基于分块导频的SC-FDE信道估计改进算法

研究提高通信性能问题,在SC-FDE宽带无线系统中,多径效应存在制约系统传输带宽提高的符号间干扰问题。目前采用的分块传输,是将数据分块和导频分块,前者导频利用率不高,而后者信道估计不够精确。为了提高系统频带利用率和信道估计精确度,在数据分块和导频分块基础上,本文提出了一种改进的数据帧结构,即对数据块和导频可同时划分多个块,并将位置相近的分块导频进行重复利用,可进行多次信道估计。结果表明,与单一的导频分块或者数据分块方法相比,系统性能提高了约1dB。仿真证明,改进方法对SC-FDE中的信道通信性能的提高具有参考价值。

Improved Channel Estimation Algorithm for SC-FDE Based on Block Pilot

In SC-FDE broadband wireless systems,multipath effect constrains the increase of transmission bandwidth,while block transmission is effective against multipath interference.There are two block transmission algorithms,one is data block method which has a lower rate of pilot utilization,and the other is pilot block method which is not precise enough.In order to improve the system bandwidth efficiency and channel estimation accuracy,an improved data frame structure was proposed,which divided data block and pilot into multiple subblocks simultaneously,and adjacent pilots were used for channel estimation repeatedly.The simulation results show that the enhanced algorithm can improve system performance by 1dB,compared with data block or pilot block processing.The result is meaningful for methods of channel estimation in SC-FDE systems.