Abstract: Broadband communications for Low Voltage Power Line（LV-BPL） Internet access system with impulsive noise using digital fountain concatenated Coding Orthogonal Wavelet Packet Modulation（OWPM） is considered in this paper.In very low SNR，OWPM operates improved performance to OFDM for the stable orthogonal wavelet bases.And concatenated inner Block Code Modulation（BCM） can help the OWPM system to tackle impulsive noise burst.In this paper we employ digital fountain codes as outer code，which are a new class of erasure detecting codes considered the state-of-the-art discovery in coding theory due to their simplicity and performance.

Key words: wavelet-packet modulation, LV-BPL, digital fountain code, Block Code Modulation（BCM）, broadband access

摘要： 宽带低压电力线（LV-BPL）通信是一种重要的Internet接入技术，基于数字喷泉码与正交小波包编码调制提出了一种新的LV-BPL物理层系统模型。系统采用数字喷泉码作外码，块编码作内码，按块编码调制（BCM）映射到正交小波包调制时频平面。由于小波包稳定的正交性、自由的时频铺砌，数字喷泉码与码率无关的性质及BCM抗脉冲干扰的特点，系统在LV-BPL信道具有比编码DFT-OFDM更好的性能。

关键词: 小波包调制, LV-BPL, 数字喷泉码, 块编码调制, 宽带接入