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Transformations for nonideal uniform circular arrays operating in correlated signal environments

Buon Kiong Lau, Yee, Yanqun Liu, Kok Lay Teo
2006 IEEE Transactions on Signal Processing  
As such, it allows techniques such as spatial smoothing for direction-of-arrival (DOA) estimation in a correlated signal environment, developed originally for uniform linear arrays, to be applied to UCAs  ...  Index Terms-Correlated signals, direction-of-arrival (DOA) estimation, quadratic semi-infinite programming, robustness, uniform circular arrays (UCAs).  ...  Transformations for Nonideal Uniform Circular Arrays Operating in Correlated Signal Environments steering vector has a Vandermonde structure. The steering vector of a UCA is not Vandermonde.  ... 
doi:10.1109/tsp.2005.861104 fatcat:icjp72kiifawtdmt647cwmpsqq

Mutual Coupling in Phased Arrays: A Review

Hema Singh, H. L. Sneha, R. M. Jha
2013 International Journal of Antennas and Propagation  
Researchers have proposed several techniques and designs for optimal performance of phased array in a given signal environment, counteracting the coupling effect.  ...  The techniques for optimization of the antenna characteristics in the presence of coupling are also included.  ...  A preprocessing technique for accurate DOA estimation in coherent signal environment was proposed for uniform circular array [43] .  ... 
doi:10.1155/2013/348123 fatcat:yvfgh6q3wvbjfkelc2qzxywpbi

Spatial Noise-Field Control With Online Secondary Path Modeling: A Wave-Domain Approach

Wen Zhang, Christian Hofmann, Michael Buerger, Thushara Dheemantha Abhayapala, Walter Kellermann
2018 IEEE/ACM Transactions on Audio Speech and Language Processing  
The proposed wave-domain secondary path model is applicable to both concentric and non-concentric circular loudspeaker and microphone array placement and is also robust against array positioning errors  ...  This paper proposes a wave-domain adaptation algorithm for multichannel ANC with online secondary path modelling to cancel tonal noise over an extended region of 2D plane in a reverberant room.  ...  Uniform circular arrays of loudspeakers (blue) and microphones (red) are placed on a 2D plane for noise cancellation within the shaded region.  ... 
doi:10.1109/taslp.2018.2864577 fatcat:yb5jfmr2lvgbpplqzexee6lwxy

Channel Modelling for Multiprobe Over-the-Air MIMO Testing

Pekka Kyösti, Tommi Jämsä, Jukka-Pekka Nuutinen
2012 International Journal of Antennas and Propagation  
We introduce two novel methods to generate fading emulator channel coefficients; the prefaded signals synthesis and the plane wave synthesis.  ...  We also show that the geometric description is a prerequisite for the original channel model.  ...  Acknowledgments The research was partly conducted in the framework the CELTIC Project CP5-026 WINNER+ and partly of a research project, abbreviated MIMOTA, funded by the Finnish Funding Agency for Technology  ... 
doi:10.1155/2012/615954 fatcat:4k5wty74vjcdreaymedsexunv4

Signal Processing and Propagation for Aeroacoustic Sensor Networks [chapter]

Richard Kozick, Brian Sadler, D Wilson
2012 Distributed Sensor Networks, Second Edition  
Their algorithm exploits the Toeplitz structure of the B matrix in (42) for a uniform linear array (ULA).  ...  Models for measured sensor signals In this section, we present a model for the signals received by the sensors in a microphone array.  ... 
doi:10.1201/b12991-15 fatcat:qlqrfdcitbhcvlark6awtwreke

Filter-based coded-excitation system for high-speed ultrasonic imaging

Jian Shen, E.S. Ebbini
1998 IEEE Transactions on Medical Imaging  
Image reconstruction in ROI is achieved with a regularized pseudoinverse operator derived from the linear receive signal model.  ...  Experimental results have shown that the new approach is valid for phased-array pulse-echo imaging of speckle-generating phantoms typically used in characterizing medical imaging systems.  ...  Lucas for the helpful discussions and comments. They would also like to thank Dr. M. Karaman for collecting the phantom data.  ... 
doi:10.1109/42.746625 pmid:10048849 pmcid:PMC2844505 fatcat:hol6gwfrxrhexf4sbzeyxtv6qe

Application of antenna arrays to mobile communications. II. Beam-forming and direction-of-arrival considerations

L.C. Godara
1997 Proceedings of the IEEE  
of an array system for mobile communications is considered.  ...  Array processing involves manipulation of signals induced on various antenna elements.  ...  Two methods using uniform circular arrays are presented in [350] that extend beam-space MUSIC and ESPRIT algorithms (to be discussed in Section IV-J) for two-dimensional angle estimation, including an  ... 
doi:10.1109/5.622504 fatcat:nuokeqqm5vhaxkw7t5inlrkxlq

Virtual channel space-time processing with dual-polarization discrete lens antenna arrays

