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Improving the Decoding Threshold of Tailbiting Spatially Coupled LDPC Codes by Energy Shaping

Thomas Jerkovits, Gianluigi Liva, Alexandre Graell i Amat
2018 IEEE Communications Letters  
by allowing the use of different transmission energies for the codeword bits.  ...  We show how the iterative decoding threshold of tailbiting spatially coupled (SC) low-density parity-check (LDPC) code ensembles can be improved over the binary input additive white Gaussian noise channel  ...  The idea of improving the BP threshold of protographbased low-density parity-check (LDPC) code ensembles [12] by means of different transmission energies was originally proposed in [13] .  ... 
doi:10.1109/lcomm.2018.2802488 fatcat:cxbhxgo6pneprmacrtkugi32rq

Construction of Adaptive Short LDPC Codes for Distributed Transmit Beamforming [article]

Ismail Shakeel, Ishtiaq Ahmad, Hajime Suzuki
2018 arXiv   pre-print
The performance of some of the codes constructed using the proposed scheme is evaluated and compared with the uncoded and other coded-DTB systems.  ...  This feature of the proposed scheme allows the DTB system to optimise its system resources, improve throughput and communicate reliably under large variation of different channel environments.  ...  The authors would like to acknowledge Dr Gerald Bolding (DST Group) for the valuable suggestions made to improve the P-LDPC code construction scheme described in this paper.  ... 
arXiv:1807.03526v2 fatcat:qfyybevsnjbxddsrha5hdaolca

Protograph-based LDPC code design for bit-metric decoding

Fabian Steiner, Georg Bocherer, Gianluigi Liva
2015 2015 IEEE International Symposium on Information Theory (ISIT)  
The constructed codes perform as good as multi-edge type codes of Zhang and Kschischang (2013) .  ...  The approach jointly optimizes the LDPC code node degrees and the mapping of the coded bits to the bit-interleaved coded modulation (BICM) bit-channels.  ...  Recently, a protograph-based coded modulation scheme was introduced in [19] by performing a one-to-one mapping between the constellation symbols and the codeword symbols of a nonbinary protograph LDPC  ... 
doi:10.1109/isit.2015.7282623 dblp:conf/isit/SteinerBL15 fatcat:5siqtt6eyfgilk3yqibokkb2ui

Protograph-Based LDPC Code Design for Bit-Metric Decoding [article]

Fabian Steiner and Georg Böcherer and Gianluigi Liva
2015 arXiv   pre-print
The constructed codes perform as good as multi-edge type codes of Zhang and Kschischang (2013).  ...  The approach jointly optimizes the LDPC code node degrees and the mapping of the coded bits to the bit-interleaved coded modulation (BICM) bit-channels.  ...  Recently, a protograph-based coded modulation scheme was introduced in [15] by performing a one-to-one mapping between the constellation symbols and the codeword symbols of a nonbinary protograph LDPC  ... 
arXiv:1501.05595v1 fatcat:3gzfmc7otfci5pa4pxkbm57raq

PG-LDPCC Codes in Turbo Equalizer Systems: Trade-Off between Design Parameters of the Protograph and the Permutation Size

Patrick Grosa, Gerhard Fettweis
2013 2013 IEEE 78th Vehicular Technology Conference (VTC Fall)  
The performance achievable can be improved by adjusting the components regarding each other.  ...  Along with the permutation size P and the protograph parameters (ms, L), it is possible to make a fair comparison between the codes and to decide in favor of the code used to achieve the desired requirements  ...  ACKNOWLEDGEMENT This work was supported by the Deutsche Forschungsgemeinschaft (DFG) within the UKoLoS framework under grant SPP 1202/3.  ... 
doi:10.1109/vtcfall.2013.6692361 dblp:conf/vtc/GrosaF13 fatcat:7vbwvtdqh5hnpkg45q67cm2wye

Optimized Uniform Scalar Quantizers of Ternary ADCs for Large-Scale MIMO Communications

Thuy V. Nguyen
2021 IEEE Access  
decoding thresholds of pragmatic protograph low-density parity-check codes (LDPC), and the frame error rate (FER)/ bit error rate (BER).  ...  The LS-MIMO systems' performance with the proposed T-ADCs is substantially improved over the conventional 3-σ uniform scalar quantizer in three different performance metrics -achievable rates, iterative  ...  BER/FER PERFORMANCE EVALUATIONS In this section, the proto-matrix of the protograph LDPC code given in (44) is now used to construct a derived LDPC code by performing the copy-and-permutation operation  ... 
doi:10.1109/access.2021.3094133 fatcat:lfh5yvohpjcelgvqssokpla5fe

Joint Early Stopping Criterions for Protograph LDPC Codes-Based JSCC System in Images Transmission

Zhiping Xu, Lin Wang, Shaohua Hong
2021 Entropy  
coding (JSCC) systems in images transmission to reduce the decoding complexity and decrease the decoding delay.  ...  In this paper, a joint early stopping criterion based on cross entropy (CE), named joint CE criterion, is presented for double-protograph low-density parity-check (DP-LDPC) codes-based joint source-channel  ...  By the use of the unequal power allocation method, the DP-LDPC JSCC system can obtain better performance [8] .  ... 
doi:10.3390/e23111392 pmid:34828090 pmcid:PMC8622890 fatcat:jegddw4kavek3nfj55px6sb5cy

