Evaluation of Telemedicine systems for ECG analysis: Advances in the design of RF schemes

Manuel de Jesús  García-Ortega; José Ricardo  Cárdenas-Valdez; Ángel Humberto Corral-Domínguez; Fortunato  Ramírez-Arzate; Andrés  Calvillo-Téllez

doi:10.29057/icbi.v11iEspecial2.10779

Manuel de Jesús García-Ortega Instituto Tecnológica de Tijuana https://orcid.org/0000-0001-8159-3351
José Ricardo Cárdenas-Valdez Instituto Tecnológico de Tijuana https://orcid.org/0000-0002-5437-8215
Ángel Humberto Corral-Domínguez Instituto Tecnológica de Tijuana https://orcid.org/0000-0003-2009-6161
Fortunato Ramírez-Arzate Instituto Tecnológica de Tijuana https://orcid.org/0009-0009-6107-1826
Andrés Calvillo-Téllez Instituto Tecnológica de Tijuana https://orcid.org/0000-0003-3721-5630

DOI: https://doi.org/10.29057/icbi.v11iEspecial2.10779

Keywords: n-QAM, Post-pandemic, P1dB, RF, Transceiver

Abstract

The monitoring and transmission of biomedical signals, particularly ECG is essential in the post-pandemic era. In this research, an RF transmission with a carrier frequency of 2.45 GHz for ECG is used. A testbed for variable n-QAM schemes is developed with a low noise amplifier characterized in its linear region based on its P1dB, to guarantee a low level of induced non-linearities. The system includes an acquisition stage using the Olimex module and electrodes with an Ag/AgCl type sensor, and an algorithm is developed for detecting peaks in heart signals, heart rate and calculation of sample-based heart rate. The transceiver has total control of the transmitted tones, and a signal demodulation process is carried out in the receiver, one of the main challenges in Telemedicine is to ensure the fidelity of a signal, an EVM_RMS of 8.36 is obtained for fifteen OFDM symbol frames. The developed system as a Telemedicine proposal provides versatility for signal acquisition, digitalization, data storage and a multivariable n-QAM scheme, which makes it viable for Telemedicine and classification processes.

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