Blind Estimation of Carrier Frequency Offset, I/Q Imbalance and DC Offset for OFDM Systems
Sensitivity to Carrier Frequency Offset (CFO) is one of the biggest drawbacks of Orthogonal Frequency Division Multiplexing (OFDM) system. A lot of CFO estimation algorithms had been studied for compensation of CFO in OFDM system. However, with the adoption of Direct-Conversion Architecture (DCA), which introduces additional impairments such as DC Offset (DCO) and In-phase/Quadrature (I/Q) imbalance in OFDM system, the established CFO estimation algorithms suffer from performance degradation. In the authors' previous study, they developed a blind CFO, I/Q imbalance and DCO estimation algorithm for OFDM systems with DCA.