An Energy-efficient High-throughput Multi-rate QC- LDPC Decoder Supporting G.hn Applications

In this paper , an LDPC decoder fully compliant to the G.hn standard is presented. The decoder implements one kind of Layered Decoding Algorithm – turbo decoding massage passing (TDMP) algorithm for Quasi-Cyclic LDPC codes. A simple early termination strategy is presented to significantly increase the throughput and reduce the power consumption. Partially parallel architecture with an overlapped mechanism is proposed to improve the hardware efficiency. For the newly published standard G.hn, the uppermost expansion factor supported is 360 which is much larger than that in the 802.16e standard which brings higher throughput. In the architecture, look-up tables replace the permutation network to further reduce hardware complexity. Based on these methods, an LDPC decoder supporting the G.hn applications is implemented using a SMIC 130nm CMOS process. The decoder consumes 150 Kbits memory while achieving 1.54 Gbps throughput.