Wulandari, S. A., T. B. Santoso, and I. G. P. Astawa. “Adaptive Code With Non-Uniform Modulation on OFDM Subcarriers Modeling for Underwater Acoustic Environment”. Journal of Telecommunication, Electronic and Computer Engineering (JTEC), vol. 11, no. 3, Sept. 2019, pp. 1-5, https://jtec.utem.edu.my/jtec/article/view/4945.