In G.hn standard, quasi-cyclic low density parity check ( QC-LDPC) is used as the channel encoding in power line communica-tion.In the paper, we study the performance of QC-LDPC codes in noise environment of power lines.Due to the G.hn standard does not provide a power line noise model, we apply the distribution of characteristic parameters of impulse noise in power line to noise modelling, and simulate the performance curve of QC-LDPC codes in environment of the modelled noise and the measured noise.By comparing the performance curves of QC-LDPC codes in two cases, it has verified the reasonability of the constructed noise model of power lines.Simulation results indicate that the combinations of the code length and code rate should be 960&1/2, or 4320&1/2, or 4320 2/3 to meet the targeted bit error rate of 10-6 in the case of 256QAM modulation.%在G．hn标准中，电力线通信（PLC）使用准循环低密度奇偶校验码（QC-LDPC）作为信道编码。研究QC-LDPC码在电力线噪声环境中的性能。针对G．hn标准没有提供电力线噪声模型这一问题，把电力线脉冲噪声特征参数分布应用到噪声建模，在噪声模型和实测噪声环境中仿真QC-LDPC码性能曲线。通过比较两种情况下QC-LDPC码性能曲线，验证了构建的电力线噪声模型的合理性。仿真结果表明在256 QAM调制下为满足误码率为10－6应选用的码长码率的组合：960＆1/2，4320＆1/2，4320＆2/3。
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