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New M-ary Differential-Frequency Shift Keying Modulation Enhancing Acoustic Modem's Synchronization For Ubiquitous Communication  

Kim, En-Ki (School of Electronicl and Computer Engineering Chungbuk National University)
Kim, Young-Ju (School of Electronicl and Computer Engineering Chungbuk National University)
Lee, In-Sung (School of Electronicl and Computer Engineering Chungbuk National University)
Publication Information
Journal of the Institute of Electronics Engineers of Korea TC / v.43, no.1, 2006 , pp. 25-32 More about this Journal
Abstract
We propose a new M-ary state-transition FSK modulator technique for enhancing demodulator's symbol timing recovery which can be applied to acoustic MODEM. In the previous technique, the demodulator's symbol timing performance can degrade when the sequences of same symbols are transmitted. This proposed method, because the transmission symbol changes in every single symbol period, increases the synchronization performance dramatically and has a simple MODEM and frame structure. On the one hand, we improve modulation-derived synchronization(MDS) which is M-ary FSK's symbol timing recovery scheme, then analyze it. Finally the proposed method is analyzed from the viewpoint of frequency efficiency, which proves this method is appropriate for acoustic MODEM.
Keywords
digital MODEM; differential detection; FSK; synchronization; USN;
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