Spatially-Coupled Codes for Channels with SNR Variation

Date

2018-11-01

Author

Esfahanizadeh, Homa
Hareedy, Ahmed
Wu, Ruiyi
Galbraith, Rick
Dolecek, Lara

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This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

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© 1965-2012 IEEE.In magnetic recording systems, consecutive sections experience different signal-to-noise ratios (SNRs). To perform error correction over these systems, one approach is to use an individual block code for each section. However, the performance over a section affected by a lower SNR is weaker compared to the performance over a section affected by a higher SNR. Spatially-coupled (SC) codes are a family of graph-based codes with capacity approaching performance and low latency decoding. An SC code is constructed by partitioning an underlying block code to several component matrices, and coupling copies of the component matrices together. The contribution of this paper is threefold. First, we present a new partitioning technique to efficiently construct SC codes with column weights 4 and 6. Second, we present an SC code construction for channels with SNR variation. Our SC code construction provides local error correction for each section by means of the underlying codes that cover one section each, and simultaneously, an added level of error correction by means of coupling among the underlying codes. Third, we introduce a low-complexity interleaving scheme specific to SC codes that further improves their performance over channels with SNR variation. Our simulation results show that our SC codes outperform individual block codes by more than one and two orders of magnitudes in the error floor region compared to the block codes with and without regular interleaving, respectively. This improvement is more pronounced by increasing the memory and column weight.

Subject Keywords

Error floor, low-density parity-check (LDPC) codes, magnetic recording (MR), minimum overlap (MO) partitioning, signal-to-noise ratio (SNR) variation, spatially-coupled (SC) codes

URI

https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85050971719&origin=inward
https://hdl.handle.net/11511/98469

Journal

IEEE Transactions on Magnetics

DOI

https://doi.org/10.1109/tmag.2018.2853087

Collections

Department of Electrical and Electronics Engineering, Article

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Citation Formats

H. Esfahanizadeh, A. Hareedy, R. Wu, R. Galbraith, and L. Dolecek, “Spatially-Coupled Codes for Channels with SNR Variation,” IEEE Transactions on Magnetics, vol. 54, no. 11, pp. 0–0, 2018, Accessed: 00, 2022. [Online]. Available: https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85050971719&origin=inward.