Design and Test of a 175-Mb/s, Rate-1/2 (128,3,6) Low-Density Parity-Check Convolutional Code Encoder and Decoder

Abstract

Low-density parity-check block codes (LDPC-BCs) are quickly becoming the forward error correcting code of choice for emerging communication standards. However, low-density parity-check convolutional codes (LDPC-CCs), the convolutional counterpart of LDPC-BCs, seem to be better suited in applications with streaming data or variable sized packets. A rate-1/2, (128,3,6) LDPC-CC ASIC has been implemented in 180-nm, 1.8-V CMOS technology. We present the VLSI architecture of a register-based LDPC-CC encoder and decoder that includes an on-chip, pseudo-random additive white Gaussian noise channel emulator. The decoder comprises a pipeline of ten identical processing units and attains up to 175 Mb/s of decoded throughput.