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Fifth ASSP Workshop on Spectrum Estimation and Modeling最新文献

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Progress on signal-selective direction finding 信号选择测向的研究进展
Fifth ASSP Workshop on Spectrum Estimation and Modeling Pub Date : 1900-01-01 DOI: 10.1109/SPECT.1990.205563
S. V. Schell, W. Gardner
{"title":"Progress on signal-selective direction finding","authors":"S. V. Schell, W. Gardner","doi":"10.1109/SPECT.1990.205563","DOIUrl":"https://doi.org/10.1109/SPECT.1990.205563","url":null,"abstract":"The recently discovered Cyclic MUSIC algorithm for narrowband signal-selective direction finding using antenna arrays circumvents many drawbacks of conventional techniques by exploiting known spectral correlation properties (namely known cycle frequencies such as the baud rate or carrier frequency) of the desired signals to reject undesired signals, interference, and noise. Two recent advances in the capabilities of Cyclic MUSIC are described. The first enables Cyclic MUSIC to simultaneously estimate the directions of arrival of signals having different cycle frequencies instead of having to sequentially process each separate frequency in a list of cycle frequencies (either known a priori or measured). The second advance reduces the sensitivity of Cyclic MUSIC to error in the knowledge of the cycle frequency of interest by estimating the frequency of a quadratically-regenerated sine wave and then using that estimate as the cycle frequency parameter in the computation of the cyclic autocorrelation matrix, which is then processed to estimate the directions of arrival.<<ETX>>","PeriodicalId":117661,"journal":{"name":"Fifth ASSP Workshop on Spectrum Estimation and Modeling","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115415254","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: 32
The general source separation problem 一般的源分离问题
Fifth ASSP Workshop on Spectrum Estimation and Modeling Pub Date : 1900-01-01 DOI: 10.1109/SPECT.1990.205565
J. Lacoume, M. Gaeta
{"title":"The general source separation problem","authors":"J. Lacoume, M. Gaeta","doi":"10.1109/SPECT.1990.205565","DOIUrl":"https://doi.org/10.1109/SPECT.1990.205565","url":null,"abstract":"Presents a maximum likelihood approach of the separation problem of independent sources linearly combined. This separation cannot be successful using only the spectral matrix. But it can be done using higher order statistics and in particular the fourth order cumulant of the signals. The general linear case can be solved in frequency domain. In this domain the authors introduce the notion of circular complex variables, and give the maximum likelihood estimator of the source model in the complex data case.<<ETX>>","PeriodicalId":117661,"journal":{"name":"Fifth ASSP Workshop on Spectrum Estimation and Modeling","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125362376","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: 5
On the performance of the family of multichannel MV spectra for recovery of point spectrum 多通道MV谱族在点谱恢复中的性能研究
Fifth ASSP Workshop on Spectrum Estimation and Modeling Pub Date : 1900-01-01 DOI: 10.1109/SPECT.1990.205547
D. Lyon, P. Sherman, A. Frazho
{"title":"On the performance of the family of multichannel MV spectra for recovery of point spectrum","authors":"D. Lyon, P. Sherman, A. Frazho","doi":"10.1109/SPECT.1990.205547","DOIUrl":"https://doi.org/10.1109/SPECT.1990.205547","url":null,"abstract":"The authors evaluate a recently proposed multichannel point spectrum identification scheme, which utilizes the convergence properties of the sequence of minimum-variance (MV) spectral estimates. A number of technical issues associated with implementing the MV multichannel method are discussed. This includes convergence tests to identify signal frequencies and their associated channels. An example is presented.<<ETX>>","PeriodicalId":117661,"journal":{"name":"Fifth ASSP Workshop on Spectrum Estimation and Modeling","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124709074","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: 2
Estimation of coherences between complicated processes 复杂过程间相干性的估计
Fifth ASSP Workshop on Spectrum Estimation and Modeling Pub Date : 1900-01-01 DOI: 10.1109/SPECT.1990.205586
D. Thomson