Protograph LDPC Code Design For LS-MIMO 1-bit ADC Systems

Thuy Van Nguyen, Hung Ngoc Dang
2021 REV Journal on Electronics and Communications  
Hence, we perform a re-design of the P-LDPC codes for the above systems in this paper.  ...  The new codes demonstrate a good coding gain from 0:3 dB at rate 1/2 to 0:5 dB at rate 2/3 in different LS-MIMO configurations with 1-bit ADC.  ...  In Section 3, an improved version of the PEXIT algorithm is proposed and used as the main component in the design framework of protograph LDPC codes.  ... 
doi:10.21553/rev-jec.266 fatcat:cobjgbhegrckdm62yksmqkd6gi

On LDPC Code Based Massive Random-Access Scheme for the Gaussian Multiple Access Channel [article]

Luiza Medova, Anton Glebov, Pavel Rybin, Alexey Frolov
2018 arXiv   pre-print
In this paper we are concentrated on the third part of considered scheme. We generalized the PEXIT charts to optimize the protograph of LDPC code for Gaussian MAC.  ...  Vem et al in 2017, that leads to the better performance of overall transmission system.  ...  But since the usual EXIT analysis cannot be applied to the study of protograph-based [12] LDPC codes we will use a modified EXIT analysis for protograph-based LDPC codes (PEXIT) [13] .  ... 
arXiv:1803.08377v1 fatcat:xvijj6tllvalph6pmiq5q7uewq

Protograph-Based Raptor-Like LDPC Codes [article]

Tsung-Yi Chen, Kasra Vakilinia, Dariush Divsalar, Richard D. Wesel
2014 arXiv   pre-print
The PBRL codes also perform comparably to DVB-S2 codes even though the DVB-S2 codes use LDPC codes with longer blocklengths and are concatenated with outer BCH codes.  ...  This paper proposes a class of rate-compatible LDPC codes, called protograph-based Raptor-like (PBRL) codes. The construction is focused on binary codes for BI-AWGN channels.  ...  For long-blocklength codes, optimization using density evolution provides useful guidance to improve the performance of the PBRL code.  ... 
arXiv:1403.2111v1 fatcat:d5j4njlen5ek3nkzjgwb7645iq

Performance Analysis of Protograph-based LDPC Codes with Spatial Diversity [article]

Yi Fang, Pingping Chen, Lin Wang, Francis C. M. Lau, Kai-Kit Wong
2012 arXiv   pre-print
This paper studies the performance of protograph-based low-density parity-check (LDPC) codes with receive antenna diversity.  ...  We first propose a modified version of the protograph extrinsic information transfer (PEXIT) algorithm and use it for deriving the threshold of the protograph codes in a single-input multiple-output (SIMO  ...  We conclude that while the error performance of the protograph codes improves with the diversity order, the rate of improvement is reduced as the diversity order becomes larger.  ... 
arXiv:1208.2394v1 fatcat:ta4vjvfsvncvzg47xsulbiu7ym

Performance analysis of protograph-based low-density parity-check codes with spatial diversity

Y. Fang, P. Chen, L. Wang, K.-K. Wong, Francis C.M. Lau
2012 IET Communications  
This article studies the performance of protograph-based low-density parity-check (LDPC) codes with receive antenna diversity.  ...  The authors first propose a modified version of the protograph extrinsic information transfer algorithm and use it for deriving the threshold of the protograph codes in a SIMO system.  ...  We conclude that while the error performance of the protograph codes improves with the diversity order, the rate of improvement is reduced as the diversity order becomes larger.  ... 
doi:10.1049/iet-com.2012.0293 fatcat:7a3e6qhrgnahxlmhc4ay2t7lbu

Protograph-Based Raptor-Like LDPC Codes

Tsung-Yi Chen, Kasra Vakilinia, Dariush Divsalar, Richard D. Wesel
2015 IEEE Transactions on Communications  
This paper proposes protograph-based Raptor-like (PBRL) codes as a class of rate-compatible (RC) LDPC codes for binary-input AWGN channels.  ...  Performance is similar to RC code families designed by Nguyen et al. that do not constrain codes to have the PBRL structure and involve simulation in the optimization process at each rate.  ...  ACKNOWLEDGMENT The authors would like to thank Dr. Nguyen and Professor Nostratinia for sharing their numerical results of the error rate curves in [24] and [25] .  ... 
doi:10.1109/tcomm.2015.2404842 fatcat:h7djghoqmvaivmptbbe2b6q5om

Protograph-based Bit-Interleaved Coded Modulation: A Promising Bandwidth-Efficient Design Paradigm [article]

Yi Fang, Pingping Chen, Yong Liang Guan, Francis C. M. Lau, Yonghui Li, Guanrong Chen
2021 arXiv   pre-print
The BICM is able to approach Shannon capacity limits over various channels with the use of powerful forward-error-correction (FEC) codes, bit mappers (i.e., interleavers), and high-order modulations.  ...  Based on the natural serially-concatenated structure of BICM, iterative demapping and decoding (ID) can be adopted to boost the system performance.  ...  In contrast to conventional LDPC codes, a well-designed puncturing scheme not only increases the transmission rate but also improves the error performance of PB-LDPC codes [43] , [135] .  ... 
arXiv:2112.08557v1 fatcat:szkgba5muvedvbtbrcnfndcrom

Protograph LDPC Code Design for Asynchronous Random Access [article]

Federico Clazzer, Balazs Matuz, Sachini Jayasooriya, Mahyar Shirvanimoghaddam, Sarah J. Johnson
2019 arXiv   pre-print
of 10^-2 w.r.t. off-the-shelf codes.  ...  Starting from the observation that collisions between two users yield very specific interference patterns, we define a surrogate channel model and propose different protograph low-density parity-check  ...  ACKNOWLEDGMENTS The authors would like to thank Nina Grosheva for her support in the design of the asnychronous medium access simulation environment during its early stages.  ... 
arXiv:1908.01607v1 fatcat:6rp5xaemmrhadavfya5kxak2mq
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