Article
Multidisciplinary Sciences
Tianbo Xue
Summary: In this paper, a probabilistic channel model with correlated insertion and deletion errors is proposed to capture data dependence. The error performance and decoding complexity of a concatenated LDPC-marker code over the CID channel are investigated, and the forward backward decoding algorithm is modified for the CID channel. Compared to the conventional marker coding scheme, the concatenated LDPC-marker code improves error performance and reduces decoding complexity.
Article
Multidisciplinary Sciences
Tianbo Xue
Summary: This paper introduces a probabilistic channel model with correlated insertion and deletion errors for bit-patterned media recording systems and investigates the error performance and decoding complexity of a concatenated LDPC-marker code over the CID channel. By modifying the decoding algorithm and considering the data dependence, the LDPC-marker code shows improved performance and reduced decoding complexity on average.
Article
Engineering, Electrical & Electronic
Teng Lu, Xuan He, Peng Kang, Jiongyue Xing, Xiaohu Tang
Summary: This paper focuses on partitioning parity-check matrices (PCMs) to reduce hardware complexity and increase decoding throughput for row layered decoding of quasi-cyclic low-density parity-check (QC-LDPC) codes. The authors propose an optimization problem to minimize the maximum column weight of each layer while maintaining a block cyclic shift property among different layers. They present feasible solutions and a lower bound to evaluate an optimal solution. Additionally, they introduce a metric called layer distance to measure data dependency between consecutive layers and propose enumerative and greedy partition algorithms. The constructed codes demonstrate better error correction performance than the underlying 5G LDPC codes.
IEEE TRANSACTIONS ON COMMUNICATIONS
(2023)
Article
Telecommunications
Yunkai Hu, Peng Wang, Zihuai Lin, Ming Ding
Summary: This letter investigates the performance of a RIS-assisted wireless communication system where the signal transmitted from the transmitter is protected by LDPC codes. Analytical upper and lower bounds on the bit error probability of the system with LDPC-coded source signals are derived and validated through Monte Carlo simulations for various numbers of RIS reflecting elements.
IEEE COMMUNICATIONS LETTERS
(2021)
Article
Engineering, Electrical & Electronic
Yihuan Liao, Min Qiu, Jinhong Yuan
Summary: This paper investigates the design and performance of delayed bit-interleaved coded modulation (DBICM) with low-density parity-check (LDPC) codes, optimizing delay schemes to improve spectrum efficiency of DBICM. The study reveals that improvements in capacity due to delay coded bits mapping to real and imaginary parts of transmitted symbols are independent, and pairs of delay schemes with equal bit-channel capacity lead to equivalent DBICM capacity.
IEEE TRANSACTIONS ON COMMUNICATIONS
(2021)
Article
Mathematics
Jose Gomez-Torrecillas, F. J. Lobillo, Gabriel Navarro
Summary: The study introduces a decoding algorithm for linear codes over finite chain rings based on their parity check matrices, assuming prior knowledge of decoding algorithms over the residue field at each degree of the adic decomposition.
Article
Engineering, Electrical & Electronic
Qi-Yue Yu, Tang Li, Hong-Ru Lin, Feng-Feng Cao
Summary: This paper presents parity-check coding transmit diversity (PCTD) schemes based on half-rate invertible LDPC codes, which are capable of achieving both diversity and coding gains from the time-varying fading channels. By using a chase combining based message passing algorithm (CC-MPA), better bit-error-rate performance is achieved.
IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY
(2022)
Article
Engineering, Electrical & Electronic
Xin Xiao, Bane Vasic, Shu Lin, Juane Li, Khaled Abdel-Ghaffar
Summary: Gallager's pioneering work on LDPC codes dismissed codes with parity-check matrices of weight two, but showed that quasi-cyclic LDPC codes with column weight two have good capability to correct phased bursts of erasures. Modifications to the parity-check matrices of column weight two can enhance erasure correcting capability, while examples of codes based on Reed-Solomon and Gabidulin codes are presented for correcting phased bursts of erasures and performing well over AWGN channels.
IEEE TRANSACTIONS ON COMMUNICATIONS
(2021)
Article
Computer Science, Information Systems
Hee-Youl Kwak, Jae-Won Kim, Jong-Seon No
Summary: This paper optimizes the code parameters of finite-length SC-LDPC codes by extending the scaling law without constraints, showing that the coupling width w directly affects the performance curve slope and exploring trade-offs inherent in the code parameters. The scaling law allows for the determination of the optimal code parameter set for best finite-length performance, which varies depending on the coupling and uncoupled code lengths.
