OFDM Channel Estimation in the Presence of Receiver I/Q Imbalance and CFO Using Pilot Symbols

Yuan-Hwui CHUNG  See-May PHOONG  

IEICE TRANSACTIONS on Communications   Vol.E95-B   No.2   pp.531-539
Publication Date: 2012/02/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.E95.B.531
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Wireless Communication Technologies
OFDM,  channel estimation,  I/Q imbalance,  CFO,  

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In this paper, we study the channel estimation in the presence of the receiver in-phase and quadrature-phase (I/Q) imbalance and carrier frequency offset (CFO) for orthogonal frequency division multiplexing (OFDM) systems using pilot symbols. The concept of channel residual energy (CRE) [9] is used to solve the joint estimation problem. By minimizing the CRE, we can jointly estimate the receiver I/Q, CFO and channel response using the pilot symbols in one OFDM block. Simulation results show that the proposed method can provide good performance and also works well when applied to the terrestrial digital video broadcasting (DVB-T) systems.