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The soft-feedback equalizer for turbo equalization of highly dispersive channels

R.R. Lopes, J.R. Barry
2006 IEEE Transactions on Communications  
To enable turbo equalization of highly dispersive channels, we propose the soft-feedback equalizer (SFE). The SFE combines linear equalization and soft intersymbol-interference cancellation.  ...  The complexity of a turbo equalizer based on the Bahl-Cocke-Jelinek-Raviv (BCJR) algorithm is manageable only for mildly dispersive channels having a small amount of memory.  ...  In this letter, we propose the soft-feedback equalizer (SFE), a low-complexity structure that enables turbo equalization for highly dispersive channels.  ... 
doi:10.1109/tcomm.2006.874009 fatcat:fjl7k77rivczto7qb4mutpg6uu

Turbo-Fuzzy Equalization for Single-Carrier Power Line Channels

Moises V. Ribeiro, Murilo B. Loiola, Renato R. Lopes
2007 2007 IEEE International Symposium on Power Line Communications and Its Applications  
Generally speaking, the TFEQ is obtained by introducing an adaptive decision feedback nonsingleton fuzzy equalizer into the turbo equalization structure.  ...  Simulation results reveal the applicability of this approach to overcome the noise impairments in the power line frequency range for broadband applications.  ...  , dispersive, and linear finite impulse response (FIR) of the PL channel, and the sequence {x(n)} consists of transmitted symbols.  ... 
doi:10.1109/isplc.2007.371117 fatcat:mex3xfh4knh2bmodkfplssor4m

Adaptive turbo reduced-rank equalization for MIMO channels

Yakun Sun, V. Tripathi, M.L. Honig
2005 IEEE Transactions on Wireless Communications  
An adaptive iterative (turbo) decision-feedback equalizer (DFE) for channels with intersymbol interference (ISI) is presented.  ...  Numerical results show that for MIMO channels with limited training, the reduced-rank turbo DFE can perform significantly better than the full-rank turbo DFE.  ...  This may present a problem with highly dispersive channels.  ... 
doi:10.1109/twc.2005.858037 fatcat:mhc5cbdpxje55n2qrzn24kynxi

Reliability-Based Turbo Detection

Jun Tao, Jingxian Wu, Yahong Rosa Zheng
2011 IEEE Transactions on Wireless Communications  
The proposed scheme performs iterative successive soft interference cancellation (SSIC) with a block decision-feedback equalizer (BDFE).  ...  Index Terms-Block decision-feedback equalizer (BDFE), multiple-input multiple-output (MIMO), reliability-based turbo detection, symbol reliability.  ...  The MAPbased equalizer, however, may incur a prohibitive complexity on the order of ( ( −1) ) , for highly dispersive channels with large .  ... 
doi:10.1109/twc.2011.052311.101753 fatcat:3qk2eo5g2jc4pfr7l7gxd3vhsi

Low Complexity Iterative Receiver Design for Shallow Water Acoustic Channels

C. P. Shah, C. C. Tsimenidis, B. S. Sharif, J. A. Neasham
2010 EURASIP Journal on Advances in Signal Processing  
An adaptive iterative receiver structure for the shallow underwater acoustic channel (UAC) is proposed using a decision feedback equalizer (DFE) and employing bit-interleaved coded modulation with iterative  ...  It has been demonstrated that there is a practical limit on the number of feedback taps that can be employed in the DFE and data recovery is possible even in cases where the channel impulse response (CIR  ...  For example, a channel equalizer should generate soft outputs so as to increase the efficiency of the soft input channel decoder.  ... 
doi:10.1155/2010/590458 fatcat:o4udlb7pq5hnhi7ccl57cupakq

Dropout compensation in magnetic tape channels by adaptive equalization and coding

B. Steingrimsson, J. Moon
2001 IEEE transactions on magnetics  
The equalizer closely approximates the performance of the optimal EPR4 equalizer.  ...  The complexity/performance tradeoffs of the PCPC code seem favorable compared to the low-density parity check code or to the turbo code.  ...  ACKNOWLEDGMENT The authors would like to thank B. Buchan of Seagate and R. Molstad of Imation for providing useful experimental data from commercial tape channels. The assistance of F. R. Rad and Y.  ... 
doi:10.1109/20.966136 fatcat:6iflvszehjckrgdzspz3vircmy

Editorial

Erdal Panayırcı, Costas Georghiades, Xiaodong Wang, Hakan A Çırpan
2005 EURASIP Journal on Wireless Communications and Networking  
While considerable previous work has addressed many aspects of this problem separately, for example, single-user channel equalization, interference suppression for multipleaccess channels, and tracking  ...  the theoretical optimum for fast and reliable communication in the highly severe and dynamic wireless environment.  ...  The paper by Lu et al., entitled "Factor-graph-based soft self-iterative equalizer for multipath channels," considers factor-graph-based soft self-iterative equalization in wireless multipath channels.  ... 
doi:10.1155/wcn.2005.79 fatcat:rhphaarogjbqdjldqbqa6syxim

Nonlinear BCJR equalizer for suppression of intrachannel nonlinearities in 40 Gb/s optical communications systems

