Capitalizing on the tremendous performance gains of turbo codes and the turbo decoding algorithm, turbo equalization is an iterative equalization and decoding technique that can achieve equally impressive performance gains for communication systems that send digital data over channels that require equalization, i.e. those which suffer from intersymbol interference (ISI). Turbo equalizers have been shown to be successful in mitigating the effects of inter-symbol interference introduced by partial response modems and by dispersive channels for code fates of R >l/2. We analyze the performance of iterative equalization and decoding (IED) using an M-BCJR equalizer. We use bit error rate (BER), frame error rate simulations and extrinsic information transfer (EXIT) charts to study and compare the performances of M-BCJR and BCJR equalizers on precoded and non-precoded channels. We predict the BER performance of IED using the M-BCJR equalizer from EXIT charts and explain the discrepancy between the observed and predicted performances.. We show that the true LLR's can be estimated if the conditional distributions of the extrinsic outputs are known and finally we design a practical estimator for computing the true LLR's from the extrinsic outputs of the M-BCJR equalizer. © Springer-Verlag 2004.

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dc.contributor.authorKumar, P.
dc.contributor.authorBanakar, Dr.R.M.
dc.contributor.authorShankaranand, Dr.B.
dc.date.accessioned2026-02-05T11:00:20Z
dc.date.issuedM-BCJR based turbo equalizer
dc.description.abstract2004
dc.identifier.citationLecture Notes in Computer Science, 2004, 3356, , pp. 376-386
dc.identifier.issn3029743
dc.identifier.urihttps://doi.org/10.1007/978-3-540-30561-3_39
dc.identifier.urihttps://idr.nitk.ac.in/handle/123456789/27957
dc.publisherSpringer Verlag
dc.subjectBit error rate
dc.subjectIntersymbol interference
dc.subjectIterative decoding
dc.subjectLunar surface analysis
dc.subjectTurbo codes
dc.subjectConditional distribution
dc.subjectDecoding techniques
dc.subjectDispersive channels
dc.subjectExtrinsic information transfer charts
dc.subjectIterative equalization
dc.subjectPredicted performance
dc.subjectTurbo decoding algorithm
dc.subjectTurbo equalizations
dc.subjectEqualizers
dc.titleCapitalizing on the tremendous performance gains of turbo codes and the turbo decoding algorithm, turbo equalization is an iterative equalization and decoding technique that can achieve equally impressive performance gains for communication systems that send digital data over channels that require equalization, i.e. those which suffer from intersymbol interference (ISI). Turbo equalizers have been shown to be successful in mitigating the effects of inter-symbol interference introduced by partial response modems and by dispersive channels for code fates of R >l/2. We analyze the performance of iterative equalization and decoding (IED) using an M-BCJR equalizer. We use bit error rate (BER), frame error rate simulations and extrinsic information transfer (EXIT) charts to study and compare the performances of M-BCJR and BCJR equalizers on precoded and non-precoded channels. We predict the BER performance of IED using the M-BCJR equalizer from EXIT charts and explain the discrepancy between the observed and predicted performances.. We show that the true LLR's can be estimated if the conditional distributions of the extrinsic outputs are known and finally we design a practical estimator for computing the true LLR's from the extrinsic outputs of the M-BCJR equalizer. © Springer-Verlag 2004.

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