基于连续支持检测的毫米波信道估计方案

Millimeter-wave channel estimation scheme based on successive support detection

传统信道估计大多数方案都是为窄带系统设计的,为此,提出一种连续支持检测(successive support detection)的宽带波束空间信道估计改进方案。证明空间信道的每个路径分量具有独特的稀疏结构;根据经典的连续干扰消除的思想,连续估计稀疏路径分量;对于每个路径分量,通过稀疏结构联合估计其在不同频率下的信道估计,去除其影响来估计剩余的路径分量。仿真结果表明,与传统的LS和OMP信道估计方法相比,所提方案在未知的路径数的情况下依旧减少了导频开销,提高了信道估计精度,可以以较低的复杂度准确估计信道。

In view of the fact that most of the traditional channel estimation schemes are designed for narrowband systems,an improved wideband beam channel estimation scheme for successive support detection(SSD)was proposed.It was proved that each path component of the channel exhibited a unique sparse structure.According to the idea of classical continuous interference cancellation,sparse path components were continuously estimated.For each path component,its channel estimates at different frequencies were jointly estimated by sparse structure and its effects were removed to estimate the remaining path components.Simulation results show that compared with the traditional LS and OMP channel estimation methods,the proposed scheme reduces pilot overhead and improves channel estimation accuracy in the case of unknown number of paths.Moreover,the channel can be accurately estimated with lower complexity.