Adaptive Joint Semi-blind Estimation of CFO and Channel for OFDM Systems
The large number of subcarriers, used in OFDM systems, increases the sensivity to frequency offset which results from a Doppler shift, due to mobile movement, as well as from a mismatch between the carrier frequencies at the transmitter and receiver. The problem of channel estimation in a practical...
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| Veröffentlicht in: | Wireless personal communications 2015-03, Vol.81 (2), p.473-487 |
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| container_title | Wireless personal communications |
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| creator | Besseghier, Mokhtar Djebbar, Ahmed Bouzidi Dayoub, Iyad |
| description | The large number of subcarriers, used in OFDM systems, increases the sensivity to frequency offset which results from a Doppler shift, due to mobile movement, as well as from a mismatch between the carrier frequencies at the transmitter and receiver. The problem of channel estimation in a practical OFDM receiver that suffers from CFO has been addressed in this paper. We first derived the modified MUSIC based blind CFO estimator. Next, we propose new joint training-based and joint semi-blind CFO and channel estimation for OFDM systems. Whereas the training-based estimator only assumes knowledge of pilot tones, the semi-blind estimator assumes knowledge of the virtual subcarriers (VSCs). For both estimators we derive a maximum likelihood (ML) algorithm for block processing and LMS algorithm for adaptive processing. It is demonstrated that the CFO estimators are able to perform well with a very small number of OFDM blocks. The performance of our estimators was investigated by simulations. |
| doi_str_mv | 10.1007/s11277-014-2139-7 |
| format | Article |
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| ispartof | Wireless personal communications, 2015-03, Vol.81 (2), p.473-487 |
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| subjects | Artificial Intelligence Communications Engineering Computer Communication Networks Computer Science Electronics Engineering Engineering Sciences Networking and Internet Architecture Networks Signal and Image processing Signal,Image and Speech Processing |
| title | Adaptive Joint Semi-blind Estimation of CFO and Channel for OFDM Systems |
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