| Autor: |
Yue Heng Li, Mei Yan Ju, Huang Ping |
| Rok vydání: |
2014 |
| Předmět: |
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| Zdroj: |
Applied Mechanics and Materials. :1016-1020 |
| ISSN: |
1662-7482 |
| DOI: |
10.4028/www.scientific.net/amm.519-520.1016 |
| Popis: |
In this paper, A new on-line LLR optimization method based on the generalized mutual information (GMI) maximization is proposed for LDPC coded BICM systems. As the BP decoder is sensitive to imperfect soft demodulator output information, it is necessary to correct the LLRs to provide the reliable information for BP decoder. The proposed method searched the scalar factors to maximize the GMI for each bit channel, and applied them to the demodulator output LLRs. Different from the previous reference, the proposed found the factors by on-line computation with minor complexity. This characteristic makes it is more effective in the real systems where the channel changes rapidly. Numerical and simulation results verify that the proposed method achieves noticeable performance improvement for MIMO-BICM systems with LDPC codes. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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