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8th International Conference on Electronic Measurement and Instruments

作者： Wang lanxun Li weizhen Hebei Univ Coll Elect & Informat Engn Baoding 071000 Peoples R China

ISBN: (纸本)1424411351

In Multiple Input and Multiple Output system of wireless communications, Space time coding using multiple transmit antennas is the attractive technique for high bit-rate and high capacity transmission. Methods for providing transmit diversity in communication over fading channels also been *** Space-Time Block codes has full diversity gain but not coding *** concatenation scheme of STBC codes and LDPC (STBC-LDPC) was proposed and it has been shown that the STBC-LDPC can achieve the good error rate performance and coding gain. low-density parity-check (LDPC) codes as it is the good error correcting codes achieving the near Shannon limit *** this paper, a concatenation scheme of LDPC codes and STBC which should apply full transmit rate with multiple transmit antennas is proposed. Refering to it as the ABBA-LDPC and *** evaluate the bit error rate (BER) of the two schemes in a quasi-static Rayleigh fading channel by the computer simulation. We show that the BER of the ABBA-LDPC is better than that of the STBC with same antennas in a quasi-static Rayleigh fading channel,and also it is better than OSTBC-LDPC which uses real constellation. When receive antennas increasing the diversity gain will be increasing too.

关键词： MIMO space time block code low density parity check code diversity real constellation complex constellation

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code Design of Space-Time Block codes coded low-density parity-check code and System Performance Analysis

Code Design of Space-Time Block Codes Coded Low-Density Pari...

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2007 8th International Conference on Electronic Measurement & Instruments（ICEMI’2007）

作者： Wang lanxun Li weizhen The College of Electronic and Information Engineering, HebeiUniversity, Baoding 071000 China

In Multiple Input and Multiple Output system of wireless communications, Space time coding using multiple transmit antennas is the attractive technique for high bit-rate and high capacity transmission. Methods for providing transmit diversity in communication over fading channels also been *** Space-Time Block codes has full diversity gain but not coding *** concatenation scheme of STBC codes and LDPC (STBC-LDPC) was proposed and it has been shown that the STBC-LDPC can achieve the good error rate performance and coding gain. low-density parity-check (LDPC) codes ,as it is the good error correcting codes achieving the near Shannon limit *** this paper, a concatenation scheme of LDPC codes and STBC which should apply full transmit rate with multiple transmit antennas is proposed. Refering to it as the ABBA-LDPC and *** evaluate the bit error rate (BER) of the two schemes in a quasi-static Rayleigh fading channel by the computer simulation. We show that the BER of the ABBA-LDPC is better than that of the STBC with same antennas in a quasi-static Rayleigh fading channel,and also it is better than OSTBC-LDPC which uses real constellation. When receive antennas increasing ,the diversity gain will be increasing too.

关键词： MIMO space time block code low density parity check code diversity real constellation complex constellation

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On CS Image Reconstruction Using LDPC code Over Radio Mobile Channel

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WIRELESS PERSONAL COMMUNICATIONS 2018年第2期100卷 401-427页

作者： Pramanik, Ankita Maity, Santi P. Indian Inst Engn Sci & Technol Sibpur India

In this work, the effect of additive white Gaussian noise and fading channel on the compressed sensing or compressive sampling (CS) image reconstruction process are demonstrated. First, the work suggests encoding of the sensed samples by low density parity check code (LDPC) before transmission. It is well known that longer is the length of the LDPC codes better (lower) is the bit error rate (BER) performance. Thus to improve CS reconstruction a method to construct a larger length but 4 cycle free irregular LDPC code structure is also proposed. The code construction is based on the LDPC code in IEEE WiMAX standard. The proposed CS-LDPC structure is then extended for \(4^n\)-QAM to find an optimal set of thresholds by minimizing BER (equivalently symbol error rate) using differential evolution (DE). The algorithm works on the log likelihood ratio values obtained by LDPC decoding. Extensive simulation results show the efficacy of the use of LDPC codes and the trade-off in code rate and measurements on reconstruction quality. Improved performance with the proposed DE based demodulation is also demonstrated.

