Lowering the error-rate floors of moderate-length high-rate irregular ldpc codes

This paper presents a specialized class of irregular low-density parity-check (LDPC) codes of moderate length (lo3 5 n 5 lo4) and high rate (R 2 3/4). Codes in this class admit low-complexity encoding and have lower error rate floors than other irregular LDPC code design approaches. It is also shown that this class of LDPC codes is equivalent to a class of systematic serial turbo codes. Code designs of moderate-length, high rate codes which yield bit error rate floors below lo-' are presented.