EURASIP

Displaying 1-40 of 670 results

  • White Papers // Nov 2012

    Modeling of Wireless Networks Using Multivariate Time Models

    The literature analysis of propagation models has investigated different statistical prediction methods to identify appropriate techniques for this purpose. This paper presents the results of propagation channel modeling, based on multivariate time series models using data collected in measurement campaigns and the main characteristics of urbanization in the city of...

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  • White Papers // Oct 2012

    Performance Enhancement of Wireless Mobile Adhoc Networks Through Improved Error Correction and ICI Cancellation

    Mobile Ad hoc NETwork (MANET) refers to an arrangement of wireless mobile nodes that have the tendency of dynamically and freely self-organizing into temporary and arbitrary network topologies. Orthogonal Frequency Division Multiplexing (OFDM) is the foremost choice for MANET system designers at the Physical Layer due to its inherent property...

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  • White Papers // Aug 2012

    A Robust Cross-Layer Metric for Routing Protocol in Mobile Wireless Ad Hoc Networks

    In a Mobile Ad-hoc NETwork (MANET) where Mobile Nodes (MNs) self-organize to ensure the communication over radio links, routing protocols clearly play a significant role. In future MANETs, protocols should provide routing under full mobility, power constraints, fast time-varying channels, and nodes subject to high loading. In this paper, a...

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  • White Papers // Jun 2011

    Generalized Function Projective Synchronization of Chaotic Systems for Secure Communication

    By using the Generalized Function Projective Synchronization (GFPS) method, in this paper, a new scheme for secure information transmission is proposed. The Liu system is employed to encrypt the information signal. In the transmitter, the original information signal is modulated into the system parameter of the chaotic systems. In the...

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  • White Papers // Sep 2011

    Energy-Efficient Link Adaptation on Parallel Channels

    Energy efficiency in mobile communication devices is becoming more and more important because of the increasing gap between power consumption of signal processing circuits and battery capacity. Improved energy efficiency involves minimizing the energy consumption per bit or equivalently maximizing a "Throughput per Joule" metric. Previous work on optimization of...

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  • White Papers // Sep 2011

    A 1 Gbin/s CABAC Encoder for H.264/AVC

    In this paper, the authors propose a 1 Gbin/s Context-based Adaptive Binary Arithmetic Coding (CABAC) encoder architecture for beyond-HDTV applications. CABAC is a crucial part in H.264/AVC main and high profiles that provides a great compression ratio at the expense of high computational complexity. And it is also considered as...

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  • White Papers // Sep 2011

    A 16-65 Cycles/MB H.264/avc Motion Compensation Architecture for Quad-HD Applications

    This paper presents a motion compensation architecture for Quad-HD H.264/AVC video decoder. For meeting the high throughput requirement, reducing power consumption and solving the memory latency problems, three optimization schemes are applied in this work. Firstly, a quarter-pel interpolator based on Horizontal-Vertical Expansion and Luma-Chroma Parallelism (HVE-LCP) is proposed to...

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  • White Papers // Sep 2011

    3-Dimensional Digital Fingerprint of Paintings

    Paintings are typically considered as more or less flat objects with color as the most relevant information. Therefore, they are mainly documented with conventional 2D techniques, which cannot record the 3D relief. However, there are many paintings, especially those with a 3D relief in the mm range, where this relief...

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  • White Papers // Sep 2011

    3D Video Coding via Motion Compensation of Superpixels

    Most of the past and current video coders partition the input frames into regular blocks of pixels that are approximated by a motion estimation unit and coded via a block-based transform. A better performance can be obtained by adapting the size of the approximated region to the geometry and the...

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  • White Papers // Sep 2011

    A Bayesian Approach for Noise Suppression of Speech Signal in Real Environment

    Numerous noise suppression methods for speech signals have been developed up to now. In this paper, a new method to suppress noise in speech signals is proposed, which requires a single microphone only and doesn't need any priori information on both noise spectrum and pitch. It works in the presence...

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  • White Papers // Sep 2011

    A Bimodal Sound Source Model for Vehicle Tracking in Traffic Monitoring

    The paper addresses road traffic monitoring using a compact microphone array. More precisely, estimation of both speed and wheelbase distance of detected vehicles is performed. The detection algorithm is based on the comparison between theoretical and measured correlation time series using the two dimensional Bravais-Pearson correlation coefficient. The tracking step...

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  • White Papers // Sep 2011

    ZF DFE Transceiver Design for Mimo Relay Systems with Direct Source-Destination Link

    In this paper the authors consider a non-linear transceiver design for non-regenerative Multiple-Input Multiple-Output (MIMO) relay networks where a direct link exists between the source and destination. They system utilises linear processors at the source and relay as well as a Zero-Forcing (ZF) Decision Feedback Equaliser (DFE) at the receiver....

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  • White Papers // Sep 2011

    A BSS-Based Approach for Localization of Simultaneous Speakers in Reverberant Conditions

    In this paper, the authors address the localization of simultaneous speakers by means of Blind Source Separation (BSS) based algorithms. Considering BSS demixing filters as some blind null beamformer and producing an acoustical map from them, source localization can be achieved by identifying the local minima of this acoustical map....