{"title":"Estimation of coherences between complicated processes","authors":"D. Thomson","doi":"10.1109/SPECT.1990.205586","DOIUrl":"https://doi.org/10.1109/SPECT.1990.205586","url":null,"abstract":"Considers the problem of estimating coherences and transfer functions between processes that individually have complicated spectral densities and for which limited data is available. These processes are assumed to have a continuous spectrum that varies significantly on a frequency scale commensurate with the Rayleigh resolution but the transfer function between the processes does not vary as rapidly. For such calculations the author proposes a variant of the multiple-taper method were the vectors of eigencoefficients are augmented to include derivative terms and the coherences computed as canonical correlations between the blocks. A short simulation study between correlated processes with moderately severe delay within the analysis band shows that the variance of the smoothed canonical correlation estimate is about 20% of the standard multiple window estimate.<<ETX>>","PeriodicalId":117661,"journal":{"name":"Fifth ASSP Workshop on Spectrum Estimation and Modeling","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115780793","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
Decoupling higher order cumulant sequences resulting from three wave coupling processes 由三波耦合过程产生的高阶累积序列解耦
Fifth ASSP Workshop on Spectrum Estimation and Modeling Pub Date : 1900-01-01 DOI: 10.1109/SPECT.1990.205580
D. Sherman, M. Zoltowski
{"title":"Decoupling higher order cumulant sequences resulting from three wave coupling processes","authors":"D. Sherman, M. Zoltowski","doi":"10.1109/SPECT.1990.205580","DOIUrl":"https://doi.org/10.1109/SPECT.1990.205580","url":null,"abstract":"Using cumulant projections, the authors reduce the complexity of the frequency estimation problem for quadratically coupled sinusoids. The bispectrum is viewed along a single radial slice whose defining frequencies are related by a simple ratio. This procedure of taking projections along lines orthogonal to projection axes corresponding to those slices decouples the sinusoids. The projected cumulants contain one-dimensional sinusoids. Projections comprise frequency decoupling. Separating the projected cumulants into symmetric and skew-symmetric cumulants, phase decoupling is achieved. Sinusoidal frequency estimation can be derived from a purely autoregressive (AR) modeling of the skew-symmetric and symmetric cumulants. The predictor polynomials derived from this scheme combine both causal and non-causal components.<<ETX>>","PeriodicalId":117661,"journal":{"name":"Fifth ASSP Workshop on Spectrum Estimation and Modeling","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133994621","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
Identification of nonminimum phase systems using the second- and third-order statistics 用二阶和三阶统计量辨识非最小相位系统
Fifth ASSP Workshop on Spectrum Estimation and Modeling Pub Date : 1900-01-01 DOI: 10.1109/SPECT.1990.205538
S. Alshebeili, A. Venetsanopoulos, A. Cetin
{"title":"Identification of nonminimum phase systems using the second- and third-order statistics","authors":"S. Alshebeili, A. Venetsanopoulos, A. Cetin","doi":"10.1109/SPECT.1990.205538","DOIUrl":"https://doi.org/10.1109/SPECT.1990.205538","url":null,"abstract":"The authors present a method for reconstruction of the impulse response of a nonminimum phase, linear, time-invariant (NMP-LTI) system from the second- and third-order statistics of the output sequence. The method is based on computing the complex cepstrum of the unknown impulse response from the power spectrum and a one-dimensional (1D) slice of the bispectrum. This method has the advantages of being independent of the type of the system (MA, AR, ARMA) and its computational complexity is also independent of the order of the utilized spectrum.<<ETX>>","PeriodicalId":117661,"journal":{"name":"Fifth ASSP Workshop on Spectrum Estimation and Modeling","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123217030","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
Improvement on the estimation of covariance matrices by incorporating cross-correlations 结合互相关对协方差矩阵估计的改进
Fifth ASSP Workshop on Spectrum Estimation and Modeling Pub Date : 1900-01-01 DOI: 10.1109/SPECT.1990.205599
R. Kirlin, W. Du
{"title":"Improvement on the estimation of covariance matrices by incorporating cross-correlations","authors":"R. Kirlin, W. Du","doi":"10.1109/SPECT.1990.205599","DOIUrl":"https://doi.org/10.1109/SPECT.1990.205599","url":null,"abstract":"Addresses the problem of improving the estimate of a covariance matrix from one set of multivariate random processes when there exist non-zero cross-correlations with another set of random processes. The improvement is obtained by linearly combining the first set's sample covariance matrix with covariance matrices predicted via the cross-correlations. The superiority of the proposed method is demonstrated by an application to spatial smoothing for the DOA estimation of coherent narrowband signals using a uniform linear array.<<ETX>>","PeriodicalId":117661,"journal":{"name":"Fifth ASSP Workshop on Spectrum Estimation and Modeling","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123995040","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
