Wireless Personal Communications

, Volume 68, Issue 1, pp 95–113 | Cite as

Optimized Power Allocation for Layered-Steered Space-Time Codes

  • Ahmad S. SalimEmail author
  • Salam A. Zummo
  • Samir N. Al-Ghadhban
  • Ping-Cheng Yeh


Layered Steered Space-Time Codes (LSSTC) is a recently proposed multiple-input multiple-output system that combines the benefits of vertical Bell Labs space-time (VBLAST) scheme, space-time block codes and beamforming. We suggest a new downlink scheme employing LSSTC with asymmetric power allocation, by assuming that the user feeds the BS with the average signal-to-noise ratio per VBLAST layer through the uplink feedback channel. The motivation behind proposing such a system is to enhance the error performance by assigning power to the layers in an optimal manner. We refer to the system proposed as the optimal power allocation LSSTC (OPA-LSSTC). Our analysis is general such that it includes asymmetric layered systems in which each layer may have different number of antennas and also the power can be assigned to layers asymmetrically.


Layered-steered space-time codes LSSTC Performance analysis Optimal power allocation 


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.


  1. 1.
    Wolniansky, P. W., Foschini, G. J., Golden, G. D., & Valenzuela, R. A. (1998). V-BLAST : An architecture for realizing very high data rates over the rich-scattering wireless channel. URSI international symposium on signals, systems and electronics (pp. 295–300).Google Scholar
  2. 2.
    Alamouti S. (1998) A simple transmit diversity technique for wireless communications. Selected Areas in Communications, IEEE Journal on 16(8): 1451–1458CrossRefGoogle Scholar
  3. 3.
    Tarokh V., Naguib A., Seshadri N., Calderbank A. (1999) Combined array processing and space-time coding. Information Theory, IEEE Transactions on 45(4): 1121–1128MathSciNetzbMATHCrossRefGoogle Scholar
  4. 4.
    Mohammad, M., Al-Ghadhban, S., Woerner, B., & Tranter, W. (2004). Comparing decoding algorithms for multi-layered space-time block codes. IEEE SoutheastCon proceedings (pp. 147–152).Google Scholar
  5. 5.
    Chong, J. H., Khatun, S., Noordin, N. K., Ali, B. M., & Syed, M. J. (2008). Joint optimal detection of ordering SIC ZF and SIC ZF MAP for V-BLAST/STBC wireless communication systems. ENICS ’08: proceedings of the international conference on advances in electronics and micro-electronics (pp. 84–89).Google Scholar
  6. 6.
    El-Hajjar M., Hanzo L. (2007) Layered steered space-time codes and their capacity. Electronics Letters 43(12): 680–682CrossRefGoogle Scholar
  7. 7.
    Kostina V., Loyka S. (2008) On optimum power allocation for the V-BLAST. Communications, IEEE Transactions on 56(6): 999–1012CrossRefGoogle Scholar
  8. 8.
    Nam, S. H., & Lee, K. B. (2002). Transmit power allocation for an extended V-BLAST system, 2002. In The 13th IEEE international symposium on personal, indoor and mobile radio communications, 15-18 Sept. 2002 (Vol. 2, pp. 843–848).Google Scholar
  9. 9.
    Chen H.-Y., Chuang C.-H., Yeh P.-C., Zummo S. (2010) Optimal power allocation and power control for VBLAST systems with M-ary modulations. IET Communications 4(8): 956–966MathSciNetCrossRefGoogle Scholar
  10. 10.
    Nam S. H., Shin O.-S., Lee K. B. (2004) Transmit power allocation for a modified V-BLAST system. IEEE Transactions on Communications 52(7): 1074–1079CrossRefGoogle Scholar
  11. 11.
    Wang N., Blostein S. D. (2007) Approximate minimum BER power allocation for MIMO spatial multiplexing systems. IEEE Transactions on Communications 55(1): 180–187CrossRefGoogle Scholar
  12. 12.
    Wang, N., & Blostein, S.D. (2005). Minimum BER transmit optimization for two-input multiple-output spatial multiplexing. In Global telecommunications conference, 2005. GLOBECOM ’05. IEEE (Vol. 6, pp. 3774–3778).Google Scholar
  13. 13.
    Kalbasi R., Falconer D., Banihashemi A. (2005) Optimum power allocation for a v-blast system with two antennas at the transmitter. Communications Letters, IEEE 9(9): 826–828CrossRefGoogle Scholar
  14. 14.
    Proakis J. (2000) Digital communications (4th ed.). McGraw-Hill, New York, USAGoogle Scholar
  15. 15.
    Salim, A. (2010). Performance of layered steered space-time codes in wireless systems, Master’s thesis.Google Scholar
  16. 16.
    Al-Shalan, F. (2000). Performance of quadrature amplitude modulation in Nakagami fading channels with diversity. Ph.D. dissertation, King Fahd University of Petroleum and Minerals, Dhahran, Saudi Arabia.Google Scholar
  17. 17.
    Tao, M., & Cheng, R. (2001). Low complexity post-ordered iterative decoding for generalized layered space-time coding systems. IEEE international conference on communications (Vol. 4, pp. 1137–1141).Google Scholar

Copyright information

© Springer Science+Business Media, LLC. 2011

Authors and Affiliations

  • Ahmad S. Salim
    • 1
    Email author
  • Salam A. Zummo
    • 1
  • Samir N. Al-Ghadhban
    • 1
  • Ping-Cheng Yeh
    • 2
  1. 1.Electrical Engineering DepartmentKing Fahd University of Petroleum and Minerals (KFUPM)DhahranSaudi Arabia
  2. 2.Department of Electrical Engineering and Graduate Institute of Communication EngineeringNational Taiwan UniversityTaipeiTaiwan

Personalised recommendations