Robust Channel Estimation against Band Edge Effect in LTE Advanced Systems

• Main Authors: Chi-Fong Li, 李其峰
• Other Authors: 張進福
• Format: Others
• Language: zh-TW
• Published: 2012
• Online Access: http://ndltd.ncl.edu.tw/handle/49986289712442549818

碩士 === 國立臺灣大學 === 電信工程學研究所 === 100 === Channel estimation is critical to receiver performance in most wireless communication systems. 3GPP Long term Evolution (LTE) represents a major advance in cellular technology. In this paper, we explain how to exploit the reference signals to estimate the channel frequency response in LTE downlink system. We will consider a common problem called edge effect during the process, it will decrease the estimation accuracy on band edge subcarriers. In order to alleviate this phenomenon, we propose a virtual subcarrier estimator to ease the influence. Furthermore, we adopt NLMS (Normalized Least Mean Square) to enhance the improvement of virtual subcarrier estimator. Finally, we discuss the case when MIMO scheme was adopted. In this situation spatial correlation between channels can be exploited to get an extra improvement on estimation accuracy.