Carrier Frequency Offset Estimation and I/Q Imbalance Compensation for OFDM Systems
<p/> <p>Two types of radio-frequency front-end imperfections, that is, carrier frequency offset and the inphase/quadrature (I/Q) imbalance are considered for orthogonal frequency division multiplexing (OFDM) communication systems. A preamble-assisted carrier frequency estimator is propos...
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Series: | EURASIP Journal on Advances in Signal Processing |
Online Access: | http://asp.eurasipjournals.com/content/2007/045364 |
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doaj-6d107c3444d9467faefdc7a14841e4f92020-11-25T00:24:05ZengSpringerOpenEURASIP Journal on Advances in Signal Processing1687-61721687-61802007-01-0120071045364Carrier Frequency Offset Estimation and I/Q Imbalance Compensation for OFDM SystemsYan FengZhu Wei-PingAhmad M Omair<p/> <p>Two types of radio-frequency front-end imperfections, that is, carrier frequency offset and the inphase/quadrature (I/Q) imbalance are considered for orthogonal frequency division multiplexing (OFDM) communication systems. A preamble-assisted carrier frequency estimator is proposed along with an I/Q imbalance compensation scheme. The new frequency estimator reveals the relationship between the inphase and the quadrature components of the received preamble and extracts the frequency offset from the phase shift caused by the frequency offset and the cross-talk interference due to the I/Q imbalance. The proposed frequency estimation algorithm is fast, efficient, and robust to I/Q imbalance. An I/Q imbalance estimation/compensation algorithm is also presented by solving a least-square problem formulated using the same preamble as employed for the frequency offset estimation. The computational complexity of the I/Q estimation scheme is further reduced by using part of the short symbols with a little sacrifice in the estimation accuracy. Computer simulation and comparison with some of the existing algorithms are conducted, showing the effectiveness of the proposed method.</p> http://asp.eurasipjournals.com/content/2007/045364 |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Yan Feng Zhu Wei-Ping Ahmad M Omair |
spellingShingle |
Yan Feng Zhu Wei-Ping Ahmad M Omair Carrier Frequency Offset Estimation and I/Q Imbalance Compensation for OFDM Systems EURASIP Journal on Advances in Signal Processing |
author_facet |
Yan Feng Zhu Wei-Ping Ahmad M Omair |
author_sort |
Yan Feng |
title |
Carrier Frequency Offset Estimation and I/Q Imbalance Compensation for OFDM Systems |
title_short |
Carrier Frequency Offset Estimation and I/Q Imbalance Compensation for OFDM Systems |
title_full |
Carrier Frequency Offset Estimation and I/Q Imbalance Compensation for OFDM Systems |
title_fullStr |
Carrier Frequency Offset Estimation and I/Q Imbalance Compensation for OFDM Systems |
title_full_unstemmed |
Carrier Frequency Offset Estimation and I/Q Imbalance Compensation for OFDM Systems |
title_sort |
carrier frequency offset estimation and i/q imbalance compensation for ofdm systems |
publisher |
SpringerOpen |
series |
EURASIP Journal on Advances in Signal Processing |
issn |
1687-6172 1687-6180 |
publishDate |
2007-01-01 |
description |
<p/> <p>Two types of radio-frequency front-end imperfections, that is, carrier frequency offset and the inphase/quadrature (I/Q) imbalance are considered for orthogonal frequency division multiplexing (OFDM) communication systems. A preamble-assisted carrier frequency estimator is proposed along with an I/Q imbalance compensation scheme. The new frequency estimator reveals the relationship between the inphase and the quadrature components of the received preamble and extracts the frequency offset from the phase shift caused by the frequency offset and the cross-talk interference due to the I/Q imbalance. The proposed frequency estimation algorithm is fast, efficient, and robust to I/Q imbalance. An I/Q imbalance estimation/compensation algorithm is also presented by solving a least-square problem formulated using the same preamble as employed for the frequency offset estimation. The computational complexity of the I/Q estimation scheme is further reduced by using part of the short symbols with a little sacrifice in the estimation accuracy. Computer simulation and comparison with some of the existing algorithms are conducted, showing the effectiveness of the proposed method.</p> |
url |
http://asp.eurasipjournals.com/content/2007/045364 |
work_keys_str_mv |
AT yanfeng carrierfrequencyoffsetestimationandiqimbalancecompensationforofdmsystems AT zhuweiping carrierfrequencyoffsetestimationandiqimbalancecompensationforofdmsystems AT ahmadmomair carrierfrequencyoffsetestimationandiqimbalancecompensationforofdmsystems |
_version_ |
1725354054890029056 |