received Field
June 29, 2012, 12:00am PDT
Land mobile satellite can exploit multiple input multiple output techniques to achieve high transmission rates. This paper evaluates, theoretically, the capacity of the single input multiple...
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Whitepapers
Internet of Things: Where to be is to Trust
June 21, 2012, 12:00am PDT
Networks' creation is getting more and more required, anytime, anywhere. Devices that can participate on these networks can be quite different among them. Sensors, mobiles, home appliances, or...
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Whitepapers
A CoMP Soft Handover Scheme for LTE Systems in High Speed Railway
June 13, 2012, 12:00am PDT
With the development of high-speed railway and public growing demand on data traffic, people pay much more attention to provide high data rate and high reliable services under high mobility...
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Whitepapers
Low Energy Indoor Network: Deployment Optimisation
June 11, 2012, 12:00am PDT
This paper considers what the minimum energy indoor access point deployment is in order to achieve a certain downlink Quality-of-Service. The paper investigates two conventional multiple-access...
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Whitepapers
Non-Volatile Memory Reduction Based on 1-D Memory Space Mapping of a Specific Set of QCLDPC Codes
June 8, 2012, 12:00am PDT
Supporting a great diversity of multi-rate H-matrices for multiple communication protocols requires a large amount of non-volatile memory, which may consume a large silicon area or logic elements...
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Whitepapers
An Improved ITU-R Rain Attenuation Prediction Model Over Terrestrial Microwave Links in Tropical Region
June 7, 2012, 12:00am PDT
An improved approach of predicting rain attenuation Cumulative Distribution (CD) over terrestrial microwave links operating in tropical regions is presented in this paper. The proposed method...
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Whitepapers
Channel Estimation in OFDM Systems Operating Under High Mobility Using Wiener Filter Combined Basis Expansion Model
May 31, 2012, 12:00am PDT
In this paper, the authors first thoroughly analyze Wiener filter combined Least Squares based channel estimation (WF-LS) and then illustrate its limitation in high-speed mobile environments....
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Whitepapers
Selection Based Inter-Relay Power Allocation for Multiple AF Single-Antenna Relays
May 30, 2012, 12:00am PDT
This paper deals with inter-relay power allocation for Multiple-Input Multiple-Output systems with multiple single antenna relays. It is difficult to derive an optimal solution in a closed form...
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Whitepapers
A Framework for Performance Analysis of Geographic Delay-Tolerant Routing
May 30, 2012, 12:00am PDT
A major tool used for evaluating routing protocols in ad hoc and delay-tolerant networks is simulation. Whereas the results from simulations give good insights, they are limited to the specific...
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Whitepapers
Low Complexity PAPR Reduction Methods for Carrier-Aggregated MIMO OFDMA and SC-FDMA Systems
May 21, 2012, 12:00am PDT
New generation wireless systems target to support much higher data rate which requires larger bandwidth than the existing systems. Lack of contiguous spectrum resources and the compatibility...
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Whitepapers
A Cluster-Based Proxy Mobile IPv6 for IP-WSNs
May 17, 2012, 12:00am PDT
The Sensor Proxy Mobile IPv6 (SPMIPv6) has been designed for IP-based wireless sensor networks mobility to potentially save energy consumption by relieving the sensor nodes from participating in...
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Whitepapers
A Polarity Comparison Timing Synchronization Estimation for MB-OFDM-Based UWB Systems
May 14, 2012, 12:00am PDT
The authors propose a new approach for timing synchronization estimation with polarity comparison for Multi-Band Orthogonal Frequency Division Multiplexing (MB-OFDM) based UWB systems. They...
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Whitepapers
PluralisMAC: A Generic Multi-MAC Framework for Heterogeneous, Multiservice Wireless Networks, Applied to Smart Containers
May 10, 2012, 12:00am PDT
Developing energy efficient MAC protocols for lightweight wireless systems has been a challenging task for decades because of the specific requirements of various applications and the varying...
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Whitepapers
A Decentralized Spectrum Allocation and Partitioning Scheme for a Two-Tier Macrofemtocell Network with Downlink Beamforming
May 3, 2012, 12:00am PDT
This paper examines spectrum allocation and partitioning schemes to mitigate cross-tier interference under downlink beamforming environments. The enhanced SIR owing to beamforming allows more...
