Analysis of Absorbing Sets and Fully Absorbing Sets of Array-Based LDPC Codes
The class of low-density parity-check (LDPC) codes is attractive, since such codes can be decoded using practical message-passing algorithms, and their performance is known to approach the Shannon limits for suitably large block lengths. For the intermediate block lengths relevant in applications, h...
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          | Published in | IEEE transactions on information theory Vol. 56; no. 1; pp. 181 - 201 | 
|---|---|
| Main Authors | , , , , | 
| Format | Journal Article | 
| Language | English | 
| Published | 
        New York, NY
          IEEE
    
        01.01.2010
     Institute of Electrical and Electronics Engineers The Institute of Electrical and Electronics Engineers, Inc. (IEEE)  | 
| Subjects | |
| Online Access | Get full text | 
| ISSN | 0018-9448 1557-9654  | 
| DOI | 10.1109/TIT.2009.2034781 | 
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| Abstract | The class of low-density parity-check (LDPC) codes is attractive, since such codes can be decoded using practical message-passing algorithms, and their performance is known to approach the Shannon limits for suitably large block lengths. For the intermediate block lengths relevant in applications, however, many LDPC codes exhibit a so-called ¿error floor,¿ corresponding to a significant flattening in the curve that relates signal-to-noise ratio (SNR) to the bit-error rate (BER) level. Previous work has linked this behavior to combinatorial substructures within the Tanner graph associated with an LDPC code, known as (fully) absorbing sets. These fully absorbing sets correspond to a particular type of near-codewords or trapping sets that are stable under bit-flipping operations, and exert the dominant effect on the low BER behavior of structured LDPC codes. This paper provides a detailed theoretical analysis of these (fully) absorbing sets for the class of Cp , ¿ array-based LDPC codes, including the characterization of all minimal (fully) absorbing sets for the array-based LDPC codes for ¿ = 2,3,4 , and moreover, it provides the development of techniques to enumerate them exactly. Theoretical results of this type provide a foundation for predicting and extrapolating the error floor behavior of LDPC codes. | 
    
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| AbstractList | The class of low-density parity-check (LDPC) codes is attractive, since such codes can be decoded using practical message-passing algorithms, and their performance is known to approach the Shannon limits for suitably large block lengths. For the intermediate block lengths relevant in applications, however, many LDPC codes exhibit a so-called "error floor," corresponding to a significant flattening in the curve that relates signal-to-noise ratio (SNR) to the bit-error rate (BER) level. Previous work has linked this behavior to combinatorial substructures within the Tanner graph associated with an LDPC code, known as (fully) absorbing sets. These fully absorbing sets correspond to a particular type of near-codewords or trapping sets that are stable under bit-flipping operations, and exert the dominant effect on the low BER behavior of structured LDPC codes. This paper provides a detailed theoretical analysis of these (fully) absorbing sets for the class of $C_{p, gamma}$ array-based LDPC codes, including the characterization of all minimal (fully) absorbing sets for the array-based LDPC codes for $gamma = 2,3,4$, and moreover, it provides the development of techniques to enumerate them exactly. Theoretical results of this type provide a foundation for predicting and extrapolating the error floor behavior of LDPC codes. [PUBLICATION ABSTRACT] The class of low-density parity-check (LDPC) codes is attractive, since such codes can be decoded using practical message-passing algorithms, and their performance is known to approach the Shannon limits for suitably large block lengths. For the intermediate block lengths relevant in applications, however, many LDPC codes exhibit a so-called ¿error floor,¿ corresponding to a significant flattening in the curve that relates signal-to-noise ratio (SNR) to the bit-error rate (BER) level. Previous work has linked this behavior to combinatorial substructures within the Tanner graph associated with an LDPC code, known as (fully) absorbing sets. These fully absorbing sets correspond to a particular type of near-codewords or trapping sets that are stable under bit-flipping operations, and exert the dominant effect on the low BER behavior of structured LDPC codes. This paper provides a detailed theoretical analysis of these (fully) absorbing sets for the class of Cp , ¿ array-based LDPC codes, including the characterization of all minimal (fully) absorbing sets for the array-based LDPC codes for ¿ = 2,3,4 , and moreover, it provides the development of techniques to enumerate them exactly. Theoretical results of this type provide a foundation for predicting and extrapolating the error floor behavior of LDPC codes. The class of low-density parity-check (LDPC) codes is attractive, since such codes can be decoded using practical message-passing algorithms, and their performance is known to approach the Shannon limits for suitably large block lengths. For the intermediate block lengths relevant in applications, however, many LDPC codes exhibit a so-called "error floor," corresponding to a significant flattening in the curve that relates signal-to-noise ratio (SNR) to the bit-error rate (BER) level. Previous work has linked this behavior to combinatorial substructures within the Tanner graph associated with an LDPC code, known as (fully) absorbing sets. These fully absorbing sets correspond to a particular type of near-codewords or trapping sets that are stable under bit-flipping operations, and exert the dominant effect on the low BER behavior of structured LDPC codes. This paper provides a detailed theoretical analysis of these (fully) absorbing sets for the class of C p , g array-based LDPC codes, including the characterization of all minimal (fully) absorbing sets for the array-based LDPC codes for g = 2,3,4 , and moreover, it provides the development of techniques to enumerate them exactly. Theoretical results of this type provide a foundation for predicting and extrapolating the error floor behavior of LDPC codes. The class of low-density parity-check (LDPC) codes is attractive, since such codes can be decoded using practical message-passing algorithms, and their performance is known to approach the Shannon limits for suitably large block lengths. For the intermediate block lengths relevant in applications, however, many LDPC codes exhibit a so-called "error floor," corresponding to a significant flattening in the curve that relates signal-to-noise ratio (SNR) to the bit-error rate (BER) level. Previous work has linked this behavior to combinatorial substructures within the Tanner graph associated with an LDPC code, known as (fully) absorbing sets. These fully absorbing sets correspond to a particular type of near-codewords or trapping sets that are stable under bit-flipping operations, and exert the dominant effect on the low BER behavior of structured LDPC codes. This paper provides a detailed theoretical analysis of these (fully) absorbing sets for the class of C p , gamma array-based LDPC codes, including the characterization of all minimal (fully) absorbing sets for the array-based LDPC codes for gamma = 2,3,4 , and moreover, it provides the development of techniques to enumerate them exactly. Theoretical results of this type provide a foundation for predicting and extrapolating the error floor behavior of LDPC codes.  | 
    
