Resumo

GOMEZ GOMEZ, Wagner; HERRERA FONSECA, Yosbel J.; LAVANDERA RODRIGUEZ, Ismael  e  VALDES ZALDIVAR, EnriqueErnesto. Design of a voice communication system using DC-PLC based on BFSK modulation. EAC [online]. 2023, vol.44, n.1, pp. 1-16.  Epub 06-Dez-2023. ISSN 1815-5928.

This work addresses the fundamental concepts in the design of a voice communications system that uses the operating principles of direct current power line communications (DC-PLC: Direct Current - Power Line Communications) based on BFSK modulation. The system is composed of a transmission subsystem and a voice signal reception subsystem, these elements are interconnected through a DC-PLC channel referenced to a twisted copper pair. The transmission subsystem performs the functions associated with the conditioning, digitization and processing of the signal for its digital transfer with a BFSK modulation in the communication channel. The receiving subsystem performs the BFSK demodulation, processing and recovery of the voice signal for monitoring. For both subsystems a design based on the use of Silicon Laboratories 8051 core microcontrollers is proposed. The UART peripheral available in the 8051 microcontrollers is used for digital data transfer and is applicable as a transmission method in the DC-PLC channel type. In addition, the design criteria of the internal circuits are presented and exposed through their electrical schematics.

Palavras-chave : Voice; DC-PLC; BFSK modulation; 8051’s microcontroller.