EXIT-Optimized Index Assignments for Turbo Decoders with Unreliable LLR Transfer
This letter considers a Turbo decoder for which the log likelihood ratios (LLRs) exchanged between constituent decoders are subject to independent bit errors. The resilience of the decoder against these errors can be improved - without increasing decoding complexity - by optimizing the index assignm...
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| Vydáno v: | IEEE communications letters Ročník 17; číslo 5; s. 992 - 995 |
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| Hlavní autoři: | , |
| Médium: | Journal Article |
| Jazyk: | angličtina |
| Vydáno: |
New York, NY
IEEE
01.05.2013
Institute of Electrical and Electronics Engineers The Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Témata: | |
| ISSN: | 1089-7798, 1558-2558 |
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| Abstract | This letter considers a Turbo decoder for which the log likelihood ratios (LLRs) exchanged between constituent decoders are subject to independent bit errors. The resilience of the decoder against these errors can be improved - without increasing decoding complexity - by optimizing the index assignment (IA) of the LLRs with respect to the extrinsic information transfer (EXIT) characteristic of the decoder. To enable an effective optimization of the IA we propose an approximation of the mutual information of the extrinsic decoder output that can be computed efficiently without histogram measurements. Numerical results in terms of bit error rates are reported for different scenarios to validate the proposed approach. |
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| AbstractList | This letter considers a Turbo decoder for which the log likelihood ratios (LLRs) exchanged between constituent decoders are subject to independent bit errors. The resilience of the decoder against these errors can be improved - without increasing decoding complexity - by optimizing the index assignment (IA) of the LLRs with respect to the extrinsic information transfer (EXIT) characteristic of the decoder. To enable an effective optimization of the IA we propose an approximation of the mutual information of the extrinsic decoder output that can be computed efficiently without histogram measurements. Numerical results in terms of bit error rates are reported for different scenarios to validate the proposed approach. |
| Author | Geldmacher, J. Gotze, J. |
| Author_xml | – sequence: 1 givenname: J. surname: Geldmacher fullname: Geldmacher, J. email: jan.geldmacher@tu-dortmund.de organization: Inf. Process. Lab., Tech. Univ. Dortmund, Dortmund, Germany – sequence: 2 givenname: J. surname: Gotze fullname: Gotze, J. email: juergen.goetze@tu-dortmund.de organization: Inf. Process. Lab., Tech. Univ. Dortmund, Dortmund, Germany |
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| Cites_doi | 10.1145/1403375.1403484 10.1109/JPROC.2010.2057230 10.1109/TIT.1969.1054275 10.1109/ISQED.2007.53 10.1109/Allerton.2012.6483283 10.1109/ISTC.2012.6325236 10.1109/26.957394 10.1109/ACSSC.2010.5757543 10.1109/ACSSC.2010.5757661 10.1109/GLOCOM.2010.5683123 10.1109/18.53739 10.1109/92.974895 10.1109/VETECF.2011.6092880 10.1007/978-3-642-28293-5_2 10.1109/26.64657 10.1109/GLOCOM.2011.6134075 10.1002/0471200611 |
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| Copyright | 2014 INIST-CNRS Copyright The Institute of Electrical and Electronics Engineers, Inc. (IEEE) May 2013 |
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| Keywords | Histogram Bit error rate EXIT chart Optimization Fault tolerance Algorithm complexity fault tolerant decoder Turbo codes soft errors Fault tolerant system unreliable LLRs Logarithmic function Transfer characteristic Likelihood ratio Turbo code Decoding index assignment Information transmission Resilience Error detection Numerical simulation error resilience Error correction Reliability Mutual information |
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| Snippet | This letter considers a Turbo decoder for which the log likelihood ratios (LLRs) exchanged between constituent decoders are subject to independent bit errors.... |
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| SubjectTerms | Applied sciences Approximation Approximation methods Bit error rate Coding, codes Decoders Decoding error resilience Errors Exact sciences and technology Exchanging EXIT chart fault tolerant decoder index assignment Indexes Information, signal and communications theory Iterative decoding Likelihood ratio Mathematical analysis Optimization Resilience Signal and communications theory soft errors Systems, networks and services of telecommunications Telecommunications Telecommunications and information theory Transmission and modulation (techniques and equipments) Turbo codes unreliable LLRs |
| Title | EXIT-Optimized Index Assignments for Turbo Decoders with Unreliable LLR Transfer |
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