Design of a New Bit Interleaving Scheme for the TB-SC PLDPC-coded DCO-OFDM Systems
Based on the TB-SC PLDPC-coded DCO-OFDM systems,we first propose a new carrier matching mapping scheme based on the unequal protection characteristics of subcarriers to improve the system performance.Then,according to the improved PEXIT,the decoding thresholds of TB-SC P-LDPC code under three different interleaving schemes are analyzed.The theoretical analysis shows that,under the 16-QAM and 64-QAM modulations,the proposed new carrier matched mapping schemes can make TB-SC PLDPC code converge at 15.52 dB and 19.24 dB,respectively,while the variable node matched mapping and continuous mapping schemes require a larger signal-to-noise ratio.The simulation results also show that the performance of the proposed new carrier matched mapping scheme is better than that of their counterparts.
spatially coupled protograph LDPC codedirect current optical orthogonal frequency division multiplexbit interleavingextrinsic information transfer algorithm
万方数据
维普
