For Full-Text PDF, please login, if you are a member of IEICE,|
or go to Pay Per View on menu list, if you are a nonmember of IEICE.
Improved Turbo Equalization Schemes Robust to SNR Estimation Errors
Qiang LI Wai Ho MOW Zhongpei ZHANG Shaoqian LI
IEICE TRANSACTIONS on Communications
Publication Date: 2007/06/01
Online ISSN: 1745-1345
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Wireless Communication Technologies
turbo equalization, SNR mismatch, Scaled Max-Log-Map equalization, switching equalization scheme, soft information,
Full Text: PDF(451.2KB)>>
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.