Ivan B. Djordjevic, Bane Vasic
2006 Optics Express  
The MAP detector, based on Bahl-Cocke-Jelinek-Raviv algorithm, operates on the channel trellis, a dynamical model of intersymbol interference, and provides soft-decision outputs processed further in an  ...  The proposed scheme operates very well in the presence of strong intrachannel intersymbol interference, when other advanced forward error correction schemes fail, and it is also suitable for 40 Gb/s upgrade  ...  Rao for her involvement in an early stage of study of different schemes for suppression of intrachannel nonlinearities.  ... 
doi:10.1364/oe.14.004625 pmid:19516616 fatcat:yyryaognorcrvhiav3lshzwjky

Enhanced MIMO LMMSE Turbo Equalization: Algorithm, Simulations, and Undersea Experimental Results

Jun Tao, Jingxian Wu, Yahong Rosa Zheng, Chengshan Xiao
2011 IEEE Transactions on Signal Processing  
First, it performs hybrid soft interference cancellation (HSOIC) by subtracting the soft decisions of the interfering symbols, and the soft decisions are calculated by using a hybrid of the a priori information  ...  A low-complexity approximation of the enhanced MIMO LMMSE turbo equalization is also proposed to balance the tradeoff between complexity and performance.  ...  ACKNOWLEDGMENT The authors would like to thank Dr. J. Preisig and his team for conducting the SPACE08 experiment.  ... 
doi:10.1109/tsp.2011.2147782 fatcat:yx3gfectdvd7piirludj7qtsye

A Turbo FDE Technique for Reduced-CP SC-Based Block Transmission Systems

A. Gusmao, P. Torres, R. Dinis, N. Esteves
2007 IEEE Transactions on Communications  
In this letter, a soft-decision-directed correction (SDDC)-aided turbo FDE technique is presented for reduced-CP SC-based block transmission systems using conventional frame structures.  ...  For conventional cyclic-prefix (CP)-assisted block transmission systems, the CP length is selected on the basis of the expected maximum delay spread.  ...  even for channels which are both strongly time-dispersive and strongly time-varying, under a moderate complexity charge at the BSs.  ... 
doi:10.1109/tcomm.2006.887482 fatcat:y36iludgkrazdjglifre4n32ru

Low Complexity Turbo Space-Frequency Equalization For Single-Carrier Mimo Wireless Communications

Yi Huang, Ye Wu, Xu Zhu
2006 Zenodo  
Publication in the conference proceedings of EUSIPCO, Florence, Italy, 2006  ...  This is because TSFE can capture the most multipath channel energy among the three equalization methods when channels are highly dispersive.  ...  ., in a highly dispersive channel), however, TSFE outperforms TOFDM and TSTE.  ... 
doi:10.5281/zenodo.40072 fatcat:wvyqhkq275fljnyi4p6f5bmy2q

Neural Turbo Equalization: Deep Learning for Fiber-Optic Nonlinearity Compensation [article]

Toshiaki Koike-Akino, Ye Wang, David S. Millar, Keisuke Kojima, Kieran Parsons
2019 arXiv   pre-print
The proposed DNN-TEQ is constructed with nested deep residual networks (ResNet) to train extrinsic likelihood given soft-information feedback from channel decoding.  ...  In this paper, we propose a turbo equalization (TEQ) based on DNN as a new alternative framework to deal with nonlinear fiber impairments for future coherent optical communications.  ...  Although DNN has already been popular in nonlinear compensation, our paper is the first attempt to adopt DNN for TEQ in the framework of BICM-ID which takes soft-decision feedback from the FEC decoder  ... 
arXiv:1911.10131v1 fatcat:7ghe4qetcbejphjkftl54l3zeq

Turbo equalization

R. Koetter, A.C. Singer, M. Tuchler
2004 IEEE Signal Processing Magazine  
apitalizing on the tremendous per formance gains of turbo codes and the turbo decoding algorithm, turbo equalization is an iterative equalization and decoding technique that can achieve equally impressive  ...  In this article, we discuss the turbo equalization approach to coded data transmission over ISI channels, with an emphasis on the basic ideas and some of the practical details.  ...  The interleavers are included into the iterative update loop to further disperse the direct feedback effect.  ... 
doi:10.1109/msp.2004.1267050 fatcat:iijwemxti5b55hcp37ftpc634i

The performance of H263-based video telephony over turbo-equalized GSM/GPRS

P. Cherriman, Bee Leong Yeap, L. Hanzo
2002 IEEE transactions on circuits and systems for video technology (Print)  
The performance of turbo-equalized Global System of Mobile Communications/General Packet Radio Service (GSM/GPRS)-like videophone transceivers is studied over dispersive fading channels as a function of  ...  the number of turbo equalization iterations.  ...  SUMMARY AND CONCLUSIONS The performance of turbo-equalized GSM/GPRS-like videophone transceivers was studied over dispersive fading channels as a function of the number of turbo equalization iterations  ... 
doi:10.1109/tcsvt.2002.804898 fatcat:vaktmjm2f5e3jh5zmevet6drfq

Editorial

Luc Vandendorpe, Alex M. Haimovich, Ramesh Pyndiah
2005 EURASIP Journal on Advances in Signal Processing  
The exploitation of this redundancy, together with decoding, leads to joint source/channel decoding.  ...  In "On rate-compatible punctured turbo codes design," F. Babich et al. give a low-complexity method to optimize the puncturing pattern for rate-compatible punctured turbo codes.  ...  Moonen in "Turbo-per-tone equalization for ADSL systems." Here, the authors propose and demonstrate the benefits of a frequency-domain turbo equalizer. D.  ... 
doi:10.1155/asp.2005.759 fatcat:2bavylfqvbacdgfj5xkttz6fe4
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