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http://dx.doi.org/10.5515/KJKIEES.2008.19.9.1028

Compensation of OFDM Signal Degraded by Phase Noise and IQ Imbalance  

Ryu, Sang-Burm (School of Electrical and Computer Engineering, Chungbuk National University)
Kim, Sang-Kyun (School of Electrical and Computer Engineering, Chungbuk National University)
Ryu, Heung-Gyoon (School of Electrical and Computer Engineering, Chungbuk National University)
Publication Information
The Journal of Korean Institute of Electromagnetic Engineering and Science / v.19, no.9, 2008 , pp. 1028-1036 More about this Journal
Abstract
In the OFDM system, IQ imbalance problem happens at the RF front-end of transceiver, which degrades the BER(bit error rate) performance because it affects the constellation in the received signal. Also, phase noise is generated in the local oscillator of transceivers and it destroys the orthogonality between the subcarriers. Conventional PNS algorithm is effective for phase noise suppression, but it is not useful anymore when there are jointly IQ(In-phase and Quadrature) imbalance and phase noise. Therefore, in this paper, we analyze the effect of IQ imbalance and phase noise generated in the down-conversion of the receiver. Then, we estimate and compensate the IQ imbalance and phase noise at the same time. Compared with the conventional method that IQ imbalance after IFFT is estimated and compensated in front of FFT via the feedback, this proposed method extracts and compensates effect of IQ imbalance after FFT stage. In case IQ imbalance and phase noise exist at the same time, we can decrease complexity because it is needless to use elimination of IQ imbalance in time domain and training sequences and preambles. Also, this method shows that it reduces the ICI and CPE component using adaptive forgetting factor of MMSE after FFT.
Keywords
OFDM; IQ Imbalance; Phase Noise; ICI;
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