Pub Date : 1994-06-26DOI: 10.1109/SSAP.1994.572518
C. Vaidyanathan, K. Buckley
The performance of the minimum variance distortionless response spectrum estimator is studied in this paper. Expressions are derived for the variance of the estimator due to finite data effects and due to random perturbations in the signal model. These expressions are compared with simulation results and are then used to study the characteristics of the estimator.
{"title":"Statistical Analysis of the MVDR Spectrum Estimator","authors":"C. Vaidyanathan, K. Buckley","doi":"10.1109/SSAP.1994.572518","DOIUrl":"https://doi.org/10.1109/SSAP.1994.572518","url":null,"abstract":"The performance of the minimum variance distortionless response spectrum estimator is studied in this paper. Expressions are derived for the variance of the estimator due to finite data effects and due to random perturbations in the signal model. These expressions are compared with simulation results and are then used to study the characteristics of the estimator.","PeriodicalId":151571,"journal":{"name":"IEEE Seventh SP Workshop on Statistical Signal and Array Processing","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1994-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117202100","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}
Pub Date : 1994-06-26DOI: 10.1109/SSAP.1994.572530
B. Radich, K. Buckley
Multiple, equivalent current dipole localization from the scalprecorded EEG (electroencephalogram) has traditionally been accomplished under the unrealistic assumption of a head model parameterized by known physical parameters, such as tissue layer conductivities. In this paper the MAP estimation method is utilized for the joint estimation of dipole locations and uncertain head (secondary) parameters, which are modeled as random. Simulations are presented for random variations in head layer conductivity and radii for the 4-sphere model to demonstrate the MAP technique as a means of achieving robustness to deviations from an idealized head model.
{"title":"Map Estimation of EEG Dipole Source Locations for Head Models with Parameter Uncertainty","authors":"B. Radich, K. Buckley","doi":"10.1109/SSAP.1994.572530","DOIUrl":"https://doi.org/10.1109/SSAP.1994.572530","url":null,"abstract":"Multiple, equivalent current dipole localization from the scalprecorded EEG (electroencephalogram) has traditionally been accomplished under the unrealistic assumption of a head model parameterized by known physical parameters, such as tissue layer conductivities. In this paper the MAP estimation method is utilized for the joint estimation of dipole locations and uncertain head (secondary) parameters, which are modeled as random. Simulations are presented for random variations in head layer conductivity and radii for the 4-sphere model to demonstrate the MAP technique as a means of achieving robustness to deviations from an idealized head model.","PeriodicalId":151571,"journal":{"name":"IEEE Seventh SP Workshop on Statistical Signal and Array Processing","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1994-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123564132","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}
Pub Date : 1994-06-26DOI: 10.1109/SSAP.1994.572487
B. Boashash, B. Ristic
The problem of analysing FM signals affected by white multiplicative noise was originally considered in [f]. In this paper we study a more realistic case of coloured multiplicative noise, and show how the degree of Doppler spread aflects the performance of the WignerVille trispectrum versus the traditional method, such as the WignerVille spectrum (WVS).
