چکیده: در این مقاله، مسئله­ طراحی شکل­موج به منظور تخمین پارامترهای تأخیر و داپلر هدف، بر اساس معیار [i]crb بررسی می­شود. پس از به دست آوردن حدود crb، از مدل سیگنال ofdm برای طراحی شکل­موج استفاده می­شود و با حداقل کردن این حدود دو شکـل­مـوج طراحی می­شود. کارآیی شکل­موج­ها نیز با استفاده از تابع ابهام متقابل(caf[ii])، مورد بررسی قرار گرفته و برای ارزیابی دقیق­تر از پـارامتر mf[iii] استفـاده می­...

The problem of design and placing pilot symbols for the estimation of frequency selective random channels is considered. For both SISO and MIMO channels, the Cramér-Rao Bound (CRB) on the mean square error of channel estimators is derived and minimized with respect to the pilot symbols and their placement. It is shown that placing pilot symbols, possibly in multiple clusters, in the middle of t...

Photometry and low-resolution spectroscopy have added V2552 Oph to the rare class of R Coronae Borealis variables. We confirm this classification of V2552 Oph through a comparison of our high-resolution optical spectrum of this star and that of R CrB and other F-type members of the class. We show that V2552 Oph most closely resembles Y Mus and FH Sct, stars in which Sr, Y, and Zr are enhanced. ...

In this contribution we consider the Cramer-Rao bound (CRB) for the estimation of the time delay of a noisy linearly modulated signal with random data symbols. In spite of the presence of the nuisance parameters (i.e., the random data symbols), we obtain a closed-form expression of this CRB for arbitrary PSK, QAM or PAM constellations and a bandlimited square-root Nyquist transmit pulse.

The goal of this contribution is to characterize the best achievable mean-squared error (MSE) in estimating a sparse deterministic parameter from measurements corrupted by Gaussian noise. To this end, an appropriate definition of bias in the sparse setting is developed, and the constrained Cramér–Rao bound (CRB) is obtained. This bound is shown to equal the CRB of an estimator with knowledge of...

intendent's headquarters, elev. 3000 to 3300 ft., David Kaye 2, 3, in 1932 (CRB, UC). Copper River Region, trailing, 2.5 inches high, common in high tundra, West Fork of Eagle Creek, alt. 4500 ft., Wm. L. Pope 160, Aug. 22, 1902 (USN). Kadiak Id.: Kadiak, L. J. Cole, July 1, 1899 (USN); Coville and Kearney 2312, July 20, 1899 (USN); C. V. Piper 4592, July 28, 1904 (CRB, USN). Kadiak Mountain, F...

A Cramer-Rao bound (CRB) study is developed to characterize the information content about scattering parameters that is contained in reflective (R), transmissive (T), and combined R plus T wave scattering data. The analysis is developed for scalar wave scattering systems in onedimensional space, paying particular attention to elastic scatterers, which simplifies the signal model (relative to mo...

Herein, a novel eigenstructure-based method for direction estimation is presented. The method assumes that the emitter signals are uncorrelated. Ideas from subspace and covariance matching methods are combined to yield a non-iterative estimation algorithm when a uniform linear array is employed. The large sample performance of the estimator is analyzed. It is shown that the asymptotic variance ...

In many practical parameter estimation problems, a model selection is made prior to estimation. In this paper, we consider the problem of estimating an unknown parameter of a selected population, where the population is chosen from a population set by using a predetermined selection rule. Since the selection step may have an important impact on subsequent estimation, ignoring it could lead to b...

The Canonical Polyadic tensor decomposition (CPD), also known as Candecomp/Parafac, is very useful in numerous scientific disciplines. Structured CPDs, i.e. with Toeplitz, circulant, or Hankel factor matrices, are often encountered in signal processing applications. As subsequently pointed out, specialized algorithms were recently proposed for estimating the deterministic parameters of structur...