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Proceedings of IEEE 6th Digital Signal Processing Workshop最新文献

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Reducing the complexity in a fractal-based image coder 降低基于分形的图像编码器的复杂度
Proceedings of IEEE 6th Digital Signal Processing Workshop Pub Date : 1994-10-02 DOI: 10.1109/DSP.1994.379873
F. J. González, D. Docampo, J. L. Alba
{"title":"Reducing the complexity in a fractal-based image coder","authors":"F. J. González, D. Docampo, J. L. Alba","doi":"10.1109/DSP.1994.379873","DOIUrl":"https://doi.org/10.1109/DSP.1994.379873","url":null,"abstract":"Presents a method for reducing the complexity of encoding still images with fractal based coders. The high computational effort of the exhaustive search of the transform parameters can be substantially reduced by taking advantage of the statistical properties of the discrete cosine transform. The selection of the important transform coefficients, from a visual point of view, provides a reduction of the dimensionality of the transform space that can be employed as a feature selection to design a vector quantizer. The encoder proposed provides a substantial reduction of the execution time of the algorithm, without a noticeable loss of quality.<<ETX>>","PeriodicalId":189083,"journal":{"name":"Proceedings of IEEE 6th Digital Signal Processing Workshop","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125346846","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 14
Interferometric synthetic aperture radar terrain elevation mapping from multiple observations 多观测干涉合成孔径雷达地形高程制图
Proceedings of IEEE 6th Digital Signal Processing Workshop Pub Date : 1994-10-02 DOI: 10.1109/DSP.1994.379880
D. Ghiglia, D. Wahl
{"title":"Interferometric synthetic aperture radar terrain elevation mapping from multiple observations","authors":"D. Ghiglia, D. Wahl","doi":"10.1109/DSP.1994.379880","DOIUrl":"https://doi.org/10.1109/DSP.1994.379880","url":null,"abstract":"All prior interferometric SAR imaging experiments to date dealt with pairwise processing. Simultaneous image collections from two antenna systems or two-pass single antenna collections are processed as interferometric pairs to extract corresponding pixel by pixel phase differences which encode terrain elevation height. The phase differences are wrapped values which must be unwrapped and scaled to yield terrain height. We propose two major classes of techniques that hold promise for robust multibaseline (multiple pair) interferometric SAR terrain elevation mapping. The first builds on the capability of a recently published method for robust weighted and unweighted least-squares phase unwrapping, while the second attacks the problem directly in a maximum likelihood (ML) formulation. We will provide several examples (actual and simulated SAR imagery) that illustrate the advantages and disadvantages of each method.<<ETX>>","PeriodicalId":189083,"journal":{"name":"Proceedings of IEEE 6th Digital Signal Processing Workshop","volume":"18 5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121313193","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 46
Devices for measuring and simulating the mobile radio channel 用于测量和模拟移动无线电信道的装置
Proceedings of IEEE 6th Digital Signal Processing Workshop Pub Date : 1994-10-02 DOI: 10.1109/DSP.1994.379877
H. Schussler, U. Martin
{"title":"Devices for measuring and simulating the mobile radio channel","authors":"H. Schussler, U. Martin","doi":"10.1109/DSP.1994.379877","DOIUrl":"https://doi.org/10.1109/DSP.1994.379877","url":null,"abstract":"A new is described, designed and implemented for measuring the impulse response of the time-varying mobile radio channel in real time. For laboratory experiments a simulator can be used, based on the common Gaussian wide sense stationary uncorrelated scattering (GWSSUS)-model of the channel. So far its parameters have been determined for particular scenarios using theoretical considerations. A method is presented for the estimation of these parameters, using a sequence of measured impulse responses.<<ETX>>","PeriodicalId":189083,"journal":{"name":"Proceedings of IEEE 6th Digital Signal Processing Workshop","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116653277","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Separation of transient signals 暂态信号分离
Proceedings of IEEE 6th Digital Signal Processing Workshop Pub Date : 1994-10-02 DOI: 10.1109/DSP.1994.379841