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Whitepapers
Localized Geometric Topologies With Bounded Node Degree for Three-Dimensional Wireless Sensor Networks
May 1, 2012, 12:00am PDT
Three Dimensional (3D) wireless sensor networks have attracted a lot of attention due to their great potential usages in both commercial and civilian applications, such as environmental data...
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Whitepapers
Optimizing Distance, Transmit Power, and Allocation Time for Reliable Multi-Hop Relay System
April 30, 2012, 12:00am PDT
In multi-hop relay systems, the end-to-end channel capacity is restricted by bottleneck node. In order to prevent some relay nodes from being the bottleneck of system and to guarantee the...
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Whitepapers
Wireless Sensor Network Localization with Connectivity-Based Refinement Using Mass Spring and Kalman Filtering
April 30, 2012, 12:00am PDT
Since many range free localization algorithms depend on only a few anchors and implicit range estimations, they produce poor results. In this paper, the authors propose a distributed range free...
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Whitepapers
The Resonance Frequency Measurement Method of PICCs and the Environmental Influence
July 20, 2007, 12:00am PDT
A chipcard- or RFID-system operating at 13.56 MHz normally consists of three main components: a Proximity Coupling Device (PCD), a Proximity Integrated Circuit Card (PICC) and a host computer. The...
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Whitepapers
Limitations of Range of Operation and Data Rate for 13.56 MHz Load-Modulation Systems
July 23, 2007, 12:00am PDT
The paper presents an analysis of the achievable range of operation and data rate for passive 13.56 MHz load modulation communication. With increasing data rates and lower transponder energy...
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Whitepapers
High Speed RFID/NFC at the Frequency of 13.56 MHz
July 23, 2007, 12:00am PDT
Data-intensive applications based on NFC (Near Field Communication) or applications for health care/e-government will need an increase of the actual defined and standardized transmission rates of...
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Whitepapers
Opportunistic Spectrum Access in Multi-User Multi-Channel Cognitive Radio Networks
September 2, 2011, 12:00am PDT
With the advent of cognitive radio technology, opportunistic spectrum access has the potential to mitigate spectrum scarcity by letting users sense and utilize unused portions of licensed spectrum...
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Whitepapers
Parallel Implementations of Beamforming Design and Filtering for Microphone Array Applications
September 2, 2011, 12:00am PDT
One of the main limitations of microphone array algorithms for audio applications has been their high computational cost in real acoustic environments when real-time signal processing is...
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Whitepapers
Perfect Reconstruction DFT Modulated Oversampled Filter Bank Transceivers
September 2, 2011, 12:00am PDT
This paper proposes a novel method for the design of Perfect Reconstruction (PR), Discrete Fourier Transform (DFT) modulated oversampled Filter Banks (FB) for application in multi-carrier...
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Whitepapers
Performance Evaluation of Non-Linear MIMO Precoders Under Transmit Impairments
September 2, 2011, 12:00am PDT
Several Interference Cancellation (IC) schemes have been developed during this last decade for wireless networks to mitigate the effect of intra-network interferences, when each user is equipped...
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Whitepapers
Performances of Polarimetric Subspace SAR Processors for Target Detection and Interference Rejection
September 2, 2011, 12:00am PDT
The authors develop a new Synthetic Aperture Radar (SAR) algorithm based on physical models for the detection of a Man-Made Target (MMT) embedded in strong interferences. These physical models for...
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Whitepapers
Physical Layer Security of Mimo Frequency Selective Channels by Beamforming and Noise Generation
September 2, 2011, 12:00am PDT
This paper addresses physical layer security in MIMO communications over frequency selective wireless channels in the presence of passive eavesdroppers, i.e. the associated channels are unknown to...
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Whitepapers
Power Minimization in Parallel Vector Broadcast Channels with Separate Linear Precoding
September 2, 2011, 12:00am PDT
The problem of power-efficient communication with guaranteed quality of service (expressed in terms of per-user rate constraints) is considered in a set of parallel vector broadcast channels with...
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Whitepapers
Preamble-Based Synchronization for OFDM/OQAM Systems
September 2, 2011, 12:00am PDT
The paper deals with the problem of preamble-based synchronization for OFDM/OQAM systems. Specifically, by exploiting the conjugate-symmetry property of a recently proposed preamble structure, a...
