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In this second part, the article refers to different methods -- coherent and differential detection -- used in phase estimation and reference amplitudes in the constellation of every subcarrier. In this sense, some aspects related to bidimensional channel estimator, power peak problems, amplifiers linearity and reduction as an important characteristic are described. Errors control coding, peak cancellation, pair reduction and symbol coding technique are mentioned as well. [ABSTRACT FROM AUTHOR]

In this second part, the article refers to different methods -- coherent and differential detection -- used in phase estimation and reference amplitudes in the constellation of every subcarrier. In this sense, some aspects related to bidimensional channel estimator, power peak problems, amplifiers linearity and reduction as an important characteristic are described. Errors control coding, peak cancellation, pair reduction and symbol coding technique are mentioned as well. [ABSTRACT FROM AUTHOR]

En su segunda parte, el artículo refiere los diferentes métodos--detección coherente y diferencial--empleados en la estimación de las fases y amplitudes de referencia en la constelación de cada subportadora. En ese sentido, se abordarán aspectos relacionados con el estimador de canal de dos dimensiones, el problema de los picos de potencia, la linealidad de los amplificadores, el recorte como característica importante, el control de errores mediante codificación, la cancelación de los picos, el empleo de código para reducción de par y la técnica de cifrado de símbolo. [ABSTRACT FROM AUTHOR]