Palinggi, S. 2026. Performance Evaluation of Modulation Schemes on HAPS 28 GHz Backhaul Link: Reliability Analysis and Spectral Efficiency Trade-off . Protek : Jurnal Ilmiah Teknik Elektro. 13, 3 (Sep. 2026). DOI:https://doi.org/10.33387/protk.v13i3.12651.