A COMPARISON OF TWO 2D CHANNEL ESTIMATORS FOR OFDM SYSTEM  

作　　者：Shu Feng Cheng Shixin Chen Ming 

机构地区：[1]Department of Communication Engineering, School of Electronic Engineering and Optoelectronic Techniques, Nanjing University of Science and Technology, Nanjing 210094, China [2]National Key Lab of Mobile Communication, Radio Engineering Department, Southeast University, Nanjing 210096, China

出　　处：《Journal of Electronics(China)》2006年第6期814-819,共6页电子科学学刊（英文版）

基　　金：Supported by the National Natural Science Foundation of China (No: 60496311).

摘　　要：The paper deals with two-dimensional （2D） channel estimation of Orthogonal Frequency Division Multiplexing （OFDM） system ill slow fading wireless channel. We concentrate on two channel estimation schemes： Least Square （LS）＋Weighted BiLinear （WBL） and LS＋Linear Minimum Mean-Squared Error （LMMSE） where the first method is proposed in this paper. After theory analysis and simulation in Typical Urban （TU） channel, we find that LS＋LMMSE achieves the optimal perform- anee by exploiting prior knowledge of channel whereas LS＋WBL, without requiring channel knowl- edge and with only half of the computational amount of LS＋LMMSE, approaches LS＋LMMSE in Bit Error Ratio （BER） performance when the distance of two adjoining pilot symbols along frequency direction is sufficiently small. This makes LS＋WBL very suitable for wideband wireless applications.The paper deals with two-dimensional (2D) channel estimation of Orthogonal Frequency Division Multiplexing (OFDM) system in slow fading wireless channel. We concentrate on two channel estimation schemes: Least Square (LS)+Weighted BiLinear (WBL) and LS+Linear Minimum Mean-Squared Error (LMMSE) where the first method is proposed in this paper. After theory analysis and simulation in Typical Urban (TU) channel, we find that LS+LMMSE achieves the optimal perform-ance by exploiting prior knowledge of channel whereas LS+WBL, without requiring channel knowl-edge and with only half of the computational amount of LS+LMMSE, approaches LS+LMMSE in Bit Error Ratio (BER) performance when the distance of two adjoining pilot symbols along frequency di-rection is sufficiently small. This makes LS+WBL very suitable for wideband wireless applications.

关 键 词：Orthogonal Frequency Division Multiplexing （OFDM） Linear Minimum Mean-SquaredError （LMMSE） Weighted BiLinear （WBL） Channel cstimation Computational amount 

分 类 号：TN911[电子电信—通信与信息系统]