A Unit Quaternion-based Spherical Trigonometry and a New Two-carrier Phase-quadrature Quaternion Modulation System
A new Hyperspherical trigonometry based on Quaternion ́s Algebra is introduced. Spatial curves on the surface of the unit-quaternion hypersphere are describe...
- H.M. de Oliveira
- D.R. de Oliveira
- R.M. Campello de Souza
SBrT 2011
Modulação para rádio digital utilizando a amplitude de autocorrelação de códigos PN para transporte da informação.
The frequency bands used in mobile communications are allocated according to the type of application. With the need for more channels, the frequency spect...
- Fabrício de Araújo Carvalho
- Fernando Walter
- Digital Radio Broadcasting
- Spectral Efficiency
- Pseudo-random codes
- CDMA
- PWM.
SBrT 2012
Video Quality Assessment Based on the Effect of the Estimation of the Spatial Perceptual Information
The objective video quality assessment is a quick and low cost alternative compared with the subjective evaluation. However, the objective evaluation is no...
- Carlos D. M. Regis
- José V. de M. Cardoso
- Marcelo S. Alencar
- Video Quality Assessment
- Structural Similarity
- Visual Attention
- Spatial Perceptual Information
- Human Visual System.
SBrT 2012
Economic Modeling of Radio Resource Management: A Novel Metaheuristic Approach
In this paper we introduce a constrained hybridPSO algorithm, called Improved Hybrid Particles Swarm Optimi-zation (I-HPSO), in order to find feasible soluti...
- César L. C. Mattos
- Guilherme A. Barreto
- Francisco R. P. Cavalcanti
SBrT 2011
The Hamming and Golay Number-Theoretic Transforms
New number-theoretic transforms are derived from known linear block codes over finite fields. In particular, two new such transforms are built from perfect c...
- A. J. A. Paschoal
- R. M. Campello de Souza
- H. M. de Oliveira
SBrT 2018