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Low-Complexity Multi-Size Circular Shifter for QC-LDPC Decoder Based on Two Serial Barrel-Rotators
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 Title & Authors
Low-Complexity Multi-Size Circular Shifter for QC-LDPC Decoder Based on Two Serial Barrel-Rotators
Kang, Hyeong-Ju;
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The low-density parity-check(LDPC) code has been adopted in many communication standards due to its error correcting performance, and the quasi-cyclic LDPC(QC-LDPC) is widely used because of implementation easiness. In the QC-LDPC decoder, a cyclic-shifter is required to rotate data in various sizes. This kind of cyclic-shifters are called multi-size circular shifter(MSCS), and this paper proposes a low-complexity structure for MSCS. In the conventional serially-placed two barrel-rotators, the unnecessary multiplexers are revealed and removed, leading to low-complexity. The experimental results show that the area is reduced by about 12%.
LDPC decoder;QC-LDPC decoder;cyclic-shifter;multi-size circular shifter;
 Cited by
R. M. Tanner, D. Sridhara, A. Sridharan, T. E. Fuja, and D. J. Costello, Jr., “LDPC block and convolutional codes based on circulant matrics,” IEEE Transactions on Information Theory, vol. 50, no. 12, pp. 2966-2984, Dec. 2004. crossref(new window)

M. Rovini, G. Gentile, and L. Fanucci, “Multi-size circular shifting networks for decoders of structured LDPC codes,” Electronics Letters, vol. 43, no. 17, pp. 938-940, Aug. 2007. crossref(new window)

X. Chen, S. Lin, and V. Akella, “QSN—A simple circularshift network for reconfigurable quasi-cyclic LDPC decoders,” IEEE Transactions on Circuits and Systems—II: Express Briefs, vol. 57, no. 10, pp. 782-786, Oct. 2010. crossref(new window)

B. Xiang, D. Bao, S. Huang, and X. Zeng, “An 847—955 Mb/s 342—397 mW dual-path fully-overlapped QC-LDPC decoder for WiMAX system in 0.13 μm CMOS,” IEEE Journal of Solid-State Circuits, vol. 46, no. 6, pp. 1416-1432, Jun. 2011. crossref(new window)

D. Oh and K. K. Parhi, “Low-complexity switch network for reconfigurable LDPC decoders,” IEEE Transactions on Very Large Scale Integration(VLSI) Systems , vol. 18, no. 1, pp. 85-94, Jan. 2010. crossref(new window)