Progress In Electromagnetics Research
ISSN: 1070-4698, E-ISSN: 1559-8985
Home | Search | Notification | Authors | Submission | PIERS Home | EM Academy
Home > Vol. 81 > pp. 213-223


By Y.-D. Lee, D.-H. Park, and H.-K. Song

Full Article PDF (351 KB)

This paper presents an investigation into improving the channel estimation scheme and reducing the effects of symbol timing misalignment when OFDMA is used as an access scheme. Under OFDMA uplink channel environments, appropriate symbol length of CAZAC sequences as a preamble could be utilized in accordance with the number of transmitting antenna and channel condition. The effect of the number of CAZAC sequences for channel estimation is also presented in terms of mean square error (MSE). Taking into account the effect of multiple access interference (MAI) introduced by a symbol timing misalignment, the symbol error rate (BER) and throughput performance are investigated for a typical OFDMA uplink scenario.

Y.-D. Lee, D.-H. Park, and H.-K. Song, "Improved channel estimation and MAI-robust schemes for wireless ofdma system," Progress In Electromagnetics Research, Vol. 81, 213-223, 2008.

1. Hosseini, S. A., Z. Atlasbaf, and K. Forooraghi, "A new compact ultra wide band (UWB) planar antenna using glass as substrate," Journal of Electromagnetic Waves and Applications, Vol. 22, No. 1, 47-59, 2008.

2. Siahcheshm, A., S. Sadat, C. Ghobadi, and J. Nourinia, "Design of a microstrip slot antenna filled by an isosceles triangle for UWB applications," Journal of Electromagnetic Waves and Applications, Vol. 22, No. 1, 111-118, 2008.

3. Ren, W., Z. G. Shi, and K. S. Chen, "Novel planar monopole UWB antenna with 5-GHz band-notched characteristic," Journal of Electromagnetic Waves and Applications, Vol. 21, No. 12, 1645-1652, 2007.

4. Naghshvarian-Jahromi, M., "Compact UWB bandnotch antenna with transmission-line-fed," Progress In Electromagnetics Research B, Vol. 3, 283-293, 2008.

5. El-Fishawy, N., M. Shokair, and W. Saad, "Proposed Mac protocol versus IEEE 802.15.3a for multimedia transmission over UWB networks," Progress In Electromagnetics Research B, Vol. 2, 189-206, 2008.

6. Xiao, S., J. Chen, X.-F. Liu, and B.-Z. Wang, "Spatial focusing characteristics of time reversal UWB pulse transmission with different antenna arrays," Progress In Electromagnetics Research B, Vol. 2, 223-232, 2008.

7. Yin, X.-C., C. Ruan, C.-Y. Ding, and J.-H. Chu, "A planar U type monopole antenna for UWB applications," Progress In Electromagnetics Research Letters, Vol. 2, 1-10, 2008.

8. Khan, S. N., J. Hu, J. Xiong, and S. He, "Circular fractal monopole antenna for low VSWR UWB applications," Progress In Electromagnetics Research Letters, Vol. 1, 19-25, 2008.

9. ETSI ETS 301 958, "Digital Video Broadcasting (DVB); interaction channel for digital terrestrial television (RCT) incorporating multiple access OFDM," ETSI, No. 3, 2002.

10. IEEE LAN MAN Standards Committee, ``IEEE draft standard for local, "IEEEdraftstandardforlocalandmetropolitanareanetwork-part16:Airinterfaceforfixedbroadbandwirelessaccesssystems-mediumaccesscontrolmodificationsandadditionalphysicallayerspecificationsfor2-11GHz," 2002., 2-11, 2002.

11. Koffman, I. and V. Roman, "Broadband wireless access solutions based on OFDM access in IEEE802.16," IEEE Commun. Mag., Vol. 40, No. 4, 96-103, 2002.

12. Min, K.-S., M.-S. Kim, C.-K. Park, and M. D. Vu, "Design for PCS antenna based on WiBro-MIMO," Progress In Electromagnetics Research Letters, Vol. 1, 77-83, 2008.

13. Arikan, F., "A brief review of HF channel response estimation," Journal of Electromagnetic Waves and Applications, Vol. 18, No. 6, 837-851, 2004.

14. Chen, C. H., C. L. Liu, C. C. Chiu, and T. M. Hu, "Ultrawide band channel calculation by SBR/image techniques for indoor communication," Journal of Electromagnetic Waves and Applications, Vol. 20, No. 1, 41-51, 2006.

15. Cho, D. J., Y. H. You, and H. K. Song, "Channel estimation with transmitter diversity for high rate WPAN systems," IEICE Trans. Commun., Vol. E87-B, No. 11, 87, 2004.

16. You, Y.-H., W.-G. Jeon, J.-W. Wee, S.-T. Kim, I. Hwang, and H.-K. Song, "OFDMA uplink performance for interactive wireless broadcasting," IEEE Trans. Broadcast., Vol. 51, No. 3, 383-388, 2005.

17. El-Tanany, M. S., Y. Wu, and L. Hazy, "OFDM uplink for interactive broadband wireless: Analysis and simulation in the presence of carrier, clock an timing errors," IEEE Trans. Broadcast., Vol. 47, No. 1, 3-19, 2001.

18. Park, M., K. Ko, H. Yoo, and D. Hong, "Performance analysis of OFDMA uplink systems with symbol timing misalignment," IEEE Commun. Lett., Vol. 7, No. 8, 376-378, 2003.

19. Tonello, A., N. Laurenti, and S. Pupolin, On the effect of time and frequency offsets in the uplink of an asynchronous multiuser DMT OFDMA system, Proc. of Intemutioml Conference on Telecommunications 2000, No. 5, 614-618, 2000.

20. Heimiller, R. C., "Phase shift pulse codes with good periodic correlation properties," IRE Trans. Info. Theory, Vol. 6, No. 10, 254-257, 1961.

© Copyright 2014 EMW Publishing. All Rights Reserved