Development of an Adaptive Acquisition and Transmission System for Digital Processing of ECG Signals under Variable n-QAM Schemes

José Ricardo Cárdenas-Valdez; Fortunato Ramírez-Arzate; Ángel Humberto Corral-Domínguez; Carlos Hurtado-Sánchez; Andrés Calvillo-Téllez; Enrique Efrén García-Guerrero

doi:10.17488/RMIB.44.4.8

Autores/as

José Ricardo Cárdenas-Valdez Tecnológico Nacional de México/Instituto Tecnológico de Tijuana, México https://orcid.org/0000-0002-5437-8215
Fortunato Ramírez-Arzate Tecnológico Nacional de México/Instituto Tecnológico de Tijuana, México https://orcid.org/0009-0009-6107-1826
Ángel Humberto Corral-Domínguez Tecnológico Nacional de México/Instituto Tecnológico de Tijuana, México https://orcid.org/0000-0003-2009-6161
Carlos Hurtado-Sánchez Tecnológico Nacional de México/Instituto Tecnológico de Tijuana, México https://orcid.org/0000-0002-9913-592X
Andrés Calvillo-Téllez CITEDI-Instituto Politécnico Nacional, México https://orcid.org/0000-0003-3721-5630
Enrique Efrén García-Guerrero Universidad Autónoma de Baja California, México https://orcid.org/0000-0001-5052-6850

DOI:

https://doi.org/10.17488/RMIB.44.4.8

Palabras clave:

ECG, n-QAM, RF, telemedicina, transceptor

Resumen

El monitoreo y transmisión de señales biomédicas, particularmente ECG, es fundamental en la era pospandemia, este trabajo de investigación se centra en el desarrollo de una plataforma para la adquisición, adaptación y transmisión de señales bajo diversos esquemas de modulación n-QAM. El sistema incluye una etapa de adquisición mediante el módulo Olimex y electrodos con un sensor tipo Ag/AgCl. Se desarrolló un algoritmo adaptativo a los diversos esquemas de modulación n-QAM para la gestión de anchos de banda apropiados durante una implementación en la banda de 2,5 GHz, al amplificador de potencia se operó en la región lineal para mejorar el factor de cresta y obtener un ACPR cercano a 30 dBc, se realizó una demodulación adecuada de la señal ECG y es posible migrar a esquemas de modulación superiores a 64-QAM si se requiere detectar altas frecuencias y un posterior análisis de Fourier. El sistema desarrollado como propuesta de Telemedicina brinda versatilidad para la adquisición de señales, digitalización, almacenamiento de datos y un esquema multivariable n-QAM, la implementación en hardware proporcionó una adecuada adaptabilidad para esquemas n-QAM. El sistema se implementó sobre un transceptor AD9361 que elimina el tradicional generador vectorial de señal y permite un control óptimo de los tonos a enviar, para aporte en el área de Telemedicina a través de transmisión RF.

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