B.A. Weisburn, T. Parks, R. Shenoy
{"title":"Separation of transient signals","authors":"B.A. Weisburn, T. Parks, R. Shenoy","doi":"10.1109/DSP.1994.379841","DOIUrl":"https://doi.org/10.1109/DSP.1994.379841","url":null,"abstract":"Presents a method for recovering transient signal components which may not be separable either in time or in frequency, but which are linearly separable in the time-frequency plane. A linear operator is formed which selects components lying in a strip situated at an arbitrary angle in time-frequency. Whereas other methods approximate time-varying filters corresponding to different masks in time-frequency, the present method is restricted to strips, but there is no approximation involved. This strip filter is implemented in two ways, using Hermite functions and by chirp modulation, and is tested on a synthetic data signal.<<ETX>>","PeriodicalId":189083,"journal":{"name":"Proceedings of IEEE 6th Digital Signal Processing Workshop","volume":"299 6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130256225","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 8
Robust M-channel biorthogonal filter banks 鲁棒m通道双正交滤波器组
Proceedings of IEEE 6th Digital Signal Processing Workshop Pub Date : 1994-10-02 DOI: 10.1109/DSP.1994.379832
See-May Phoong, P. Vaidyanathan
{"title":"Robust M-channel biorthogonal filter banks","authors":"See-May Phoong, P. Vaidyanathan","doi":"10.1109/DSP.1994.379832","DOIUrl":"https://doi.org/10.1109/DSP.1994.379832","url":null,"abstract":"Phoong and Vaidyanathan (1994) and Phoong et al. introduced a new class of two-channel biorthogonal filter banks. The two-channel systems enjoy many desirable properties. The present paper makes an attempt to generalize the previous results to the M-channel case while preserving the desired properties. The proposed M-channel filter banks have the advantage of low computational complexity. The perfect reconstruction (PR) property is structurally guaranteed, and therefore PR is preserved even when all the parameters are quantized to a finite precision. The new design method allows to design one filter at a time sequentially which is more efficient than designing all M filters simultaneously. Therefore one can control the characteristic of every subband filter separately. These filter banks may find applications where different properties of different subbands are desired.<<ETX>>","PeriodicalId":189083,"journal":{"name":"Proceedings of IEEE 6th Digital Signal Processing Workshop","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134025305","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Adaptive fractionally spaced blind equalization 自适应分数间隔盲均衡
Proceedings of IEEE 6th Digital Signal Processing Workshop Pub Date : 1994-10-02 DOI: 10.1109/DSP.1994.379828
I. Fijalkow, F.L. de Victoria, C. R. Johnson
{"title":"Adaptive fractionally spaced blind equalization","authors":"I. Fijalkow, F.L. de Victoria, C. R. Johnson","doi":"10.1109/DSP.1994.379828","DOIUrl":"https://doi.org/10.1109/DSP.1994.379828","url":null,"abstract":"The asymptotic behavior of the FSE-CMA (i.e., fractionally spaced equalizer adapted by the Godard algorithm) is studied. Under conditions on the channel and equalizer finite length that are known to allow perfect equalization, the authors show that the FSE-CMA cost-function admits only global maxima, global minima and saddle points. However, the set of global minima contains dense sets of infinite extent which can lead to numerical overflow.<<ETX>>","PeriodicalId":189083,"journal":{"name":"Proceedings of IEEE 6th Digital Signal Processing Workshop","volume":"57 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133017422","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 47
Orthogonalization of Gaussian signals for Volterra system identification Volterra系统辨识中高斯信号的正交化
Proceedings of IEEE 6th Digital Signal Processing Workshop Pub Date : 1994-10-02 DOI: 10.1109/DSP.1994.379863
V. J. Mathews
{"title":"Orthogonalization of Gaussian signals for Volterra system identification","authors":"V. J. Mathews","doi":"10.1109/DSP.1994.379863","DOIUrl":"https://doi.org/10.1109/DSP.1994.379863","url":null,"abstract":"This paper presents a very simple method for orthogonalizing Gaussian input signals for identification of truncated Volterra systems. The orthogonalization requires a linear lattice predictor and some nonlinear processing of the backward prediction error signals of the various orders. However, the nonlinear processors do not depend on the statistics of the input signals, and consequently, are easy to design and implement.<<ETX>>","PeriodicalId":189083,"journal":{"name":"Proceedings of IEEE 6th Digital Signal Processing Workshop","volume":"186 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114175811","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 4
