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A blind estimation approach for symbol timing and carrier frequency offset

A blind estimation approach for symbol timing and carrier fr...

引用

IEEE International Workshop on VLSI Design and Video Technology, IWVDVT

作者： Feng Yan Wei-Ping Zhu M.O. Ahmad Centre for Signal Processing and Communications Department of Electrical and Computer Engineering Concordia University Montreal QUE Canada Information Science and Engineering Concordia University Montreal QUE Canada

In this paper, the cyclostationarity of over-sampled signal in orthogonal frequency division multiplexing (OFDM) communication systems is studied. A blind symbol timing and carrier frequency offset estimation algorithm is presented based on the cyclic correlation. The proposed algorithm is computationally efficient, and asymptotically unbiased and consistent. Simulation results show that the proposed algorithm is superior to some of the existing methods in terms of the mean square error (MSE) of the estimate.

关键词： Frequency estimation Timing OFDM signal processing algorithms Fading Interchannel interference Pulse shaping methods Additive noise signal processing Computational modeling

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Design of frequency-invariant beamformers employing multi-dimensional Fourier transforms

Design of frequency-invariant beamformers employing multi-di...

引用

International Workshop on Multidimensional (nD) Systems

作者： Wei Liu S. Weiss Communications & Signal Processing Group Department of Electrical & Electronic Engineering Imperial College London London UK Communications Research Group School of Electronics & Computer Science University of Southampton UK

The design of a class of broadband arrays with frequency invariant beam patterns is studied and a simplified version of the design method employing multi-dimensional Fourier transforms is proposed with detailed account of each step. In the design examples, we give a mathematical explanation for the failure of this method in the lower frequencies. For a design with main beam pointing to a direction other than the broadside, the frequency invariant property is not good and two solutions for this problem are provided.

关键词： Frequency Fourier transforms Sensor arrays Filters Array signal processing signal design Educational institutions computer science Design methodology Two dimensional displays

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Effective memory reduction scheme used for reference frames in H.264/AVC video codec

Effective memory reduction scheme used for reference frames ...

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Midwest Symposium on Circuits and Systems (MWSCAS)

作者： Chih-Chang Chen Sheng-Shiung Chen O.T.C. Chen Chien-Fa Chen Fang-Chu Chen Department of Electrical Engineering Signal and Media Laboratories National Chung Cheng University Taiwan Digital Signal Processing Tech. Department of Computer & Communications Research Laboratory Industrial Technology and Research Institute Taiwan

In the H.264/AVC video codec, multiple reference frames are applied for motion estimation to provide good coding efficiency. However, multiple reference frames also require more memory cost than one reference frame used in a video codec. To minimize the amount of memory requirement, this work proposes to add a decision unit in the H.264/AVC codec to store these reference frames. The said decision unit would look closely at macroblock (MB) of the currently decoded frame to determine it's storage type to be compressed or reconstructed data, according to the encoding parameters of subblocks in this MB. Furthermore, an adaptive scheme is proposed to store the currently decoded frame as reconstructed picture for lowering the computational complexity and using the buffer in full. Experimental results reveal that the proposed memory reduction scheme requires lower complexity and better picture quality than the conventional work. Therefore, the proposed memory reduction scheme can be widely used in various applications of the H.264/AVC codec to minimize the memory requirement.

关键词： Automatic voltage control Video codecs Decoding Buffer storage Motion estimation Costs Computational complexity Videoconference Video compression Encoding

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A frequency domain sphericity test based approach for parsimonious rake receivers in CDMA systems

A frequency domain sphericity test based approach for parsim...

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International Symposium on signal processing and Its Applications (ISSPA)

作者： A.A. El-sallam Y.H. Leung A.M. Zoubir Communications & Signal Processing Group Department of Electrical & Computer Engineering Curtin University of Technology Perth WA Australia Signal Theory Group Institute for Communication Technology Darmstadt University of Technology Merckstrasse Germany

A frequency domain approach is presented for parsimonious channel estimation which can result in the implementation of a low complexity DS-CDMA RAKE receiver. We consider frequency selective slowly fading channels. A new approach is proposed to identify and estiamte only significant channel parameters. The approach uses the sphericity test and delay estimation methods based on averaged periodogram techniques. Simulations show that, with short training sequences and low signal to noise ratio, the proposed technique can correctly identify the significant channel parameters. Also the parsimonious RAKE receiver based on these estimates gives improved statistical as well as computational performance over classical methods.

