IQ Imbalance Compensation for OFDM Based Wireless LANs 


Vol. 32,  No. 9, pp. 905-912, Sep.  2007


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  Abstract

This paper proposes an efficient estimation and compensation scheme of IQ imbalance for OFDM-based WLAN systems in the presence of symbol timing error. Since the conventional scheme assumes perfect time synchronization, the criterion of the scheme used to derive the estimation of IQ imbalance is inadequate in the presence of the symbol timing error and the system performance is seriously degraded. New criterion and compensation scheme considering the effect of symbol timing error are proposed. With the proposed scheme, the IQ imbalance can be almost perfectly eliminated in the presence of symbol timing error. The bit error rate performance of the proposed scheme is evaluated by the simulation. In case of 54 Mbps transmission mode in IEEE 802.11a system, the proposed scheme achieves a SNR gain of 4.3dB at BER=2ㆍ10?³. The proposed compensation algorithm of IQ imbalance is implemented using Verilog HDL and verified. The proposed IQ imbalance compensator is composed of 74K logic gates and 6K bits memory from the synthesis result using 0.18um CMOS technology.

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  Cite this article

[IEEE Style]

J. Kim, Y. Jung, J. Kim, "IQ Imbalance Compensation for OFDM Based Wireless LANs," The Journal of Korean Institute of Communications and Information Sciences, vol. 32, no. 9, pp. 905-912, 2007. DOI: .

[ACM Style]

Jiho Kim, Yunho Jung, and Jaeseok Kim. 2007. IQ Imbalance Compensation for OFDM Based Wireless LANs. The Journal of Korean Institute of Communications and Information Sciences, 32, 9, (2007), 905-912. DOI: .

[KICS Style]

Jiho Kim, Yunho Jung, Jaeseok Kim, "IQ Imbalance Compensation for OFDM Based Wireless LANs," The Journal of Korean Institute of Communications and Information Sciences, vol. 32, no. 9, pp. 905-912, 9. 2007.

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pISSN : 1226 - 4717
eISSN : 2287 - 3880