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Proceedings of the Fifth IEEE International Symposium on Signal Processing and Information Technology, 2005.最新文献

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Assessment of the single data set detection algorithms under template mismatch 模板不匹配下的单数据集检测算法评估
E. Aboutanios, B. Mulgrew
The detection of signals with known templates embedded in zero-mean coloured Gaussian interference is relevant to many fields such as radar, sonar, seismology and biomedicine to name a few. Traditional detection algorithms, such as the GLRT and AMF, require a training data set. Recently, single data set (SDS) algorithms, namely the GMLED and MLED, have been proposed to deal with the case where training data may not be available. In this paper, we examine the performance of these algorithms under template (or steering vector) mismatch. We identify three types of mismatch, namely the spatial steering vector mismatch, temporal steering vector mismatch and mismatch in both steering vectors. In each mismath case we derive the expected signal to noise ratio loss with respect to the corresponding matched case. Simulation results are given which show that the SDS algorithms are more sensitive to mismatch mainly due to the interaction between the signal and subspaces estimation. However, this increased sensitivity to mismatch is closely related to the ability to resolve close signals. Therefore, the SDS algorithms exhibit higher resolution
在零均值彩色高斯干涉中嵌入已知模板的信号检测与雷达、声纳、地震学和生物医学等许多领域有关。传统的检测算法,如GLRT和AMF,需要一个训练数据集。最近,人们提出了单数据集(SDS)算法,即GMLED和MLED,以处理可能无法获得训练数据的情况。在本文中,我们研究了这些算法在模板(或转向向量)不匹配下的性能。本文提出了三种不匹配类型,即空间转向向量不匹配、时间转向向量不匹配和两个转向向量都不匹配。在每个错误的情况下,我们推导出相对于相应匹配情况的期望信噪比损失。仿真结果表明,SDS算法对失配更敏感,这主要是由于信号与子空间估计之间的相互作用。然而,这种对不匹配的灵敏度的增加与解析接近信号的能力密切相关。因此,SDS算法具有更高的分辨率
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引用次数: 8
Randomized on-line matching (ROLM): randomized scheduling algorithms for high-speed cell-based switches 随机在线匹配(ROLM):高速小区交换机的随机调度算法
D. Serpanos, M. Gamvrili
Scheduling algorithms for virtual output queuing (VOQ) switches aim to provide high performance (low latency and high throughput), fairness as well as easy and low cost implementation. These goals have led to the development of a wide range of schedulers that are characterized by deterministic decision making. Randomness in decision making enables high performance scheduling as well as fair treatment of requests, when used appropriately. However, it has been proven to be costly in switching environments, which require high speed decisions, as the experience with the first randomized algorithm, namely PIM, is shown. In this paper, we introduce a class of practical scheduling algorithms that employ randomness in a fashion that leads to fast, low cost implementations. The class of algorithms, named random on-line matching (ROLM), employs randomness effectively, calculating maximal matchings and thus, leading to high performance schedulers with optimal mean service time that outperform significantly the competitive deterministic schedulers; furthermore, it employs randomness efficiently, resulting to schedulers that can accommodate effectively high-speed links
虚拟输出队列(VOQ)交换机调度算法的目标是提供高性能(低延迟和高吞吐量)、公平性以及简单和低成本的实现。这些目标导致了一系列以确定性决策为特征的调度器的开发。如果使用得当,决策制定中的随机性可以实现高性能调度以及对请求的公平处理。然而,在需要高速决策的切换环境中,它已被证明是昂贵的,正如使用第一种随机算法(即PIM)的经验所示。在本文中,我们介绍了一类实用的调度算法,它们以一种快速、低成本的方式使用随机性。一类称为随机在线匹配(ROLM)的算法有效地利用随机性,计算最大匹配,从而产生具有最佳平均服务时间的高性能调度程序,其性能明显优于竞争性确定性调度程序;此外,它有效地利用了随机性,导致调度程序可以有效地适应高速链路
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引用次数: 0
The Hough transform (HuT) on geometrical distributions (geodistributions) 几何分布(地理分布)的霍夫变换(HuT)
N. Myridis
In this lecture we investigate the Hough transform (HuT) on geometrical (non-probabilistic) distributions, i.e. on loci of point set distributions in the spatial space. Such distributions are assumed to be linear, circular, spiral etc. The usefulness of the assumption of such distributions is multiple according to the existence of them in a huge variety of image processing problems. Furthermore we present innovative elements of HuT which may lead to the development of means for evaluating HuT of complicated geometrical figures
在这个讲座中,我们研究几何(非概率)分布上的霍夫变换(HuT),即空间空间中点集分布的轨迹。这些分布被假定为线性、圆形、螺旋形等。由于这些分布在大量图像处理问题中的存在,其假设的有用性成倍增加。此外,我们还提出了HuT的创新元素,这可能会导致复杂几何图形HuT评估方法的发展
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引用次数: 0
Multiple wavelet analysis of amplitude/frequency modulated images 调幅/调频图像的多小波分析
