OFDM信道估计中基于随机导频的OMP算法研究

信道估计是正交频分复用（OFDM）系统中非常重要的一个环节,准确的信道状态信息是数据可靠接收的重要保证.文中具体采用基于随机导频的正交匹配追踪算法（OMP）对OFDM系统进行信道估计,通过与最小二乘（LS）算法性能对比,验证了OMP算法可以使用更少的导频获得较好的估计性能.并仿真分析了OMP算法对先验信道稀疏度的依赖程度,为实际应用提供了一定参考意义.

Research on OMP algorithm based on random pilot in OFDM channel estimation

Channel estimation is a very important link in the orthogonal frequency division multiplexing （OFDM） system, the accurate channel state information is the important guarantee of receive data reliably. This paper uses orthogonal matching pursuit algorithm （OMP） based on random pilots to estimation channel for OFDM system, by compared with least squares （LS） algorithm performance, verifies the OMP algorithm has better performance but with less pilots. And analysis of the OMP algorithm dependent on the priori sparse degree of channel by simulation, it provides the certain reference significance for the practical applications.