关键词： Frequency domain analysis System testing Fading Multipath channels Multiaccess communication Baseband signal processing Correlators Fingers Delay

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About room response equalization and dereverberation

About room response equalization and dereverberation

引用

IEEE Workshop on Applications of signal processing to Audio and Acoustics

作者： M. Karjalainen T. Paatero J.N. Mourjopoulos P.D. Hatziantoniou Laboratory of Acoustics and Audio Signal Processing Helsinki University of Technology Finland Audio Group Wire Communications Lab Electrical and Computer Engineering Department University of Patras Patras Greece

Improvement of sound reproduction in rooms by signal processing techniques has been studied seriously for more than twenty years. Such methods are called for example dereverberation, room (response) equalization, and room (response) correction. Understanding the limitations and quality criteria for such methods is gradually achieved through studies of this highly multidimensional problem. In the present paper we discuss the terminology and goals, compare some recent approaches of these techniques in practical cases, and finally point out future challenges

关键词： Acoustic signal processing Multidimensional signal processing Multidimensional systems Terminology

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Cost-effective video filtering solution for real-time vision systems

Cost-effective video filtering solution for real-time vision...

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作者： Fischer, Viktor Lukac, Rastislav Martin, Karl Laboratoire Traitement du Signal et Instrumentation Unité Mixte de Recherche CNRS 5516 Université Jean Monnet 10 rue Barrouin 42000 Saint-Etienne France Multimedia Laboratory Edward S. Rogers Sr. Department of Electrical and Computer Engineering University of Toronto 10 King's College Road Toronto Ont. M5S 3G4 Canada Jean Monnet University of Saint-Etienne France Department of Electronics and Computer Science Micronic Košice Slovakia Edward S. Rogers Sr. Department of Electrical and Computer Engineering University of Toronto Toronto Canada IEEE Circuits and Systems IEEE Consumer Electronics IEEE Signal Processing Societies IEEE Signal Processing Society Communications Society

This paper presents an efficient video filtering scheme and its implementation in a field-programmable logic device (FPLD). Since the proposed nonlinear, spatiotemporal filtering scheme is based on order statistics, its efficient implementation benefits from a bit-serial realization. The utilization of both the spatial and temporal correlation characteristics of the processed video significantly increases the computational demands on this solution, and thus, implementation becomes a significant challenge. Simulation studies reported in this paper indicate that the proposed pipelined bit-serial FPLD filtering solution can achieve speeds of up to 97.6 Mpixels/s and consumes 1700 to 2700 logic cells for the speed-optimized and area-optimized versions, respectively. Thus, the filter area represents only 6.6 to 10.5% of the Altera STRATIX EP1S25 device available on the Altera Stratix DSP evaluation board, which has been used to implement a prototype of the entire real-time vision system. As such, the proposed adaptive video filtering scheme is both practical and attractive for real-time machine vision and surveillance systems as well as conventional video and multimedia applications.

关键词： computer vision

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An embedded system developed for hand held assay used in water monitoring

An embedded system developed for hand held assay used in wat...

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Chemical and Biological Standoff Detection III

作者： Wu, Lin Wang, Jianwei Ramakrishna, Bharath Hsueh, Mingkai Liu, Jonathan Wu, Qufei Wu, Chao-Cheng Cao, Mang Chang, Chein-I. Jensen, Janet L. Jensen, James O. Knapp, Harlan Daniel, Robert Yin, Ray Remote Sensing Signal and Image Processing Laboratory Department of Computer Science and Electrical Engineering University of Maryland Baltimore County Baltimore MD 21250 US Army Edgewood Chemical and Biological Center Aberdeen Proving Ground MD 21010 ANP Technologies Inc. 824 Interchange Boulevard Newark DE 19711

The US Army Joint Service Agent Water Monitor (JSAWM) program is currently interested in an approach that can implement a hardware-designed device in ticket-based hand-held assay (currently being developed) used for chemical/biological agent detection. This paper presents a preliminary investigation of the proof of concept. Three components are envisioned to accomplish the task. One is the ticket development which has been undertaken by the ANP, Inc. Another component is the software development which has been carried out by the Remote Sensing signal and Image processing Laboratory (RSSIPL) at the University of Maryland, Baltimore County (UMBC). A third component is an embedded system development which can be used to drive the UMBC-developed software to analyze the ANP-developed HHA tickets on a small pocket-size device like a PDA. The main focus of this paper is to investigate the third component that is viable and is yet to be explored. In order to facilitate to prove the concept, a flatbed scanner is used to replace a ticket reader to serve as an input device. The Stargate processor board is used as the embedded System with Embedded Linux installed. It is connected to an input device such as scanner as well as output devices such as LCD display or laptop etc. It executes the C-Coded processing program developed for this embedded system and outputs its findings on a display device. The embedded system to be developed and investigated in this paper is the core of a future hardware device. Several issues arising in such an embedded system will be addressed. Finally, the proof-of-concept pilot embedded system will be demonstrated.

关键词： Embedded systems

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3D ROC analysis for detection software used in water monitoring

3D ROC analysis for detection software used in water monitor...

