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Conference Record of the Thirty-First Asilomar Conference on Signals, Systems and Computers (Cat. No.97CB36136)最新文献

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Methods for analyzing certain signals and images in astronomy using Haar wavelets 用哈尔小波分析天文学中某些信号和图像的方法
Conference Record of the Thirty-First Asilomar Conference on Signals, Systems and Computers (Cat. No.97CB36136) Pub Date : 1997-11-02 DOI: 10.1109/ACSSC.1997.680032
E. Kolaczyk
{"title":"Methods for analyzing certain signals and images in astronomy using Haar wavelets","authors":"E. Kolaczyk","doi":"10.1109/ACSSC.1997.680032","DOIUrl":"https://doi.org/10.1109/ACSSC.1997.680032","url":null,"abstract":"There are a number of signal and image analysis problems in high-energy astrophysics for which wavelet-based denoising methods seem particularly appropriate. These problems typically are characterized by photon counting often at low levels. As a result, care is needed in choosing thresholds that adequately account for the Poisson nature of the noise; simple adaptation of typical Gaussian-based methods usually oversmooths peaks and other sharp structures. The author present a method for denoising Poisson signals and images which contain a sparse structure amid a relatively diffuse background, using Haar wavelets. The method is a variant of the standard wavelet shrinkage algorithm, with appropriately calibrated thresholds, and is implemented in a translation-invariant fashion. The performance of this method is demonstrated using astrophysical data collected on board NASA's Compton Gamma-Ray Observatory.","PeriodicalId":240431,"journal":{"name":"Conference Record of the Thirty-First Asilomar Conference on Signals, Systems and Computers (Cat. No.97CB36136)","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130547987","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
A power efficient implementation of the discrete cosine transform 一个功率高效的离散余弦变换的实现
Conference Record of the Thirty-First Asilomar Conference on Signals, Systems and Computers (Cat. No.97CB36136) Pub Date : 1997-11-02 DOI: 10.1109/ACSSC.1997.680540
C. V. Schimpfle, P. Rieder, J. Nossek
{"title":"A power efficient implementation of the discrete cosine transform","authors":"C. V. Schimpfle, P. Rieder, J. Nossek","doi":"10.1109/ACSSC.1997.680540","DOIUrl":"https://doi.org/10.1109/ACSSC.1997.680540","url":null,"abstract":"A new efficient implementation of a IEEE-standard conform 8 point discrete cosine transform (DCT) is presented. The architecture is based on different classes of orthogonal 2/spl times/2 /spl mu/-rotations used to approximate the angles of the DCT. By using only orthogonal /spl mu/-rotations it is guaranteed, that the whole transform remains orthogonal and perfect reconstruction of the signal can be achieved. It is shown that for the implementation of the DCT with approximated rotation angles (angle quantization) about 28% less shift and add operations are necessary than for a standard conform implementation with coefficient quantization. This lends to a large power benefit due to less adder hardware and less capacitive load of the global interconnects. Besides this, there are some other advantageous aspects concerning the area and delay. To support the full custom design of the layout, module generators for all the different classes /spl mu/-rotations can be used to generate the necessary rotations automatically.","PeriodicalId":240431,"journal":{"name":"Conference Record of the Thirty-First Asilomar Conference on Signals, Systems and Computers (Cat. No.97CB36136)","volume":"71 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130203297","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: 6
Prediction of fast fading parameters by resolving the interference pattern 通过解析干扰图预测快速衰落参数
Conference Record of the Thirty-First Asilomar Conference on Signals, Systems and Computers (Cat. No.97CB36136) Pub Date : 1997-11-02 DOI: 10.1109/ACSSC.1997.680049
T. Eyceoz, A. Duel-Hallen, H. Hallen
{"title":"Prediction of fast fading parameters by resolving the interference pattern","authors":"T. Eyceoz, A. Duel-Hallen, H. Hallen","doi":"10.1109/ACSSC.1997.680049","DOIUrl":"https://doi.org/10.1109/ACSSC.1997.680049","url":null,"abstract":"We investigated a new deterministic approach to the estimation and prediction of the fading channel by exploiting the physical nature of the flat fading signal. Since the direct signal and the reflected signals form an interference pattern, the received signal is given by a sum of several scattered components. These are distinguished by their Doppler shifts at the mobile. The slowly varying parameters associated with these components are determined and tracked, and the composite fading signal is predicted. This approach will potentially result in the ability to anticipate and avoid \"deep fades\" which severely limit the performance of wireless communications systems and will aid in the development of low power mobile radio systems.","PeriodicalId":240431,"journal":{"name":"Conference Record of the Thirty-First Asilomar Conference on Signals, Systems and Computers (Cat. No.97CB36136)","volume":"262 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116485046","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
