FBMC时域信道估计技术

Time domain channel estimation technology for FBMC

针对滤波器组多载波(FBMC)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2种情况进行了研究。在导频全部不为零的情况下给出一组优化导频,在导频呈稀疏结构时探究了不同形状的辅助点对估计性能的影响。在此基础上利用相邻符号子载波上噪声的相关性提出了一种联合估计算法。理论分析与仿真结果表明,扩展以后的算法在同样导频开销的条件下效果优于原有算法,多符号联合估计则可以进一步减小估计的克拉美罗界。

Aiming at the problems existing in filter bank multicarrier(FBMC)system that the time domain estimation method fails to sufficiently utilize pilot frequency information and the spectrum effectiveness is not high,the original estimation expression was extended and two cases including non-sparse pilot frequency and sparse pilot frequency were investigated.In the case that all pilot frequencies are not zero,a group of optimized pilot frequencies were given.The influence of different shapes of auxiliary points on estimated performance were explored when the pilot frequency was sparse.In addition,a joint estimation method was proposed by utilizing the correlation among the noises in the neighboring symbol subcarriers.Both theoretic analysis and simulation results show that,at the same pilot overhead,the extended algorithm is superior to the original algorithm and the combined multi-symbol estimation can further reduce the estimated Cramer-Rao bound.