Acheampong, Abednego, Nathaniel Martey, and Daniel Appiah Kumah. 2019. “A Comprehensive Study of Optimal Linear Pre-Coding Schemes for a Massive Mu-MIMO Downlink System; A Survey”. International Journal of Computer (IJC) 32 (1):21-33. https://ijcjournal.org/index.php/InternationalJournalOfComputer/article/view/1359.