Search Results - "Almeida, F L"

Detection of the cyanomidyl radical (HNCN): a new interstellar species with the NCN backbone by Rivilla, V M, Jiménez-Serra, I, García de la Concepción, J, Martín-Pintado, J, Colzi, L, Rodríguez-Almeida, L F, Tercero, B, Rico-Villas, F, Zeng, S, Martín, S, Requena-Torres, M A, de Vicente, P

“…ABSTRACT We report here the first detection in the interstellar medium of the cyanomidyl radical (HNCN). Using the Yebes 40m and the IRAM 30m telescopes, we…”
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Tensor decompositions, alternating least squares and other tales by Comon, P., Luciani, X., de Almeida, A. L. F.

“…This work was originally motivated by a classification of tensors proposed by Richard Harshman. In particular, we focus on simple and multiple ‘bottlenecks’,…”
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Semi-Blind Receivers for Two-Hop MIMO Relay Systems with a Combined TSTF-MSMKron Coding by de Pinho, Pablo H U, Couras, Maria de F K B, Favier, Gérard, de Almeida, André L F, da Costa, João Paulo J

“…Due to the increase in the number of mobile stations in recent years, cooperative relaying systems have emerged as a promising technique for improving the…”
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Semi-Blind Joint Channel and Symbol Estimation for IRS-Assisted MIMO Systems by Araujo, Gilderlan T. de, Almeida, Andre L. F. de, Boyer, Remy, Fodor, Gabor

“…Intelligent reflecting surface (IRS) is a promising technology for the <inline-formula><tex-math notation="LaTeX">6^\mathrm{th}</tex-math></inline-formula>…”
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Channel Estimation in RIS-Assisted MIMO Systems Operating Under Imperfections by Gomes, Paulo R. B., Araujo, Gilderlan T. de, Sokal, Bruno, Almeida, Andre L. F. de, Makki, Behrooz, Fodor, Gabor

“…The promising gains of reconfigurable intelligent surface (RIS)-assisted multiple-input multiple-output (MIMO) systems, in terms of extended coverage and…”
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PARAFAC-PARATUCK Semi-Blind Receivers for Two-Hop Cooperative MIMO Relay Systems by Ximenes, Leandro R., Favier, Gerard, de Almeida, Andre L. F., Silva, Yuri C. B.

“…In two-hop amplify-and-forward (AF) relay systems, a source node sends information to one or several relay nodes that amplify and retransmit the received…”
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Using tensor contractions to derive the structure of slice-wise multiplications of tensors with applications to space–time Khatri–Rao coding for MIMO-OFDM systems by Naskovska, Kristina, Sokal, Bruno, de Almeida, André L. F., Haardt, Martin

“…The slice-wise multiplication of two tensors is required in a variety of tensor decompositions (including PARAFAC2 and PARATUCK2) and is encountered in many…”
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Tensor Space-Time-Frequency Coding With Semi-Blind Receivers for MIMO Wireless Communication Systems by Favier, Gerard, de Almeida, Andre L. F.

“…In this paper, we first introduce two new classes of constrained tensor models that we call generalized PARATUCK- (N1, N) and Tucker- (N1, N) models. A new…”
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Channel Estimation for Intelligent Reflecting Surface Assisted MIMO Systems: A Tensor Modeling Approach by de Araujo, Gilderlan T., de Almeida, Andre L. F., Boyer, Remy

“…Intelligent reflecting surface (IRS) is an emerging technology for future wireless communications including 5G and especially 6G. It consists of a large 2D…”
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Tensor-Based Subspace Tracking for Time-Delay Estimation in GNSS Multi-Antenna Receivers by Garcez, Caio C R, de Lima, Daniel Valle, Miranda, Ricardo Kehrle, Mendonça, Fábio, da Costa, João Paulo C L, de Almeida, André L F, de Sousa, Jr, Rafael T

“…Although Global Navigation Satellite Systems (GNSS) receivers currently achieve high accuracy when processing their geographic location under line of sight…”
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Space-Time-Frequency (STF) MIMO Communication Systems With Blind Receiver Based on a Generalized PARATUCK2 Model by de Almeida, André L. F., Favier, Gérard, Ximenes, Leandro R.

“…In this paper, we first propose a generalized fourth-order PARATUCK2 tensor model for multiple-input multiple-output (MIMO) communication systems with…”
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The Piwil1 N domain is required for germ cell survival in Atlantic salmon by F. L, Almeida, K. O, Skaftnesmo, E, Andersson, L, Kleppe, R. B, Edvardsen, B, Norberg, P. G, Fjelldal, T. J, Hansen, R. W, Schulz, A, Wargelius

“…Genetic introgression of farmed salmon into wild populations can damage the genetic integrity of wild stocks and is therefore considered as an environmental…”
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Semi-Blind Receivers for Joint Symbol and Channel Estimation in Space-Time-Frequency MIMO-OFDM Systems by Kefei Liu, da Costa, Joao Paulo C. L., So, H. C., de Almeida, Andre L. F.

“…In wireless communications, increased spectral efficiency and low error rates can be achieved by means of space-time-frequency coded MIMO-OFDM systems. In this…”
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Overview of constrained PARAFAC models by Favier, Gérard, de Almeida, André LF

“…In this paper, we present an overview of constrained parallel factor (PARAFAC) models where the constraints model linear dependencies among columns of the…”
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CONFAC Decomposition Approach to Blind Identification of Underdetermined Mixtures Based on Generating Function Derivatives by de Almeida, A. L. F., Luciani, X., Stegeman, A., Comon, P.

“…This work proposes a new tensor-based approach to solve the problem of blind identification of underdetermined mixtures of complex-valued sources exploiting…”
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Blind Identification of Underdetermined Mixtures Based on the Characteristic Function: The Complex Case by Luciani, X, de Almeida, A L F, Comon, P

“…Blind identification of underdetermined mixtures can be addressed efficiently by using the second ChAracteristic Function (CAF) of the observations. Our…”
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Coarray Tensor Completion for DOA Estimation by Zheng, Hang, Shi, Zhiguo, Zhou, Chengwei, de Almeida, Andre L. F.

“…Sparse array direction-of-arrival (DOA) estimation using tensor model has been developed to handle multi-dimensional sub-Nyquist sampled signals. Furthermore,…”
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Early puberty of farmed tambaqui (Colossoma macropomum): Possible influence of male sexual maturation on harvest weight by Almeida, F.L., Lopes, J.S., Crescencio, R., Izel, A.C.U., Chagas, E.C., Boijink, C.

“…Tambaqui is the main native fresh water fish in Brazilian aquaculture. Despite the increasing production of tambaqui (annual growth of approximately 8%), no…”
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MIMO Array Capacity Optimization Using a Genetic Algorithm by Binelo, M. O., de Almeida, A. L. F., Cavalcanti, F. R. P.

“…This paper discusses the design of multiple-input-multiple-output (MIMO) antenna systems and proposes a genetic algorithm to obtain the position and…”
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Reducing the Control Overhead of Intelligent Reconfigurable Surfaces Via a Tensor-Based Low-Rank Factorization Approach by Sokal, Bruno, Gomes, Paulo R. B., De Almeida, Andre L. F., Makki, Behrooz, Fodor, Gabor

“…Intelligent reconfigurable surfaces (IRS) are becoming an attractive component of cellular networks due to their ability to shape the propagation environment…”
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