G. Metikas, S. Olhede
We consider characterisation and analysis of images with dominant local frequencies: this class contains two-dimensional signals written as sums of amplitude and frequency modulated components. We introduce the usage of the multiple vector-valued continuous Morse wavelets for analysis of such signals. We calculate the continuous wavelet transform and the associated scalogram of an image to extract its local amplitude, frequency and dominant orientation. For images contaminated by additive noise, we estimate the local features of the image using several orthogonal mother wavelet functions with optimal localisation: this allows for the construction of estimators of local image features with reduced variability and bias
我们考虑具有主导局部频率的图像的特征和分析:这一类包含二维信号,写成幅度和频率调制分量的和。我们介绍了用多向量值连续莫尔斯小波分析这类信号。我们计算图像的连续小波变换和相关尺度图,提取图像的局部幅度、频率和优势方向。对于被加性噪声污染的图像,我们使用具有最佳定位的几个正交母小波函数来估计图像的局部特征:这允许构建具有减少可变性和偏差的局部图像特征估计器
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引用次数: 3
A real-time stereo head pose tracking system 实时立体头部姿态跟踪系统
Jingying Chen, Bernard Paul Tiddeman
Head pose tracking is very important in many human machine interfaces. In this paper, a stereo head pose tracking system is proposed, which detects and tracks six facial features (pupils, nostrils and lip corners) automatically when a human face appears in front of two low-cost USB cameras. The epipolar constraint and a 3D facial feature model are used to improve the accuracy and robustness of the system. This system has the advantages of automatically detecting the facial features and recovering the features lost during the tracking process. Encouraging results have been obtained using the proposed system
在许多人机界面中,头部姿态跟踪是非常重要的。本文提出了一种立体头部姿态跟踪系统,当人脸出现在两个低成本的USB摄像头前时,该系统自动检测和跟踪人脸的六个面部特征(瞳孔、鼻孔和嘴角)。利用极极约束和三维人脸特征模型提高了系统的精度和鲁棒性。该系统具有自动检测人脸特征和自动恢复跟踪过程中丢失的人脸特征的优点。应用该系统取得了令人鼓舞的效果
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引用次数: 4
Blind and nonblind nonnegative impulse response ISI channel demodulation using the Richardson-Lucy algorithm 使用Richardson-Lucy算法的盲和非盲非负脉冲响应ISI信道解调
Zhijun Zhao, R. Blahut
Both blind and nonblind demodulation algorithms based on the Richardson-Lucy algorithm for the one-dimensional intersymbol interference channel with nonnegative impulse response function are proposed and compared numerically with the Viterbi demodulation algorithm and the demodulation algorithms based on the Wiener filter. Simulation results show that the demodulation algorithms based on the Richardson-Lucy algorithm have better bit error rate performance than the demodulation algorithms based on the Wiener filter. With the progressive thresholding, the bit error rate curves of both blind and nonblind Richardson-Lucy-based algorithms are within 0.3 dB from that of the Viterbi algorithm throughout the entire simulated signal-to-noise ratio range. While the complexity of the Viterbi algorithm depends critically on the length of the channel impulse response function, the complexity of the demodulation algorithms based on the Richardson-Lucy algorithm only weakly depends on it
针对具有非负脉冲响应函数的一维码间干扰信道,提出了基于Richardson-Lucy算法的盲解调算法和非盲解调算法,并与Viterbi解调算法和基于Wiener滤波器的解调算法进行了数值比较。仿真结果表明,基于Richardson-Lucy算法的解调算法比基于维纳滤波器的解调算法具有更好的误码率性能。通过渐进式阈值分割,在整个模拟信噪比范围内,盲算法和非盲算法的误码率曲线与Viterbi算法的误码率曲线的误差在0.3 dB以内。Viterbi算法的复杂度严重依赖于信道脉冲响应函数的长度,而基于Richardson-Lucy算法的解调算法的复杂度仅弱依赖于它
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引用次数: 14
On computationally-efficient NLMS-based algorithms for echo cancellation applications 基于nlms的回声消除算法研究
E. Abdel-Raheem
This paper investigates computationally-efficient adaptive algorithms suitable for echo cancellation applications. Power-of-two (PO2) quantization for the error and/or regressor vector is added to a selective-partial-coefficient-update algorithm (SPCUA) to further reduce the amount of computations. A simple stop-and-go procedure is included to save more computations when the generated error magnitude is below a certain limit. Simulation results with comparisons are included to show the advantages of the improved algorithms
本文研究了适用于回波抵消应用的计算效率高的自适应算法。在选择性偏系数更新算法(SPCUA)中增加了误差和/或回归向量的2次幂(PO2)量化,以进一步减少计算量。为了在生成的误差值低于某一限度时节省更多的计算,文中还包含了一个简单的走走停停过程。仿真结果表明了改进算法的优越性
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引用次数: 0
A multicarrier CDMA system for combating channel blocking in frequency-selective fading MIMO channel 一种多载波CDMA系统,用于对抗频率选择性衰落MIMO信道中的信道阻塞
T. Fujino, J. Nakamura
