A 115mW 1Gbps QC-LDPC decoder ASIC for WiMAX in 65nm CMOS
Xiao Peng, Zhixiang Chen, Xiongxin Zhao, Dajiang Zhou, Satoshi Goto · 2011
Structured quasi-cyclic low-density parity-check (QC-LDPC) code is a part of many emerging wireless communication standards, such as WiMAX, WiFi and WPAN. This paper presents a high parallel decoder architecture for the QC-LDPC codes and the corresponding decoder ASIC for WiMAX system. Through utilizing the proposed fully parallel layered scheduling architecture, the decoder chip saves 22.2% memory bits and takes 24~48 clock cycles per iteration for different code rates. It occupies 3.36 mm2in SMIC 65nm CMOS, and realizes 1Gbps (1056Mbps) throughput at 1.2V, 110MHz and 10 iterations with the power 115mW and power efficiency 10.9pJ/bit/iteration. The energy/bit/iteration reduces 63.6% in normalized comparison with the state-of-art publication.