Novel Algebraic Constructions of Nonbinary Structured LDPC Codes over Finite Fields

2008 ◽  
Author(s):  
Keke Liu ◽  
Zesong Fei ◽  
Jingming Kuang
Keyword(s):  
Finite Fields ◽  
Ldpc Codes ◽  
Algebraic Constructions

Quasi-Cyclic LDPC Codes on Cyclic Subgroups of Finite Fields

2011 ◽  
Vol 59 (9) ◽  
pp. 2330-2336 ◽  
Author(s):  
Li Zhang ◽  
Shu Lin ◽  
Khaled Abdel-Ghaffar ◽  
Zhi Ding ◽  
Bo Zhou
Keyword(s):  
Finite Fields ◽  
Ldpc Codes ◽  
Cyclic Subgroups

scholarly journals Design of Nonbinary LDPC Cycle Codes with Large Girth from Circulants and Finite Fields

2021 ◽  
Vol 2021 ◽  
pp. 1-11
Author(s):  
Hengzhou Xu ◽  
Huaan Li ◽  
Jixun Gao ◽  
Guixiang Zhang ◽  
Hai Zhu ◽  
...  
Keyword(s):  
Finite Fields ◽  
Gaussian Noise ◽  
Iterative Decoding ◽  
Additive White Gaussian Noise ◽  
Ldpc Codes ◽  
Parity Check ◽  
Undirected Graphs ◽  
Awgn Channel ◽  
Exponent Matrix ◽  
Large Girth

In this paper, we study a class of nonbinary LDPC (NBLDPC) codes whose parity-check matrices have column weight 2, called NBLDPC cycle codes. We propose a design framework of 2 , ρ -regular binary quasi-cyclic (QC) LDPC codes and then construct NBLDPC cycle codes of large girth based on circulants and finite fields by randomly choosing the nonzero field elements in their parity-check matrices. For enlarging the girth values, our approach is twofold. First, we give an exhaustive search of circulants with column/row weight ρ and design a masking matrix with good cycle distribution based on the edge-node relation in undirected graphs. Second, according to the designed masking matrix, we construct the exponent matrix based on finite fields. The iterative decoding performances of the constructed codes on the additive white Gaussian noise (AWGN) channel are finally provided.

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