Abstract
In this article, we propose a time-spreaded quasi-orthogonal space-frequency coded OFDM system with constellation rotation. A constellation rotated quasi-orthogonal OFDM system could offer full rate and full diversity in a frequency selective fading channel. Time spreading can give additional time diversity gain in a fast fading channel. Assuming that complex channel gains between adjacent subcarriers are approximately equal, we develop a coding scheme for 4 × 1 MISO transceiver and its BER performance is evaluated for different Doppler frequencies in an OFDM system. The simulation results show that 2 dB gain can be achieved at BER of 10−3 using the proposed scheme compared to a scheme without time spreading and constellation rotation when 512 subcarriers are used at maximum Doppler frequency of 300 Hz. Also, the proposed system is analyzed for different delay spread of the channel and the results show that if adjacent subcarriers are correlated, it is better in SF-OFDM decoding.
This is a preview of subscription content, log in via an institution to check access.
References
Bolcskei H. (2006) MIMO-OFDM wireless systems: Basics, perspectives, and challenges. IEEE Transactions on Wireless Communications 13: 31–37
Goldsmith A. (2005) Wireless communications. Cambridge University Press, Cambridge
Zhang W., Xia X.-G., Letaief K. (2007) Space-time/frequency coding for MIMO-OFDM in next generation broadband wireless systems. IEEE Transactions on Wireless Communications 14: 32–43
Alamouti S. M. (1998) A simple transmit diversity technique for wireless communications. IEEE Journal on Selected Areas in Communications 16: 1451–1458
Tarokh V., Jafarkhani H., Calderbank A. R. (1999) Space-time block codes from orthogonal designs. IEEE Transactions on Information Theory 45: 1456–1467
Jafarkhani H. (2001) A quasi-orthogonal space-time block code. IEEE Transactions on Communications 49: 1–4
Sharma N., Papadias C. (2003) Improved quasi-orthogonal codes through constellation rotation. IEEE Transactions on Communications 51: 332–335
Lee, K. F., & Williams, D. B. (March 2000). A space-time coded transmitter diversity technique for frequency selective fading channels. In Proceedings of the IEEE Sensor Array and Multichannel Signal Processing Workshop, Cambridge, MA, pp. 149–152.
Lee K. F., Williams D. B. (2000) A space-frequency transmitter diversity technique for OFDM system. Proceedings of the IEEE Global Telecommunications Conference 3: 1473–1476
Sang-Soon P., Han-Kyoung K., Heung-Ki B. (2004) A simple STF-OFDM transmission scheme for fast fading channel. Proceedings of the IEEE Vehicular Technology Conference 7: 5068–5071
Yu G., Kang J. (2004) Quasi-orthogonal space-frequency block code. Proceedings of the IEEE International Symposium on Communications and Information Technology 2: 979–982
Papadias C., Foschini G. (2001) A space-time coding approach for systems employing four transmit antennas. Proceedings of the IEEE International Conference on Acoustics, Speech and Signal Processing 4: 2481–2484
Wang F., Gosh A., Sankaran C., Fleming P. J., Hsieh F., Benes S. (2008) Mobile WiMAX systems: Performance and evolution. IEEE Communications Magazine 46: 41–49
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Senthuran, S., Anpalagan, A., Das, O. et al. On the Performance of a Constellation-rotated Time-spreaded Space-frequency Coding Scheme for 4 × 1 MISO OFDM Transceivers. Wireless Pers Commun 60, 251–262 (2011). https://doi.org/10.1007/s11277-010-9941-7
Published:
Issue Date:
DOI: https://doi.org/10.1007/s11277-010-9941-7