用于多用户宽带电力线通信的同步信号的设计与实现  

Design and Implementation of the Synchronization Signal Based for Multi-user Broadband Power Line Communications

作　　者：梁栋[1] 张保会[1] 牛东文[1] 付科源[1] 

机构地区：[1]电力设备电气绝缘国家重点实验室(西安交通大学),陕西省西安市710049

出　　处：《中国电机工程学报》2014年第1期197-205,共9页Proceedings of the CSEE

摘　　要：以正交频分复用(orthogonal frequency division multiplexing,OFDM)调制为基础的宽带电力线通信技术,为智能电网、智能家居以及"最后一公里"提供了高效可靠的信息传输方案,然而OFDM对同步错误极度敏感,针对此问题,采用多相序列作为主同步信号的多用户帧结构,利用一种新的多相序列族(用于用户群搜索)作为主同步信号,序列族的设计不仅要考虑每个序列都有更优良的自相关特性即更高的峰值对旁瓣峰值比,还要求有很好的互相相关特性以对抗其他用户训练序列引起的用户间干扰。多用户系统中不同用户采用不同的序列作为同步序列,这种方法对系统的复杂性没有任何影响。在作者自制的硬件平台上实现了该算法,实验和仿真结果均表明该同步设计更适用于电力线环境。Orthogonal frequency division multiplexing （OFDM） modulation-based broadband power line communication technology provides efficient and reliable information transmission for the smart grid, smart home and the ＂last mile＂. However, OFDM is highly sensitive to the synchronous error, which may reduce its performance. To solve this problem, the polyphase sequence was chosen as the primary synchronization signal multi-user frame structure and a new polyphase sequence family （for user group of search） was used as the main sync signal. In order to combat inter-user interference caused by other users of training sequence, he design of the sequence set not only to take into account each sequence with better autocorrelation properties, that is a higher peak-to-peak sidelobe ratio, also requires a good cross-correlation characteristics. In multi-user systems, different users use different sequences as the synchronization preambles and this does not increase the system complexity. On the authors＇ self-made hardware platform the proposed synchronization solution was realized, and the experiment and simulation results show that the synchronization design is more suitable for power line environment.

关 键 词：宽带电力线通信 实测电力线信道 正交频分复用 多用户同步信号设计 多相序列族 数字信号处理 现场可编程门阵列 

分 类 号：TM73[电气工程—电力系统及自动化]