Design of a Multimode QC-LDPC Decoder Based on Shift-Routing Network
Chih-Hao Liu, Chien-Ching Lin, Shau-Wei Yen, Chih-Lung Chen, Hsie-Chia Chang, Chen‐Yi Lee, Yarsun Hsu, Shyh-Jye Jerry Jou · IEEE Transactions on Circuits & Systems II Express Briefs · 2009
A reconfigurable message-passing network is proposed to facilitate message transportation in decoding multimode quasi-cyclic low-density parity-check (QC-LDPC) codes. By exploiting the shift-routing network (SRN) features, the decoding messages are routed in parallel to fully support those specific 19 and 3 submatrix sizes defined in IEEE 802.16e and IEEE 802.11n applications with less hardware complexity. A 6.22- mm2QC-LDPC decoder with SRN is implemented in a 90-nm 1-Poly 9-Metal (1P9M) CMOS process. Postlayout simulation results show that the operation frequency can achieve 300 MHz, which is sufficient to process the 212-Mb/s 2304-bit and 178-Mb/s 1944-bit codeword streams for IEEE 802.16e and IEEE 802.11n systems, respectively.