Article
Telecommunications
Yang Liu, Huiqin Du, Shancheng Zhao, Jinming Wen
Summary: This letter aims to improve the performance of LDPC coded spatial modulation by introducing delayed bit-interleaved coded spatial modulation (DBICSM). The LDPC-DBICSM encoding structure is presented, along with a non-iterative decoder that works on two blocks of received sequences for LDPC-BICSM. An estimated lower bound on the performance of LDPC-DBICSM is also provided. Extensive simulation results demonstrate the performance advantages of LDPC-DBICSM compared to LDPC-BICSM, with a performance gain of about 1.25 dB achieved at a BER of 10-8.
IEEE COMMUNICATIONS LETTERS
(2023)
Article
Engineering, Electrical & Electronic
Shan Cao, Ting Lin, Shunqing Zhang, Shugong Xu, Chuan Zhang
Summary: A unified decoding architecture is proposed to meet the decoding requirements for both control and data plane in 5G network deployment. A joint decoding algorithm is introduced to adapt to LDPC codes and polar codes by reordering basic decoding operations. A reconfiguration scheme is introduced to improve hardware utilization and decoding efficiency.
IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY
(2021)
Article
Computer Science, Hardware & Architecture
Ryo Shibata, Hiroyuki Yashima
Summary: In this letter, the authors study the use of low-density parity-check (LDPC) codes for noisy channels with insertion and deletion (ID) errors. They propose a design method for irregular LDPC codes that can obtain degree distributions for different noise levels. They examine the decoding performances of the designed codes and compare them with the symmetric information rates of cascaded ID-noisy channels. Furthermore, they investigate the relationship between decoding performance and the code structure of irregular LDPC codes.
IEICE TRANSACTIONS ON FUNDAMENTALS OF ELECTRONICS COMMUNICATIONS AND COMPUTER SCIENCES
(2022)
Article
Computer Science, Information Systems
Cheng-Hung Lin, Hsin-Hao Su, Tang-Syun Chen, Cheng-Kai Lu
Summary: This study presents the design of a reconfigurable LDPC decoder with good hardware sharing for various IEEE standards. The decoder supports 12 types of parity-check matrix and utilizes a switching network that enables flexible switching between different inputs. The chip implementation using TSMC 40 nm CMOS process achieves a core size of 1.312 mm x 1.312 mm, operating at a frequency of 117 MHz, and supports throughputs of 5.24 Gbps and 3.90 Gbsp for IEEE 802.11ad and 802.15.3c standards, respectively.
Article
Engineering, Electrical & Electronic
Ming Zhu, Ke Cui, Simeng Li, Lei Kong, Shibiao Tang, Jian Sun
Summary: This paper proposes a rate-compatible high-efficiency information reconciliation algorithm based on QC-LDPC codes and puncturing algorithms to address the bottleneck in high-speed QKD systems. In addition, the NMSA algorithm is optimized using a fast prototyping tool to achieve high throughput and low implementation complexity. Experimental results show that the design performs well in maintaining low error rates and achieving high throughput.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2022)
Article
Telecommunications
Yihuan Liao, Min Qiu, Jinhong Yuan
Summary: In this work, a novel windowed decoding algorithm for DBICM is proposed to improve the detection on all sub-blocks using extrinsic information, outperforming the original decoding based on numerical results.
IEEE COMMUNICATIONS LETTERS
(2021)
Article
Computer Science, Information Systems
Zaki Masood, Hosung Park, Han Seung Jang, Sunyong Yoo, Sokhee P. Jung, Yonghoon Choi
Summary: This article discusses the maximization of energy efficiency (EE) for distributed antenna systems based on simultaneous wireless information and power transfer (SWIPT), presenting a tradeoff between EE and spectral efficiency and proposing an algorithm to optimize power allocation. The proposed algorithm uses Lagrangian multiplier method and Karush-Kuhn-Tucker conditions to find the optimal solution without iterative computation, achieving maximum energy transfer through optimal power splitting ratio.
IEEE SYSTEMS JOURNAL
(2021)
Article
Computer Science, Information Systems
Junghyun Kim, Hyejin Ro, Hosung Park
Summary: In this letter, a deep learning-based detector DeepDM is proposed, which uses a concatenation of CNN and DNN to detect index bits and carrier bits separately. A loss function is used to approach the BER performance of the maximum likelihood detector. Through simulations, it is shown that DeepDM outperforms conventional detectors in terms of BER performance and computational complexity under the Rayleigh fading channel.
IEEE WIRELESS COMMUNICATIONS LETTERS
(2021)
Article
Computer Science, Information Systems
Haseong Kim, Hyunjee Lee, Hosung Park
Summary: The paper proposes a novel decoding method, which reduces computational complexity by using distributed CRC bits and decreases the number of estimations for information bits by early termination of decodings, while minimizing additional sorting operations. Simulation results demonstrate that this method significantly reduces computational complexity compared to conventional decoding.
