Bhat, K.P.M., Reena Nibandhe, and Kathika Roy. “Hardware Implementation of a 16-QAM Modem Using Waveform Switching Technique”. Defence Science Journal 56, no. 5 (November 1, 2006): 815-824. Accessed October 16, 2021. https://publications.drdo.gov.in/ojs/index.php/dsj/article/view/1950.