Publication: Sistemas OFDM de alta eficiencia espectral
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2012-05
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2012-07-04
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Abstract
En los últimos años, el desarrollo de los sistemas de comunicaciones ha tenido un gran auge debido a las mejoras en los sistemas de procesado digital de señales. Entre ellos, destacan los sistemas basados en las técnicas de modulación OFDM con un gran crecimiento y una expansión creciente. Las mejoras en esta técnica de transmisión de información son constantes gracias a una gran actividad investigadora. Por este motivo, surge recientemente el interés en llevar a cabo investigaciones con el objetivo de conseguir una mayor eficiencia espectral. Es cierto también, que en los últimos tiempos existe un crecimiento exponencial de la demanda de ancho de banda en cualquier tecnología. Por otro lado, la comunicación móvil se encuentra en un buen momento de crecimiento. El procesado digital de señal se ha visto en parte sobre-explotado en este punto, de forma que hay que abrirs nuevas líneas de búsqueda de otros métodos que nos lleven a conseguir esa mayor capacidad en sistemas tan relevantes como OFDM. Es esto último por lo que se presenta este trabajo, el cual se centra en la búsqueda de métodos alternativos al uso del prefijo cíclico (PC) de los sistemas OFDM, para conseguir de esta forma una mayor eficiencia espectral pero a la vez conservar la ortogonalidad de las subportadoras y de ese modo evitar la presencia de interferencias. Se han analizado diferentes alternativas propuestas en la literatura para eliminar las interferencias que provoca suprimir el prefijo cíclico, simulando las condiciones de canal, modulación y ruido consideradas por los autores. ________________________________________________________________________________________________________________________________
In recent years, development of communications systems has boomed due to improvements in systems for digital signal processing. Among them are systems based on OFDM modulation techniques with a high growth and increasing expansion. Improvements in this technique of transmission are constant through a high research activity. For this reason, recently emerged interest in conducting research in order to achieve greater spectral efficiency. It is also true that in recent times there is an exponential growth in demand for bandwidth in any technology. On the other hand, mobile communication is in a great moment of growth. The digital signal processing has been partly over-exploited at this point, so it is needed to open new lines in the search for other methods that lead us in order to achieve this increased capacity as relevant as OFDM systems. This is what it is presented in this work, which focuses on finding alternative methods to the use of cyclic prefix (PC) in OFDM systems to achieve thus increased spectral efficiency but also preserve the orthogonality of the subcarriers and thereby avoid the presence of interference. Different alternatives proposed in the literature have been analyzed in order to eliminate interference caused by removing the cyclic prefix, simulating the channel conditions, modulation and noise considered by the authors.
In recent years, development of communications systems has boomed due to improvements in systems for digital signal processing. Among them are systems based on OFDM modulation techniques with a high growth and increasing expansion. Improvements in this technique of transmission are constant through a high research activity. For this reason, recently emerged interest in conducting research in order to achieve greater spectral efficiency. It is also true that in recent times there is an exponential growth in demand for bandwidth in any technology. On the other hand, mobile communication is in a great moment of growth. The digital signal processing has been partly over-exploited at this point, so it is needed to open new lines in the search for other methods that lead us in order to achieve this increased capacity as relevant as OFDM systems. This is what it is presented in this work, which focuses on finding alternative methods to the use of cyclic prefix (PC) in OFDM systems to achieve thus increased spectral efficiency but also preserve the orthogonality of the subcarriers and thereby avoid the presence of interference. Different alternatives proposed in the literature have been analyzed in order to eliminate interference caused by removing the cyclic prefix, simulating the channel conditions, modulation and noise considered by the authors.
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Proceso de señales, Modulador OFDM, Transmisión de información, Estudio espectral