上行信道估计在TD-LTE系统中的研究

摘要

LTE作为一个很有前景的通信标准,与现有通信标准相比,具有更高的传输速率和更好的传输质量,而上行信道估计是LTE系统中不可缺少的一个环节.在对现有LTE系统的两种信道检测算法分析的基础上,提出了一种兼具高准确度和低复杂度的改进算法,在使用原有算法对导频符号进行信道估计之前,先对其进行时域降噪处理,在插值后能够提高系统的估计准确性.仿真结果表明,改进后的算法与原算法相比,在不增加计算复杂度的前提下,能够较大程度地提高系统的估计性能,更适合第4代移动通信的要求.%As a promising communication standard, LTE has higher data rate and transmission quality compared with current communication standard, in which uplink channel estimation plays an important role in the LTE system. Based on analyzing the LS and MMSE algorithms of the LTE system, an improved algorithm with high accuracy and low complexity is proposed. The pilot signal was processed before the channel estimation by reducing noise in time domain. The simulation results demonstrate that the improved algorithm is a preferable choice in estimation performance without increasing the algorithm complexity.