Preamble-Assisted Estimation for Frequency-Dependent I/Q Mismatch in Direct-Conversion OFDM Receivers

Ming-Fu SUN  Terng-Yin HSU  

IEICE TRANSACTIONS on Communications   Vol.E92-B   No.7   pp.2426-2432
Publication Date: 2009/07/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.E92.B.2426
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Wireless Communication Technologies
carrier frequency offset,  direct-conversion receiver,  I/Q mismatch,  orthogonal frequency division multiplexing (OFDM),  wireless local area network (WLAN),  

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In direct-conversion orthogonal frequency division multiplexing (OFDM) receivers, the impact of frequency-dependent I/Q mismatch (IQ-M) with carrier frequency offset (CFO) must be considered. A preamble-assisted estimation is developed to circumvent the frequency-dependent IQ-M with CFO. The results of a simulation and an experiment show that the proposed method could provide good estimation efficiency and enhance the system performance. Moreover, the proposed scheme is compatible with current wireless local area network standards.