Modified Guard Band Power Detection for Coarse Carrier Frequency Offset Recovery in OFDM System

Authors:
Yen-Ju Huang;Shyue-Win Wei
Affiliations:
Department of Electrical Engineering, National Chi Nan University, Puli, Taiwan, ROC 545;Department of Electrical Engineering, National Chi Nan University, Puli, Taiwan, ROC 545
Venue:
Wireless Personal Communications: An International Journal
Year:
2008

Citing 2
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ML estimation of time and frequency offset in OFDM systems

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Performance evaluation of the frequency detectors for orthogonal frequency division multiplexing

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Abstract

Conventional guard band power detection (GPD) method for orthogonal frequency division multiplexing (OFDM) coarse carrier frequency offset (CFO) estimation has to be operated after the fine CFO recovery due to its sensitivity to the inter-channel interference (ICI). In the paper, modified GPD methods are presented for OFDM system to obtain more accurate estimation of CFO. The accuracy of GPD estimation can be first improved with a simple operation of power average. Then, extending the idea of Reference symbol Power Adjustment (RPA), two general patterns of sub-carrier power adjustment to improve the estimation performance under nonzero fine CFO are presented. According to complete simulations under the COST 207 multi-path fading channel, estimation performance with the presented modified GPD methods can be significantly improved and therefore can be concurrently operated with the fine carrier offset adjustment.