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A Soft Demapping Method for 64-APSK in the DVB-S3 System  

Li, Guowen (전북대학교 전자공학부 IT융합연구센터)
Zhang, Meixiang (전북대학교 전자공학부 IT융합연구센터)
Kim, Sooyoung (전북대학교 전자공학부 IT융합연구센터)
Publication Information
Journal of Satellite, Information and Communications / v.9, no.2, 2014 , pp. 23-27 More about this Journal
Abstract
In this paper, we propose a soft demapping method for 64-ary APSK in the DVB-S3 system. The proposed method in this paper uses the hard decision threshold (HDT) line for each constituent bit in a symbol, and calculates the soft bit information with the distance between the HDT line and the detected symbol. If the HDT lines are defined in a simple manner, the complexity to estimate soft information can be largely reduced compared with the maximum likelihood detection (MLD) which has an exponential complexity. By considering this, we first derive HDT lines for each constituent bit for a 64-APSK symbol, and propose a method to calculate soft bit information. We simulate the BER performance of the proposed scheme by using a turbo codes which requires soft-input-soft-output information, and compare it that of the MLD. The result show that the proposed scheme produces approximating performance to MLD with largely reduced complexity.
Keywords
satellite communication; soft demapping; 64-APSK; DVB-S3; satellite broadcasting;
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  • Reference
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