Small sample properties of the RSS estimation algorithm for Gaussian measurement noise 小样本特性的RSS估计算法用于高斯测量噪声
Conference Record of the Thirty-First Asilomar Conference on Signals, Systems and Computers (Cat. No.97CB36136) Pub Date : 1997-11-02 DOI: 10.1109/ACSSC.1997.679183
C. S. Agate, R. Iltis
{"title":"Small sample properties of the RSS estimation algorithm for Gaussian measurement noise","authors":"C. S. Agate, R. Iltis","doi":"10.1109/ACSSC.1997.679183","DOIUrl":"https://doi.org/10.1109/ACSSC.1997.679183","url":null,"abstract":"The statistics of the reduced sufficient statistics (RSS) estimator are derived for the nonlinear additive white Gaussian noise measurement model. The RSS algorithm recursively propagates a set of sufficient statistics for a mixture density which approximates the true posterior density of a parameter vector. The joint probability density function for the weighting coefficients of the mixture density is derived for the case of additive white Gaussian noise. Through integration of this density, the estimator bias and mean-squared error are determined. The results are applied to a scalar estimation problem in which the sample-averaged statistics are compared to those derived from numerical integration of the density function.","PeriodicalId":240431,"journal":{"name":"Conference Record of the Thirty-First Asilomar Conference on Signals, Systems and Computers (Cat. No.97CB36136)","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126775925","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
A necessary and sufficient condition for commutative PR orthogonal multifilter banks 可交换PR正交多滤波器组的充分必要条件
Conference Record of the Thirty-First Asilomar Conference on Signals, Systems and Computers (Cat. No.97CB36136) Pub Date : 1997-11-02 DOI: 10.1109/ACSSC.1997.679107
K. Johnson
{"title":"A necessary and sufficient condition for commutative PR orthogonal multifilter banks","authors":"K. Johnson","doi":"10.1109/ACSSC.1997.679107","DOIUrl":"https://doi.org/10.1109/ACSSC.1997.679107","url":null,"abstract":"Constructing multiwavelet-based filter banks (multifilters) is more difficult than constructing scalar wavelet filters, partly because the noncommutativity of matrix multiplication prevents a trivial extension of the scalar wavelet \"flip construction\". Commutative multifilters avoid this problem by allowing the flip construction to be used, thereby simplifying the design process. This paper presents a condition on the polyphase components of the analysis multifilters which is necessary and sufficient for the multifilters to achieve commutativity in addition to perfect reconstruction and orthogonality. This condition involves matrices of a form similar to that appearing in various other contexts, some of which are discussed. The paper includes simple examples of multifilters satisfying the condition obtained.","PeriodicalId":240431,"journal":{"name":"Conference Record of the Thirty-First Asilomar Conference on Signals, Systems and Computers (Cat. No.97CB36136)","volume":"185 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126784323","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
Neural network integrated circuits with single-block mixed-signal arrays 单块混合信号阵列的神经网络集成电路
Conference Record of the Thirty-First Asilomar Conference on Signals, Systems and Computers (Cat. No.97CB36136) Pub Date : 1997-11-02 DOI: 10.1142/S0218126698000377
H. Djahanshahi, M. Ahmadi, G. Jullien, W. Miller
{"title":"Neural network integrated circuits with single-block mixed-signal arrays","authors":"H. Djahanshahi, M. Ahmadi, G. Jullien, W. Miller","doi":"10.1142/S0218126698000377","DOIUrl":"https://doi.org/10.1142/S0218126698000377","url":null,"abstract":"This paper discusses the design and implementation of a family of mixed-signal neural network integrated circuits for general and application-specific purposes. Regular arrays of a nonlinearly-loaded multiplier block form the core of multilayer neural networks. Input-output circuitry and network size, however, vary depending on design applications. Some features of the present architecture are highlighted through experimental study, namely, low characteristic variations and self-scaling property of neurons and reduced interconnection problems and areas on silicon. Other design issues such as supply voltage reduction and pin limitations are discussed together with fabrication test results.","PeriodicalId":240431,"journal":{"name":"Conference Record of the Thirty-First Asilomar Conference on Signals, Systems and Computers (Cat. No.97CB36136)","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127972613","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
Constrained bit allocation for error resilient JPEG coding 错误弹性JPEG编码的约束位分配
Conference Record of the Thirty-First Asilomar Conference on Signals, Systems and Computers (Cat. No.97CB36136) Pub Date : 1997-11-02 DOI: 10.1109/ACSSC.1997.679054
Y. Yoo, Antonio Ortega