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Whitepapers
Preconditioned Conjugate Gradient IAA Spectral Estimation
September 2, 2011, 12:00am PDT
In this paper, the authors develop superfast approximate algorithms for the computationally efficient implementation of the recent Iterative Adaptive Approach (IAA) spectral estimate. The proposed...
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Whitepapers
Prediction Error Preprocessing for Color Image Compression
September 2, 2011, 12:00am PDT
In this paper, a prediction error preprocessor based on the Just Noticeable Distortion (JND) for the color image compression scheme is presented. The variance of prediction error signals the...
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Whitepapers
Predictive Visual Saliency Model for Surveillance Video
September 2, 2011, 12:00am PDT
Visual Saliency Models (VSM) mimics the human visual sys-tem to distinguish the salient regions from the non-salient ones in an image or video. Most of the visual saliency model in the literature...
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Whitepapers
Punctured 8-PSK Turbo-TCM Transmissions Using Recursive Systematic Convolutional GF (2n) Encoders
September 2, 2011, 12:00am PDT
A new Galois Field GF (2N) structure for designing Recursive Systematic Convolutional (RSC) encoders is presented in this paper. The proposed RSC encoders are used as components of a...
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Whitepapers
Quickest Distributed Detection Via Running Consensus
September 2, 2011, 12:00am PDT
Running consensus is a recently proposed distributed strategy for fostering agreement among sensors of fully flat networks, by interleaving the two stages of measurements and node-to-node...
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Whitepapers
Radar Code Design With a Peak to Average Power Ratio Constraint: A Randomized Approximate Approach
September 2, 2011, 12:00am PDT
This paper considers the problem of radar waveform design in the presence of colored Gaussian disturbance under a Peak to Average power Ratio (PAR) and an energy constraint. Firstly, the authors...
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Whitepapers
Random Sampling ADC for Sparse Spectrum Sensing
September 2, 2011, 12:00am PDT
Scanning large bandwidths (spectrum sensing) pushes today's analog hardware to its limits since periodic sampling at Nyquist rate with sufficient resolution is often prohibitively complex. In this...
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Whitepapers
Range Recursive and Taylor Series Based Space-Time Adaptive Processing for Range Dependent Clutter Rejection
September 2, 2011, 12:00am PDT
This paper presents a new Space Time Adaptive Processing (STAP) for the rejection of range dependent ground clutter in order to detect slow moving targets with airborne radar. STAP usually...
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Whitepapers
Rate Optimization for Incremental Redundancy and Repetition Coding in Relay Networks
September 2, 2011, 12:00am PDT
The deployment of relay nodes is a viable solution to fulfill the demands of high throughput and ubiquitous access for future mobile radio communications. A relay can cooperate by transmitting...
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Whitepapers
Real-Time Computation of Moment Invariants Combined With Contrast Stretching
September 2, 2011, 12:00am PDT
There is a large body of evidence that demonstrates the practicable use of moment invariants in real-time computer vision applications. Object detection, recognition and tracking are some of them,...
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Whitepapers
Real-Time FPGA Implementation and Measured Performance of I/Q Modulation Based Frequency Synthesizer
September 2, 2011, 12:00am PDT
In this paper, the design and implementation of mixed-signal frequency synthesis for wireless communications devices are addressed. The core of the synthesizer builds on digitally synthesized...
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Whitepapers
Real-Time Phase-Isolation Algorithm for Speech Separation
September 2, 2011, 12:00am PDT
Beamforming techniques are applied to microphone arrays with the aim of separating sources and improving intelligibility, by means of spatial filtering. The non-stationary nature of speech implies...
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Whitepapers
Residual Cognitive Network Interference Due to Primary User Miss-Detection
September 2, 2011, 12:00am PDT
In this paper, the authors study the coexistence between a Primary User (PU) communication and a Cognitive Radio (CR) network in a general framework that includes wireless propagation subject to...
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Whitepapers
Residual Energy-Aware Collaborative Transmission Beamforming in Wireless Sensor Networks
September 2, 2011, 12:00am PDT
Energy-Efficient transmission techniques are very important for extending the lifetime of a Wireless Sensor Network (WSN) given that recharging batteries of a large number of WSN nodes is a very...
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Whitepapers
Robust Acoustic Speaker Localization with Distributed Microphones
September 2, 2011, 12:00am PDT
This contribution to acoustic source localization presents a robust approach verified with ten distributed microphones in a laboratory apartment under reverberant acoustic conditions. Based on the...
