A Modified Early-Late Gate for Blind Symbol Timing Recovery of OFDM Systems

Arafat AL-DWEIK  Reyad EL-KHAZALI  

Publication
IEICE TRANSACTIONS on Communications   Vol.E89-B   No.1   pp.11-18
Publication Date: 2006/01/01
Online ISSN: 1745-1345
DOI: 10.1093/ietcom/e89-b.1.11
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Transmission Systems and Transmission Equipment for Communications
Keyword: 
symbol synchronization,  OFDM,  carrier frequency offset,  

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Summary: 
This paper presents a new blind symbol timing recovery technique for OFDM systems. The proposed technique is based on modifying the conventional early-late loop used for single carrier systems. The new topology exploits the interference introduced by the loss of orthogonality due to symbol timing offsets. The new structure is completely non data-aided and is independent of the OFDM symbol structure. The new technique can extract symbol timing with carrier frequency offset up to 94% of the OFDM spectrum.