163 citations · 1.5k across the 72 of their papers we have counts for
5 papers · 1 filter
Geometrical Representation for Number-theoretic Transforms
H. M. de Oliveira, R. J. Cintra
This short note introduces a geometric representation for binary (or ternary) sequences. The proposed representation is linked to multivariate data plotting according to the radar…
Multiuser Communication Based on the DFT Eigenstructure
R. M. Campello de Souza, H. M. de Oliveira, R. J. Cintra
The eigenstructure of the discrete Fourier transform (DFT) is examined and new systematic procedures to generate eigenvectors of the unitary DFT are proposed. DFT eigenvectors are…
An Orthogonal 16-point Approximate DCT for Image and Video Compression
T. L. T. da Silveira, F. M. Bayer, R. J. Cintra +3
A low-complexity orthogonal multiplierless approximation for the 16-point discrete cosine transform (DCT) was introduced. The proposed method was designed to possess a very low com…
A Generalized Prefix Construction for OFDM Systems Over Quasi-Static Channels
T. Cooklev, H. Dogan, R. J. Cintra +1
All practical OFDM systems require a prefix to eliminate inter-symbol interference at the receiver. Cyclic prefix (CP) and zero-padding are well-known prefix construction methods,…
Multi-beam 4 GHz Microwave Apertures Using Current-Mode DFT Approximation on 65 nm CMOS
V. Ariyarathna, S. Kulasekera, A. Madanayake +4
A current-mode CMOS design is proposed for realizing receive mode multi-beams in the analog domain using a novel DFT approximation. High-bandwidth CMOS RF transistors are employed…