TY - GEN
T1 - Frequency domain IQ imbalance estimation in the presence of DC offset and frequency offset
AU - Inamori, Mamiko
AU - Takayama, Shuzo
AU - Sanada, Yukitoshi
PY - 2009
Y1 - 2009
N2 - 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 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.
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 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.
UR - http://www.scopus.com/inward/record.url?scp=77952796479&partnerID=8YFLogxK
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U2 - 10.1109/PIMRC.2009.5450294
DO - 10.1109/PIMRC.2009.5450294
M3 - Conference contribution
AN - SCOPUS:77952796479
SN - 9781424451234
T3 - IEEE International Symposium on Personal, Indoor and Mobile Radio Communications, PIMRC
SP - 1577
EP - 1581
BT - 2009 IEEE 20th Personal, Indoor and Mobile Radio Communications Symposium, PIMRC 2009
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 2009 IEEE 20th Personal, Indoor and Mobile Radio Communications Symposium, PIMRC 2009
Y2 - 13 September 2009 through 16 September 2009
ER -