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Doped low-density parity-check codes
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作者 Yong Li Rui Liu +3 位作者 Xianlong Jiao Youqiang Hu Zhen Luo Francis C.M.Lau 《Digital Communications and Networks》 SCIE CSCD 2024年第1期217-226,共10页
In this paper,we propose a doping approach to lower the error floor of Low-Density Parity-Check(LDPC)codes.The doping component is a short block code in which the information bits are selected from the coded bits of t... In this paper,we propose a doping approach to lower the error floor of Low-Density Parity-Check(LDPC)codes.The doping component is a short block code in which the information bits are selected from the coded bits of the dominant trapping sets of the LDPC code.Accordingly,an algorithm for selecting the information bits of the short code is proposed,and a specific two-stage decoding algorithm is presented.Simulation results demonstrate that the proposed doped LDPC code achieves up to 2.0 dB gain compared with the original LDPC code at a frame error rate of 10^(-6)Furthermore,the proposed design can lower the error floor of original LDPC Codes. 展开更多
关键词 LDPC codes Doped LDPC codes Tanner graph Quadratic residue codes Trapping sets
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Duadic Codes over the Ring Fq[u] /m- and Their Gray Images 被引量:1
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作者 Mokshi Goyal Madhu Raka 《Journal of Computer and Communications》 2016年第12期50-62,共14页
Let m ≥ 2 be any natural number and let be a finite non-chain ring, where and q is a prime power congruent to 1 modulo (m-1). In this paper we study duadic codes over the ring and their extensions. A Gray map from to... Let m ≥ 2 be any natural number and let be a finite non-chain ring, where and q is a prime power congruent to 1 modulo (m-1). In this paper we study duadic codes over the ring and their extensions. A Gray map from to is defined which preserves self duality of linear codes. As a consequence self-dual, formally self-dual and self-orthogonal codes over are constructed. Some examples are also given to illustrate this. 展开更多
关键词 Quadratic residue codes Duadic codes Extended Duadic-codes Gray Map SELF-DUAL Self-Orthogonal codes Formally Self-Dual codes
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A high-level synthesis based dual-module redundancy with multi-residue detection(DMR-MRD)fault-tolerant method for on-board processing satellite communication systems
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作者 杨文慧 Chen Xiang +2 位作者 Wang Yu Zhao Ming Wang Jing 《High Technology Letters》 EI CAS 2014年第3期245-252,共8页
On board processing(OBP) satellite systems have obtained more and more attentions in recent years because of their high efficiency and performance.However,the OBP transponders are very sensitive to the high energy par... On board processing(OBP) satellite systems have obtained more and more attentions in recent years because of their high efficiency and performance.However,the OBP transponders are very sensitive to the high energy particles in the space radiation environments.Single event upset(SEU)is one of the major radiation effects,which influences the satellite reliability greatly.Triple modular redundancy(TMR) is a classic and efficient method to mask SEUs.However,TMR uses three identical modules and a comparison logic,the circuit size becomes unacceptable,especially in the resource limited environments such as OBP systems.Considering that,a new SEU-tolerant method based on residue code and high-level synthesis(HLS) is proposed,and the new method is applied to FIR filters,which are typical structures in the OBP systems.The simulation results show that,for an applicable HLS scheduling scheme,area reduction can be reduced by 48.26%compared to TMR,while fault missing rate is 0.15%. 展开更多
关键词 single event upset (SEU) residue code triple modular redundancy (TMR) high-level synthesis (HLS) fault missing rate
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A NEW APPROACH TO DVC COMBINED WITH ROI EXTRACTION AND RESIDUAL VIDEO CODING FOR MULTIMEDIA SENSOR NETWORKS
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作者 Lin Zhaoxiao Sun Lijuan +1 位作者 Xiao Fu Wang Ruchuan 《Journal of Electronics(China)》 2013年第1期17-24,共8页
The Wyner-Ziv distributed video coding scheme is characterized for its intraframe encoder and interframe decoder which can also approach the efficiency of an interframe encoder-decoder system. In Wyner-Ziv residual co... The Wyner-Ziv distributed video coding scheme is characterized for its intraframe encoder and interframe decoder which can also approach the efficiency of an interframe encoder-decoder system. In Wyner-Ziv residual coding of video, the residual of a frame with respect to a reference frame is Wyner-Ziv encoded, which can reduces the input entropy and leads to a higher coding efficiency than directly encoding the original frame. In this paper, we propose a new approach of residual coding combined with Region Of Interest (ROI) extraction. Experimental results show that, the proposed scheme achieves better rate-distortion performance compared to conventional Wyner-Ziv coding scheme. 展开更多
关键词 Distributed Video Coding (DVC) Residual video coding Region Of Interest (ROI)
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Near-MDR Codes over Z_4
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作者 ZHANG Xiaoyan MAO Qili 《Wuhan University Journal of Natural Sciences》 CAS 2014年第1期79-83,共5页
In this paper, we define near-MDR (maximum distance with respect to rank) codes over the ring Z4 and prove that a linear code C over Z4 is near-MDR if and only if the torsion codes Tor(C)is near-MDS. Finally, the ... In this paper, we define near-MDR (maximum distance with respect to rank) codes over the ring Z4 and prove that a linear code C over Z4 is near-MDR if and only if the torsion codes Tor(C)is near-MDS. Finally, the generator matrices of all near-MDR codes over Z4 are given. 展开更多
关键词 linear code torsion code residue code almost-MDR code near-MDR code
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Vision algorithms for fixed-wing unmanned aerial vehicle landing system 被引量:9
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作者 FAN YanMing DING Meng CAO YunFeng 《Science China(Technological Sciences)》 SCIE EI CAS CSCD 2017年第3期434-443,共10页
Autonomous landing has become a core technology of unmanned aerial vehicle(UAV)guidance,navigation and control system
关键词 vision-based landing spectral residual sparse coding position and pose estimation orthogonal iteration
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Cyclic Code and Self-Dual Code over F2 + uF2 + u^2F2 被引量:2
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作者 FENG Qian Qian ZHOU Wei Gang 《Journal of Mathematical Research and Exposition》 CSCD 2009年第3期500-506,共7页
We give the structures of a cyclic code over ringR = F2 + uF2 + u^2F2 = {0, 1,u, u^2,v, v^2,uv, v^3},where u^3 = 0, of odd length and its dual code. For the cyclic code, necessary and sufficient conditions for the e... We give the structures of a cyclic code over ringR = F2 + uF2 + u^2F2 = {0, 1,u, u^2,v, v^2,uv, v^3},where u^3 = 0, of odd length and its dual code. For the cyclic code, necessary and sufficient conditions for the existence of self-dual code are provided. 展开更多
关键词 ring F2 uF2 u^2F2 cyclic code residue code torsion code self-dual code
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