An Enhanced Doppler Spread Estimation Method for OFDM Systems

Bin SHENG  Pengcheng ZHU  Xiaohu YOU  

Publication
IEICE TRANSACTIONS on Communications   Vol.E95-B   No.12   pp.3911-3914
Publication Date: 2012/12/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.E95.B.3911
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Wireless Communication Technologies
Keyword: 
cyclic prefix,  auto-correlation function,  OFDM,  

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Summary: 
In OFDM systems, the correlation of cyclic prefix (CP) with its corresponding part at the end of the symbol can be used to estimate the maximum Doppler spread. However, the estimation accuracy of this CP based method is seriously affected by the inter-symbol interference (ISI) generated in the multipath channel. In this letter, we propose an enhanced CP based method which is immune to the ISI and can hence obtain an unbiased estimate of the auto-correlation function in multipath channels.