Open AccessEnergy‐efficient LDPC codec design using cost‐effective early termination scheme
Author(s) -
Lin ChengHung,
Wu YuanSyun,
Song ChenPei
Publication year - 2019
Publication title -
iet computers and digital techniques
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.219
H-Index - 46
ISSN - 1751-861X
DOI - 10.1049/iet-cdt.2018.5074
Subject(s) - codec , low density parity check code , decoding methods , computer science , throughput , overhead (engineering) , efficient energy use , chip , cmos , computer hardware , parallel computing , electronic engineering , algorithm , engineering , electrical engineering , telecommunications , wireless , operating system
Here, the authors propose an energy‐efficient codec design using a rate‐0.91 systematic quasi‐cyclic‐low‐density parity‐check (QC‐LDPC) code. A cost‐effective early termination (ET) scheme is presented for efficiently terminating the decoding iterations and maintaining desirable correcting performance. Compared with no ET scheme, the cost‐effective ET scheme achieves 54.6% energy reduction with 1.7% area overhead. Finally, the proposed QC‐LDPC codec employing the cost‐effective ET scheme is implemented in a prototyping chip of 9.86 mm 2 core area using the TSMC 90 nm CMOS technology. Compared with the other decoder chips, the prototyping codec operating at 278 MHz achieves the best decoding energy efficiency of 156 pJ/bit with a high decoding throughput of 4.3 Gbps. The prototyping codec also achieves a high encoding throughput of 4.4 Gbps.