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JOINT LLR-CRC ERROR MITIGATION FOR TWO-WAY ADAPTIVE DENOISE-AND-FORWARD NETWORK CODING
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作者 Cheng Yulun Yang Longxiang 《Journal of Electronics(China)》 2013年第4期352-361,共10页
Network Coding (NC) brings correlation between the coded signals from different sources, which makes the system more vulnerable to the decode error at relay. Conventional Cyclic Redundancy Code (CRC) has been implemen... Network Coding (NC) brings correlation between the coded signals from different sources, which makes the system more vulnerable to the decode error at relay. Conventional Cyclic Redundancy Code (CRC) has been implemented for error bit detection. However, its error correction is simply ignored. To fully exploit this feature, this paper proposes a novel joint Log-Likelihood Ratio (LLR) CRC error mitigation for NC two way relay channel. Specific thresholds are designed to estimate the error number of data block and identify those which can be recovered if the number is within the error correction scope of CRC. We examine two modes of the thresholds, one based on the average Bit Error Rate (BER) of source-relay link, while the other based on that of instantaneous one. We provide the full analysis for the Pair-wise Error Probability (PEP) performance of the scheme. A variety of numerical results are presented to reveal the superiority of the proposed scheme to conventional CRC NC under independent Rayleigh fading channels. Moreover, the efficiencies of the proposed thresholds are also validated. 展开更多
关键词 Network coding (NC) Log-Likelihood Ratio (LLR) Cyclic Redundancy Code crc Denoise-and-forward Pair-wise Error Probability (PEP)
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Efficient Early Termination Strategy for LDPC Codes in GPS Systems
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作者 Feng Wang Jin-Hai Li +1 位作者 Jin-Hai Sun Yue-Peng Yan 《Journal of Harbin Institute of Technology(New Series)》 EI CAS 2013年第6期118-122,共5页
By exploiting the structural features of L1C messages,a novel Early Termination( ET) strategy is proposed to speed up the decoding of low-density parity-check( LDPC) codes in the GPS system. The proposed strategy is b... By exploiting the structural features of L1C messages,a novel Early Termination( ET) strategy is proposed to speed up the decoding of low-density parity-check( LDPC) codes in the GPS system. The proposed strategy is based on the cyclic redundancy check( CRC) of the messages in the subframes 2 and 3. The simulation results show that average number of iterations of the proposed strategy is less than that of the standard ET strategy,with nearly no degradation in decoding performance. Besides,the proposed ET strategy can be efficiently implemented in a sequential or parallel manner. Thus,the proposed ET strategy is attractive for practical purposes. 展开更多
关键词 GPS system low-density parity-check (LDPC) codes early termination (ET) strategy cyclic redundancy check crc)CLC number:TN911.22 Document code:AArticle ID:1005-9113(2013)06-0118-05
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