Marpanaji, E., B. R. Trilaksono, A. Z. R. Langi, A. Kurniawan, A. Mahendra, and T. Liung. “Experimental Study of DQPSK Modulation on SDR Platform”. Journal of ICT Research and Applications, vol. 1, no. 2, Sept. 2013, pp. 84-98, doi:10.5614/itbj.ict.2007.1.2.2.