Improving the OFDMA Performance with Common Carrier Frequency Offset Correction

Dah-Chung Chang; Yen-Heng Lai

doi:doi:10.11648/j.wcmc.20140203.11

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Improving the OFDMA Performance with Common Carrier Frequency Offset Correction

Dah-Chung Chang, Yen-Heng Lai

Published in International Journal of Wireless Communications and Mobile Computing (Volume 2, Issue 3)

Received: 19 October 2014 Accepted: 28 October 2014 Published: 30 October 2014

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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.

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

Keywords

OFDMA, Carrier Frequency Offset, Inter-Carrier Interference, Multiuser Interference, Mean Square Error

References

[1]	S. Srikanth, P. A. Murugesa Pandian, and X. Femando, “Orthogonal frequency division multiple access in WiMAX and LTE: a comparison,” IEEE Commun. Mag., vol. 50, no. 9, pp. 153-161, Set. 2012.
[2]	S.-W. Hou and C. C. Ko, “Intercarrier interference suppression for OFDMA uplink in time- and frequency-selective fading channels,” IEEE Trans. Veh. Technol., vol. 58, no. 6, pp. 2741-2754, July 2009.
[3]	Z. Zhang and C. Tellambura, “The effect of imperfect carrier frequency offset estimation on an OFDMA uplink,” IEEE Trans. Commun., vol. 57, no. 4, pp. 1025-1030, Apr. 2009.
[4]	T. Yucek and H. Arsian, “Carrier frequency offset compensation with successive cancellation in uplink OFDMA systems,” IEEE Trans. Wireless Commun., vol. 6, no. 10, pp. 3546-3551, Oct. 2007.
[5]	J.-J. van de Beek et. al, “A time and frequency synchronization scheme for multiuser OFDM,” IEEE J. Sel. Areas Commun., vol. 17, no. 11, pp.1900-1913, Nov. 1999.
[6]	J. Choi, C. Lee, H. W. Jung, and Y. H. Lee, “Carrier frequency offset compensation for uplink of OFDM-FDMA systems,” IEEE Commun. Lett., vol. 4, no. 12, pp. 414-416, Dec. 2000.
[7]	D. Huang and K. B. Letaief, “An interference-cancellation scheme for carrier frequency offsets correction in OFDMA systems,” IEEE Trans. Commun., vol. 53, no. 7, pp. 1155-1165, July 2005.
[8]	M. Morelli, “Timing and frequency synchronization for the uplink of an OFDMA system,” IEEE Trans. Commun., vol. 52, no. 2, pp. 296-306, Feb. 2004.
[9]	M.-O. Pun, M. Morelli, and C.-C. Jay Kuo, “Maximum-likelihood synchronization and channel estimation for OFDMA uplink transmissions,” IEEE Trans. Commun., vol. 54, no. 4, pp. 726-736, Apr. 2006.
[10]	S. Manohar, D. Screedhar, V. Tikiya, and A. Chockalingam, “Cancellation of multiuser interference due to carrier frequency offsets in uplink OFDMA,” IEEE Trans. Wireless Commun., vol. 6, no. 7, pp.2560-2571, July 2007.
[11]	D.-C. Chang, Y.-H. Lai, and Y.-C. Hsu, “Effect of common carrier frequency offset at the OFDMA receiver,” in Proceeding of IEEE International symposium on Circuits and Systems (ISCAS), May 2009, pp.201-204.
[12]	S. Gaum and R. Kumar, “Performance analysis of OFDMA receiver with common carrier frequency offset (CCFO),” in Proceeding of 2012 World Congress on Information and Communication Technologies (WICT), Oct. 2012, pp. 266-271.

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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

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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

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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

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@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}
}

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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  -

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Author Information

Dah-Chung Chang

Department of Communication Engineering, National Central University, Jhongli City, Taoyuan 320, Taiwan
Yen-Heng Lai

Department of Communication Engineering, National Central University, Jhongli City, Taoyuan 320, Taiwan

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Plain Text BibTeX RIS

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

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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

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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

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@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}
}

Copy | Download

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  -

Copy | Download