Article
Engineering, Electrical & Electronic
Hee-Youl Kwak, Jae-Won Kim, Hosung Park, Jong-Seon No
Summary: This paper proposes an optimization method for protograph-based spatially coupled LDPC codes under window decoding. By introducing a new performance metric, the window mean parameter, the finite-length performance of the codes is improved, and a code family optimized for different window sizes is provided. Further investigation of the structural characteristics of the codes explains the performance improvement and enhances the understanding of SC-LDPC codes for window decoding.
IEEE TRANSACTIONS ON COMMUNICATIONS
(2022)
Article
Computer Science, Information Systems
Jaewha Kim, Chanki Kim, Hosung Park, Jong-Seon No
Summary: This letter proposes new protograph low-density parity-check (LDPC) codes with high code rates for block fading (BF) channels using resolvable block designs (RBDs). To analyze the performance of the proposed LDPC codes, an upper bound on the bit error rate (BER) is derived using the novel method called gamma evolution. Finally, numerical results demonstrate that the frame error rate (FER) of the proposed LDPC codes has a slope approaching the channel outage probability.
IEEE WIRELESS COMMUNICATIONS LETTERS
(2022)
Article
Telecommunications
Hee-Youl Kwak, Jae-Won Kim, Yongjune Kim, Sang-Hyo Kim, Jong-Seon No
Summary: This letter investigates the MS and NMS decoding algorithms for GLDPC codes. By employing the NMS decoding algorithm and optimizing the component PCM, the performance can be improved.
IEEE COMMUNICATIONS LETTERS
(2022)
Article
Computer Science, Information Systems
Sanghoon Kang, Yunfei Gao, Jaeho Jeong, Seong-Joon Park, Jae-Won Kim, Jong-Seon No, Hahyeon Jeon, Jeong Wook Lee, Sunghwan Kim, Hosung Park, Albert No
Summary: DNA data storage systems have made rapid progress with the introduction of error-correcting techniques, random access algorithms, and query systems. However, designing algorithms for such systems is challenging due to the unpredictable nature of errors and the high cost of experiments. Therefore, the development of a simulator that can mimic the error statistics of a DNA storage system is of great interest.
Article
Telecommunications
Kezhong Jin, Xuebing Cai, Jianing Du, Hosung Park, Zhenzhou Tang
Summary: This paper discusses the application of mmWave spectrum in 5G wireless communication systems and the challenges it faces. It proposes a multi-objective optimization problem and a novel algorithm to address the two key challenges in multiconnectivity enabled mmWave networks. Simulation results show that the proposed scheme achieves good performance in overall energy efficiency, fairness of user rate, and balance of mBSs traffic load.
IEEE TRANSACTIONS ON GREEN COMMUNICATIONS AND NETWORKING
(2022)
Article
Computer Science, Information Systems
Dae-Young Yun, Jae-Won Kim, Hee-Youl Kwak, Jong-Seon No
Summary: In this paper, the CC-PEG algorithm is proposed for lifting protograph GLDPC codes to improve decoding performance by concentrating local cycles at doped VNs and avoiding them at vulnerable undoped VNs. The algorithm collects edges causing the maximum undoped girth and selects the edge with the lowest concentrated cycle metric. Simulation results show a performance gain of up to 20 times lower frame error rate compared to conventional lifting algorithms.
Article
Biochemical Research Methods
Seong-Joon Park, Sunghwan Kim, Jaeho Jeong, Albert No, Jong-Seon No, Hosung Park
Summary: This study proposes encoding and decoding procedures for DNA storage. The encoding procedure utilizes a carefully designed low-density parity-check code to correct errors and dropouts efficiently. New clustering and alignment methods are applied to improve the decoding performance.
Article
Computer Science, Information Systems
Jaewha Kim, Jae-Won Kim, Hee-Youl Kwak, Jong-Seon No
Summary: This paper proposes a new code design technique, called partial doping, for improving generalized low-density parity-check (GLDPC) codes. The proposed technique allows for finer tuning of the code structure, resulting in a higher degree of freedom for optimization. Experimental results show that the partially doped GLDPC codes constructed using this technique outperform conventional GLDPC codes and are competitive with state-of-the-art protograph-based LDPC codes over the binary erasure channel.
Article
Computer Science, Information Systems
Hee-Youl Kwak, Jae-Won Kim, Jong-Seon No
Summary: This paper optimizes the code parameters of finite-length SC-LDPC codes by extending the scaling law without constraints, showing that the coupling width w directly affects the performance curve slope and exploring trade-offs inherent in the code parameters. The scaling law allows for the determination of the optimal code parameter set for best finite-length performance, which varies depending on the coupling and uncoupled code lengths.