Abstract
Radio frequency impairments such as in-phase/quadrature-phase (IQ) imbalances can result in a severe performance degradation in direct-conversion architectures. In this paper, a training based equalizer is developed to estimate and compensate the effects of these IQ imbalances along with channel distortions in an OFDM system. The proposed scheme provides a decoupling mechanism to estimate all the three frequency selective distortions in the communication system, namely the transmitter IQ imbalance, the receiver IQ imbalance and the channel dispersion. Once the IQ imbalance parameters are estimated, the proposed scheme then utilizes a standard one tap frequency domain equalizer to estimate and compensate the channel variations in the system. Simulation results show that the resulting calibrated equalizer requires a very small training overhead for an efficient, post-FFT equalization with performance very close to the ideal case.
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References
A.A. Abidi, “Direct-conversion radio transceivers for digital communications”, IEEE Journal on Solid-State Circuits, vol. 30, pp. 1399–1410, Dec. 1995.
“IEEE standard 802.11a-1999: wireless LAN medium access control (MAC) & physical layer (PHY) specifications, high-speed physical layer in the 5 GHz band,” 1999.
C.L. Liu, “Impact of I/Q imbalance on QPSK-OFDM-QAM detection”, IEEE Transactions on Consumer Electronics, vol. 44, no. 8, pp. 984–989, Aug. 1998.
T. Pollet, M. Van Bladel and M. Moeneclaey, “BER sensitivity of OFDM systems to carrier frequency offset and wiener phase noise,” IEEE Transactions on Communications, vol. 43, no. (2/3/4), pp. 191–193, 1995.
J. Tubbax, B. Come, L. Van der Perre, M. Engels, M. Moonen and H. De Man, “Joint compensation of IQ imbalance and carrier frequency offset in OFDM systems”, in Proceedings Radio and Wireless Conference, Boston, MA, pp. 39–42, Aug. 2003.
A. Tarighat and A.H. Sayed. “OFDM systems with both transmitter & receiver IQ imbalances”, in Proceedings IEEE 6th SPAWC Workshop, New York, NY, pp. 735–739, June 2005.
T. Schenck, P. Smulders and E.Fledderus, “Estimation and compensation of frequency selective Tx/Rx IQ imbalance in MIMO OFDM systems”, in Proceedings IEEE ICC, Istanbul, Turkey, pp. 251–256, June 2006.
D. Tandur and M. Moonen, “Joint compensation of OFDM frequency selective transmitter and receiver IQ imbalance”, Eurasip Journal on Wireless Communications and Networking (JWCN), Volume 2007 (2007).
L. Anttila, M. Valkama and M. Renfors, “Efficient mitigation of frequency-selective I/Q imbalances in OFDM receivers”, in Proceedings IEEE 68th VTC conference, Calgary, Canada, Sept. 2008.
M. Valkama, M. Renfors and V. Koivunen, “Compensation of frequency-selective IQ imbalances in wideband receivers: models and algorithms”, in Proceedings IEEE 3rd Workshop on Signap Processing Advances in Wireless Communications (SPAWC), Taoyuan, Taiwan, pp. 42– 45, Mar. 2001.
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Tandur, D., Moonen, M. (2009). Efficient Compensation of Frequency Selective TX and RX IQ Imbalances in OFDM Systems. In: Plass, S., Dammann, A., Kaiser, S., Fazel, K. (eds) Multi-Carrier Systems & Solutions 2009. Lecture Notes in Electrical Engineering, vol 41. Springer, Dordrecht. https://doi.org/10.1007/978-90-481-2530-2_33
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DOI: https://doi.org/10.1007/978-90-481-2530-2_33
Publisher Name: Springer, Dordrecht
Print ISBN: 978-90-481-2529-6
Online ISBN: 978-90-481-2530-2
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