Abstract
In this paper, we present adaptive quantization schemes in the normalized min-sum decoding algorithm considering scaling effects to improve the performance of irregular low-density parity-check (LDPC) decoder for WirelessMAN (IEEE 802.16e) applications. We discuss the finite precision effects on the performance of irregular LDPC codes and develop optimal finite word lengths of variables over an SNR. For floating point simulation, it is known that in the normalized min-sum or offset min-sum algorithms the performance of a min-sum based decoder is not sensitive to scaling in the log-likelihood ratio (LLR) values. However, when considering the finite precision for hardware implementation, the scaling affects the dynamic range of the LLR values. The proposed adaptive quantization approach provides the optimal performance in selecting suitable input LLR values to the decoder as far as the tradeoffs between error performance and hardware complexity are concerned.
| Original language | English (US) |
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| Title of host publication | 2008 IEEE International Symposium on Circuits and Systems, ISCAS 2008 |
| Pages | 536-539 |
| Number of pages | 4 |
| DOIs | |
| State | Published - 2008 |
| Event | 2008 IEEE International Symposium on Circuits and Systems, ISCAS 2008 - Seattle, WA, United States Duration: May 18 2008 → May 21 2008 |
Publication series
| Name | Proceedings - IEEE International Symposium on Circuits and Systems |
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| ISSN (Print) | 0271-4310 |
Other
| Other | 2008 IEEE International Symposium on Circuits and Systems, ISCAS 2008 |
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| Country/Territory | United States |
| City | Seattle, WA |
| Period | 5/18/08 → 5/21/08 |
Bibliographical note
Funding Information:The authors acknowledge support from the Spanish Ministerio de Economa y Competitividad (MINECO) (Grant No. MAT2013-46593-C6-2-P), the Basque Departamento de Educaci?n and the UPV/EHU (Grant No. IT-756-13), and the Deutsche Forschungsgemeinschaft through the Sonderforschungsbereich 1083. AXBR acknowledges support from the Basque Departamento de Educaci?n and the UPV/EHU through a Zabalduz grant.