The original paper is in English. Non-English content has been machine-translated and may contain typographical errors or mistranslations. ex. Some numerals are expressed as "XNUMX".
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The original paper is in English. Non-English content has been machine-translated and may contain typographical errors or mistranslations. Copyrights notice
Os receptores de conversão direta em sistemas de multiplexação por divisão ortogonal de frequência (OFDM) sofrem de deslocamento de corrente contínua (DC), deslocamento de frequência e desequilíbrio de QI. Propusemos um esquema de estimativa de desequilíbrio de QI na presença de deslocamento DC e deslocamento de frequência, que utiliza sinais de preâmbulo no domínio do tempo. Neste esquema, o deslocamento DC é eliminado por um filtro diferencial. No entanto, a precisão da estimativa do desequilíbrio de QI é deteriorada quando o deslocamento de frequência é pequeno. Para superar este problema, um novo esquema de estimativa de desequilíbrio de QI no domínio da frequência com o filtro diferencial foi proposto neste artigo. O desequilíbrio de QI é estimado com subportadoras piloto. Os resultados numéricos obtidos por meio de simulação computacional mostram que a precisão da estimativa e o desempenho da taxa de erro de bit (BER) podem ser melhorados mesmo se o deslocamento de frequência for pequeno.
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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 -