K. Murakami*, M. Miyake, T. Fuji, Y. Moritani, T. Fujino, K. Ito, Fumio Takahata

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contribution


The authors recently developed two types of FEC (forward error correction) combined modems both applicable to low-data-rate and intermediate-data-rate TDMA international satellite communications. Each FEC combined modem consists of a QPSK (quadrature phase-shift keyed) modem, a convolutional encoder, and a Viterbi decoder. Both modems are designed taking into consideration the fast acquisition of the carrier and bit timing and the low cycle slipping rate in the low-carrier-to-noise-ratio environment. Attention is paid to designing the Viterbi decoder to be operated in a situation in which successive bursts may have different coding rates according to the punctured coding scheme. The overall scheme of the FEC combined modems are presented, and some of the key technologies applied in developing them are outlined. The hardware implementation and experimentation are also discussed. The measured data are compared with results of theoretical analysis, and relatively good performances are obtained.

Original languageEnglish
Title of host publicationUnknown Host Publication Title
Place of PublicationTokyo, Jpn
PublisherOhmsha Ltd
Number of pages7
ISBN (Print)4274031888
Publication statusPublished - 1987
Externally publishedYes

ASJC Scopus subject areas

  • Engineering(all)


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