Log-Likelihood Ratio Controller for Bit-Patterned Media Recording 


Vol. 44,  No. 12, pp. 2191-2198, Dec.  2019
10.7840/kics.2019.44.12.2191


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  Abstract

Bit-patterned media recording (BPMR) is a possible future magnetic recording system with potential to extend areal density (AD) beyond 1 terabit per square inch. To achieve high AD, gaps between the islands that store bits of data must be reduced; however, this introduces significant issues such as intersymbol and intertrack interference. In this paper, an effective decoding scheme using a low-density parity check (LDPC) code, with a log-likelihood ratio (LLR) controller to improve bit error rate (BER) performance, has been introduced. The LLR controller modifies the LLR output of the LDPC decoder using coefficients obtained through the relationship between the syndrome and the parity check matrix. The syndrome is in fact not only a set of symptoms indicating errors but also indicates which parity check constraints (equations) have not been satisfied by the received codeword. Considering this property with the parity check matrix, the LLR controller generates an efficient coefficient and modifies the LDPC decoder LLR output. Using computer simulation, we have shown that the BER performance of this iterative LDPC decoding scheme, with the LLR controller, is superior to that of both the LDPC alone and the iterative LDPC decoding scheme without the LLR controller.

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  Cite this article

[IEEE Style]

S. Jeong and J. Lee, "Log-Likelihood Ratio Controller for Bit-Patterned Media Recording," The Journal of Korean Institute of Communications and Information Sciences, vol. 44, no. 12, pp. 2191-2198, 2019. DOI: 10.7840/kics.2019.44.12.2191.

[ACM Style]

Seongkwon Jeong and Jaejin Lee. 2019. Log-Likelihood Ratio Controller for Bit-Patterned Media Recording. The Journal of Korean Institute of Communications and Information Sciences, 44, 12, (2019), 2191-2198. DOI: 10.7840/kics.2019.44.12.2191.

[KICS Style]

Seongkwon Jeong and Jaejin Lee, "Log-Likelihood Ratio Controller for Bit-Patterned Media Recording," The Journal of Korean Institute of Communications and Information Sciences, vol. 44, no. 12, pp. 2191-2198, 12. 2019. (https://doi.org/10.7840/kics.2019.44.12.2191)

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pISSN : 1226 - 4717
eISSN : 2287 - 3880