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Adaptive Timing Synchronization Algorithm for WiBro Uplink  

Kim, Jeong-Been (충남대학교 전자전파정보통신공학부 이동멀티미디어통신 연구실)
Jin, Young-Hwan (충남대학교 전자전파정보통신공학부 이동멀티미디어통신 연구실)
Kim, Kyung-Soo (전자통신연구원)
Ahn, Jae-Min (충남대학교 전자전파정보통신공학부 이동멀티미디어통신 연구실)
Publication Information
The Journal of Korean Institute of Communications and Information Sciences / v.31, no.11A, 2006 , pp. 1068-1075 More about this Journal
Abstract
An adaptive ranging technique for Orthogonal Frequency Division Multiple Access(OFDMA) uplink transmission is proposed for timing synchronization of multiple mobile stations located different distances from a base station. By combining the Timing Phase Compensated Frequency Domain Cross-correlation(TPCFDC) and Frequency Domain Differential Cross-correlation(FDDC), the proposed scheme reduces the number of correlators used in ordinary TPCFDC. Repeated initial ranging attempt with the FDDC in the proposed scheme greatly reduces the hardware implementation complexity. Simulation results for ranging success probability and average ranging attempts count show that the proposed algorithm performs similarly with the ordinary TPCFDC even with the 10 times reduced complexity.
Keywords
OFDMA; Initial ranging; Adaptive timing synchronization;
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  • Reference
1 Slawomir Pietrzyk, 'OFDMA for Broadband Wireless Access' Artech House Publishers; 1st edition, April 30, 2006
2 IEEE LAN/MAN Standard Commitee, 'Broadband Wireless Access: IEEE MAN standard,' IEEE 802.16e-D11, 2005
3 X. Fu and H. Minn, 'Initial uplink synchronization and power control (ranging process) for OFDMA systems,' IEEE Globecom' 2004, pp.3999-4003