文档介绍：
Improved DFT-based Channel Estimation for LTE Uplink
Zhou Liying, Wang Weidong**
5
10
15
(School of Electronic Engineering, Beijng University of Posts and munications, Beijing
100876)
Abstract: Discrete Fourier transform (DFT) based channel estimation (CE) has been widely studied for
its balance between performance plexity. Considering the practical situation, there are two
main problems. One is insufficient noise suppression due to unknown channel statistic and the other is
channel energy leakage caused by limited band allocation and virtual subcarriers. As a result, the
conventional DFT-based CE suffers performance degradation. In this paper, an improved DFT-based
CE method is addressed for Long-Term Evolution (LTE) uplink bat these two problems with
plexity and no need for prior knowledge. A decimation of channel impulse response (CIR)
based on tap-tuned threshold and symmetrical extension signal processing is proposed for efficient
noise elimination with less channel energy loss. Simulation results manifest that the proposed method
can improve normalized mean square error (MSE) performance of the CE module through different
comparisons. Besides, the accuracy of noise variance estimation is also increased.
Key words: munication; LTE; channel estimation; channel impulse response;
threshold-based selection; energy leakage
20
0 Introduction
Orthogonal