【摘要】 用A类噪声模型模拟电力线信道中的脉冲噪声环境,采用LDPC码来抑制A类噪声信道(AWAN)中的窄带脉冲噪声。针对A类噪声信道的特性,将信道初始信息的对数似然比(LLR)公式进行适当修改,完成对原有Log-BP译码算法的改造。通过蒙特卡罗仿真与原有的Log-BP译码算法的译码性能进行比较分析,结果表明,在对A类噪声模型的参数Γ和A取值合理的情况下,在AWAN信道上改造后的Log-BP译码算法的误码率性能提高近11dB。更多还原

【Abstract】 LDPC(low density parity check)codes to AWAN(additive white class a noise)channels is adopted, which is usually used as the model of impulsive noise environment of power line channels. A modification for the LLR (likelihood ratio) of the initial information to Log-BP(log domain belief propagation)decoding,which is suitable for AWAN channels,is proposed.Finally,compared with the original Log-BP decoding,it shows the BER(bit error rate) performance of the modified Log-BP decoding over AWAN channels by Monte-Carlo simulation,the result shows that the modified Log-BP decoding has about 11 dB gain with the reasonable values A and Γ.更多还原