关键词： Compressed sensing Differential evolution Kronecker product low density parity check code Optimal threshold

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On Non-Binary Constellations for Channel-coded Physical-Layer Network Coding

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IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS 2013年第1期12卷 312-319页

作者： Faraji-Dana, Zahra Mitran, Patrick Univ Waterloo Dept Elect & Comp Engn Waterloo ON N2L 3G1 Canada

We investigate channel-coded physical-layer network coding in a two-way relaying scenario, where the end nodes A and B choose their symbols, S-A and S-B, from a small non-binary field, F, and adopt a non-binary PSK modulation. The relay then directly decodes the network-coded combination aS(A) + bS(B) over F from the noisy received superimposed channel-encoded packets. The advantage of working over non-binary fields is that it offers the opportunity to decode according to multiple decoding coefficients (a, b). As only one of the network-coded combinations needs to be successfully decoded, a key advantage is then a reduction in error probability by attempting to decode against all choices of (a, b). In this paper, we compare different mappings between F and the PSK constellation, and prove that many have identical performance in terms of frame error rate (FER). Moreover, we derive a lower bound on the performance of decoding the network-coded combinations. Simulation results show that if we adopt either i) concatenated Reed-Solomon and convolutional coding or ii) low-density parity check codes, our non-binary constellations can outperform the binary case significantly in the sense of minimizing the FER and, in particular, the ternary constellation has the best FER performance among all considered cases.

关键词： Physical-layer network coding non-binary constellation mappers outage probability Reed Solomon Convolutional code concatenation low density parity check code

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Joint sparse graph over GF(q) for code division multiple access systems

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IET COMMUNICATIONS 2015年第5期9卷 707-718页

作者： Wen, Lei Su, Man Univ Surrey Ctr Commun Syst Res Guildford GU2 7XH Surrey England Natl Univ Def Technol Coll Elect Sci & Engn Guangzhou 410073 Guangdong Peoples R China

low-density signature code division multiple access (LDS-CDMA) and low-density parity-check (LDPC) code can both be represented by a single sparse graph. In this study, the authors propose a joint sparse graph (JSG) over GF(q) which combines LDS-CDMA and non-binary LDPC codes, namely JSG-CDMA. On the JSG, multiple accessing and channel coding are well-linked together, in addition, joint detection and decoding are performed by message passing algorithm. Two schedules for message updating on the JSG, that is, flooding and serial schedules, are, respectively, presented. To predict the convergence behaviour of the joint detection and decoding, they depict the iterative structure of the JSG-CDMA receiver and analyse its extrinsic information transfer chart. Key factors of JSG-CDMA include message passing schedule, maximum iteration number and Galois field order. Simulation results show that JSG-CDMA performs much better than conventional CDMA, in addition, compared with LDS-CDMA and turbo structured LDS-CDMA, at a bit error rate of 3 x 10(-4), JSG-CDMA brings about 1.9 and 1.1 dB gain, respectively.

关键词： code division multiple access parity check codes channel coding graph theory message passing radio receivers Galois fields turbo codes error statistics iterative decoding joint sparse graph low density signature code division multiple access low density parity check code nonbinary LDPC code channel coding message passing algorithm message updating iterative structure JSG-CDMA receiver turbo structured LDS-CDMA bit error rate GF decoding Galois field order

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A good performance watermarking LDPC code used in high-speed optical fiber communication system

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OPTICS COMMUNICATIONS 2015年 346卷 99-105页

作者： Zhang, Wenbo Li, Chao Zhang, Xiaoguang Xi, Lixia Tang, Xianfeng He, Wenxue Beijing Univ Posts & Telecommun Sch Sci Beijing 100876 Peoples R China Beijing Univ Posts & Telecommun State Key Lab Informat Photon & Opt Commun Beijing 100876 Peoples R China

A watermarking LDPC code, which is a strategy designed to improve the performance of the traditional LDPC code, was introduced. By inserting some pre-defined watermarking bits into original LDPC code, we can obtain a more correct estimation about the noise level in the fiber channel. Then we use them to modify the probability distribution function (PDF) used in the initial process of belief propagation (BP) decoding algorithm. This algorithm was tested in a 128 Gb/s PDM-DQPSK optical communication system and results showed that the watermarking LDPC code had a better tolerances to polarization mode dispersion (PMD) and nonlinearity than that of traditional LDPC code. Also, by losing about 2.4% of redundancy for watermarking bits, the decoding efficiency of the watermarking LDPC code is about twice of the traditional one. (C) 2015 Elsevier B.V. All rights reserved.

