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Author: search.filters.author.Prasartkaew, ChutimaSubject: search.filters.subject.Irregular LDPC codes

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    Combined coding algorithm of LDPC codes in bit-patterned media recording channels
    (2014-01-01)
    Prasartkaew, Chutima
    ;
    Kovintavewat, Piya
    ;
    Choomchuay, Somsak
    This paper presents a new coding algorithm of irregular low-density parity-check (LDPC) codes. This algorithm consists of two parts of block codes; parity bits was encoded using the magic square based algorithm (MSBA) which suitable for the short block (less than 500 bits) and the data bits, the rest part of all block codes, was encoded using the random number table. This proposed coding algorithm is called 'Combined Coding Algorithm LDPC codes (CCA-LDPC codes)' which can be used in bit-patterned media recording (BPMR) channels. The performance of the constructed codes was numerically simulated in BPMR channels model. The obtained performance of the proposed codes was compared with the comparable existing codes. The simulation results show that, at a block length of 4110 bit and code rate of 0.9, the proposed CCALDPC codes yields better performance than the existing ones, especially at high signal-to-noise ratio scenario. © (2014) Trans Tech Publications, Switzerland.
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    Parity check matrix construction via Magic Square Based Algorithm
    (2012-12-01)
    Prasartkaew, Chutima
    ;
    Choomchuay, Somsak
    This paper presents a construction algorithm for the short block irregular LDPC codes. By applying a magic square theorem as a part of the matrix construction, a newly developed algorithm, the so-called Magic Square Based Algorithm (MSBA), is obtained. The modified array codes are focused on in this study since the reduction of 1s can lead to simple encoding and decoding schemes. Simulation results based on AWGN channels show that with the code rate of 0.8 and SNR = 5 dB, the BER of 10<sup>-7</sup> can be obtained whilst the number of decoding iteration is relatively low. © 2012 IEEE.