A Prototype Modem with the Capability of Unequal Error Protection Developed for ETS-VIII Experiments

Huan-Bang LI
Mitsugu OHKAWA
Noriyuki KARIYA

IEICE TRANSACTIONS on Communications   Vol.E87-B    No.8    pp.2090-2098
Publication Date: 2004/08/01
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Section on Recent Fundamental Technologies for Broadband Satellite Communications)
unequal error protection,  multiple block coded modulation,  carrier recovery,  frame format,  link budget,  

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A prototype modem with unequal error protection (UEP) capability was developed using multiple block coded modulation (MBCM). Benefited from its unique structure, MBCM can be used to provide UEP straightforward. We propose a new method to increase the robustness of the carrier recovery process by taking advantage of the MBCM code structure. We also use a frame format to facilitate the synchronization operation. This modem was developed in preparation for the mobile satellite communication experiments using the Engineering Test Satellite of VIII-type (ETS-VIII). In addition of MBCM, some other types of modulation schemes have been implemented in the same modem to enable a range of communication experiments to be performed. The modem can operate at variable data rates. The results of laboratory measurements agreed well with computer simulation results. Typical link budgets based on the parameters of ETS-VIII are also presented.