Simple adaptation of vector-quantizers to combat channel errors 矢量量化器的简单适应，以对抗信道误差
Proceedings of IEEE 6th Digital Signal Processing Workshop Pub Date : 1994-10-02 DOI: 10.1109/DSP.1994.379878
G. Ben-David, D. Malah
{"title":"Simple adaptation of vector-quantizers to combat channel errors","authors":"G. Ben-David, D. Malah","doi":"10.1109/DSP.1994.379878","DOIUrl":"https://doi.org/10.1109/DSP.1994.379878","url":null,"abstract":"Vector quantization (VQ) is an effective and widely-used method for low-bit-rate communication of speech and image signals. A common assumption in the analysis of VQ systems is that the compressed digital information is transmitted through a perfect channel. Under this assumption, quantizing distortion is the only factor affecting output signal fidelity. However, in physical channels, errors may be present, degrading overall system performance. In order to reduce performance degradation, previous authors suggested to optimally redesign the VQ for noisy channels (\"noisy\" VQ). The \"noisy\" VQ results in smaller distortion as compared to the original (\"noiseless\") VQ for the specific channel it was designed for. The main drawback of this approach is the need to design and store, both in the transmitter and the receiver, several codebooks for different bit error rates (BER). We show that a simple gain adaptation, which depends on the channel BER, also improves system performance, while using the original (\"noiseless\") VQ design. The improvement in some cases, as shown by numerical examples, is close to what can be achieved by the optimal approach.<<ETX>>","PeriodicalId":189083,"journal":{"name":"Proceedings of IEEE 6th Digital Signal Processing Workshop","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117285030","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 7
Approximating non-linear parameter estimators 非线性参数估计的逼近
Proceedings of IEEE 6th Digital Signal Processing Workshop Pub Date : 1994-10-02 DOI: 10.1109/DSP.1994.379848
G. A. Ray
{"title":"Approximating non-linear parameter estimators","authors":"G. A. Ray","doi":"10.1109/DSP.1994.379848","DOIUrl":"https://doi.org/10.1109/DSP.1994.379848","url":null,"abstract":"Many signal processing problems are inherently parameter estimation problems. Such estimators are seldom easy to analytically determine and even if they are found, can be very complicated to compute. The author presents a method to approximate the estimator by a general, easily-computable family of functions. This technique is applied to a multipath height-finding problem in radar.<<ETX>>","PeriodicalId":189083,"journal":{"name":"Proceedings of IEEE 6th Digital Signal Processing Workshop","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124585139","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Multichannel signal modeling and separation 多通道信号建模和分离
Proceedings of IEEE 6th Digital Signal Processing Workshop Pub Date : 1994-10-02 DOI: 10.1109/DSP.1994.379847
S. Shamsunder, Georgios B. Giannakis
{"title":"Multichannel signal modeling and separation","authors":"S. Shamsunder, Georgios B. Giannakis","doi":"10.1109/DSP.1994.379847","DOIUrl":"https://doi.org/10.1109/DSP.1994.379847","url":null,"abstract":"Separation of multiple signals from their superposition recorded at several sensors is addressed. The methods employ polyspectra of the sensor data in order to extract the unknown signals and estimate the exact coupling systems via a linear equation based method. Proposed schemes are also useful for multichannel blind deconvolution even when the input signals are colored with (possibly) overlapping spectra. Simulation results corroborate the applicability of the algorithm.<<ETX>>","PeriodicalId":189083,"journal":{"name":"Proceedings of IEEE 6th Digital Signal Processing Workshop","volume":"76 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116034145","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 7
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