Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Research Article Intelligent Modified Channel and Frequency Offset Estimation Schemes in Future Generation OFDM-Based Packet Communication Systems | Hindawi Publishing Corporation EURASIP Journal on Wireless Communications and Networking Volume 2008 Article ID 735732 11 pages doi 2008 735732 Research Article Intelligent Modified Channel and Frequency Offset Estimation Schemes in Future Generation OFDM-Based Packet Communication Systems Jaemin Kwak 1 Sungeon Cho 2 Kitaeg Lim 3 Pusik Park 3 Daekyo Shin 3 and Jongchan Choi3 1 Division of Marine Electronics and Communication Engineering Mokpo National Maritime University 571 Jukgyo-dong Mokpo-si Jeollanam-do 530-729 South Korea 2 Division of Computer Communications Engineering Sunchon National University 315 Maegok-dong Sunchon-si Jeollanam-do 540-742 South Korea 3 SoC Research Center Korea Electronics Technology Institute 68 Yatap-dong Bundang-gu Seongnam-si Gyeonggi-do 463-816 South Korea Correspondence should be addressed to Jaemin Kwak kjm@ Received 30 January 2008 Accepted 5 June 2008 Recommended by Jong Hyuk Park The channel estimation and frequency offset estimation scheme for future generation orthogonal frequency division multiplexing OFDM- based intelligent packet communication systems are proposed. In the channel estimation scheme we use additional 8 short training symbols besides 2 long training symbols for intelligently improving estimation performance. In the proposed frequency offset estimation scheme we allocate intelligently different powers to the short and long training symbols while maintaining average power of overall preamble sequence. The preamble structure considered is based on the preamble specified in standardization group of for wireless local area network WLAN and for intelligent transportation systems ITSs . From the simulation results it is shown that the proposed intelligent estimation schemes can achieve better mean squared error MSE performance for channel and frequency offset estimation error than the conventional scheme. The proposed schemes can be used in designing for enhancing the .
