正交频分复用系统中基于迭代插值的低压电力线信道估计  

Channel Estimation Based on Iterative Interpolation for Low-voltage Power Line in Orthogonal Frequency Division Multiplexing System

作　　者：唐良瑞[1] 张勤[1] 张平[1] 

机构地区：[1]华北电力大学电气与电子工程学院,北京市昌平区102206

出　　处：《中国电机工程学报》2010年第1期98-102,共5页Proceedings of the CSEE

基　　金：国家自然科学基金项目(60402004);教育部科学技术研究重点项目~~

摘　　要：正交频分复用(orthogonal frequency division multiplexing,OFDM)技术以其多种优势成为低压电力线通信的最佳选择,信道估计是OFDM系统的关键问题之一。分析低压电力线信道特性,针对信道慢时变特性及噪声复杂的特点,提出一种适用于低压电力线通信的采用迭代插值的信道估计算法。该算法对导频符号的频率响应进行迭代插值,求出整个信道的频率响应,并利用信道响应的自相关矩阵,对信道频率响应进行优化,从而得到更加精确的信道估计。仿真结果表明,该信道估计算法能有效地跟踪低压电力线信道特性,降低了系统的误比特率和均方误差。Orthogonal frequency division multiplexing （OFDM） technique has become the best choice for low-voltage power line communication because of its many advantages. Channel estimation is one of the key problems in OFDM system. The low-voltage power line channel properties were analyzed. An iterative interpolation channel estimation algorithm was proposed in allusion to the slow-variant and complex noise of channel. In this algorithm, the rough estimation of the frequency response of the next receiving symbol is acquired by iterative interpolation with the frequency response of the pilots symbols and symbols already estimated. Based on the rough estimation, the frequency response is optimized to accomplish the fine estimate. The simulation results show that the algorithm can track the low-voltage power line channel properties effectively, reduce the bit error rate and mean square error.

关 键 词：正交频分复用 低压电力线 信道估计 迭代插值 修正 

分 类 号：TM73[电气工程—电力系统及自动化]