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http://dx.doi.org/10.12673/jkoni.2013.17.6.693

Simulation Study of VHF band π/4-DQPSK Maritime Digital Communication Modem According to ITU-R M.1842-1 Annex1  

Kwak, Jae-Min (Department of Information and Communication Eng., Mokpo National Maritime University)
Publication Information
Journal of Advanced Navigation Technology / v.17, no.6, 2013 , pp. 693-699 More about this Journal
Abstract
In this paper, ${\pi}/4$-DQPSK modem according to ITU-R M.1842-1 recommendation Annex1 is investigated and simulated. At first, standardization and technical trend of VHF maritime mobile communication are introduced. The ${\pi}/4$-DQPSK modem defined in the Annex1 should support 28.8Kbps bit transmission rate within 25KHz frequency bandwidth. We describe the system model and simulation process of ${\pi}/4$-DQPSK modem transmitter and receiver design with RRC(Root Raised Cosine) transmitter and receiver filter. Then we suggest various graphical simulation results(time domain signals, constellation, power spectral density according to roll-off factor, eye diagram), and show simulated BER performance of the modem. From the simulation results, it is shown that roll-off factor of RRC filter affects to BER performance according to SNR and the designed simulation model meets the spectrum mask requirement suggested in ITU-R M.1842-1 recommendation.
Keywords
${\pi}/4$-DQPSK; RRC filter; BER; ITU-R M.1842-1;
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