关键词： low density parity check code Watermarking Polarization mode dispersion Nonlinearity

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Efficient implementation technique of LDPC decoder

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ELECTRONICS LETTERS 2001年第20期37卷 1231-1232页

作者： Leung, WK Lee, WL Wu, A Ping, L City Univ Hong Kong Dept Elect Engn Kowloon Hong Kong Peoples R China

An efficient implementation technique of the low density parity check code decoder is proposed. Using the technique, the decoder ran be implemented with additions only and there is considerably lower complexity compar... 详细信息

关键词： efficient implementation technique LDPC decoder complexity reduction codes low density parity check code decoding additions computational complexity

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Parallel concatenated Gallager codes

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ELECTRONICS LETTERS 2000年第24期36卷 2025-2026页

作者： Behairy, H Chang, SC George Mason Univ Dept Elect & Comp Engn Fairfax VA 22030 USA

A class of concatenated codes called parallel concatenated Gallager codes (PCGCs) in which low density parity check (LDPC) codes are used as the component codes is presented. Simulation results for PCGCs that outperfo... 详细信息

关键词： AWGN channels low density parity check code AWGN channel parallel concatenated Gallager code concatenated codes

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Memory Size Reduction for LDPC Layered Decoders

Memory Size Reduction for LDPC Layered Decoders

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IEEE Asia Pacific Conference on Circuit and System (APCCAS)

作者： Zhao, Shuang Zhou, Xiaofang Ying, Fanglong Sobelman, Gerald E. Fudan Univ State Key Lab ASIC & Syst Shanghai 200433 Peoples R China Ningbo Univ Inst Circuits & Syst Ningbo Zhejiang Peoples R China Univ Minnesota Dept Elect & Comp Engn Minneapolis MN USA

ISBN: (纸本)9781424474561

LDPC coding has attracted much attention due to its high performance, and it has been widely used in telecommunication systems. This paper focuses on the decoder hardware architecture, especially on memory size reduction, which is an important part of the entire area cost. The design has been post-layout simulated using a UMC 0.18 micron technology at a clock speed of 74 MHz. Using the proposed 3-level memory structure together with the described control logic, the required number of bits of memory can be reduced by up to 34.9% compared to prior approaches.

关键词： LDPC low density parity check code decoder layered decoding hierarchical memory organization

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A High Performance Joint Detection and Decoding scheme for LDPC coded SCMA system

A High Performance Joint Detection and Decoding scheme for L...

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IEEE-Communications-Society Global Communications Conference on Trusted Communications with Physical Layer Security (IEEE GLOBECOM)

作者： Han, Kaining Zhang, Zhenbing Hu, Jianhao Chen, Jienan Univ Elect Sci & Technol China Natl Key Lab Commun Chengdu Sichuan Peoples R China

ISBN: (纸本)9781509024827

Sparse code Multiple Access (SCMA) is a promising candidate multiple access technology for the fifth generation (5G) mobile communication system. In this paper, we propose a factor graph based high performance Joint Detection and Decoding scheme (JDD) for the low density parity check code (LDPC) coded SCMA system. Also, we propose a message damping aided reduced complexity JDD scheme (RC-JDD) to achieve a lower complexity. According to the simulation results, the proposed JDD scheme has 2.6dB Bit Error Rate (BER) performance gain compared with the traditional methods and approximates to the single user detection performance bound with only 0.5dB loss. The RC-JDD scheme has only 10% complexity of JDD scheme with only 0.5dB loss. Thus the proposed RC-JDD scheme can be a good candidate for 5G system.

关键词： Joint Detection and Decoding Sparse code Multiple Access low density parity check code 5G

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