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OFDM Equalization – IQ-Imbalance Compensation in the Presence of IBI and CFO

OFDM Equalization – IQ-Imbalance Compensation in the Presence of IBI and CFO. R94944007 Kuo-Hsing Juan. OFDM. OFDM (Orthogonal Frequency Division Multiplexing) Use N overlapped orthogonal sub-carriers to carry information. CFO. CFO (Carrier Frequency Offset)

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OFDM Equalization – IQ-Imbalance Compensation in the Presence of IBI and CFO

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  1. OFDM Equalization – IQ-Imbalance Compensation in the Presence of IBI and CFO R94944007 Kuo-Hsing Juan

  2. OFDM • OFDM (Orthogonal Frequency Division Multiplexing) • Use N overlapped orthogonal sub-carriers to carry information

  3. CFO • CFO (Carrier Frequency Offset) • Local oscillators are not synchronized well • Introduce ICI (results in the data disturbance)

  4. IBI • IBI (Inter Block Interference) • Wireless channels are usually multi-path fading channels • If the channel impulse response length is larger than the guard interval length in OFDM systems, this results in IBI.

  5. IQ-Imbalance • IQ-imbalance arises when the signal in I and Q channels do not meet the orthogonality and the power balance.

  6. Motivation • The analog front-end imperfections (IQ-Imbalance and CFO) and poor channel condition (IBI effect) cause a severe degradation in performance for OFDM systems. • Study the equalization techniques that are robust against the imperfections.

  7. Plan • Model the channel condition and OFDM system • Take CFO, IBI and IQ-Imbalance into consideration • Study the equalization techniques • Implement the equalization techniques • Simulation

  8. Reference • [1] Jui-Yuan Yu, Ming-Fu Sun, Terng-Yin Hsu, Chen-Yi Lee, "A novel technique for I/Q imbalance and CFO compensation in OFDM systems," 2005 IEEE International Symposium onCircuits and Systems, pp. 6030- 6033, vol. 6, 23-26 May 2005 • [2] I. Barhumi, M. Moonen, "IQ-Imbalance Compensation for OFDM in the Presence of IBI and Carrier-Frequency Offset," IEEE Transactions on Signal Processing, vol.55, no.1, pp.256-266, Jan. 2007 • [3] J. Tubbax, A. Fort, L. Van der Perre, S. Donnay, M. Engels, M. Moonen, H. De Man, "Joint compensation of IQ imbalance and frequency offset in OFDM systems," 2003Global Telecommunications Conference, vol.4, pp. 2365- 2369, 1-5 Dec. 2003

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