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Chemical and Biological Standoff Detection III

作者： Liu, Wei-Min Wang, Su Chang, Chein-I. Jensen, Janet L. Jensen, James O. Knapp, Harlan Daniel, Robert Yin, Ray Remote Sensing Signal and Image Processing Laboratory Department of Computer Science and Electrical Engineering University of Maryland Baltimore County Baltimore MD 21250 US Army Edgewood Chemical and Biological Center Aberdeen Proving Ground MD 21010 ANP Technologies Inc. 824 Interchange Boulevard Newark DE 19711

Under the U.S. Army sponsored Joint Service Agent Water Monitor (JSAWM) program, developing hand-held assays using tickets for chemical/biological agent detection has been of major interest. One of keys to success is to develop detection algorithms that not only can effectively detect the presence of various agents, but also can quantify the detected agents. This paper presents a recent development of detection software that can perform 3-dimensional (3D) receiver operating characteristics (ROC) analysis which is based on quantified agent concentration. The ROC curves have been widely used in communications, signal processing and medical communities to evaluate the effectiveness of a detection technique. It generally formulates a signal detection problem as a binary composite hypothesis testing problem with the null hypothesis and the alternative hypothesis represents the case of no signal and the case of signal presence respectively. The ROC curve is then plotted based on the detection probability (power) PD versus the false alarm probability, P F. Unfortunately, such a two-dimensional (2D) (PD,P F)-based ROC curve does not factor in the concentration detected in an agent signal which is a crucial parameter in chemical/biological agent detection. The proposed 3D ROC analysis is developed from such a need. It includes an additional parameter, referred to as threshold t, which is used to threshold the detected agent signal concentration. Consequently, a different value of t results in a different 2D ROC curve. In order to take into account the thresholding factor t, a 3D ROC curve is derived and plotted based on three parameters, (PD,PF,t). As a result of the 3D ROC curve, three 2D ROC curves can be also derived. One is the conventional 2D (P D,PF)-ROC curve. Another is a 2D (PD,t)-ROC curve which describes the relationship between PD and the threshold value t. A third one is a 2D (PF,t)-ROC curve which shows the effect of the threshold value t on PF. The utility of

关键词： computer software

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A robust multi-view freehand three-dimensional ultrasound imaging system using volumetric registration

A robust multi-view freehand three-dimensional ultrasound im...

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IEEE International Conference on Systems, Man and Cybernetics

作者： Honggang Yu M.S. Pattichis M.B. Goens Department of Electrical and Computer Engineering Image and Video Processing and Communications Laboratory USA Childrens Hospital Heart Center University of New Mexico Albuquerque NM USA

In this paper, we describe a freehand, three-dimensional ultrasound imaging system. The system uses an electromagnetic position and orientation measurement device to capture two-dimensional ultrasound images at arbitrary planar orientations in space. For robust performance, we use a novel electromagnetic interference detection algorithm that can be used to estimate the probability density function of position and orientation measurement errors. Another important contribution of the proposed system is its ability to reconstruct from multiple standard views. The multi-view reconstruction procedure results in significant reduction in reconstruction error. The system uses object-based 3D volume registration, allowing for arbitrary rigid object movements in inter-view acquisition. The proposed system has been validated on simulated data and a physical, 3D ultrasound calibration phantom. Quantitative experimental results demonstrate the effectiveness of the 3D registration system, and a significant reduction in the mean-squared error via the use of the proposed multi-view reconstruction method.

关键词： Ultrasonic imaging Robustness Image reconstruction Position measurement Electromagnetic devices Extraterrestrial measurements Electromagnetic interference Detection algorithms Probability density function Calibration

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A novel gene mapping algorithm based on independent component analysis

A novel gene mapping algorithm based on independent componen...

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International Conference on Acoustics, Speech, and signal processing (ICASSP)

作者： Z. Dawy M. Sarkis J. Hagenauer J.C. Mueller Department of Electrical and Computer Engineering American University of Beirut Beirut Lebanon Institute for Communications Engineering (LNT) Munich University of Technology Munich Germany Institute for Data Processing (LDV) Munich University of Technology Munich Germany National Research Center for Environment and Health Neuherberg Germany

Identifying the causal genetic markers responsible for complex diseases is a main aim in human genetics. In the context of complex diseases, which are believed to have multiple causal loci of largely unknown effect and position, there is a need to develop advanced methods for gene mapping. In this work, we propose a novel algorithm based on independent component analysis for gene mapping. To apply the algorithm, we model the intra-cellular interactions as a mixing process of multiple sources. Results prove the superiority of the proposed algorithm over conventional statistical based methods, and demonstrate yet another successful application of a well known signal processing technique to an important problem in the field of human genetics.

关键词： Independent component analysis signal processing algorithms Genetics Diseases Humans Genomics Bioinformatics Testing communications technology Data engineering

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