NDLI: Design and implementation of a π/4-DQPSK transmitter for maritime VHF digital communications

Content Provider	IEEE Xplore Digital Library
Author	Seung-Geun Kim Soyoung Sung Chanho Yun Young-Kon Lim
Copyright Year	2011
Description	Author affiliation: Ocean System Engineering Research Department, MOERI, KORDI, 104 Sinseong-Ro, Yuseong-gu, Daejeon, 305-343, Republic of Korea (Seung-Geun Kim; Soyoung Sung; Chanho Yun; Young-Kon Lim)
Abstract	In this paper, a design and implementation of π/4-DQPSK transmitter for the exchange of digital data and e-mail between shore and ship stations and/or between ship stations on the one of the maritime mobile service VHF channels are described. The designed transmitter is composed of a baseband modulator, a baseband-to-RF band up-converter with Cartesian feedback, a power amplifier, and a coupler. Base on the design, the π/4-DQPSK transmitter is implemented. The implemented transmitter is composed two boards. One is implemented for system control, external interface, baseband modulation and mixing with Cartesian feedback. The other is implemented for power amplifier, coupler, and generation of required DC voltages. The emitted power spectrum of implemented transmitter is measured using spectrum analyzer through 30 dB attenuator. The measured results show that the in-band signal power is slightly reduced and the out-of-band signal power is additionally reduced more than 30 dB when the Cartesian feedback loop is used.
Starting Page	1
Ending Page	5
File Size	1085412
Page Count	5
File Format	PDF
ISBN	9781457700866
e-ISBN	9781457700880
DOI	10.1109/Oceans-Spain.2011.6003639
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2011-06-06
Publisher Place	Spain
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Radio transmitters Modulation Power amplifiers Baseband Couplers Marine vehicles
Content Type	Text
Resource Type	Article

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