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Channel Capacity Increment Algorithm for New Generation S-DMB System using Hierarchical Modulation
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- Authors
- In Ki Lee, Dae Ig Chang
- Issue Date
- 2007-04
- Citation
- AIAA International Communications Satellite Systems Conference (ICSSC) 2007, pp.1-6
- Language
- English
- Type
- Conference Paper
- Abstract
- In this paper, we introduce Satellite Digital Multimedia Broadcasting(S-DMB) system and show the method increasing the channel capacity. To reduce the burden that has to change the existing system, the system has to be offered the Backward-compatibility. This paper show the method using hierarchical 16APSK modulation. And to obtain the reasonable BER performance between existing path(we call high priority) and additional path(we call low priority). And we introduce four kinds of simplified Soft-Decision Demapping algorithms for hierarchical 16APSK modulation. First, A Log Likelihood Ratio Method, the optimal solution but high complexity, is introduced. Second, Euclidean distance method, a little performance degradation, third, Phase sector Method, low complexity, are presented. Lastly, Sub-LLR(Max operation) algorithm is proposed, which is liitle performance degaration and has a low complexity compared to LLR method. © 2007 by the American Institute of Aeronautics and Astronautics, Inc. All rights reserved.
- KSP Keywords
- BER performance, Channel capacity, Digital multimedia broadcasting, Euclidean distance method, Hierarchical modulation, Optimal Solution, Soft-decision, likelihood ratio method, log likelihood ratio(LLR), low-complexity, performance degradation