Adaptive Modulation with Channel Estimation in High-Speed Packet-Based OFDM Communication Systems  

作　　者：HOU Xiao-lin WU Jun-li YIN Chang-chuan YUE Guang-xin 

机构地区：[1]School of Telecommunication Engineering, Beijing University of Posts and Telecommunications, Beijing 100876, P.R.China School of Telecommunication Engineering, Beijing University of Posts and Telecommunications, Beijing 100876, P.R.China School of Telecommunication Engineering, Beijing University of Posts and Telecommunications, Beijing 100876, P.R.China School of Telecommunication Engineering, Beijing University of Posts and Telecommunications, Beijing 100876, P.R.China

出　　处：《The Journal of China Universities of Posts and Telecommunications》2004年第z1期76-82,共7页中国邮电高校学报（英文版）

基　　金：NationalNaturalScienceFundsNo.90 1 0 4 0 1 8and 60 1 72 0 52andNational863Hi techResearchandDevlopmentPro jectNo.2 0 0 1AA1 2 30 1 6

摘　　要：In this paper, adaptive modulation with channel estimation in high-speed packet-based Orthogonal Frequency Division Multiplexing (OFDM) communication systems for beyond 3G are discussed. Different adaptive modulation and channel estimation methods are presented and compared, then those methods suitable for our intended application are chosen. Conclusions can be drawn from computer simulations that with proper selection of packet length and subband width, wide subband adaptive modulation with Least Square plus Discrete-time Fourier Transform (LS-DFT) channel estimation can give an acceptable performance with low complexity for channel with low Doppler shift and small path delay. Otherwise, narrow subband or subcarrier adaptive modulation together with LS-DFT plus Decision Directed (LS-DFT-DD) must be used.In this paper, adaptive modulation with channel estimation in high-speed packet-based Orthogonal Frequency Division Multiplexing (OFDM) communication systems for beyond 3G are discussed. Different adaptive modulation and channel estimation methods are presented and compared, then those methods suitable for our intended application are chosen. Conclusions can be drawn from computer simulations that with proper selection of packet length and subband width, wide subband adaptive modulation with Least Square plus Discrete-time Fourier Transform (LS-DFT) channel estimation can give an acceptable performance with low complexity for channel with low Doppler shift and small path delay. Otherwise, narrow subband or subcarrier adaptive modulation together with LS-DFT plus Decision Directed (LS-DFT-DD) must be used.

关 键 词：OFDM adaptive modulation channel estimation beyond 3G 

分 类 号：TN929.5[电子电信—通信与信息系统]