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Experimental Study of DQPSK Modulation on SDR Platform
1,2Eko Marpanaji, 2Bambang Riyanto T., 2Armein Z.R. Langi, 2Adit Kurniawan, 2Andri Mahendra & 2Thay Liung
1Departement of Electronics Engineering, Yogyakarta State University
Karangmalang, Yogyakarta 55281, Telp. +62-274-586168, Indonesia
2School of Electrical Engineering and Informatics, Institut Teknologi Bandung
Jl. Ganesa 10 Bandung 40132, Telp. +62-22-2501661, Fax. +62-22-2534133, Indonesia
Email : ekoaji332@students.itb.ac.id
Abstract. This Paper addresses Differential Quadriphase Shift Keying (DQPSK) modulation implemented on SDR platform for the development of digital data communications based on SDR. DQPSK modulation performance perceived at Packet Error Rate (PER) is evaluated in terms of Eb/No or S/N ratio, carrier frequency, bit rate, gain, roll-off factor of root Nyquist filter or root raised cosine filter, and of size of payload from delivered data. Based on this results, the smallest PER could be obtained by setting Eb/No value which is greater than 20 dB, carrier frequency of at least 0,3 MHz, optimum bit rate of 200 kbps, optimum range payload size of 2000 up to 4000 bytes, and roll-off factor of Nyquist or root-raised cosine filter of 0.4.
Keywords: Differential quadriphase shift keying, packet error rate, root raised cosine, software-defined radio, usrp
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