Recently we have proposed a multi-carrier code division multiple access (MC-CDMA) scheme for the downlink of mobile communications to combat the channel blocking in flat fading multi-input single-output (MISO) channels. In this paper, the previous proposal is extended to the case of frequency-selective fading multi-input multi-output (MIMO) channels. An enhanced scheme is also proposed to obtain better bit error rate (BER) performance and to facilitate signal detection. BER performance of the proposed system using different detection methods is evaluated by numerical calculation. Without decreasing time, frequency, and transmit (Tx) power efficiencies, the proposed system allows us to extract all the Tx data with relatively good BER even when channel blocking is encountered
针对平坦衰落多输入单输出(MISO)信道中存在的信道阻塞问题,提出了一种用于移动通信下行链路的多载波码分多址(MC-CDMA)方案。本文将上述方法推广到频率选择性衰落多输入多输出信道的情况。为了获得更好的误码率性能和便于信号检测,提出了一种改进方案。采用不同的检测方法对系统的误码率性能进行了数值计算。在不降低时间、频率和传输(Tx)功率效率的情况下,即使遇到信道阻塞,该系统也能以相对较好的误码率提取所有Tx数据
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引用次数: 0
Robust subspace technique for joint angle/Doppler estimation in /spl alpha/-stable clutter using phased fractional lower-order moments 基于相位分数阶矩的/spl α /稳定杂波联合角/多普勒估计鲁棒子空间技术
H. Belkacemi, M. Djeddi, S. Marcos
We consider the problem of joint angle and Doppler estimation for space-time adaptive processing (STAP) airborne radar in non Gaussian clutter modeled as a complex symmetric alpha stable (SaS) process. We introduce a new robust MUSIC algorithm named PFLOM-MUSIC which is obtained using a new class of covariance matrix estimate based on the phased fractional lower-order moment(PFLOM). Such matrix and the subspaces spanned by its eigenvectors serve as a basis for a high-resolution angle/Doppler estimation method. The performance of the PFLOM-MUSIC is examined by comparing the estimation results with those of the sign covariance matrix estimate SCM-MUSIC (T. Liu and J. M. Mendel, Aug. 2001). Extensive Simulations demonstrate that our proposed algorithm outperforms the previously reported estimators
将空时自适应处理(STAP)机载雷达在非高斯杂波环境中的联合角和多普勒估计问题建模为复杂对称α稳定过程。提出了一种新的基于相位分数阶矩(PFLOM)的协方差矩阵估计的鲁棒MUSIC算法PFLOM-MUSIC。该矩阵及其特征向量张成的子空间是高分辨率角度/多普勒估计方法的基础。通过将估计结果与符号协方差矩阵估计SCM-MUSIC的估计结果进行比较,检验了PFLOM-MUSIC的性能(T. Liu and J. M. Mendel, august 2001)。大量的仿真表明,我们提出的算法优于先前报道的估计器
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引用次数: 0
A biophysical model of the human cochlea for speech stimulus using STFT 基于STFT的人耳蜗语音刺激生物物理模型
L. Golipour, S. Gazor
This paper presents a new approach to an auditory model which matches closely the response patterns in physiological data for single tone inputs. Including the biophysical complexity of the wave motion in the cochlea and considering all terms of the motion equation, the new model can evaluate the auditory spectrum using the Basilar membrane (BM) displacement and the inner hair cells' (IHCs) firing rate for all input signals, including speech. We employ the partial differential motion equations of the BM and its parameters measured for the human auditory system, and design an algorithm which uses short time Fourier transform (STFT) to compute the output for speech stimulus. The idea is to isolate the input signal in the vicinity of a time-window and try to follow the changes in its frequencies and their influences on the signal perceived by the auditory system. The new model includes the nonlinearity action of outer hair cells (OHCs) and provides a new auditory spectrum for speech inputs in the real time domain which reflects a proper view of propagating signal in the cochlea. Despite most of the previous models this model can track the effects of high formant frequencies in the human cochlea as well. This model is a new signal processing tool for studying the response of the auditory system to transient signals which is highly demanded in various speech enhancement and audio coding algorithms
本文提出了一种新的听觉模型,该模型与单音输入的生理数据的反应模式密切匹配。考虑到耳蜗波运动的生物物理复杂性,并考虑运动方程的所有项,该模型可以利用基底膜(BM)位移和内毛细胞(IHCs)放电率对包括语音在内的所有输入信号进行听觉频谱评估。利用人类听觉系统中脑机的偏微分运动方程及其测量参数,设计了一种利用短时傅立叶变换(STFT)计算语音刺激输出的算法。这个想法是在时间窗口附近隔离输入信号,并尝试跟踪其频率的变化及其对听觉系统感知的信号的影响。该模型包含了外毛细胞的非线性作用,为语音输入提供了一种新的实时听觉频谱,反映了信号在耳蜗内传播的正确观点。尽管大多数以前的模型,这个模型可以跟踪高峰频率在人类耳蜗的影响。该模型是一种新的信号处理工具,用于研究听觉系统对瞬态信号的响应,这在各种语音增强和音频编码算法中都有很高的要求
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引用次数: 6
期刊
Proceedings of the Fifth IEEE International Symposium on Signal Processing and Information Technology, 2005.
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