ARMA-like and ML-like copy/DF approaches for signal-specific emitter location 类似arma和类似ml的复制/DF方法用于信号特定的发射器位置
Fifth ASSP Workshop on Spectrum Estimation and Modeling Pub Date : 1900-01-01 DOI: 10.1109/SPECT.1990.205561
B. Agee, R. A. Calabretta
{"title":"ARMA-like and ML-like copy/DF approaches for signal-specific emitter location","authors":"B. Agee, R. A. Calabretta","doi":"10.1109/SPECT.1990.205561","DOIUrl":"https://doi.org/10.1109/SPECT.1990.205561","url":null,"abstract":"A general approach for performing signal-specific high-resolution DF of cochannel emitter waveforms is reported. This approach, referred to here as the copy/DF approach, uses the signal copy vectors provided by a blind or nonblind signal extraction algorithm to construct a spatial spectrum for each signal captured by an antenna array, where each spectrum has a global maximum in the direction of the signal captured by that copy vector. The approach can be used with any signal extraction algorithm, and is particularly effective in environments containing strong cochannel interference. Two classes of techniques are presented: ARMA-like techniques, which form spatial spectra with zeroes in the directions of the received interferers and poles in the directions of the copied signals; and ML-like techniques, which approximate the nonblind maximum-likelihood estimate of the direction-of-arrival of the copied emitter waveforms.<<ETX>>","PeriodicalId":117661,"journal":{"name":"Fifth ASSP Workshop on Spectrum Estimation and Modeling","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127521913","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
Optimization of grey-scale morphological statistical estimators 灰度形态统计估计器的优化
Fifth ASSP Workshop on Spectrum Estimation and Modeling Pub Date : 1900-01-01 DOI: 10.1109/SPECT.1990.205570
E. Dougherty
{"title":"Optimization of grey-scale morphological statistical estimators","authors":"E. Dougherty","doi":"10.1109/SPECT.1990.205570","DOIUrl":"https://doi.org/10.1109/SPECT.1990.205570","url":null,"abstract":"General gray-scale morphological filters are interpreted as statistical estimators by employing the Matheron representation for increasing translation-invariant signal-to-signal mappings. Mean-square optimization is discussed, including the minimal search problem and the manner in which classical moving statistical filters fit into the more general morphological paradigm. Key to the method is the automatic generation of structuring elements based upon image statistics.<<ETX>>","PeriodicalId":117661,"journal":{"name":"Fifth ASSP Workshop on Spectrum Estimation and Modeling","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123186941","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
Beamformer preprocessing for enhanced resolution by the MUSIC algorithm (preview) MUSIC算法增强分辨率的波束前预处理(预览)
Fifth ASSP Workshop on Spectrum Estimation and Modeling Pub Date : 1900-01-01 DOI: 10.1109/SPECT.1990.205564
H.B. Lee, M. Wengrovitz
{"title":"Beamformer preprocessing for enhanced resolution by the MUSIC algorithm (preview)","authors":"H.B. Lee, M. Wengrovitz","doi":"10.1109/SPECT.1990.205564","DOIUrl":"https://doi.org/10.1109/SPECT.1990.205564","url":null,"abstract":"Addresses the problem of designing a beamformer so as to enhance resolution of one or more clusters of closely-spaced emitters by the MUSIC algorithm applied in beamspace. A new beamformer design approach is presented for this problem, and is assessed for planar emitter scenarios. A metric is introduced which measures the quality of the sample beamspace MUSIC null spectrum. The approach is to construct the beamforming matrix to maximize the metric for a selected cluster. The resultant (directed) beamformer is specific to that cluster. Examples show that use of beamspace MUSIC with the identified beamformers can produce lower resolution thresholds, biases and variances than a variety of other eigenvector approaches.<<ETX>>","PeriodicalId":117661,"journal":{"name":"Fifth ASSP Workshop on Spectrum Estimation and Modeling","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126529631","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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