JOINT LLR-CRC ERROR MITIGATION FOR TWO-WAY ADAPTIVE DENOISE-AND-FORWARD NETWORK CODING  

作　　者：Cheng Yulun Yang Longxiang 

机构地区：[1]Jiangsu Key Lab of Wireless Communications, Nanjing University of Posts and Telecommunications [2]Key Lab of Broadband Wireless Communication and Sensor Network Technology, Ministry of Education, Nanjing University of Posts and Telecommunications

出　　处：《Journal of Electronics(China)》2013年第4期352-361,共10页电子科学学刊（英文版）

基　　金：Supported by the National 973 Programs (2013CB329104);the National Natural Science Foundations of China (No. 61071090, No. 61171093);the Postgraduate Innovation Programs of Scientific Research of Jiangsu Province (CXZZ11_0388);Jiangsu Province Natural Science Foundation Key Projects (11KJA510001);National Science and Technology Key Projects (2011ZX03005-004-003);Jiangsu 973 Projects (BK2011027)

摘　　要：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.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.

关 键 词：Network Coding （NC） Log-Likelihood Ratio （LLR） Cyclic Redundancy Code （CRC） Denoise-and-forward Pair-wise Error Probability （PEP） 

分 类 号：TP311.56[自动化与计算机技术—计算机软件与理论] TP311[自动化与计算机技术—计算机科学与技术]