Coding and modulation for the Gaussian channel, in the absence or in the presence of fluctuations. - Gerard Battail; Hélio Magalhães de Oliveira; Weidong Zhang (EUROCODE, 1990)

On Lattice Coding for the Gaussian Channel. - Hélio Magalhães de Oliveira; Gerard Battail (Eur. Trans. Telecommun., 1993)

How to interpolate in arithmetic transform algorithms. - Renato J. Cintra; Hélio M. de Oliveira (ICASSP, 2002)

Faster DTMF Decoding. - Juliano B. Lima; Ricardo M. Campello de Souza; Hélio M. de Oliveira; M. M. Campello de Souza (ICT, 2004)

The Genetic Code Revisited: Inner-to-Outer Map, 2D-Gray Map, and World-Map Genetic Representations. - Hélio M. de Oliveira; N. S. Santos-Magalhães (ICT, 2004)

The Discrete Cosine Transform over Prime Finite Fields. - M. M. Campello de Souza; Hélio M. de Oliveira; Ricardo M. Campello de Souza; M. M. Vasconcelos (ICT, 2004)

Elliptic-cylindrical wavelets: the Mathieu wavelets. - M. M. S. Lira; Hélio Magalhães de Oliveira; Renato J. Cintra (IEEE Signal Process. Lett., 2004)

Converting ECG and Other Paper Legated Biomedical Maps into Digital Signals. - André R. Gomes e Silva; Hélio Magalhães de Oliveira; Rafael Dueire Lins (GREC, 2007)

Fragile watermarking using finite field trigonometrical transforms. - Renato J. Cintra; Vassil S. Dimitrov; Hélio M. de Oliveira; Ricardo M. Campello de Souza (Signal Process. Image Commun., 2009)

Matrix expansions for computing the discrete hartley transform for blocklength N ≡ 0 (mod 4). - R. C. de Oliveira; Ricardo M. Campello de Souza; Hélio M. de Oliveira (LATINCOM, 2012)

Application of Enhanced-2D-CWT in Topographic Images for Mapping Landslide Risk Areas. - Victor Vermehren Valenzuela; Rafael Dueire Lins; Hélio Magalhães de Oliveira (ICIAR, 2013)

Quantum Decoding with Venn Diagrams. - C. M. F. Barros; Francisco Marcos de Assis; Hélio M. de Oliveira (CoRR, 2015)

Genomic Imaging Based on Codongrams and a^2grams. - E. A. Bouton; Hélio M. de Oliveira; Ricardo M. Campello de Souza; N. S. Santos-Magalhães (CoRR, 2015)

A Low-throughput Wavelet-based Steganography Audio Scheme. - P. Carrion; Hélio M. de Oliveira; Ricardo M. Campello de Souza (CoRR, 2015)

A Short Survey on Arithmetic Transforms and the Arithmetic Hartley Transform. - Renato J. Cintra; Hélio M. de Oliveira (CoRR, 2015)

A Full Frequency Masking Vocoder for Legal Eavesdropping Conversation Recording. - R. F. B. Sotero Filho; Hélio M. de Oliveira; Ricardo M. Campello de Souza (CoRR, 2015)

Compactly Supported Wavelets Derived From Legendre Polynomials: Spherical Harmonic Wavelets. - M. M. S. Lira; Hélio M. de Oliveira; M. A. Carvalho Jr.; Ricardo M. Campello de Souza (CoRR, 2015)

Wavelets for Elliptical Waveguide Problems. - M. M. S. Lira; Hélio M. de Oliveira; Renato J. Cintra; Ricardo M. Campello de Souza (CoRR, 2015)

A Fingerprint-based Access Control using Principal Component Analysis and Edge Detection. - Ernande F. Melo; Hélio M. de Oliveira (CoRR, 2015)

On Galois-Division Multiple Access Systems: Figures of Merit and Performance Evaluation. - Joao Paulo C. L. Miranda; Hélio M. de Oliveira (CoRR, 2015)

Shannon and Renyi Entropy of Wavelets. - Hélio M. de Oliveira (CoRR, 2015)

The Adaptive Mean-Linkage Algorithm: A Bottom-Up Hierarchical Cluster Technique. - Hélio M. de Oliveira (CoRR, 2015)

Multiresolution Division Multiplex (MRDM): A New Wavelet-based Multiplex System. - Hélio M. de Oliveira; E. A. Bouton (CoRR, 2015)

Fourier Codes and Hartley Codes. - Hélio M. de Oliveira; C. M. F. Barros; Ricardo M. Campello de Souza (CoRR, 2015)

A Factorization Scheme for Some Discrete Hartley Transform Matrices. - Hélio M. de Oliveira; Renato J. Cintra; Ricardo M. Campello de Souza (CoRR, 2015)

Multilayer Hadamard Decomposition of Discrete Hartley Transforms. - Hélio M. de Oliveira; Renato J. Cintra; Ricardo M. Campello de Souza (CoRR, 2015)

On Wavelet Decomposition over Finite Fields. - Hélio M. de Oliveira; Tiago H. Falk (CoRR, 2015)

Taylor Series as Wide-sense Biorthogonal Wavelet Decomposition. - Hélio M. de Oliveira; Rafael Dueire Lins (CoRR, 2015)

Spread-Spectrum Based on Finite Field Fourier Transforms. - Hélio M. de Oliveira; Joao Paulo C. L. Miranda; Ricardo M. Campello de Souza (CoRR, 2015)

A Flexible Implementation of a Matrix Laurent Series-Based 16-Point Fast Fourier and Hartley Transforms. - R. C. de Oliveira; Hélio M. de Oliveira; Ricardo M. Campello de Souza; E. J. P. Santos (CoRR, 2015)

