Results 121 to 130 of about 285 (176)
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Analysis of balanced cycles of QC-LDPC codes
2011 Eighth International Conference on Wireless and Optical Communications Networks, 2011In this paper, we analyze balanced cycles of quasi-cyclic low-density parity-check (QC-LDPC) codes. We show the structure of balanced cycles and their necessary and sufficient existence conditions. Furthermore, we determine the minimal matrices of balanced cycle. Meanwhile we propose the property of B-girth in its mother matrix.
Gao Xiao, Zhang Nan
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Generalization of floor lifting for QC-LDPC codes
2017 IEEE East-West Design & Test Symposium (EWDTS), 2017The given paper presents a method for constructing a QC-LDPC code of shorter length by length adaption from a given QC-LDPC code of maximal length. The proposed method can be considered as a generalization of floor lifting. Making some offline calculation it is possible to construct a sequence of QC-LDPC codes with different circulant sizes generated ...
Vasiliy Usatyuk, Sergey Egorov
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Design of masking matrix for QC-LDPC codes
2013 IEEE Information Theory Workshop (ITW), 2013The masking matrix plays an important role in constructing new classes of regular and irregular quasi-cyclic low density parity check (QC-LDPC) codes. By coupling two identical graphs in a special way, we present a new structure of the masking matrix, whose Tanner graph can be seen as a protograph.
Yang Liu, Ying Li
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A Reaction Attack on the QC-LDPC McEliece Cryptosystem
2017Guo et al. recently presented a reaction attack against the QC-MDPC McEliece cryptosystem. Their attack is based on the observation that when a bit-flipping decoding algorithm is used in the QC-MDPC McEliece, then there exists a dependence between the secret matrix H and the failure probability of the bit-flipping algorithm.
Tomás Fabsic +5 more
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Compressing construction of QC-LDPC codes
2008 11th IEEE Singapore International Conference on Communication Systems, 2008Two compressing construction methods of quasi-cyclic LDPC (QC-LDPC) codes are proposed, which can be called recursive-compressing and single-compressing respectively. Selecting a good QC-LDPC code as the Mother, the son codes constructed through the compressing methods are still good codes, i.e., have high girth and few short cycles, moreover, they ...
null Shuqi Sun, null Wuyang Zhou
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Design and Implementation of a Universal QC-LDPC Encoder
2016This paper designed a programmable processor based on multiple instruction multiple data (MIMD) structure, to realize the quasi-cyclic low density parity check code (QC-LDPC) coding algorithm for the wireless LAN (WLAN) and the worldwide interoperability for microwave access (WIMAX).
Qian Yi, Han Jing
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2009 IEEE Circuits and Systems International Conference on Testing and Diagnosis, 2009
A multi-rate memory-efficient encoder for low-density parity-check (LDPC) codes is proposed in this paper based on shift-register-adder-accumulator (SRAA). The SRAA algorithm simplifies the encoder computation module and reduces the complexity of the operation. The LDPC code generator matrix is constructed by lots of quasi-cyclic square matrices in the
Huxing Zhang, Hongyang Yu
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A multi-rate memory-efficient encoder for low-density parity-check (LDPC) codes is proposed in this paper based on shift-register-adder-accumulator (SRAA). The SRAA algorithm simplifies the encoder computation module and reduces the complexity of the operation. The LDPC code generator matrix is constructed by lots of quasi-cyclic square matrices in the
Huxing Zhang, Hongyang Yu
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An Improved McEliece Cryptosystem Based on QC-LDPC Codes
2020In the original McEliece cryptosystem based on QC-LDPC codes, the decoding algorithm uses BF algorithm instead of BP algorithm, which reduces the time complexity but decreases the decoding performance. To solve this problem, we improve the original algorithm and use the Q-decoder which utilizes the correlation between the error pattern e and the matrix
Fan Bu +4 more
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Row Division Method to Generate QC-LDPC Codes
2009 Fifth Advanced International Conference on Telecommunications, 2009To cut down the hardware implementation cost this paper presents an efficient method to construct large girth Quasi-Cyclic low density parity check (QC-LDPC) codes. The row groups are paired two times the row weight, which has the complexity as compared to the connection of individual columns and rows.
Abid Yahya +3 more
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Adapted scheduling of QC-LDPC decoding for multistandard receivers
2012 7th International Symposium on Turbo Codes and Iterative Information Processing (ISTC), 2012Wireless and PLC standards have to cope with noisy channels. The advanced FEC codes like LDPC and turbo codes are the most competitive ones. Multi-standards devices (such as mobile phones with cellular and WiFi) are becoming more and more attractive but raise the issue of duplicating hardware.
Dion, Jean +4 more
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