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  • White Papers // Sep 2011

    A Co-Training Approach to Automatic Face Recognition

    Semi-supervised face recognition using both labelled and unlabelled data has received considerable interest in recent years. Co-training is one of the most well-known semi-supervised learning methods, but its application in face recognition almost remains unexplored because its assumption of conditional independence can be rarely satisfied between two facial features. However,...

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  • White Papers // Sep 2011

    A Comp Downlink Transmission System Verified by Cellular Field Trials

    It is well-known in theory that a coordinated multipoint downlink transmission can lead to a significant increase in spectral efficiency for cell-edge users, if channel state information at the transmitter is available. A closed-loop system in conjunction with measurement results of a cellular test bed is presented to conduct a...

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  • White Papers // Sep 2011

    A Cross-Relation Based Affine Projection Algorithm for Blind SIMO System Identification

    A new time-domain adaptive algorithm is proposed for blind identification of single-input multiple-output systems that is based on the Cross-Relation (CR) method. The proposed algorithm novelly exploits the affine projection principle to minimize the CR error. As a result, a cost function is minimized that differs from the one used...

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  • White Papers // Sep 2011

    A Fast Method for Computing the Output of Rank Order Filters within Arbitrarily Shaped Windows

    Rank order filters are used in a multitude of image processing tasks. Their application can range from simple preprocessing tasks which aim to reduce/remove noise, to more complex problems where such filters can be used to detect and segment image features. There is, therefore, a need to develop fast algorithms...

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  • White Papers // Sep 2011

    Viseme Definitions Comparison for Visual-Only Speech Recognition

    Audio-Visual Speech Recognition (AVSR) involves recognising of what a speaker is uttering using both audio and visual cues. While phonemes, the units of speech in the audio domain, are well documented, this is not equally true for the speech units in the visual domain: visemes. In the literature, only a...

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  • White Papers // Sep 2011

    A Model for Quasi-Periodic Signals with Application to Rain Estimation From Microwave Link Gain

    It has been observed that rainfall may be estimated from the attenuation of microwave links. In this paper, the authors propose a new approach to this problem (for a single microwave link), which is based on a dynamical model of the attenuation without rain. This dry-air model combines local smoothing...

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  • White Papers // Sep 2011

    A Multi-Sensor Network for the Protection of Cultural Heritage

    The paper presents a novel automatic early warning system to remotely monitor areas of archaeological and cultural interest from the risk of fire. Since these areas have been treasured and tended for very long periods of time, they are usually surrounded by old and valuable vegetation or situated close to...

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  • White Papers // Sep 2011

    Virtual Source Panning Using Multiple-Wise Vector Base in the Multispeaker Stereo Format

    In the last few decades, various panning algorithms have been proposed to generate virtual sound localization in loudspeaker systems. Vector Base Amplitude Panning (VBAP) is the most widely adopted pair wise amplitude panning method. However, pair-wise amplitude panning has a directional discontinuity problem in the multichannel surround panning. In particular,...

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  • White Papers // Sep 2011

    Towards a Low Energy LTE Cellular Network: Architectures

    One of the emerging challenges faced by industrialists and academics is reducing the energy consumption of cellular networks. The impact of the growing energy consumption, both to the environment and to the operational expenditure of operators can no longer be neglected. This paper introduces the Mobile VCE (MVCE) Green Radio...

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  • White Papers // Sep 2011

    Validation of a New Full Reference Metric for Quality Assessment of Mobile 3DTV Content

    3D video is expected to provide an enhanced user experience bringing more realism through depth impression. Therefore, quality assessment plays an important role when designing and optimizing 3D video processing methods and applications. In this paper, the authors propose and validate a novel quality metric based on binocular human visual...

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  • White Papers // Sep 2011

    Use of Cubic Be? Zier Curves for Route Planning

    The authors consider the use of cubic Bezier curves for planning UAV routes. The proposed approach allows the user to trade off the length of the solution route with the level of risk/hazard exposure encountered. Exhaustive search is used to place control points on a 2D grid superimposed on the...

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  • White Papers // Sep 2011

    Unsupervised Restoration in Gaussian Pairwise Mixture Model

    The idea behind the Pairwise Mixture Model (PMM) the authors propose in this work is to classify simultaneously two sets of observations by introducing a joint prior between the two corresponding classifications and some inter-dependence between the two observations. They address the bayesian restoration of PMM using either MPM or...

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  • White Papers // Sep 2011

    Symbol-Wise Processing Implementation of Semi-Iterative Turbo Principle in Multi-Hop Relay Networks

    The latency presents one of the major problems in communication systems. The seriousness increases in more complex physical scenarios, where the latency is accumulated in sequent nodes. The authors propose a novel concept of a latency reduced distributed iterative decoder design in a multi-node wireless network. The concept is based...

