the proceedings contain 113 papers. the topics discussed include: a comparative study of blind channel identification methods for alamounti coded systems over indoor transmissions at 2.4 GHZ;rapid prototyping of a cos...
ISBN:
(纸本)9781424422418
the proceedings contain 113 papers. the topics discussed include: a comparative study of blind channel identification methods for alamounti coded systems over indoor transmissions at 2.4 GHZ;rapid prototyping of a cost effective and flexible 4×4 MIMO testbed;a low complexity decoding scheme for quasi-orthogonal space-time block coding;experimental investigation of polarization diversity;deterministic MIMO channel order estimation based on canonical correlation analysis;spectrum sharing in wireless networks: a QoS-aware secondary multicast approach with worst user performance optimization;optimality of multichannel beamforming for spatially correlated multiple-antenna Rayleigh fading channels with channel covariance information at transmitter;and comparison of the CAF-DF and SAGE algorithms in multiple channel parameter estimation.
this paper presents a novel synthetic aperture method, which can be used to reduce the average sidelobe level of a random spherical volumetric array. the technique exploits a general property of random arrays in which...
详细信息
ISBN:
(纸本)1424403081
this paper presents a novel synthetic aperture method, which can be used to reduce the average sidelobe level of a random spherical volumetric array. the technique exploits a general property of random arrays in which the average sidelobe level is inversely proportional to the number of elements present.
A multi-channel detector for narcotics and explosives using nuclear quadrupole resonance (NQR) is developed. Multiple measurement coils are used to estimate the radio frequency interference that is often present. the ...
详细信息
ISBN:
(纸本)1424403081
A multi-channel detector for narcotics and explosives using nuclear quadrupole resonance (NQR) is developed. Multiple measurement coils are used to estimate the radio frequency interference that is often present. the temperature dependency of the NQR frequencies is incorporated in the detector, allowing for uncertainties in the temperature estimate of the sample. In addition, the detector considers only the frequency bands of the signal of interest.
For a set of T independent N-variate Gaussian training samples (T < N), we derive a test for discriminating between stationary autoregressive models of order m, AR(m), and time-varying autoregressive models of orde...
详细信息
ISBN:
(纸本)1424403081
For a set of T independent N-variate Gaussian training samples (T < N), we derive a test for discriminating between stationary autoregressive models of order m, AR(m), and time-varying autoregressive models of order m, TVAR(m).
Conventional MUSIC (MUltiple signal Classification)rraethod, which is a well-known super-resolution technique that employs amonostatic configuration, degrades severely when themultiple targets are deterministic becaus...
详细信息
ISBN:
(纸本)1424403081
Conventional MUSIC (MUltiple signal Classification)rraethod, which is a well-known super-resolution technique that employs amonostatic configuration, degrades severely when themultiple targets are deterministic because the rank of the covariancematrix collapses to the value of one regardless of the number of targets. FRM (Frequency Response Matrix) [2, 7], with its multistatic configuration, is also a super-resolution technique and can complament, MUSIC in the target randomness spectrum. this paper demonstrates that conventional MUSIC performs better for targets with strongly random (complex) amplitudes and FRM performs better for target with weakly random amplitudes (best for deterministic amplitudes).
Source location accuracy can be dramatically degraded by the inaccuracy in the sensor positions. the sensor position errors need to be taken into account in order to improve the source location estimate. this paper pr...
详细信息
ISBN:
(纸本)1424403081
Source location accuracy can be dramatically degraded by the inaccuracy in the sensor positions. the sensor position errors need to be taken into account in order to improve the source location estimate. this paper presents an algorithm based on the Taylor-series technique to estimate the location of an emitting source in the presence of random sensor position errors, where the data measurements are angle-of-arrivals (AoAs). the proposed algorithm jointly estimates the source and sensor positions iteratively by using Taylor-series linearization. Simulation results indicate that the proposed method approaches the CRLB accuracy for both near-field and far-field sources.
We describe a method of tuning a simple detection process of stationary targets in SAR images. the tuning metric accounts for the squared-error performance of prescient estimators of target location and reflectivity. ...
详细信息
ISBN:
(纸本)1424403081
We describe a method of tuning a simple detection process of stationary targets in SAR images. the tuning metric accounts for the squared-error performance of prescient estimators of target location and reflectivity. the efficiencies of these prescient estimators are compared to their Cramer Rao bounds (CRBs). the off-line tuning is performed by collecting statistics of scatterer estimation in SAR images created using sparse-array spotlight mode simulations.
In this paper we propose an algorithm for angle and polarization estimation of non-coherent sources using real-world polarimetric antenna arrays. In order to construct an accurate model of an antenna array, we exploit...
详细信息
ISBN:
(纸本)1424403081
In this paper we propose an algorithm for angle and polarization estimation of non-coherent sources using real-world polarimetric antenna arrays. In order to construct an accurate model of an antenna array, we exploit its Effective Aperture Distribution Function (EADF). this model contains information on the array response for a vertical and horizontal excitation, the directional characteristic of each element, and array imperfections. Here, we propose a method stemming from the RARE (RAnk-Reduction Estimator) algorithm. It performs fast (search-free) DoAs and polarization coefficients estimation. throughout simulation results, we verify that the algorithm has close to optimal statistical performance with polarimetric real-world arrays. We present the statistical performance for three different array configurations.
For low frequency observations (< 300 MHz) the radio astronomical community is currently developing a number of new instruments such as the low frequency array (LOFAR), the Mileura wide field array (MWA) and the pr...
详细信息
ISBN:
(纸本)1424403081
For low frequency observations (< 300 MHz) the radio astronomical community is currently developing a number of new instruments such as the low frequency array (LOFAR), the Mileura wide field array (MWA) and the primeval structure telescope (PaST). these telescopes require new calibration algorithms since phased arrays require an all-sky approach to imaging and calibration. this implies that the calibration will generally have to deal with a multitude of sources. In this paper we will discuss a muldsource calibration method to estimate the gains and phases of the receiving elements without having to solve for the receiver noise powers at the same time. Our method is able to handle arbitrary known source models. We will show that the proposed algorithm is asymptotically efficient by comparing the results from Monte Carlo simulations withthe Craimer-Rao bound for the underlying data model.
the resolving ambiguity of phase interferometer is necessary when the baseline separation between elements exceeds half wavelength since the phase difference between elements can only be measured modulo 2 pi. It is di...
详细信息
ISBN:
(纸本)1424403081
the resolving ambiguity of phase interferometer is necessary when the baseline separation between elements exceeds half wavelength since the phase difference between elements can only be measured modulo 2 pi. It is difficult to meet the condition the minimum distance between two antennas is less than half wavelength for avoiding ambiguity in wideband operation. In this paper, we propose a simple and efficient array design method which minimizes the probability of ambiguity. this method adapts NLA (nonuniform linear array) geometry. And there is no need to maintain the distance between antennas less than half wavelength. We also show some numerical examples and experimental results of the 2-D array prototype for airborne application.
暂无评论