Elechi, P., S. Kukuchuku, and J. Egwaile. “Application of QPSK-OFDM for Improved Underwater Wireless Communication System”. Journal of Telecommunication, Electronic and Computer Engineering (JTEC), vol. 11, no. 4, Dec. 2019, pp. 11-17, https://jtec.utem.edu.my/jtec/article/view/5551.