Yan Zhou, S. Rondineau, D. Popovic, A. Sayeed, Z. Popovic
2005 IEEE Transactions on Antennas and Propagation  
In particular, the paper examines: 1) effects of cross-polarization for a dual-polarized multibeam array; 2) effects of beam overlap in a multibeam array; and 3) effects of gain variations for different  ...  It is first shown that optimal signaling over multiantenna channels via virtual spatial models (VSMs) has a direct hardware correspondence in a multibeam spatially fed antenna architecture.  ...  The recently introduced Virtual Channel Representation for uniform linear arrays (ULAs)  ... 
doi:10.1109/tap.2005.852518 fatcat:cjim3xmnxzfhzps6afzeyfl7ly

MIMO Wireless Channel Modeling and Experimental Characterization [chapter]

Michael A. Jensen, Jon W. Wallace
2005 Space-Time Processing for MIMO Communications  
Therefore, we will highlight techniques for including these channel aspects in MIMO system characterization and will  ...  When evaluating the results of these modeling and measurement campaigns, much of the discussion will focus on the pertinent properties of the propagation environment.  ...  For example, in something like a forested environment the scatterers might be placed according to a uniform distribution in angle around the ring.  ... 
doi:10.1002/0470010045.ch1 fatcat:26wi2adch5hcdb3z7jyr77o4ey

Environmental Effects [chapter]

David Swanson
2012 Distributed Sensor Networks, Second Edition  
for many helpful discussions on beamforming in random media.  ...  Acknowledgments We thank Tien Pham of the Army Research Laboratory for contributions to the wideband AOA estimation material in this chapter, and we thank Sandra Collier of the Army Research Laboratory  ...  For example, the array manifold interpolation (AMI) method of Doron et al. [51] was tested experimentally and via simulation using a 12-element uniform circular array.  ... 
doi:10.1201/b12991-13 fatcat:4js7hxigpjg6jooxejteibof6y

Massively Parallel Amplitude-Only Fourier Neural Network [article]

Mario Miscuglio, Zibo Hu, Shurui Li, Jonathan George, Roberto Capanna, Philippe M. Bardet, Puneet Gupta, Volker J. Sorger
2020 arXiv   pre-print
optical processors for machine-intelligence.  ...  the Fourier domain reaching peta operations per second throughputs.  ...  Using the analogue MOEMS, for spatially modulating the optical signal, in combination with the ultra-high-speed camera (MHz, >4K resolution), for converting the filtered signal in the electric domain,  ... 
arXiv:2008.05853v2 fatcat:jghonjlavna4xa72xvbxtbcjhy

Dynamic Reconstruction

Berthold K. P. Horn, Richard C. Lanza, Jayna T. Bell, Gordon E. Kohse
2010 IEEE Transactions on Nuclear Science  
Dynamic reconstruction is a method for generating images or image sequences from data obtained using moving radiation detection systems.  ...  Dynamic reconstruction provides for recovery of depth, and has sensitivity that drops off with the inverse of distance rather than the inverse square of distance.  ...  Correlation may be implemented directly or by multiplication in the Fourier transform domain.  ... 
doi:10.1109/tns.2009.2032544 fatcat:qh72wf2rlrgdln4zaw6yfoqezq

Antenna Array for Passive Radar: Configuration Design and Adaptive Approaches to Disturbance Cancellation

Michelangelo Villano, Fabiola Colone, Pierfrancesco Lombardo
2013 International Journal of Antennas and Propagation  
We consider the selection of an antenna array configuration, composed of a small number of omnidirectional elements, to be exploited for passive radar sensors.  ...  Based on properly identified pattern characteristics and design criteria for practical applications, a suitable planar configuration is selected that allows both angular selectivity and direct signal attenuation  ...  due to nonidealities of array elements, minor errors in array geometry, and nearby obstacles that cannot be taken into account at the design stage but should be measured and compensated for after its  ... 
doi:10.1155/2013/920639 fatcat:unj5j4xtb5fpdd34ra5qmyiibu

Sparse Symmetric Linear Arrays with Low Redundancy and a Contiguous Sum Co-Array

Robin Rajamaki, Visa Koivunen
2021 IEEE Transactions on Signal Processing  
Thank you for your kind hospitality. Last but not least, I would like to thank my friends and family for providing refreshing (and likely much-needed) distractions from academic life.  ...  Many thanks to my parents for always supporting and encouraging me. Thanks to my grandparents, to whom I am indebted for the privilege of pursuing higher education wholeheartedly and carefreely.  ...  The uniform structure of the co-array shares many of the advantages of a uniform physical array, such as amenability to theoretical analysis, convenient matrix structures in the signal model, and simplified  ... 
doi:10.1109/tsp.2021.3057982 fatcat:tynhsuefnve4fmnnmyhm5rc2da

A High-Precision Algorithm for DOA Estimation Using a Long-Baseline Array Based on the Hearing Mechanism of the Ormia Ochracea

Jiazhi He, Zhen Huang, Xuefeng Feng
2022 Sensors  
In this paper, we regard this coupled structure as a multi-input multi-output filter, where coupling exists between each pair of array elements.  ...  Inspired by the Ormia Ochracea hearing mechanism, a new direction of arrival estimation using multiple antenna arrays has been considered in spatially colored noise fields.  ...  We extend our analysis to the uniform circular antenna array (UCA) in Section 6 as well.  ... 
doi:10.3390/s22031249 pmid:35161994 pmcid:PMC8839033 fatcat:zy5amppr6nfwliqzce2dnz6gnu
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