A Fading Reduction Technique Using Interleave-Aided Open Loop Space Diversity for Digital Maritime-Satellite Communications

Hisato IWAI  Masayuki YASUNAGA  Yoshio KARASAWA  

IEICE TRANSACTIONS on Communications   Vol.E74-B   No.10   pp.3286-3294
Publication Date: 1991/10/25
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on Mobile Communication Antennas)

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In maritime satellite communications particularly for low G/T earth stations, multipath fading becomes a serious problem, especially at low elevation angles. In this paper, we show a new fading reduction scheme for sea surface reflection applicable to INMARSAT-C system. This method using open-loop-controlled diversity combined with an FEC and a interleaver overcomes the disadvantages generally associated with a conventional diversity system. This method has a respectable fading reduction effect, moreover, it can shorten the interleave length. We evaluate these effects of the system by a computer simulation and discuss its performance. The applicability of this fading reduction technique is not only to the INMARSAT-C but also to any kind of digital communication systems where interleave, FEC, and diversity can be used.