Commenced in January 2007
Frequency: Monthly
Edition: International
Paper Count: 31584
Bandwidth Efficient Diversity Scheme Using STTC Concatenated With STBC: MIMO Systems

Authors: Sameru Sharma, Sanjay Sharma, Derick Engles


Multiple-input multiple-output (MIMO) systems are widely in use to improve quality, reliability of wireless transmission and increase the spectral efficiency. However in MIMO systems, multiple copies of data are received after experiencing various channel effects. The limitations on account of complexity due to number of antennas in case of conventional decoding techniques have been looked into. Accordingly we propose a modified sphere decoder (MSD-1) algorithm with lower complexity and give rise to system with high spectral efficiency. With the aim to increase signal diversity we apply rotated quadrature amplitude modulation (QAM) constellation in multi dimensional space. Finally, we propose a new architecture involving space time trellis code (STTC) concatenated with space time block code (STBC) using MSD-1 at the receiver for improving system performance. The system gains have been verified with channel state information (CSI) errors.

Keywords: Channel State Information , Diversity, Multi-Antenna, Rotated Constellation, Space Time Codes.

Digital Object Identifier (DOI):

Procedia APA BibTeX Chicago EndNote Harvard JSON MLA RIS XML ISO 690 PDF Downloads 1448


[1] L. Zheng and Dravd N.C. Tse, "Diversity and Multiplexing : A Fundamental Trade off in Multiple - Antenna Channels", IEEE Transactions on Information theory, Vol 49, No. 5, May 2003.
[2] S.M. Alamouti, "A simple transmit diversity technique for Wireless communications", IEEE Journal on Selected in Areas Communications, vol. 16, pp. 1451-1458, Oct. 1998.
[3] . V. Tarokh, H. Jafarkhani, and A.R. Calderbank, "Space-time block codes from orthogonal designs", IEEE Transactions on Information Theory, vol. 45, pp. 1456-1466, July 1999
[4] V. Tarokh, N. Seshadri and A. Calderbank, "Space-time codes for high data rate wireless communications: Performance criterion and code construction", IEEE Transactions on Information Theory, vol. 44, pp. 744-765, Mar. 1998.
[5] E. Viterbo and J Boutros, "A Universal Lattice Code Decoder for Fading Channels", IEEE Transactions on Information Theory, Vol. 45, No. 5, July, 1999 pp 1639-1642.
[6] M.O. Damen, A. Chkeif "Lattice Code Decoder for Space - Time Codes", IEEE Communications Letters, Vol. 4, No. 5, May 2000, pp 161-163.
[7] X. Zhu and R.D. Murch, "Performance analysis of maximum likelihood detection in a MIMO antenna system", IEEE Transactions on Communications, vol. 50, pp. 187-191, Feb 2002.
[8] J H. Conway and N. J Sloane, Sphere Packings, Lattices and groups, 2nd ed. New York: Springer-Verlag, 1993.
[9] G.D. Forney Jr., "A bounded distance decoding algorithm for the Leech Lattice with generalization", IEEE Transactions on Information Theory, vol. 35, pp. 906-909, July 1989.
[10] J.Yang and Monisha Ghosh, "A simplified Design for MIMO System with Symbol spreading", IEEE Communications Society, 2007.
[11] Anshul Tyagi and Ranjan Bose, "A new distance notion for PPAM Space Time Trellis Codes for UWB MIMO Communications", IEEE Communication Society, 2007.
[12] S.M Razavizadeh, V T T Vakili, "A New faster Sphere Decoder for MIMO Systems". Proceedings of the 3rd IEEE International Symposium on Signal Processing and Information Technology, pp.86- 89, 2003.
[13] Y. Li and P.Y Kam, "Performance analysis of space time codes over rapid Rayleigh fading channels with channel estimation", in Proc. VTC, Sep 2005, Vol. 1 pp. 497-501.