Modified Guard Band Power Detection for Coarse Carrier Frequency Offset Recovery in OFDM System |
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Authors: | Yen-Ju Huang Shyue-Win Wei |
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Affiliation: | (1) Department of Electrical Engineering, National Chi Nan University, 1 Univ. Rd., Puli, 545, Taiwan, ROC |
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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.
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Keywords: | Orthogonal frequency division multiplexing (OFDM) Coarsecarrier frequency offset (CFO) recovery Guard band power (GPD)detection |
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