Sadinov, S., K. Koichev, P. Penchev, and K. Angelov. “Simulation Evaluation of BER Characteristics for M-PSK and M-QAM Modulations Used in the Reverse Channel of Cable TV Nets”. Elektronika ir Elektrotechnika 95, no. 7 (August 20, 2009): 71-76. Accessed December 1, 2020. https://eejournal.ktu.lt/index.php/elt/article/view/10049.