摘要 : This letter proposes a flexible coding approach (FLCA) for quasi-cyclic low-density parity-check (QC-LDPC) codes based on the base graphs and lifting factors in 5G new radio (NR). The FLCA can achieve almost all code rates and blo... 展开 This letter proposes a flexible coding approach (FLCA) for quasi-cyclic low-density parity-check (QC-LDPC) codes based on the base graphs and lifting factors in 5G new radio (NR). The FLCA can achieve almost all code rates and blocklengths supported by 5G physical layer using a novel shortening method which is different from those used in 5G NR. In the proposed FLCA, the shortening patterns are optimized according to the code rates and modulation schemes, including quadrature phase shift keying, 16-ary and 64-ary quadrature amplitude modulations. Our proposed method is fully applicable to the existing LDPC codes of 5G and makes the encoding more flexible. Both the numerical thresholds of PEXIT analysis and the simulation results demonstrate that the proposed coding approach can bring noticeable performance gain over the current LDPC codes used in 5G NR. 收起