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Whitepapers
Robust Conjoint Analysis by Controlling Outlier Sparsity
September 2, 2011, 12:00am PDT
Preference Measurement (PM) has a long history in marketing, healthcare, and the bio-behavioral sciences, where conjoint analysis is commonly used. The goal of PM is to learn the utility function...
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Whitepapers
Robust Dual-Channel Noise Power Spectral Density Estimation
September 2, 2011, 12:00am PDT
In this paper, the authors propose a novel noise Power Spectral Density (PSD) estimator which is beneficial for speech enhancement systems with two microphones in diffuse noise environments. The...
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Whitepapers
Robust Feature Selection for Scaling Ambiguity Reduction in Audio-Visual Convolutive BSS
September 2, 2011, 12:00am PDT
Information from video has been used recently to address the issue of scaling ambiguity in convolutive Blind Source Separation (BSS) in the frequency domain, based on statistical modeling of the...
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Whitepapers
Robust Pareto Optimal Beamforming in Two-User Multiple-Input Single-Output Interference Channel
September 2, 2011, 12:00am PDT
The authors consider a two-user multiple-input single-output interference channel in which the receivers treat interference as additive noise. The transmitters are assumed to have imperfect...
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Whitepapers
Robust Spectrum Sensing for Cognitive Radio
September 2, 2011, 12:00am PDT
This paper studies spectrum sensing in the context of cognitive radio. The proposed detector is robust with respect to disturbing impulses that are in practice present in many cases in addition to...
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Whitepapers
Robust Time-Slotted Round-Trip Carrier and Timing Synchronization for Distributed Beamforming
September 2, 2011, 12:00am PDT
Distributed beamforming has arisen as a significant approach in multi-user wireless communication systems. It allows several transmitters with common information to emulate an antenna array and...
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Whitepapers
Robust Video Watermarking Using Maximum Likelihood Decoder
September 2, 2011, 12:00am PDT
In this paper, a robust multiplicative video watermarking scheme is presented. The authors segment the video signal into 3-D blocks like cubes, and then apply 3-D wavelet transform to each block....
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Whitepapers
SAR Imagery Classification in Extended Feature Space by Collective Network of Binary Classifiers
September 2, 2011, 12:00am PDT
Polari metric SAR image classification has been an active research field where several features and classifiers have been proposed in the past. Using numerous features can be a desirable option so...
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Whitepapers
Scatter Matrices with Independent Block Property and ISA
September 2, 2011, 12:00am PDT
In Independent Component Analysis (ICA) it is often assumed that the p components of the observation vector are linear combinations of p underlying independent components. Two scatter matrices...
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Whitepapers
Segmentation of Ultrasound Images Using a Spatially Coherent Generalized Rayleigh Mixture Model
September 2, 2011, 12:00am PDT
This paper addresses the problem of jointly estimating the statistical distribution and segmenting multiple-tissue high-frequency ultrasound images. The distribution of multiple-tissue images is...
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Whitepapers
Sensitivity of the Random Demodulation Framework to Filter Tolerances
September 2, 2011, 12:00am PDT
The aim of the present paper is to demonstrate the impact of low-pass filter non-idealities on compressed sensing signal reconstruction in the Random Demodulator (RD) architecture. The random...
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Whitepapers
Signal Adaptive Hardware Design of a System for Highly Nonstationary FM Signal Estimation
September 2, 2011, 12:00am PDT
Multiple-clock-Cycle Implementation (MCI) of a signal adaptive optimal nonstationary filtering system is developed. The proposed design is based on the real-time results of time-frequency (TF)...
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Whitepapers
Signal Processing Algorithms for Removing Banding Artifacts in MRI
September 2, 2011, 12:00am PDT
In Magnetic Resonance Imaging (MRI), the Balanced Steady State Free Precession (bSSFP) pulse sequence has shown to be of great interest, due to its relatively high signal-to-noise ratio in a short...
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Whitepapers
Signal Separation in the Wigner Distribution Domain Using Fractional Fourier Transform
September 2, 2011, 12:00am PDT
In this paper the authors propose an algorithm based on the fractional Fourier transform to separate the different components of a signal in the Wigner time-frequency domain. The aim is to obtain...
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