A Synchronization and Cell Searching Technique Using Pilot Tones for OFDM Cellular Systems

Dong Han KIM  Kwang Soon KIM  Jae Young AHN  Yong Soo CHO  

IEICE TRANSACTIONS on Communications   Vol.E89-B   No.1   pp.235-238
Publication Date: 2006/01/01
Online ISSN: 1745-1345
DOI: 10.1093/ietcom/e89-b.1.235
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Wireless Communication Technologies
OFDM,  synchronization,  cell searching,  pilot,  downlink detection,  

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In this letter, a pilot structure and an efficient algorithm for downlink synchronization and cell searching in OFDM-based cellular systems are proposed. The pilots, randomly allocated in the frequency domain, allow us to minimize inter-cell interference (ICI) as well as to increase cell searching capability, estimation range of integer carrier frequency offset (CFO), and estimation accuracy of symbol timing offset (STO). The proposed low-complexity joint algorithm for integer CFO estimation, cell searching, and downlink detection is robust to ICI, multipath channel, STO and fine CFO.