Publisher : The Korean Institute of Information and Commucation Engineering
DOI : 10.6109/jkiice.2015.19.8.1839
Title & Authors
Low-Complexity Multi-Size Circular Shifter for QC-LDPC Decoder Based on Two Serial Barrel-Rotators Kang, Hyeong-Ju;
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%.
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.
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.
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.
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.
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.