Synchronization and Channel Estimation in Cyclic Postfix Based OFDM System

Jongkyung KIM  Sangjin LEE  Jongsoo SEO  

Publication
IEICE TRANSACTIONS on Communications   Vol.E90-B   No.3   pp.485-490
Publication Date: 2007/03/01
Online ISSN: 1745-1345
DOI: 10.1093/ietcom/e90-b.3.485
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Transmission Systems and Transmission Equipment for Communications
Keyword: 
synchronization,  channel estimation,  OFDM,  

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Summary: 
We propose a new cyclic postfix based orthogonal frequency division multiplexing (OFDM) system. The proposed system shows superior performance in symbol time synchronization while achieving channel estimation performance comparable to that of 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.