{"title":"Constrained bit allocation for error resilient JPEG coding","authors":"Y. Yoo, Antonio Ortega","doi":"10.1109/ACSSC.1997.679054","DOIUrl":"https://doi.org/10.1109/ACSSC.1997.679054","url":null,"abstract":"Variable-rate bit streams generated under the current DCT-based JPEG standard are vulnerable to propagation of error across the data units, i.e., DCT blocks. A traditional approach to combat this problem has been to introduce resynchronization markers in the transmitted bitstream. We propose an alternative, and more efficient, approach based on constraining the data length for the blocks or groups of blocks in the compressed image. In the proposed scheme the number of coded bits in each block, or group of blocks, is sent to the decoder as side information and thus the decoder can introduce resynchronization markers. The required overhead is significantly less than that of typical explicit synchronization schemes (e.g., those in JPEG). In addition, it is possible to further constrain the allowable rates for the blocks in order to reduce the overhead. We show experimental results where the constrained rate allocation is performed using thresholding techniques on images encoded by the baseline JPEG.","PeriodicalId":240431,"journal":{"name":"Conference Record of the Thirty-First Asilomar Conference on Signals, Systems and Computers (Cat. No.97CB36136)","volume":"118 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127980049","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
Fast basis selection methods 快速基选择方法
Conference Record of the Thirty-First Asilomar Conference on Signals, Systems and Computers (Cat. No.97CB36136) Pub Date : 1997-11-02 DOI: 10.1109/ACSSC.1997.679149
S. Cotter, M. Murthi, B. Rao
{"title":"Fast basis selection methods","authors":"S. Cotter, M. Murthi, B. Rao","doi":"10.1109/ACSSC.1997.679149","DOIUrl":"https://doi.org/10.1109/ACSSC.1997.679149","url":null,"abstract":"In this paper three methods of basis selection are considered: basic matching pursuit (BMP), order recursive matching pursuit (ORMP) and modified matching pursuit (MMP). These algorithms are briefly described and particular attention is paid, in the formulation of these algorithms, to the computation required. Fast versions of the algorithms are developed. The algorithms are evaluated in terms of their ability to produce a sparse solution and also in terms of their computational complexity and the storage necessary to implement them. Complexity-wise, BMP and MMP are shown to be comparable while ORMP is the most complex. In terms of their ability to select basis vectors, ORMP was the best followed by MMP and then BMP.","PeriodicalId":240431,"journal":{"name":"Conference Record of the Thirty-First Asilomar Conference on Signals, Systems and Computers (Cat. No.97CB36136)","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128782357","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: 12
Joint beamforming and Viterbi equalizer in wireless communications 无线通信中的联合波束形成和维特比均衡器
Conference Record of the Thirty-First Asilomar Conference on Signals, Systems and Computers (Cat. No.97CB36136) Pub Date : 1997-11-02 DOI: 10.1109/ACSSC.1997.680576
Miguel, Lagunas, A. Pérez-Neira, Josep Vidal
{"title":"Joint beamforming and Viterbi equalizer in wireless communications","authors":"Miguel, Lagunas, A. Pérez-Neira, Josep Vidal","doi":"10.1109/ACSSC.1997.680576","DOIUrl":"https://doi.org/10.1109/ACSSC.1997.680576","url":null,"abstract":"The presence of a sequence detector in the baseline architecture for base stations for mobile communications has become a standard. Also the use of coding allows the baseband detector to work at very low signal to noise ratios. When spatial diversity is included in the front-end, the joint design of the beamformer, matched filter and the desired impulse response DIR of the Viterbi equalizer VE is mandatory. This work describes the joint design of these stages when the matched DIR response has priority in the maximization of the signal to noise plus interferences ratio at the input of the VE.","PeriodicalId":240431,"journal":{"name":"Conference Record of the Thirty-First Asilomar Conference on Signals, Systems and Computers (Cat. No.97CB36136)","volume":"52 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133721177","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: 19
The robustness of virtual-ESPRIT against model errors 虚拟esprit对模型误差的鲁棒性
Conference Record of the Thirty-First Asilomar Conference on Signals, Systems and Computers (Cat. No.97CB36136) Pub Date : 1997-11-02 DOI: 10.1109/ACSSC.1997.680369
Tsung-Hsien Liu, J. Mendel
{"title":"The robustness of virtual-ESPRIT against model errors","authors":"Tsung-Hsien Liu, J. Mendel","doi":"10.1109/ACSSC.1997.680369","DOIUrl":"https://doi.org/10.1109/ACSSC.1997.680369","url":null,"abstract":"Virtual-ESPRIT (VESPA) imposes a slight constraint on the array i.e. only a pair of identical sensors are required. We follow the classical procedure to define the sensitivity of VESPA with respect to each model parameter, and derive closed forms for the sensitivity formulas. We justify our derivations by comparing the theoretical formulas with the results from Monte Carlo simulations. Additionally, we demonstrate, by simulations, that VESPA is more robust to model mismatches than ESPRIT in most situations.","PeriodicalId":240431,"journal":{"name":"Conference Record of the Thirty-First Asilomar Conference on Signals, Systems and Computers (Cat. No.97CB36136)","volume":"94 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133677688","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
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