{"title":"Analysis of Fm Signals Affected by Coloured Multiplicative Noise Using the Wigner-Ville Trispectrum","authors":"B. Boashash, B. Ristic","doi":"10.1109/SSAP.1994.572487","DOIUrl":"https://doi.org/10.1109/SSAP.1994.572487","url":null,"abstract":"The problem of analysing FM signals affected by white multiplicative noise was originally considered in [f]. In this paper we study a more realistic case of coloured multiplicative noise, and show how the degree of Doppler spread aflects the performance of the WignerVille trispectrum versus the traditional method, such as the WignerVille spectrum (WVS).","PeriodicalId":151571,"journal":{"name":"IEEE Seventh SP Workshop on Statistical Signal and Array Processing","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1994-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121964143","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}
Pub Date : 1994-06-26DOI: 10.1109/SSAP.1994.572519
Q. Wu, K. Wong, Y. Meng, W. Read
{"title":"Doa Estimation of Point and Scattered Sources - Vet-Music","authors":"Q. Wu, K. Wong, Y. Meng, W. Read","doi":"10.1109/SSAP.1994.572519","DOIUrl":"https://doi.org/10.1109/SSAP.1994.572519","url":null,"abstract":"","PeriodicalId":151571,"journal":{"name":"IEEE Seventh SP Workshop on Statistical Signal and Array Processing","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1994-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125029615","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}
Pub Date : 1994-06-26DOI: 10.1109/SSAP.1994.572482
A. Petropulu
A method is presented for the estimation of the parameters of a noncausal nonminimum phase ARMA model for non-Gaussian random processes. Using certain higher-order cepstra slices, the Fourier phases of two intermediate sequences, hmin(n) and hmax(n), can be computed, where hmin(n) is composed of the minimum phase parts of the AR and MA models, and hmax(n) of the corresponding maximum phase parts. Under the condition that the AR and MA models do not have common zeros, these two sequences can be estimated from their phases only, and lead to the reconstruction of the AR and MA parameters, within a scalar and a time shift. The AR and MA orders do not have to be estimated separately, but they are a byproduct of the parameter estimation procedure. Unlike existing methods, the estimation procedure is fairly robust if a small order mismatch occurs. Since the robustness of the method in the presence of additive noise depends on the accuracy of the estimated phases of hmin(n) and hmax(n), the phase errors occurring due to finite length data are studied.
{"title":"Noncausal Nonminimum Phase Arma Modeling Of Non-gaussian Processes","authors":"A. Petropulu","doi":"10.1109/SSAP.1994.572482","DOIUrl":"https://doi.org/10.1109/SSAP.1994.572482","url":null,"abstract":"A method is presented for the estimation of the parameters of a noncausal nonminimum phase ARMA model for non-Gaussian random processes. Using certain higher-order cepstra slices, the Fourier phases of two intermediate sequences, hmin(n) and hmax(n), can be computed, where hmin(n) is composed of the minimum phase parts of the AR and MA models, and hmax(n) of the corresponding maximum phase parts. Under the condition that the AR and MA models do not have common zeros, these two sequences can be estimated from their phases only, and lead to the reconstruction of the AR and MA parameters, within a scalar and a time shift. The AR and MA orders do not have to be estimated separately, but they are a byproduct of the parameter estimation procedure. Unlike existing methods, the estimation procedure is fairly robust if a small order mismatch occurs. Since the robustness of the method in the presence of additive noise depends on the accuracy of the estimated phases of hmin(n) and hmax(n), the phase errors occurring due to finite length data are studied.","PeriodicalId":151571,"journal":{"name":"IEEE Seventh SP Workshop on Statistical Signal and Array Processing","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1994-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129065879","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}
Pub Date : 1994-06-26DOI: 10.1109/SSAP.1994.572505
S. Narasimhan, J. Krolik
{"title":"A Cramer-Rao Bound for Source Range Estimation in a Random Ocean Waveguide","authors":"S. Narasimhan, J. Krolik","doi":"10.1109/SSAP.1994.572505","DOIUrl":"https://doi.org/10.1109/SSAP.1994.572505","url":null,"abstract":"","PeriodicalId":151571,"journal":{"name":"IEEE Seventh SP Workshop on Statistical Signal and Array Processing","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1994-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131689993","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}
Pub Date : 1994-06-26DOI: 10.1109/SSAP.1994.572453
K. Burgess, B. V. Van Veen
{"title":"Vector-Sensor Detection Using a Subspace GLRT","authors":"K. Burgess, B. V. Van Veen","doi":"10.1109/SSAP.1994.572453","DOIUrl":"https://doi.org/10.1109/SSAP.1994.572453","url":null,"abstract":"","PeriodicalId":151571,"journal":{"name":"IEEE Seventh SP Workshop on Statistical Signal and Array Processing","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1994-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126737942","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}
Pub Date : 1994-06-26DOI: 10.1109/SSAP.1994.572514
V. Ghazi-Moghadam, M. Kaveh
This paper addresses some practical issues in active array signal processing, such as signal design, calibration and algorithmically efficient processing for range and angle determination. First, the operation of an experimental ultrasound-in-air active sensing system is described, and the range and angle detection capabilities of the array are investigated. Then, the applications of CDMA-like techniques in a multisensor range detection system is demonstrated, and the performances of two types of codes are compared.
