Sadinov, S., et al. “Simulation Evaluation of BER Characteristics for M-PSK and M-QAM Modulations Used in the Reverse Channel of Cable TV Nets”. Elektronika Ir Elektrotechnika, vol. 95, no. 7, Aug. 2009, pp. 71-76, https://doi.org/10.5755/j02.eie.10049.