Low power decoder design for QC-LDPC codes

This paper presents a low-power decoder design approach for generic quasi-cyclic low-density parity-check (QC-LDPC) codes based on the layered min-sum decoding algorithm. To reduce the energy consumption, a novel message length-shortening scheme is explored. The check node processing unit (CNU) is accordingly optimized using bit-serial architecture. This low cost design scheme can greatly lower the power consumption while maintaining the necessary throughput required by mobile applications. We further demonstrate the benefits of the proposed techniques by applying the new architecture to the QC-LDPC code in CMMB standard.