{"title":"Active Arrays for Robotics and Non-Destructive Testing","authors":"V. Ghazi-Moghadam, M. Kaveh","doi":"10.1109/SSAP.1994.572514","DOIUrl":"https://doi.org/10.1109/SSAP.1994.572514","url":null,"abstract":"This paper addresses some practical issues in active array signal processing, such as signal design, calibration and algorithmically efficient processing for range and angle determination. First, the operation of an experimental ultrasound-in-air active sensing system is described, and the range and angle detection capabilities of the array are investigated. Then, the applications of CDMA-like techniques in a multisensor range detection system is demonstrated, and the performances of two types of codes are compared.","PeriodicalId":151571,"journal":{"name":"IEEE Seventh SP Workshop on Statistical Signal and Array Processing","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1994-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126396142","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}
Pub Date : 1994-06-26DOI: 10.1109/SSAP.1994.572509
G. Zhou, G. Giannakis
The concern here is retrieval of single and multiple tone harmonics observed in white Gaussian multiplicative and additive noise. Computable Cramer-Rao bound (CRB) expressions are derived on the frequency and phase estimates as well as on the sample mean or variance of the multiplicative noise processes. The zero- and nonzero-mean multiplicative noise cases are addressed separately and are shown to yield distinct CRBs on the frequency and phase estimates. Tight lower and upper bounds on the CRBs themselves are developed, which, relative to the CRBs, are intuitively more appealing and easier to implement. Well-established formulas on the achievable accuracy for estimates of constant amplitude harmonics turn put to be special cases of our results. Numerical studies support our claims. >
{"title":"Harmonics in Gaussian Multiplicative and Additive Noise: Cramer-Rao Bounds","authors":"G. Zhou, G. Giannakis","doi":"10.1109/SSAP.1994.572509","DOIUrl":"https://doi.org/10.1109/SSAP.1994.572509","url":null,"abstract":"The concern here is retrieval of single and multiple tone harmonics observed in white Gaussian multiplicative and additive noise. Computable Cramer-Rao bound (CRB) expressions are derived on the frequency and phase estimates as well as on the sample mean or variance of the multiplicative noise processes. The zero- and nonzero-mean multiplicative noise cases are addressed separately and are shown to yield distinct CRBs on the frequency and phase estimates. Tight lower and upper bounds on the CRBs themselves are developed, which, relative to the CRBs, are intuitively more appealing and easier to implement. Well-established formulas on the achievable accuracy for estimates of constant amplitude harmonics turn put to be special cases of our results. Numerical studies support our claims. >","PeriodicalId":151571,"journal":{"name":"IEEE Seventh SP Workshop on Statistical Signal and Array Processing","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1994-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116064235","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}
Pub Date : 1994-06-26DOI: 10.1109/SSAP.1994.572463
P. Zetterberg, B. Ottersten
The goal of this paper is to obtain knowledge about spatial characteristics of the mobile channel seen through an antenna array. Particular interest is paid to the effect of local scattering. i.e large number of rays in the vicinity of the mobile.
{"title":"Experiments Using an Antenna Array in a Mobile Communications Environment","authors":"P. Zetterberg, B. Ottersten","doi":"10.1109/SSAP.1994.572463","DOIUrl":"https://doi.org/10.1109/SSAP.1994.572463","url":null,"abstract":"The goal of this paper is to obtain knowledge about spatial characteristics of the mobile channel seen through an antenna array. Particular interest is paid to the effect of local scattering. i.e large number of rays in the vicinity of the mobile.","PeriodicalId":151571,"journal":{"name":"IEEE Seventh SP Workshop on Statistical Signal and Array Processing","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1994-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116220141","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}
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