| Author | Wainwright, M.J. Dolecek, L. Zhengya Zhang Nikolic, B. Anantharam, V.  | 
    
| Author_xml | – sequence: 1 givenname: L. surname: Dolecek fullname: Dolecek, L. organization: Electr. Eng. & Comput. Sci. Dept., Massachusetts Inst. of Technol., Cambridge, MA, USA – sequence: 2 surname: Zhengya Zhang fullname: Zhengya Zhang organization: Dept. of Electr. Eng. & Comput. Sci., Univ. of California, Berkeley, CA, USA – sequence: 3 givenname: V. surname: Anantharam fullname: Anantharam, V. organization: Electr. Eng. & Comput. Sci. Dept., Univ. of California, Berkeley, CA, USA – sequence: 4 givenname: M.J. surname: Wainwright fullname: Wainwright, M.J. organization: Electr. Eng. & Comput. Sci. Dept., Univ. of California, Berkeley, CA, USA – sequence: 5 givenname: B. surname: Nikolic fullname: Nikolic, B. organization: Electr. Eng. & Comput. Sci. Dept., Univ. of California, Berkeley, CA, USA  | 
    
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| Keywords | Bit flipping Bit error rate near-codeword Theoretical study error floor Tanner graph Decoding Absorbing set Combinatorial method Trapping message passing decoding Flattening Message passing Algorithm performance low-density parity-check (LDPC ) codes Error correcting code Parity check codes trapping set bit-flipping Signal to noise ratio  | 
    
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| SubjectTerms | Absorbing set Absorption Algorithm design and analysis Algorithms Applied sciences Bit error rate bit-flipping Blocking Codes Coding, codes Combinatorial analysis Decoding error floor Errors Exact sciences and technology Extrapolation Flattening Floors Foundations Information theory Information, signal and communications theory low-density parity-check (LDPC ) codes Materials science and technology Message passing message passing decoding near-codeword Parity check codes Performance analysis Semiconductor materials Signal and communications theory Signal to noise ratio Substructures Telecommunications and information theory trapping set  | 
    
| Title | Analysis of Absorbing Sets and Fully Absorbing Sets of Array-Based LDPC Codes | 
    
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