A Burst Modulation/Demodulation Method for Narrowband Ubiquitous Communication Systems

Takafumi FUJITA  Daisei UCHIDA  Yosuke FUJINO  Osamu KAGAMI  Kazuji WATANABE  

IEICE TRANSACTIONS on Communications   Vol.E91-B   No.11   pp.3416-3425
Publication Date: 2008/11/01
Online ISSN: 1745-1345
DOI: 10.1093/ietcom/e91-b.11.3416
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Section on Emerging Technologies for Practical Ubiquitous and Sensor Networks)
burst modem,  ubiquitous,  transmission efficiency,  burst synchronization,  testbed study,  

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This paper presents a wireless burst modulation/ demodulation method for narrowband ubiquitous communication systems. This method especially suits those systems, whose traffic is especially dominated by short frame bursts. The proposed modulation method provides a preamble-less frame structure with training symbols, which improves both transmission efficiency and burst synchronization performance. Moreover, the proposed demodulation method achieves superior burst synchronization performance in low carrier-to-noise power ratio (CNR) environments by applying a synchronization method that includes symbol timing recovery, slot synchronization, carrier frequency correction and channel tracking. In addition, this paper presents the result of experiments on hardware prototypes of the proposed modulator and demodulator. The basic operation and practical performance of the proposed method is confirmed through testbed studies.