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Space Time Coding


Space-Time codes have formed a considerable part of the MIMO research here at MPRG. Ran Gozali’s dissertation [1] focused on the practical implications of using space time trellis codes and space time block codes for high data rate wireless communications. The effect of channel estimation errors, spatially correlated channels and multi-path channels on the performance of these codes was studied ([2] [3] [4] [5] [6] and [7]).


The application of MIMO processing to WLAN systems is discussed in [8]. Decoding algorithms for multi-layered space-time coding systems (a combination of V-BLAST and STBC) is compared in [9].

Research has also been performed on decoding algorithms for a multi-group space time code system. This system combines transmit diversity and special multiplexing over MIMO channels. The decoders are based on multi-user detection techniques ([12],[13]). Work also includes a study  on the sphere decoder for MIMO systems [14].


Presentations 

[A] Space Time Codes

[B] Impact of Channel Estimation Errors on STTC


References 

[1] Gozali, R, Space time codes for high data rate wireless communications,” PhD Dissertation, Virginia Tech, 2002

[2] Gozali, R.; Woerner, B.D, Applying the Calderbank-Mazo algorithm to space-time trellis coding,” Proceedings of the IEEE Southeastcon 2000, 7-9 April 2000 Page(s): 309 -314

[3] Gozali, R.; Woerner, B.D., "The impact of channel estimation errors on space-time trellis codes paired with iterative equalization/decoding," IEEE 55th Vehicular Technology Conference,  Volume: 2 , 6-9 May 2002 Pages:826 - 831

[4] Gozali, R.; Woerner, B.D., "On the robustness of space-time block codes to spatial correlation," IEEE 55th Vehicular Technology Conference, Volume: 2 , 6-9 May 2002, Pages:832 - 836

[5] Gozali, R.; Woerner, B.D., "Upper bounds on the bit-error probability of space-time trellis codes using generating function techniques," IEEE 53rd Vehicular Technology Conference, Volume: 2 , 6-9 May 2001 Pages:1318 - 1323

[6] Buehrer, R.M.; Kumar, N.A., The impact of channel estimation error on space-time block codes,” IEEE 56th Proceedings of Vehicular Technology Conference, Fall. 2002 Volume: 3, 24-28 Sept. 2002 Page(s): 1921 -1925 vol.3

[7] Menon, R, "The Impact of Channel Estimation Errors on STTC", MS Thesis, Virginia Tech,  2003.

[8] Mostafa, R.; Robert, M.; Reed, J.H., "Reduced complexity MIMO processing for WLAN (IEEE 802.11b) applications," Proceedings Radio and Wireless Conference, 2003. Aug. 10-13, Pages:171 - 174

[9] Mohammad, M.; Al-Ghadhban, S.; Woerner, B.; Tranter, W., "Comparing Decoding Algorithms for Multi-Layer Space-Time Block Codes," IEEE SoutheastCon Proceedings, 2004. Pages:147 - 152

[10] Y. Ahmed, R.M. Buehrer, and J.H. Reed, "Space-Time Block Codes for Eight Transmit Antennas ," Asilomar Conference on Signals, Systems and Computers, Nov. 2002.

[11] R. Gozali, R.M. Buehrer and B.D.Woerner, "The Impact of Multiuser Diversity on Space-Time Block Coding," Proceedings of the Fall 2002 Vehicular Technology Conference, Vancouver Canada, Sept. 2002.

[12] Samir[12] Al-Ghadhban and Brain Woerner, "Iterative Joint and Interference Nulling/ Cancellation Decoding Algorithm for Multi-Group Space Time Trellis Coded Systems,” IEEE WCNC 04

[][13] M.  [113]  Mohammad,  S. Al-Ghadhban, B. Woerner, and W. Tranter. “Comparing Decoding Algorithms for Multi-Layer Space-Time Block Codes,” SoutheastCon, 2004.Proceedings. IEEE Pages:147 - 152

[14] Samir[14] Al-Ghadhban and Brian Woerner, “Complexity Study and Application of the Sphere Decoder on MIMO Systems,” May 2004.

 


Mobile & Portable Radio Research Group
Virginia Tech
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