Simulation of Color Blindness and a Proposal for Using Google Glass as Color-correcting Tool. - Hélio M. de Oliveira; J. Ranhel; R. B. A. Alves (CoRR, 2015)

Wavelet Analysis as an Information Processing Technique. - Hélio M. de Oliveira; D. F. de Souza (CoRR, 2015)

Orthogonal Multilevel Spreading Sequence Design. - Hélio M. de Oliveira; Ricardo M. Campello de Souza (CoRR, 2015)

Radix-2 Fast Hartley Transform Revisited. - Hélio M. de Oliveira; Viviane L. Sousa; A. N. Helfarne; Ricardo M. Campello de Souza (CoRR, 2015)

Efficient Multiplex for Band-Limited Channels: Galois-Field Division Multiple Access. - Hélio M. de Oliveira; Ricardo M. Campello de Souza; A. N. Kauffman (CoRR, 2015)

A Matrix Laurent Series-based Fast Fourier Transform for Blocklengths N=4 (mod 8). - Hélio M. de Oliveira; Ricardo M. Campello de Souza; R. C. de Oliveira (CoRR, 2015)

Fast Finite Field Hartley Transforms Based on Hadamard Decomposition. - Hélio M. de Oliveira; R. G. F. Távora; Renato J. Cintra; Ricardo M. Campello de Souza (CoRR, 2015)

Implementation of an Automatic Syllabic Division Algorithm from Speech Files in Portuguese Language. - E. L. F. Da Silva; Hélio M. de Oliveira (CoRR, 2015)

New Algorithms for Computing a Single Component of the Discrete Fourier Transform. - Gilson Jerônimo da Silva Jr.; Ricardo M. Campello de Souza; Hélio M. de Oliveira (CoRR, 2015)

Fault Analysis Using Gegenbauer Multiresolution Analysis. - Luciana R. Soares; Hélio M. de Oliveira (CoRR, 2015)

Fourier Codes. - Ricardo M. Campello de Souza; Eduarda S. V. Freire 002; Hélio M. de Oliveira (CoRR, 2015)

The Hartley Transform in a Finite Field. - Ricardo M. Campello de Souza; Hélio M. de Oliveira; A. N. Kauffman (CoRR, 2015)

The Z Transform over Finite Fields. - Ricardo M. Campello de Souza; Hélio M. de Oliveira; Danilo Silva 001 (CoRR, 2015)

Close Approximations for Daublets and their Spectra. - Victor Vermehren Valenzuela; J. E. Wesen; Hélio M. de Oliveira (CoRR, 2015)

Performance Assessment of WhatsApp and IMO on Android Operating System (Lollipop and KitKat) during VoIP calls using 3G or WiFi. - R. C. de Oliveira; Hélio Magalhães de Oliveira; R. A. Ramalho; L. P. S. Viana (CoRR, 2016)

A New Information Theoretical Concept: Information-Weighted Heavy-tailed Distributions. - Hélio M. de Oliveira; Renato J. Cintra (CoRR, 2016)

Understanding MIDI: A Painless Tutorial on Midi Format. - Hélio Magalhães de Oliveira; R. C. de Oliveira (CoRR, 2017)

Multiuser Communication Based on the DFT Eigenstructure. - Ricardo M. Campello de Souza; Hélio M. de Oliveira; Renato J. Cintra (CoRR, 2017)

Linear Computer-Music through Sequences over Galois Fields. - Hélio Magalhães de Oliveira; R. C. de Oliveira (CoRR, 2017)

The Hamming and Golay Number-Theoretic Transforms. - A. J. A. Paschoal; R. M. Campello de Souza; Hélio M. de Oliveira (CoRR, 2018)

von Mises Tapering: A Circular Data Windowing. - Hélio M. de Oliveira; Francisco Cháves (CoRR, 2018)

A Note on the Shannon Entropy of Short Sequences. - Hélio M. de Oliveira; Raydonal Ospina (CoRR, 2018)

ND-Wavelets Derived from Anti-symmetric Systems of Isolated Particles using the Determinant of Slater. - Hélio M. de Oliveira; Victor Vermehren Valenzuela (CoRR, 2019)

An Overview of Self-Similar Traffic: Its Implications in the Network Design. - Ernande F. Melo; Hélio Magalhães de Oliveira (CoRR, 2020)

Multidimensional Wavelets for Scalable Image Decomposition: Orbital Wavelets. - Hélio M. de Oliveira; Victor Vermehren Valenzuela; Renato J. Cintra (CoRR, 2020)

Infinite Sequences, Series Convergence and the Discrete Time Fourier Transform over Finite Fields. - R. M. Campello de Souza; M. M. Campello de Souza; Hélio Magalhães de Oliveira; M. M. Vasconcelos (CoRR, 2020)

Rounded Hartley Transform: A Quasi-involution. - Renato J. Cintra; Hélio M. de Oliveira; C. O. Cintra (CoRR, 2020)

Multi-dimensional wavelets for scalable image decomposition: Orbital wavelets. - Hélio M. de Oliveira; Victor Vermehren Valenzuela; Renato J. Cintra (Int. J. Wavelets Multiresolution Inf. Process., 2020)

Geometrical Representation for Number-theoretic Transforms. - Hélio M. de Oliveira; Renato J. Cintra (CoRR, 2021)

A New Wavelet-Based Privatization Mechanism for Probability Distributions. - Hélio M. de Oliveira; Raydonal Ospina; Víctor Leiva; Carlos Martín-Barreiro; Christophe Chesneau (Sensors, 2022)