一种改进的电力线正交频分复用信道估计的最小平方算法  

AN IMPROVED LEAST SQUARE ALGORITHM FOR CHANNEL ESTIMATION OF POWER LINE ORTHOGONAL FREQUENCY DIVISION MULTIPLEXING COMMUNICATIONS

作　　者：赵宇明[1] 郭静波[1] 王赞基[1] 

机构地区：[1]清华大学电机系,北京市海淀区100084

出　　处：《电网技术》2005年第8期25-29,共5页Power System Technology

基　　金：国家自然科学基金资助项目(50177016)~~

摘　　要：信道估计是正交频分复用(Orthogonal Frequency Division Multiplexing,OFDM)技术数据解调与均衡的基础,文章在分析电力线信道特性的基础上,分析了采用离散导频技术的信道估计算法的性能,针对其抗噪声干扰能力弱的特点,提出了通过截短时域冲击响应长度来提高估计精度的算法。在电力线信道环境下的仿真计算证明了该算法具有良好的估计性能。Channel estimation is the basis of data demodulation and equalization in Orthogonal Frequency Division Multiplexing (OFDM) technology. On the basis of analyzing the characteristics of power line channel, the performance of estimation algorithm, is researched when dispersed pilot frequency technology is used. Because the anti-noise interference capability of this algorithm is weak, an improved algorithm to raise the estimation accuracy by truncating the length of impulse response in time domain is proposed. In the environment of power line channel it is proved that the proposed algorithm possesses good estimation performance.

关 键 词：电力线载波通信系统 电力线信道特性 正交频分复用 信道估计 最小平方算法 

分 类 号：TN913.6[电子电信—通信与信息系统] TN911.23[电子电信—信息与通信工程]