Improving HomePlug Power Line Communications with LDPC Coded OFDM

INTELEC 06 - Twenty-Eighth International Telecommunications Energy Conference Pub Date : 2006-12-04 DOI:10.1109/INTLEC.2006.251659

C. Hsu, Neng Wang, W. Chan, P. Jain

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引用次数: 7

Abstract

Power line communications (PLC) has received much attention due to the wide connectivity and availability of power lines. Effective PLC must overcome the harsh and noisy environments inherent in PLC channels. HomePlug 1.0 is the current PLC standard in North America. The physical layer of HomePlug 1.0 employs orthogonal frequency division multiplexing (OFDM) as well as concatenated Reed-Solomon and convolutional coding. Aiming to obtain higher PLC throughput, we investigate the performance of OFDM with low-density parity-check (LDPC) codes and compare the proposed scheme with HomePlug 1.0 ROBO mode. In our simulations, the PLC channel is modeled by multipath fading, with Middleton's Class A noise (AWCN) model simulating the worst-case impulsive noise. We apply clipping to lessen the impact of impulsive noise. A simple but effective method is devised to estimate the variance of the clipped noise for LDPC decoding. In comparison with ROBO mode, the proposed scheme offers improved performance and lower computational complexity per decoded bit. Our scheme provides increased throughput by dispensing with ROBO mode's repetitive transmission of information to gain time diversity

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用LDPC编码OFDM改进HomePlug电力线通信

由于电力线的广泛连接和可用性，电力线通信(PLC)受到了广泛的关注。有效的PLC必须克服PLC信道固有的恶劣和噪声环境。HomePlug 1.0是目前北美的PLC标准。HomePlug 1.0的物理层采用正交频分复用(OFDM)以及串联里德-所罗门编码和卷积编码。为了获得更高的PLC吞吐量，我们研究了具有低密度奇偶校验(LDPC)码的OFDM的性能，并将该方案与HomePlug 1.0 ROBO模式进行了比较。在我们的仿真中，PLC信道采用多径衰落建模，米德尔顿的A类噪声(AWCN)模型模拟最坏情况下的脉冲噪声。我们采用了削波来减少脉冲噪声的影响。提出了一种简单有效的LDPC译码噪声裁剪方差估计方法。与ROBO模式相比，该方案具有更高的性能和更低的每解码比特的计算复杂度。我们的方案通过取消ROBO模式的重复信息传输来获得时间分集，从而提高了吞吐量

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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INTELEC 06 - Twenty-Eighth International Telecommunications Energy Conference

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