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Adaptive beamforming for large arrays in satellite communications systems with dispersed coverage [PDF]
, 2011 Conventional multibeam satellite communications systems ensure coverage of wide areas through multiple fixed beams where all users inside a beam share the same bandwidth. We consider a new and more flexible system where each user is assigned his own beam,
Larue de Tournemine, Cécile +5 more
core +1 more source
Robust adaptive beamforming using a Bayesian steering vector error model [PDF]
, 2013 We propose a Bayesian approach to robust adaptive beamforming which entails considering the steering vector of interest as a random variable with some prior distribution.
Bidon, Stéphanie, Besson, Olivier
core +1 more source
Fast Adaptive Beamforming with Smart Antenna for Radio Frequency Repeater
MATEC Web of Conferences, 2016 We present a fast adaptive beamforming null algorithm with smart antenna for Radio Frequency Repeater (RFR). The smart antenna system is realized by a Direction Of Arrival (DOA) Estimator, whose output is used by an adaptive beamforming algorithm to ...
Wang Chaoqun, Wei Guohua, Wang Teng
doaj +1 more source
Engineering Science and Technology, an International Journal, 2021 Ultrasound imaging is a largely used medical imaging system as it is safe, non-invasive, and capable of real-time imaging. In ultrasound imaging, different beamforming methods are used to obtain the image of the field of view.
Mayur Agarwal +2 more
doaj +1 more source
Nearfield broadband adaptive beamforming [PDF]
ISSPA '99. Proceedings of the Fifth International Symposium on Signal Processing and its Applications (IEEE Cat. No.99EX359), 2003 A nearfield broadband adaptive beamforming approach based on the modal expansion of the solution to the spherical wave equation is formulated. It provides an efficient parameterization for the nearfield beamforming problem with a single parameter to focus the beamformer to a desired operating radius and a set of modal coefficients to control the ...
Thushara D. Abhayapala +3 more
openaire +1 more source
Sensors, 2011 This paper presents an acoustic noise cancelling technique using an inverse kepstrum system as an innovations-based whitening application for an adaptive finite impulse response (FIR) filter in beamforming structure.
Jinsoo Jeong
doaj +1 more source
Effect of signal to interference ratio on adaptive beamforming techniques
Journal of King Saud University: Engineering Sciences, 2018 The capability of adaptive antenna array lies in forming higher gain in the user directions and lower gain in the interferer directions. The technique used to produce such radiation pattern by calculating the excitation weights are called the adaptive ...
Smita Banerjee, Ved Vyas Dwivedi
doaj +1 more source
Broadband Beamforming Using the Least Square Method Improved via Adaptive Diagonal Loading [PDF]
Journal of Electromagnetic Engineering and Science, 2023 The least square method (LSM) is a commonly used beamforming method. However, it limits the beamforming frequency bandwidth and is vulnerable to noise; therefore, diagonal loading is used to overcome these limitations.
Euiho Shin +4 more
doaj +1 more source
Multi-Rank Adaptive Beamforming
IEEE/SP 13th Workshop on Statistical Signal Processing, 2005, 2005 This paper presents a multi-rank generalization of the Capon beamformer to accommodate model mismatch in situations where the unknown signal of interest lies in a multidimensional subspace. By expanding the beamforming subspace robustness (or diversity) is achieved at the expense of resolution.
Scharf, Louis L. +2 more
openaire +3 more sources
Adaptive beamforming for photoacoustic imaging [PDF]
Optics Letters, 2008 An adaptive photoacoustic image reconstruction technique that combines coherence factor (CF) weighting and the minimum variance (MV) method is introduced. The backprojection method is widely used to reconstruct photoacoustic tomography images. Owing to the scattering of light, the quality of the photoacoustic imaging can be degraded.
Suhyun, Park +3 more
openaire +2 more sources