An LDPC decoder chip based on self-routing network for IEEE 802.16e applications

作者：Liu Chih Hao^*; Yen Shau Wei; Chen Chih Lung; Chang Hsie Chia; Lee Chen Yi; Hsu Yar Sun; Jou Shyh Jye

来源：IEEE Journal of Solid-State Circuits, 2008, 43(3): 684-694.

DOI：10.1109/JSSC.2007.916610

• decoder architectures
• IEEE 802.16
• iterative decoders
• LDPC codes
• phase-overlapping
• self-routing
• WiMax

An LDPC decoder chip fully compliant to IEEE 802.16e applications is presented. Since the parity check matrix can be decomposed into sub-matrices which are either a zero-matrix or a cyclic shifted matrix, a phase-overlapping message passing scheme is applied to update messages immediately, leading to enhance decoding throughput. With only one shifter-based permutation structure, a self-routing switch network is proposed to merge 19 different sub-matrix sizes as defined in IEEE 802.16e and enable parallel message to be routed without congestion. Fabricated in the 90 nm 1P9M CMOS process, this chip achieves 105 Mb/s at 20 iterations while decoding the rate-5/6 2304-bit code at 150 MHz operation frequency. To meet the maximum data rate in IEEE 802.16e, this chip operates at 109 MHz frequency and dissipates 186 mW at 1.0 V supply.

• 出版日期2008-3
• 单位清华大学