摘要
正交频分复用OFDM作为一种可有效对抗码间干扰,频谱利用率高的高速传输系统,在水声高速通信中有着重要的发展前景.文中在用块状导频实现OFDM信道估计的原理基础之上,结合水声通信及信道传播特点,研究了LS(最小平方误差),MMSE(最小均方误差)和LMMSE(线性最小均方误差)算法在水声OFDM系统中的信道估计原理.建立信道模型,通过仿真实验,比较分析了3种算法在信道估计中的性能差异,为实际系统设计提供理论参考.
Orthogonal frequency division multiplexing（OFDM）is a method that can combat multipath interference,fully uses the frequency band,and has a promising future in UWA communication.In this paper,we study,by combination of the basic algorithm principle for OFDM channel estimation based on block pilot with underwater acoustic communication and characteristics of channel transport,the channel estimation algorithms in OFDM underwater acoustic communication systems,including algorithms of LS（least-square）,MMSE（minimum mean square error） and LMMSE（linear minimum mean square error）.A channel model is built and the different performances among these algorithms are analyzed by simulation,so as to provide theoretical guidelines for designing actual systems.
出处
《江苏科技大学学报（自然科学版）》
CAS
2012年第2期185-189,共5页
Journal of Jiangsu University of Science and Technology:Natural Science Edition
关键词
OFDM
信道估计
LS
MMSE
LMMSE
orthogonal frequency division multiplexing
channel estimation
least square
minimum mean square error
linear minimum mean square error
