电力线正交频分复用通信的实时信道估计

信道估计是电力线正交频分复用（OFDM）通信中的重要环节。直接影响OFDM通信的均衡效果和动态数据流分配。文中介绍了利用电力线信道的性质，在OFDM通信中实时获得信道传输特性函数的方法，并通过实验证实了该方法的有效性。估计方法得到的电力线信道传输特性曲线与实际曲线的比较以圈表的形式给出。实验还证实电力线信道可以看成一个线性有限冲激响应（FIR）滤波器系统，为进一步研究电力线信道的性质和高速电力线通信奠定了基础。

REAL-TIME CHANNEL ESTIMATION OF POWER LINE OFDM COMMUNICATIONS

Channel estimation is an important part of power line orthogonal frequency division multiplexing (OFDM) and influences the balanced effects and dynamic data flow distribution of OFDM communications directly. How to get the real time channel frequency response in power line OFDM communications by use of the characteristics of power line channel is discussed. The method has been evaluated by an experiment and proved efficient and effective. The result of the experiment is given by showing the comparison figure of estimated channel frequency responses and the true channel responses. It is also proved that the power line channel can be treated as a FIR model. That can be a model base for the future research about power line channel and power line communications. This project is supported by the National Natural Science Foundation of China (No. 50177016).