Channel Estimation for OFDM-Based WLANs in the Presence of Wiener Phase Noise and Residual Frequency Offset

Yong-Hwa KIM  Jong-Ho LEE  Seong-Cheol KIM  

IEICE TRANSACTIONS on Communications   Vol.E89-B   No.5   pp.1709-1712
Publication Date: 2006/05/01
Online ISSN: 1745-1345
DOI: 10.1093/ietcom/e89-b.5.1709
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Wireless Communication Technologies
orthogonal frequency-division multiplexing (OFDM),  channel estimation,  phase noise (PHN),  residual frequency offset (RFO),  wireless local area networks (WLANs),  

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In orthogonal frequency-division multiplexing (OFDM)-based wireless local area networks (WLANs), phase noise (PHN) and residual frequency offset (RFO) can cause the common phase error (CPE) and the inter-carrier interferences (ICI), which seriously degrade the performance of systems. In this letter, we propose a combined pilot symbol assisted and decision-directed channel estimation scheme based on the least-squares (LS) and the maximum-likelihood (ML) algorithms. Simulation results present that the proposed scheme significantly improves the performance of OFDM-based WLANs.