一种适用于3GPP LTE下行链路的低复杂度信道估计算法

摘要

The channel estimation algorithms have been studied for the downlink of 3 GPP LTE systems. Based on the reference signals of the LTE specifications, a novel channel estimation algorithm is proposed. This algorithm compares the output of the ACM (Adaptive Channel Manager) with a preset threshold. If the output of the ACM is larger than the threshold, the noise restraining filter will be employed to restrain the noises. The simulation results show that, without increasing much computational complexity, the proposed algorithm has better BER performances compared with the LTE channel estimation algorithm%研究了LTE(Long Term Evolution)系统下行链路的信道估计算法.基于LTE通信协议中参考信号的设计,提出了一种新的信道估计算法.该算法引入ACM(Adaptive Channel Manager,自适应控制器)和噪声抑制滤波器,将ACM的输出与预先设定的门限比较,若输出高于此门限则使用噪声抑制滤波器进行滤波.仿真结果表明,此算法相对于LTE信道估计算法在增加很少计算复杂度的情况下,获得了性能改善.