The proceedings contain 86 papers. The topics discussed include: sparse array and precoding design for integrated sensing and communications systems;geometry-aided near-field MIMO communications via forward-backward b...
ISBN:
(纸本)9798350344813
The proceedings contain 86 papers. The topics discussed include: sparse array and precoding design for integrated sensing and communications systems;geometry-aided near-field MIMO communications via forward-backward beamformer training;a decentralized asynchronous optimization algorithm with an application to phase retrieval;DynaPA: dynamic power allocation for improved exploration-exploitation in active sensing;receiver antenna allocation for joint sensing and communications;labeling sequential data from noisy annotations;calibration of polarimetric antenna arrays using neural networks;variable selection for Max-Affine regression via sparse gradient descent;experimental evaluation of a null-steered performance weighted blended beamformer;and distributed sparse subspace clustering by k-means subspace fusion.
This paper derives the Haar measure over the set of unitary matrices. The Haar measure is essential when studying the statistical behavior of complex sample covariance matrices in terms of their eigenvalues and eigenv...
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ISBN:
(纸本)0780385454
This paper derives the Haar measure over the set of unitary matrices. The Haar measure is essential when studying the statistical behavior of complex sample covariance matrices in terms of their eigenvalues and eigenvectors. The characterization is based on Murnaghans parameterization of unitary matrices which can be seen as a generalization of the representation of orthogonal matrices using Givens rotations. In addition to deriving the Haar measure, an efficient method to obtain samples from it is also presented.
We introduce a new class of distributions called generalized complex elliptically symmetric distributions. Several distributions commonly used in the literature, for example, the multivariate complex normal and Cauchy...
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ISBN:
(纸本)0780385454
We introduce a new class of distributions called generalized complex elliptically symmetric distributions. Several distributions commonly used in the literature, for example, the multivariate complex normal and Cauchy and the generalized complex normal distribution, are prominent members of this class. The treatment covers both proper and improper random vectors and goes beyond second-order concepts in defining the distribution model. Some properties of these distributions are Studied and illustrative examples of their applications in multichannelsignalprocessing are presented such as tests for circularity.
This paper is concerned with a new accelerated RLS adaptive beamforming algorithm applied to fast moving mobile terminals. The proposed algorithm is based on the internal model principle by approximately expressing th...
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ISBN:
(纸本)0780385454
This paper is concerned with a new accelerated RLS adaptive beamforming algorithm applied to fast moving mobile terminals. The proposed algorithm is based on the internal model principle by approximately expressing the parameter changes in terms of polynomial time functions, and can rapidly track the multipath fading environment. We show that the amount of calculation of the proposed algorithm is almost the same as that of the ordinary RLS adaptive beamforming, and its effectiveness is examined in numerical simulations.
This paper extends the Extended Kalman Filter (EKF) to cover those scenarios in which the input signal is unknown and quadratic processing is required to estimate and track some parameters of interest. The optimal qua...
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ISBN:
(纸本)0780385454
This paper extends the Extended Kalman Filter (EKF) to cover those scenarios in which the input signal is unknown and quadratic processing is required to estimate and track some parameters of interest. The optimal quadratic tracker is found to incorporate the fourth-order statistical knowledge about the excitation signal. To illustrate these conclusions, we have studied the problem of direction-of-arrival (DOA) tracking of digitally-modulated signals. Simulations have reflected the advantage of considering this information in terms of acquisition and steady-state performance.
In presence of general array error in a uniform circular arrays (UCAs), estimation of azimuth and elevation for a Source is proposed. Based on array manifold in UCAs, the spatial frequency that is related to DOA is ga...
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ISBN:
(纸本)0780385454
In presence of general array error in a uniform circular arrays (UCAs), estimation of azimuth and elevation for a Source is proposed. Based on array manifold in UCAs, the spatial frequency that is related to DOA is gained and theoretical expression for its asymptotic variance and the Cramer-Rao Bound (CRB) of estimation is derived. The ambiguous problem is analyzed. The azimuth and elevation of source are estimated by Weight Total Least Squares. The results of simulation show that the performance of the estimation is close to the CRB.
We present a definition of a dual-frequency dual-wavenumber cross-spectrum of two nonstationary and inhomogeneous harmonizable random fields, which is in fact a generalization of the Loeve (dual-frequency) cross-spect...
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ISBN:
(纸本)0780385454
We present a definition of a dual-frequency dual-wavenumber cross-spectrum of two nonstationary and inhomogeneous harmonizable random fields, which is in fact a generalization of the Loeve (dual-frequency) cross-spectrum of two random processes. Furthermore, a geometric argument shows that a proper normalization yields a natural measure of cross-coherence, and application of the Cauchy-Schwarz inequality results in a necessary and sufficient condition for full cross-coherence. Finally, estimators of the cross-spectrum and the cross-coherence based on the multitaper approach are suggested, and tested on synthetic arrayprocessing data.
In this paper we evaluate the performance of a Tripole array for estimation of the polarization and one dimensional direction of arrival (DOA). We employ a model based on far-field calculations of a Tripole antenna an...
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ISBN:
(纸本)0780385454
In this paper we evaluate the performance of a Tripole array for estimation of the polarization and one dimensional direction of arrival (DOA). We employ a model based on far-field calculations of a Tripole antenna and completely polarized electromagnetic waves carrying Gaussian distributed signals. The analysis of the performance is based on calculations of the Cramer-Rao Lower Bound (CRLB) for the polarization and DOA estimators. It is seen that the Tripole array is suitable for polarization estimation with or without knowledge of the DOA. It is also seen that the quality of the DOA estimate depends strongly on the polarization state.
In this paper, we propose a method for estimating the number of sources based on the eigenvectors of the covariance matrix of a narrowband array. The proposed method provides the same detection sensitivity as AIC and ...
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ISBN:
(纸本)0780385454
In this paper, we propose a method for estimating the number of sources based on the eigenvectors of the covariance matrix of a narrowband array. The proposed method provides the same detection sensitivity as AIC and MDL, but appears to be much more robust to signal and noise model perturbations. Unlike AIC and MDL that do not make use of the procedure used in calibrating the antenna array, the proposed method can use the calibrated antenna responses to take into account the existing nonidealities present in the antenna array, and hence outperforming AIC and MDL methods in practice.
Recently, a maximum likelihood estimate has been proposed for road vehicle speed based on two onmidirectional microphones. We undertake a broadband analysis in a stochastic setting in order to expose the effect of inp...
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ISBN:
(纸本)0780385454
Recently, a maximum likelihood estimate has been proposed for road vehicle speed based on two onmidirectional microphones. We undertake a broadband analysis in a stochastic setting in order to expose the effect of input SNR, target speed, bandwidth, and observation time in the SNR at the output of the modified crosscorrelator on which the estimate is based. The use of 1-bit quantized signals, which provides an important hardware simplification, is also considered and seen to result in mild performance degradation.
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