卫星多径信道下SOFDM插值估计算法的对比分析  

A Comparative Analysis on Interpolation Estimation Algorithms for SOFDM Signals via Satellite Multipath Channels

作　　者：杨童[1] 李集林[1] 

机构地区：[1]中国空间技术研究院卫星应用系统部,北京100086

出　　处：《航天器工程》2010年第2期67-73,共7页Spacecraft Engineering

摘　　要：在卫星多径衰落信道环境中传输正交频分复用信号时,工程上可以考虑采用以插值运算为核心的信道估计方法对接收信号进行信道估计。文章首先给出并研究了线性插值、三次样条插值和拉格朗日函数插值这三种插值估计算法的基本原理,然后对各种算法的计算复杂度、插值估计的均方误差以及系统的误比特率这三项性能指标进行了对比分析,最后通过综合评估总结出了"在慢多径衰落信道环境下宜采用线性插值估计算法"和"在快多径衰落信道环境下宜采用三次样条插值估计算法或拉格朗日函数插值估计算法"的结论。This paper aims at a comparative analysis on the applicability of three interpolation estimation algorithms for SOFDM signals that are transmitted via satellite mobile multipath fading channels.First,fundamental theories of the Linear,the Cubic Spline,and the Lagrange interpolations are proposed and introduced.Next,the Computational Complexity,MSE of channel estimation and BER performance of these methods are comparatively analyzed and discussed,and a comprehensive evaluation report on their applicability is given.It shows that the Linear scheme is more suitable for the Slow-Fade channel while the Fast-Fade channel prefers to the Cubic Spline and Lagrange scheme.

关 键 词：卫星 信道估计 插值估计 线性插值 三次样条插值 拉格朗日函数插值 

分 类 号：V443[航空宇航科学与技术—飞行器设计]