滤波器组多载波系统中时域估计方法未充分利用导频信息且频谱效率不高的问题，对原有的估计表达式进行了扩展并对导频非稀疏和稀疏两种情况进行了研究。(Problems existing in traditional time domain channel estimation method of FBMC systems were analyzed in
this paper and a new equation was also presented. Methods were respectively investigated under full preamble and
sparse preamble conditions)