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

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 EVMRMS 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.