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  • White Papers // Dec 2012

    Enhanced Performance of Heterogeneous Networks Through Full-Duplex Relaying

    In this paper, the authors focus on the uplink of a heterogeneous network composed of a macrocell and an underlaid femtocell. They address the problem of the interference caused by the Macro User (MU) on the femtocell [Femto Base Station (FBS) and users]. The femtocell is composed of an user,...

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  • White Papers // Dec 2012

    Resource Allocation in Relay Enhanced LTE-Advanced Networks

    The past few years have brought new possibilities that changed the mobile users' expectations regarding connectivity. New social applications, high-definition multimedia, and other services have made mobile terminals the main connectivity tool for several users, i.e., users want to have the same experience as on a fixed computer. The upcoming...

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  • White Papers // Sep 2011

    Sub-Band Spectral Variance Feature for Noise Robust ASR

    The paper is to improve Automatic Speech Recognition (ASR) performance in very noisy and reverberant environments. The solution is based on extracting sub-band spectral variance normalization based features, which are capable of estimating the relative strengths of speech and noise components both in presence and absence of speech. The advanced...

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  • White Papers // Sep 2011

    Stereoscopic 3D View Synthesis from Unsynchronized Multi-View Video

    The authors present an alternative approach to flexible stereoscopic 3D video content creation. To accomplish a natural image look without the need for expensive hardware or time consuming manual scene modeling, they employ an image-based free-viewpoint system to synthesize the stereoscopic views. By recording the sequence in a sparse multi-view...

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  • White Papers // Sep 2011

    Steady-State Behavior and Design of the Gaussian KLMS Algorithm

    The Kernel Least Mean Square (KLMS) algorithm is popular algorithm in nonlinear adaptive filtering due to its simplicity and robustness. In kernel adaptive filters, the statistics of the input to the linear filter depends on the parameters of the kernel employed. A Gaussian KLMS has two design parameters; the step...

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  • White Papers // Sep 2011

    Spectrally Adapted Mercer Kernels for Support Vector Signal Interpolation

    Interpolation of nonuniformly sampled signals in the presence of noise is a hard and deeply analyzed problem. On the one hand, classical approaches like the Wiener filter use the second order statistics of the signal, and hence its spectrum, as a priori knowledge for finding the solution. On the other...

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  • White Papers // Sep 2011

    Spectral Image Processing and Analysis of the Archimedes Palimpsest

    The Archimedes Palimpsest is a 10th-century parchment manuscript that was erased in the 13th century and overwritten with a Christian prayer book. The Walters Art Museum in Baltimore, MD, USA has supervised ten-year collaboration by conservators, imaging scientists, and scholars to image and transcribe the original writings. This paper reports...

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  • White Papers // Sep 2011

    Speaker Recognition in Noisy Conditions With Limited Training Data

    In this paper the authors present a novel method for performing speaker recognition with very limited training data and in the presence of background noise. Similarity-based speaker recognition is considered so that speaker models can be created with limited training speech data. The proposed similarity is a form of cosine...

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  • White Papers // Sep 2011

    Speaker Localization and Speech Separation Using Phase Difference Versus Frequency Distribution

    This paper proposes a novel sparse source separation method using a pair of microphones. The method is based on Time Frequency (T-F) decomposition, applies the weighted Hough transform to the Phase Difference (PD) versus Frequency (PD-F) distribution of received mixture signals, and estimates source directions. Then, the estimated source directions...

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  • White Papers // Sep 2011

    Speaker Identification Using Diffusion Maps

    In this paper the authors propose a data-driven approach for speaker identification without assuming any particular speaker model. The goal in speaker identification task is to determine which one of a group of known speakers best matches a given voice sample. Here they focus on text-independent speaker identification, i.e. no...

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  • White Papers // Sep 2011

    Spatio-Temporal Fusion of Visual Attention Model

    The motivation behind a spatio-temporal visual saliency model is to extract salient information from two distinct pathways: static (intensity) and dynamic (motion). Consequently, the information from these pathways is combined to get the nal visual saliency map. Since the response of the pathways is dierent, the step of combination of...

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  • White Papers // Sep 2011

    Spatially Adaptive Total Variation Image Denoising Under Salt and Pepper Noise

    Automated selection of the regularization parameter for Total Variation restoration has shown to give very accurate reconstruction results. Most of the literature is devoted to the '2-TV case (images corrupted with Gaussian noise), whereas for the '1-TV case (images corrupted with salt-and-pepper noise) there are only a couple of published...

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  • White Papers // Sep 2011

    Sparsity-Based Composite Detection Tests

    The authors propose an analysis of some connections existing between sparse estimation and detection tests. In addition to the Generalized Likelihood Ratio (GLR) and to the Bayes Factor, they consider two tests based on Maximum A Posteriori estimates of the sparse vector parameter. These detection tests are then set in...

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  • White Papers // Sep 2011

    Sparsity-Aware Adaptive Filtering Based on a Douglas-Rachford Splitting

    In this paper, the authors propose a novel online scheme for the sparse adaptive filtering problem. It is based on a formulation of the adaptive filtering problem as a minimization of the sum of (possibly no smooth) convex functions. Their proposed scheme is a time-varying extension of the so-called Douglas-Rachford...

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