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Modeling the bit-level stochastic correlation for turbo decoding

COMPUTER COMMUNICATIONS 2006年第18期29卷 3856-3862页

作者： Lin, Yi-Nan Hung, Wei-Wen Chen, Tsan-Jieh Lu, Erl-Huei Mingchi Univ Technol Dept Elect Engn Taipei Taiwan Chang Gung Univ Dept Elect Engn Tao Yuan Taiwan

After passing a systematic bit through a turbo encoder, the encoding process will introduce some extent of correlation between a systematic bit and its associated parity bits. However, this correlation is neglected in the subsequent turbo decoding process so as to reduce its computational complexity. In this paper, we try to explore the feasibility of modeling the bit-level stochastic correlation for the iterative turbo decoding. By properly adjusting the parameter of the correlation model, we can approximate various degrees of the underlying correlation within the received codewords. Reduction in bit error rate (BER) then may benefit from a more accurate capture of the correlation information at the cost of requiring only a small additional computation complexity. Experimental results indicate that incorporating the correlation model into the turbo decoding process can achieve better BER performance than that of conventional turbo decoders over AWGN channels. (C) 2006 Elsevier B.V. All rights reserved.

关键词： turbo encoder/decoder bit-level stochastic correlation model bit error rate (BER) computation complexity AWGN channel

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New Modified turbo decoder for Embedded Local Content in Single-Frequency Networks

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IEEE TRANSACTIONS ON BROADCASTING 2013年第1期59卷 129-135页

作者： Debessu, Yonas G. Wu, Hsiao-Chun Jiang, Hong Mukhopadhyay, Supratik Louisiana State Univ Sch Elect Engn & Comp Sci Baton Rouge LA 70803 USA Alcatel Lucent Bell Labs Murray Hill NJ 07974 USA

Current DVB-SH systems rely on hierarchical modulation to insert local content into the complementary ground component. The local content is inserted as a low priority bit stream, while the global content will be transmitted as a high-priority bit stream. At the receiver, the standard approach of extracting the local content from the received signal first requires detection of the global content. Subsequently, one can extract the local content by subtracting the coded and modulated form (restored version) of the detected global content from the received signal. In this paper, we propose a different approach to remove the global content from the received signal. In our new approach, a hybrid signal is designed to represent the turbo-coded global content, which contains decoded bits from the turbo decoder representing systematic bits, and detected bits from the received signal prior to the turbo decoder representing parity bits. This technique would relieve the receiver from performing coding and modulation on the detected global content so as to ensure a less computational burden and a smaller latency than the current technology. The obvious tradeoff between complexity and performance would imply higher bit error rates arising from our proposed system. Therefore, to mitigate the bit-error-rate performance degradation, we propose modifying the turbo decoder so that the systematic bit streams and the parity bit streams will be decoded differently with respect to their corresponding signal-to-noise ratios. Monte Carlo simulation results demonstrate that our proposed new scheme can achieve better computational efficiency and less latency in the slight sacrifice of error performance.

关键词： DVB-SH systems global content hierarchical modulation hybrid satellite and terrestrial single-frequency networks local content turbo encoder/decoder

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Modified turbo decoder for Local Content in Single-Frequency Networks

Modified Turbo Decoder for Local Content in Single-Frequency...

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IEEE International Symposium on Broadband Multimedia Systems and Broadcasting (BMSB)

作者： Debessu, Yonas G. Wu, Hsiao-Chun Jiang, Hong Rong, Bo Louisiana State Univ Dept Elect & Comp Engn Baton Rouge LA 70803 USA Alcatel Lucent Bell Labs Murray Hill NJ 07974 USA Commun Res Ctr Ottawa ON K2H 8S2 Canada

ISBN: (纸本)9781467302937

DVB-SH systems rely on hierarchical modulation to insert local content in the complementary ground component. The local content is inserted as a low priority (LP) bit stream, while the global content will be transmitted as a high-priority (HP) bit stream. At the receiver, the standard approach of extracting the local content from the received signal requires to detect the global content first. Henceforth, one can remove the global content by subtracting the coded and modulated signal of the detected stream from the received signal. In this paper, we propose and investigate a different approach of removing the global content from the received signal. In our new approach, a hybrid signal is designed, which contains (i) detected bits from the turbo decoder as systematic bits, and (ii) detected bits from the received signal prior to the turbo decoder as parity bits. This technique would relieve the receiver from performing coding and modulation on the detected global content so as to ensure less computational burden and a smaller latency than the current technology. The obvious tradeoff between complexity and performance would imply high bit error rates. Therefore, to mitigate the bit-error-rate performance degradation, we propose to modify the turbo decoder so that the systematic bit streams and the parity bit streams will be decoded differently with respect to their corresponding signal-to-noise ratios. Monte Carlo simulation results demonstrate that our proposed new scheme can achieve less computational complexity and latency in the slight sacrifice of error performance.

关键词： DVB-SH systems global content local content hierarchical modulation hybrid satellite and terrestrial single-frequency networks turbo encoder/decoder

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