A Comparative Analysis on Time Synchronization Schemes in OFDM Systems Based Upon Dispersive Cannel Model

JOURNAL OF BEIJING UNIVERSITY OF POSTS AND TELECOM

A Comparative Analysis on Time Synchronization Schemes in OFDM Systems Based Upon Dispersive Cannel Model

Telecommunication Engineering School, Beijing University of Posts and Telecommunications, Beijing 100876, China

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Abstract

Abstract: Time synchronization of O FDM systems is analyzed directly upon practical channel modeldispersive channel model. Two typical time synchronization and frame-start detecting schemes are surveyed. Theoretical analysis and simulation results suggest that, time and frequency estimators based on only cyclic prefix ( CP) are far inferior to those based upon pilot symbols. Simulation results also suggest that performance of CP based methods cannot be improved by increasing signalto-noise ratio ( SN R) . Hence, appropriately designed pilots are highly necessary for both time and frequency synchronization.

Key words: OFDM, time synchronization, cyclic prefix

CLC Number:

TN911. 23

KUANG Yujun,　 HOU Xiaolin,　 YUE Guang-xin . A Comparative Analysis on Time Synchronization Schemes in OFDM Systems Based Upon Dispersive Cannel Model[J]. JOURNAL OF BEIJING UNIVERSITY OF POSTS AND TELECOM.

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A Comparative Analysis on Time Synchronization Schemes in OFDM Systems Based Upon Dispersive Cannel Model

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