A High-Throughput Low-Power Soft Bit-Flipping LDPC Decoder in 28 nm FD-SOI

We present a low-density parity check (LDPC) decoder using the adaptive degeneration (AD) algorithm with a (3600, 3000) LDPC code, integrated in 1.85 mm2 in 28 nm FD-SOI. With early termination and variable latency decoding, this decoder achieves an optimal energy efficiency of 0.16 pJ/bit and information throughput of 13.6 Gbps with a core supply voltage of 0.4 V. At a core supply voltage of 1.0 V, it achieves 0.58 pJ/bit energy efficiency and 181 Gbps throughput. With constant latency equal to the maximum number of iterations, it achieves optimal energy efficiency of 0.52 pJ/bit and information throughput of 7.2 Gbps at a supply voltage of 0.55 V, and 1.9 pJ/bit energy and 24 Gbps throughput at 1.0 V. The net coding gain at a bit error rate of 10−12 is 8.7 dB.