In an OFDMA system, different carrier frequency offsets (CFOs) are possibly raised due to the mismatch of local oscillators and the Doppler effect because of multiple-antenna channels. In spite of an initial CFO synchronization scheme able to be applied at transmitters, the compensation of residual CFOs is required at the receiver in order to eliminate the inter-carrier interference (ICI) for individual subscribers, especially with an interleaved subcarrier allocation scheme. Unfortunately, conventional ICI mitigation methods cannot simultaneously remove the CFOs caused by multiple subscribers, and therefore, the multiuser interference (MUI) remains. In this case, a common CFO (CCFO) existing among the multiple CFOs is found in relation to the overall OFDMA system performance. In this paper, a CCFO estimation method is proposed at the OFDMA receiver, and the CCFO is then corrected to reach the minimum weighted mean square error (MSE) performance. Numerical results show that new OFDMA receivers after correcting the estimated CCFO significantly improve the overall bit error rate (BER) performance over the conventional receivers.
Published in | International Journal of Wireless Communications and Mobile Computing (Volume 2, Issue 3) |
DOI | 10.11648/j.wcmc.20140203.11 |
Page(s) | 35-41 |
Creative Commons |
This is an Open Access article, distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution and reproduction in any medium or format, provided the original work is properly cited. |
Copyright |
Copyright © The Author(s), 2014. Published by Science Publishing Group |
OFDMA, Carrier Frequency Offset, Inter-Carrier Interference, Multiuser Interference, Mean Square Error
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APA Style
Dah-Chung Chang, Yen-Heng Lai. (2014). Improving the OFDMA Performance with Common Carrier Frequency Offset Correction. International Journal of Wireless Communications and Mobile Computing, 2(3), 35-41. https://doi.org/10.11648/j.wcmc.20140203.11
ACS Style
Dah-Chung Chang; Yen-Heng Lai. Improving the OFDMA Performance with Common Carrier Frequency Offset Correction. Int. J. Wirel. Commun. Mobile Comput. 2014, 2(3), 35-41. doi: 10.11648/j.wcmc.20140203.11
AMA Style
Dah-Chung Chang, Yen-Heng Lai. Improving the OFDMA Performance with Common Carrier Frequency Offset Correction. Int J Wirel Commun Mobile Comput. 2014;2(3):35-41. doi: 10.11648/j.wcmc.20140203.11
@article{10.11648/j.wcmc.20140203.11, author = {Dah-Chung Chang and Yen-Heng Lai}, title = {Improving the OFDMA Performance with Common Carrier Frequency Offset Correction}, journal = {International Journal of Wireless Communications and Mobile Computing}, volume = {2}, number = {3}, pages = {35-41}, doi = {10.11648/j.wcmc.20140203.11}, url = {https://doi.org/10.11648/j.wcmc.20140203.11}, eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.wcmc.20140203.11}, abstract = {In an OFDMA system, different carrier frequency offsets (CFOs) are possibly raised due to the mismatch of local oscillators and the Doppler effect because of multiple-antenna channels. In spite of an initial CFO synchronization scheme able to be applied at transmitters, the compensation of residual CFOs is required at the receiver in order to eliminate the inter-carrier interference (ICI) for individual subscribers, especially with an interleaved subcarrier allocation scheme. Unfortunately, conventional ICI mitigation methods cannot simultaneously remove the CFOs caused by multiple subscribers, and therefore, the multiuser interference (MUI) remains. In this case, a common CFO (CCFO) existing among the multiple CFOs is found in relation to the overall OFDMA system performance. In this paper, a CCFO estimation method is proposed at the OFDMA receiver, and the CCFO is then corrected to reach the minimum weighted mean square error (MSE) performance. Numerical results show that new OFDMA receivers after correcting the estimated CCFO significantly improve the overall bit error rate (BER) performance over the conventional receivers.}, year = {2014} }
TY - JOUR T1 - Improving the OFDMA Performance with Common Carrier Frequency Offset Correction AU - Dah-Chung Chang AU - Yen-Heng Lai Y1 - 2014/10/30 PY - 2014 N1 - https://doi.org/10.11648/j.wcmc.20140203.11 DO - 10.11648/j.wcmc.20140203.11 T2 - International Journal of Wireless Communications and Mobile Computing JF - International Journal of Wireless Communications and Mobile Computing JO - International Journal of Wireless Communications and Mobile Computing SP - 35 EP - 41 PB - Science Publishing Group SN - 2330-1015 UR - https://doi.org/10.11648/j.wcmc.20140203.11 AB - In an OFDMA system, different carrier frequency offsets (CFOs) are possibly raised due to the mismatch of local oscillators and the Doppler effect because of multiple-antenna channels. In spite of an initial CFO synchronization scheme able to be applied at transmitters, the compensation of residual CFOs is required at the receiver in order to eliminate the inter-carrier interference (ICI) for individual subscribers, especially with an interleaved subcarrier allocation scheme. Unfortunately, conventional ICI mitigation methods cannot simultaneously remove the CFOs caused by multiple subscribers, and therefore, the multiuser interference (MUI) remains. In this case, a common CFO (CCFO) existing among the multiple CFOs is found in relation to the overall OFDMA system performance. In this paper, a CCFO estimation method is proposed at the OFDMA receiver, and the CCFO is then corrected to reach the minimum weighted mean square error (MSE) performance. Numerical results show that new OFDMA receivers after correcting the estimated CCFO significantly improve the overall bit error rate (BER) performance over the conventional receivers. VL - 2 IS - 3 ER -