PERFORMANCE ANALYSIS OF CHANNEL ESTIMATION FOR LDPC-CODED OFDM SYSTEM IN MULTIPATH FADING CHANNEL

查看全文 作　　者：Zhu Qi Li Hao Feng [1]Guangzeng 机构地区：[1]Dept of Commun. Eng., Nanjing Univ. of Posts and Telecommun., Nanjing 210003, China 出　　处：《Journal of Electronics(China)》索引2006年第23卷第6期,共5页 基　　金：Supported by Jiangsu University Natural Science Re-search Fund (05KJB510090), National Natural Science Foundation of China (No.60472104). 摘　　要：In this paper, the channel estimation techniques for Orthogonal Frequency Division Multiplexing (OFDM) systems based on pilot arrangement are studied and we apply Low Density Parity Check (LDPC) codes to the system of IEEE 802.16a with OFDM modulation. First investigated is the influence of channel es-timation schemes on LDPC-code based OFDM system in static and multipath fading channels. According to the different propagation environments in 802.16a system, a dynamic channel estimation scheme is proposed. A good irregular LDPC code is designed with code rate of 1/2 and code length of 1200. Simulation results show that the performance of LDPC coded OFDM system proposed in this paper is better than that of the convolution Turbo coded OFDM system proposed in IEEE standard 802.16a. 关 键 词：正交频率分割多路技术 低密度奇偶性检验 LDPC 信道估计 多路衰落信道