A novel compensation scheme for I/Q mismatch in OFDM low-if receiver

Junghwa Bae, Won Ha, Heekwon Ko, Kyuyeol Han, Jinwoo Park

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

I/Q processing structures widely used in today's communication receivers, such as the low-IF and direct conversion architecture, face serious problem of I/Q mismatch. In practice, due to the problem of analog part, such mismatch is unavoidable, which results in finite and insufficient rejection of the image signal. These effects cause the desired signal to be interfered by image signal. In this paper, we focus on the low-IF receiver based on OFDM technique as today's popular transmission method. So, we carried out signal analysis and effects of mismatched I/Q processing in the OFDM low-IF receiver. Also, we proposed a new scheme that can compensate I/Q mismatch by least squares method using null-carriers of OFDM symbol. And, the computer simulation results are provided in order to evaluate the performance of the proposed schemes. From the simulation results, the mismatch problem could be perfectly compensated by using only one OFDM symbol.

Original languageEnglish
Title of host publicationProceedings of the Fourth IASTED International Multi-Conference on Wireless and Optical Communications
EditorsA.O. Fapojuwo
Pages340-345
Number of pages6
Publication statusPublished - 2004 Dec 1
EventProceedings of the Fourth IASTED International Multi-Conference on Wireless and Optical Communications - Banff, Canada
Duration: 2004 Jul 82004 Jul 10

Other

OtherProceedings of the Fourth IASTED International Multi-Conference on Wireless and Optical Communications
CountryCanada
CityBanff
Period04/7/804/7/10

Keywords

  • Direct-conversion receiver
  • I/Q imbalance
  • I/Q mismatch
  • Low-IF receiver
  • SDR
  • Software-defined radio

ASJC Scopus subject areas

  • Engineering(all)

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  • Cite this

    Bae, J., Ha, W., Ko, H., Han, K., & Park, J. (2004). A novel compensation scheme for I/Q mismatch in OFDM low-if receiver. In A. O. Fapojuwo (Ed.), Proceedings of the Fourth IASTED International Multi-Conference on Wireless and Optical Communications (pp. 340-345). [422-090]