Improved Turbo Equalization Schemes Robust to SNR Estimation Errors

Qiang LI; Wai Ho MOW; Zhongpei ZHANG; Shaoqian LI

doi:10.1093/ietcom/e90-b.6.1454

Improved Turbo Equalization Schemes Robust to SNR Estimation Errors

Qiang LI, Wai Ho MOW, Zhongpei ZHANG, Shaoqian LI

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An improved Max-Log-Map (MLM) turbo equalization algorithm called Scaled Max-Log-Map (SMLM) iterative equalization is presented. Simulations show that the scheme can dramatically outperform the MLM besides it is insensitive to SNR mismatch. Unfortunately, its performance is still much worse than that of Log-Map (LM) with exact SNR over high-loss channels. Accordingly, we also propose a new SNR estimation algorithm based on the reliability values of soft output extrinsic information of SMLM decoder. Using the new scheme, we obtain good performance close to that of LM with ideal knowledge of SNR.

Publication: IEICE TRANSACTIONS on Communications Vol.E90-B No.6 pp.1454-1459

Publication Date: 2007/06/01

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Online ISSN: 1745-1345

DOI: 10.1093/ietcom/e90-b.6.1454

Type of Manuscript: PAPER

Category: Wireless Communication Technologies

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Qiang LI, Wai Ho MOW, Zhongpei ZHANG, Shaoqian LI, "Improved Turbo Equalization Schemes Robust to SNR Estimation Errors" in IEICE TRANSACTIONS on Communications, vol. E90-B, no. 6, pp. 1454-1459, June 2007, doi: 10.1093/ietcom/e90-b.6.1454.
Abstract: An improved Max-Log-Map (MLM) turbo equalization algorithm called Scaled Max-Log-Map (SMLM) iterative equalization is presented. Simulations show that the scheme can dramatically outperform the MLM besides it is insensitive to SNR mismatch. Unfortunately, its performance is still much worse than that of Log-Map (LM) with exact SNR over high-loss channels. Accordingly, we also propose a new SNR estimation algorithm based on the reliability values of soft output extrinsic information of SMLM decoder. Using the new scheme, we obtain good performance close to that of LM with ideal knowledge of SNR.
URL: https://globals.ieice.org/en_transactions/communications/10.1093/ietcom/e90-b.6.1454/_p

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@ARTICLE{e90-b_6_1454,
author={Qiang LI, Wai Ho MOW, Zhongpei ZHANG, Shaoqian LI, },
journal={IEICE TRANSACTIONS on Communications},
title={Improved Turbo Equalization Schemes Robust to SNR Estimation Errors},
year={2007},
volume={E90-B},
number={6},
pages={1454-1459},
abstract={An improved Max-Log-Map (MLM) turbo equalization algorithm called Scaled Max-Log-Map (SMLM) iterative equalization is presented. Simulations show that the scheme can dramatically outperform the MLM besides it is insensitive to SNR mismatch. Unfortunately, its performance is still much worse than that of Log-Map (LM) with exact SNR over high-loss channels. Accordingly, we also propose a new SNR estimation algorithm based on the reliability values of soft output extrinsic information of SMLM decoder. Using the new scheme, we obtain good performance close to that of LM with ideal knowledge of SNR.},
keywords={},
doi={10.1093/ietcom/e90-b.6.1454},
ISSN={1745-1345},
month={June},}

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TY - JOUR
TI - Improved Turbo Equalization Schemes Robust to SNR Estimation Errors
T2 - IEICE TRANSACTIONS on Communications
SP - 1454
EP - 1459
AU - Qiang LI
AU - Wai Ho MOW
AU - Zhongpei ZHANG
AU - Shaoqian LI
PY - 2007
DO - 10.1093/ietcom/e90-b.6.1454
JO - IEICE TRANSACTIONS on Communications
SN - 1745-1345
VL - E90-B
IS - 6
JA - IEICE TRANSACTIONS on Communications
Y1 - June 2007
AB - An improved Max-Log-Map (MLM) turbo equalization algorithm called Scaled Max-Log-Map (SMLM) iterative equalization is presented. Simulations show that the scheme can dramatically outperform the MLM besides it is insensitive to SNR mismatch. Unfortunately, its performance is still much worse than that of Log-Map (LM) with exact SNR over high-loss channels. Accordingly, we also propose a new SNR estimation algorithm based on the reliability values of soft output extrinsic information of SMLM decoder. Using the new scheme, we obtain good performance close to that of LM with ideal knowledge of SNR.
ER -