An (8158,7136) low-density parity-check encoder

Low-density parity-check codes achieve coding performance which approaches the Shannon limit. Based on a novel method for deriving regular quasi-cyclic sub-codes, a radiation tolerant encoder was implemented in 0.25μm CMOS. Use of generator polynomial reconstruction, partial product multiplication and functional sharing in the parity register results in a highly efficient design. Only 1,492 flip flops along with a programmable 21-bit look-ahead scheme are used to achieve a 1 Gb/s data throughput. A comparable two-stage encoder requires 8,176 flip flops.