Title :
Synchronization and Channel Estimation in Cyclic Postfix based OFDM System
Author :
Kim, Jongkyung ; Lee, SangJin ; Seo, Jongsoo
Author_Institution :
Dept. of Electr. & Electron. Eng., Yonsei Univ., Seoul
Abstract :
We propose a new cyclic postfix based orthogonal frequency division multiplexing (OFDM) system. The proposed system shows a superior performance in a symbol time synchronization while achieving a comparable channel estimation performance as compared to a conventional cyclic prefix based OFDM system. In the proposed system, an identical postfix is generated at the end of each OFDM symbol by inserting pilot values amongst the data symbols in a frequency domain and performing inverse fast Fourier transform (IFFT) operation on it. Robust time synchronization is achieved by auto-and cross-correlating the postfix. Also, time or frequency domain channel estimation can be realized by using properly designed postfix according to channel estimation method
Keywords :
OFDM modulation; channel estimation; fast Fourier transforms; synchronisation; time-frequency analysis; IFFT; OFDM system; auto-correlation; cross-correlation; cyclic postfix; frequency domain channel estimation; inverse fast Fourier transform; orthogonal frequency division multiplexing; symbol time synchronization; time domain channel estimation; Channel estimation; Digital video broadcasting; Fast Fourier transforms; Frequency domain analysis; Frequency synchronization; Local area networks; OFDM; Robustness; Time domain analysis; Wireless LAN;
Conference_Titel :
Vehicular Technology Conference, 2006. VTC 2006-Spring. IEEE 63rd
Conference_Location :
Melbourne, Vic.
Print_ISBN :
0-7803-9391-0
Electronic_ISBN :
1550-2252
DOI :
10.1109/VETECS.2006.1683202
