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Direct conversion receivers in orthogonal frequency division multiplexing (OFDM) systems suffer from direct current (DC) offset, frequency offset, and IQ imbalance. We have proposed an IQ imbalance estimation scheme in the presence of DC offset and frequency offset, which uses preamble signals in the time domain. In this scheme, the DC offset is eliminated by a differential filter. However, the accuracy of IQ imbalance estimation is deteriorated when the frequency offset is small. To overcome this problem, a new IQ imbalance estimation scheme in the frequency domain with the differential filter has been proposed in this paper. The IQ imbalance is estimated with pilot subcarriers. Numerical results obtained through computer simulation show that estimation accuracy and bit error rate (BER) performance can be improved even if the frequency offset is small.

- Publication
- IEICE TRANSACTIONS on Fundamentals Vol.E92-A No.11 pp.2688-2696

- Publication Date
- 2009/11/01

- Publicized

- Online ISSN
- 1745-1337

- DOI
- 10.1587/transfun.E92.A.2688

- Type of Manuscript
- Special Section PAPER (Special Section on Wideband Systems)

- Category

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Mamiko INAMORI, Shuzo TAKAYAMA, Yukitoshi SANADA, "IQ Imbalance Estimation Scheme in the Presence of DC Offset and Frequency Offset in the Frequency Domain" in IEICE TRANSACTIONS on Fundamentals,
vol. E92-A, no. 11, pp. 2688-2696, November 2009, doi: 10.1587/transfun.E92.A.2688.

Abstract: Direct conversion receivers in orthogonal frequency division multiplexing (OFDM) systems suffer from direct current (DC) offset, frequency offset, and IQ imbalance. We have proposed an IQ imbalance estimation scheme in the presence of DC offset and frequency offset, which uses preamble signals in the time domain. In this scheme, the DC offset is eliminated by a differential filter. However, the accuracy of IQ imbalance estimation is deteriorated when the frequency offset is small. To overcome this problem, a new IQ imbalance estimation scheme in the frequency domain with the differential filter has been proposed in this paper. The IQ imbalance is estimated with pilot subcarriers. Numerical results obtained through computer simulation show that estimation accuracy and bit error rate (BER) performance can be improved even if the frequency offset is small.

URL: https://global.ieice.org/en_transactions/fundamentals/10.1587/transfun.E92.A.2688/_p

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@ARTICLE{e92-a_11_2688,

author={Mamiko INAMORI, Shuzo TAKAYAMA, Yukitoshi SANADA, },

journal={IEICE TRANSACTIONS on Fundamentals},

title={IQ Imbalance Estimation Scheme in the Presence of DC Offset and Frequency Offset in the Frequency Domain},

year={2009},

volume={E92-A},

number={11},

pages={2688-2696},

abstract={Direct conversion receivers in orthogonal frequency division multiplexing (OFDM) systems suffer from direct current (DC) offset, frequency offset, and IQ imbalance. We have proposed an IQ imbalance estimation scheme in the presence of DC offset and frequency offset, which uses preamble signals in the time domain. In this scheme, the DC offset is eliminated by a differential filter. However, the accuracy of IQ imbalance estimation is deteriorated when the frequency offset is small. To overcome this problem, a new IQ imbalance estimation scheme in the frequency domain with the differential filter has been proposed in this paper. The IQ imbalance is estimated with pilot subcarriers. Numerical results obtained through computer simulation show that estimation accuracy and bit error rate (BER) performance can be improved even if the frequency offset is small.},

keywords={},

doi={10.1587/transfun.E92.A.2688},

ISSN={1745-1337},

month={November},}

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TY - JOUR

TI - IQ Imbalance Estimation Scheme in the Presence of DC Offset and Frequency Offset in the Frequency Domain

T2 - IEICE TRANSACTIONS on Fundamentals

SP - 2688

EP - 2696

AU - Mamiko INAMORI

AU - Shuzo TAKAYAMA

AU - Yukitoshi SANADA

PY - 2009

DO - 10.1587/transfun.E92.A.2688

JO - IEICE TRANSACTIONS on Fundamentals

SN - 1745-1337

VL - E92-A

IS - 11

JA - IEICE TRANSACTIONS on Fundamentals

Y1 - November 2009

AB - Direct conversion receivers in orthogonal frequency division multiplexing (OFDM) systems suffer from direct current (DC) offset, frequency offset, and IQ imbalance. We have proposed an IQ imbalance estimation scheme in the presence of DC offset and frequency offset, which uses preamble signals in the time domain. In this scheme, the DC offset is eliminated by a differential filter. However, the accuracy of IQ imbalance estimation is deteriorated when the frequency offset is small. To overcome this problem, a new IQ imbalance estimation scheme in the frequency domain with the differential filter has been proposed in this paper. The IQ imbalance is estimated with pilot subcarriers. Numerical results obtained through computer simulation show that estimation accuracy and bit error rate (BER) performance can be improved even if the frequency offset is small.

ER -