Improving 3D-Turbo Code's BER Performance with a BICM System over Rayleigh Fading Channel

Classical Turbo code suffers from high error floor due to its small Minimum Hamming Distance (MHD). Newly-proposed 3D-Turbo code can effectively increase the MHD and achieve a lower error floor by adding a rate-1 post encoder. In 3D-Turbo codes, part of the parity bits from the classical Turbo encod...

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Bibliographic Details
Published in:Radioengineering Vol. 25; no. 4; pp. 790 - 800
Main Authors: Yao, R., Zhu, Y., Xu, J., Gao, F., Wang, L.
Format: Journal Article
Language:English
Published: Spolecnost pro radioelektronicke inzenyrstvi 01.12.2016
Subjects:
2D iterative soft demodulating-decoding algorithm
3D-Turbo code
Bit-Interleaved Coded Modulation (BICM)
key-bit protection
rotated mapping
ISSN:1210-2512
Online Access:Get full text
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Summary:Classical Turbo code suffers from high error floor due to its small Minimum Hamming Distance (MHD). Newly-proposed 3D-Turbo code can effectively increase the MHD and achieve a lower error floor by adding a rate-1 post encoder. In 3D-Turbo codes, part of the parity bits from the classical Turbo encoder are further encoded through the post encoder. In this paper, a novel Bit-Interleaved Coded Modulation (BICM) system is proposed by combining rotated mapping Quadrature Amplitude Modulation (QAM) and 3D-Turbo code to improve the Bit Error Rate (BER) performance of 3D-Turbo code over Raleigh fading channel. A key-bit protection scheme and a Two-Dimension (2D) iterative soft demodulating-decoding algorithm are developed for the proposed BICM system. Simulation results show that the proposed system can obtain about 0.8-1.0 dB gain at BER of 10^{-6}, compared with the existing BICM system with Gray mapping QAM.
ISSN:1210-2512
DOI:10.13164/re.2016.0790