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IEICE TRANSACTIONS on Fundamentals

Coded Modulation for Satellite Broadcasting Based on Unconventional Partitionings

Motohiko ISAKA, Robert H. MORELOS-ZARAGOZA, Marc P. C. FOSSORIER, Shu LIN, Hideki IMAI

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Summary :

Unequal error protection (UEP) is a very promising coding technique for satellite broadcasting, as it gradually reduces the transmission rate. From the viewpoint of bandwidth efficiency, UEP should be achieved in the context of multilevel coded modulation. However, the conventional mapping between encoded bits and modulation signals, usually realized for multilevel block modulation codes and multistage decoding, is not very compatible with UEP coding because of the large number of resulting nearest neighbor codewords. In this paper, new coded modulation schemes for UEP based on unconventional partitioning are proposed. A linear operation referred to as interlevel combination is introduced. This operation generalizes previous partitioning proposed for UEP applications and provides additional flexibility with respect to UEP capabilities. The error performance of the proposed codes are evaluated both by computer simulations and a theoretical analysis. The obtained results show that the proposed codes achieve good tradeoff between the proportion and the error performance of each error protection level.

Publication
IEICE TRANSACTIONS on Fundamentals Vol.E81-A No.10 pp.2055-2063
Publication Date
1998/10/25
Publicized
Online ISSN
DOI
Type of Manuscript
Special Section PAPER (Special Section on Information Theory and Its Applications)
Category
Coded Modulation

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