DESIGN AND IMPLEMENTATION OF SOFTWARE-DEFINED PI/4-DQPSK MODEM WITH RECEIVE ANTENNA DIVERSITY. ENVIRONMENT. TECHNOLOGY. RESOURCES. Proceedings of the International Scientific and Practical Conference, [S. l.], v. 3, p. 101–104, 2024. DOI: 10.17770/etr2024vol3.8108. Disponível em: https://archive-journals.rtu.lv/etr/article/view/5038.. Acesso em: 11 mar. 2026.