In light of the recently proposed generalized correlation function named correntropy, which explo... more In light of the recently proposed generalized correlation function named correntropy, which exploits higher-order statistics and the time structure of signals, we have, in this work, two main objectives: 1) to give a new interpretation – founded on the relationships between the constant modulus (CM) and Shalvi-Weinstein criteria and between the latter and methods for ICA based on nongaussianity –
2014 International Telecommunications Symposium (ITS), 2014
ABSTRACT In this work, an extended polynomial formulation of the constant modulus (CM) criterion ... more ABSTRACT In this work, an extended polynomial formulation of the constant modulus (CM) criterion under quadratic constraints is presented. Based on the method of Lagrange Multipliers, this `Volterra-CM formulation' brings very relevant information about the structure of the null-gradient CM solutions in the equalizer parameter space, including a conjecture regarding the relationship between the smallest multiplier and the optimal CM receiver. In the case of a two-tap filter, the proposed formulation allows that the solutions be obtained in terms of a single parameter, the corresponding Lagrange multiplier. For filters with more than two taps, the problem requires that a nonlinear system be solved, which is done with the aid of an iterative algorithm. The obtained global convergence rates show that the formulation is an effective tool to describe the structure of the optimal CM solution.
Sumário: Neste artigo apresentamos uma implementação em um processador DSP de um equalizador de m... more Sumário: Neste artigo apresentamos uma implementação em um processador DSP de um equalizador de máxima verossimilhança que opera nas condições do sistema D-AMPS TDMA de telefonia celular digital. Resultados em tempo real obtidos com o DSP são comparados com a simulação via Matlab. O sistema permite também observar o desempenho do equalizador através da transmissão e conseqüente escuta de sinais de voz. O equalizador é controlado por uma interface gráfica amigável que roda em um PC ...
In light of the recently proposed generalized correlation function named correntropy, which explo... more In light of the recently proposed generalized correlation function named correntropy, which exploits higher-order statistics and the time structure of signals, we have, in this work, two main objectives: 1) to give a new interpretation – founded on the relationships between the constant modulus (CM) and Shalvi-Weinstein criteria and between the latter and methods for ICA based on nongaussianity –
2014 International Telecommunications Symposium (ITS), 2014
ABSTRACT In this work, an extended polynomial formulation of the constant modulus (CM) criterion ... more ABSTRACT In this work, an extended polynomial formulation of the constant modulus (CM) criterion under quadratic constraints is presented. Based on the method of Lagrange Multipliers, this `Volterra-CM formulation' brings very relevant information about the structure of the null-gradient CM solutions in the equalizer parameter space, including a conjecture regarding the relationship between the smallest multiplier and the optimal CM receiver. In the case of a two-tap filter, the proposed formulation allows that the solutions be obtained in terms of a single parameter, the corresponding Lagrange multiplier. For filters with more than two taps, the problem requires that a nonlinear system be solved, which is done with the aid of an iterative algorithm. The obtained global convergence rates show that the formulation is an effective tool to describe the structure of the optimal CM solution.
Sumário: Neste artigo apresentamos uma implementação em um processador DSP de um equalizador de m... more Sumário: Neste artigo apresentamos uma implementação em um processador DSP de um equalizador de máxima verossimilhança que opera nas condições do sistema D-AMPS TDMA de telefonia celular digital. Resultados em tempo real obtidos com o DSP são comparados com a simulação via Matlab. O sistema permite também observar o desempenho do equalizador através da transmissão e conseqüente escuta de sinais de voz. O equalizador é controlado por uma interface gráfica amigável que roda em um PC ...
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