Experimental Study of DQPSK Modulation on SDR Platform

Eko Marpanaji (Departement of Electronics Engineering, Yogyakarta State University Karangmalang, Yogyakarta 55281, Telp. [phone], Indonesia School of Electrical Engineering and Informatics, Institut Teknologi Bandung Jl. Ganesa 10 Bandung 40132, Telp. +62-22)
Bamba Riyanto Trilaksono (School of Electrical Engineering and Informatics, Institut Teknologi Bandung Jl. Ganesa 10 Bandung 40132, Telp. [phone], Fax. [phone], Indonesia)
Armein Z. R. Langi (School of Electrical Engineering and Informatics, Institut Teknologi Bandung Jl. Ganesa 10 Bandung 40132, Telp. [phone], Fax. [phone], Indonesia)
Adit Kurniawan (School of Electrical Engineering and Informatics, Institut Teknologi Bandung Jl. Ganesa 10 Bandung 40132, Telp. [phone], Fax. [phone], Indonesia)
Andri Mahendra (School of Electrical Engineering and Informatics, Institut Teknologi Bandung Jl. Ganesa 10 Bandung 40132, Telp. [phone], Fax. [phone], Indonesia)
Thay Liung (School of Electrical Engineering and Informatics, Institut Teknologi Bandung Jl. Ganesa 10 Bandung 40132, Telp. [phone], Fax. [phone], Indonesia)

Journal of ICT Research and Applications
Vol. 1 No. 2 (2007)

This Paper addresses Differential Quadriphase Shift Keying (DQPSK) modulation implemented on SDR platform for the development of digital data  communications based on Software-Defined Radio (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 payload size from delivered data. Based on these results, the smallest PER could be obtained by setting Eb/No value 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.