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Joint Optimization of User Set Selection and Transmit Power Allocation for Orthogonal Random Beamforming in Multiuser MIMO Systems

  • Received : 2012.03.07
  • Accepted : 2012.05.14
  • Published : 2012.12.31

Abstract

When the number of users is finite, the performance improvement of the orthogonal random beamforming (ORBF) scheme is limited in high signal-to-noise ratio regions. In this paper, to improve the performance of the ORBF scheme, the user set and transmit power allocation are jointly determined to maximize sum rate under the total transmit power constraint. First, the transmit power allocation problem is expressed as a function of a given user set. Based on this expression, the optimal user set with the maximum sum rate is determined. The suboptimal procedure is also presented to reduce the computational complexity, which separates the user set selection procedure and transmit power allocation procedure.

References

  1. M. Costa, "Writing on Dirty Paper," IEEE Trans. Info. Theory, vol. 29, May 1983, pp. 439-441. https://doi.org/10.1109/TIT.1983.1056659
  2. G. Caire and S. Shamai, "On the Achievable Throughput of a Multi-antenna Gaussian Broadcast Channel," IEEE Trans. Info. Theory, vol. 49, July 2003, pp. 1691-1706. https://doi.org/10.1109/TIT.2003.813523
  3. T. Yoo and A. Goldsmith, "On the Optimality of Multiantenna Broadcast Scheduling Using Zero-Forcing Beamforming," IEEE J. Sel. Areas Commun., vol. 24, Mar. 2006, pp. 528-541. https://doi.org/10.1109/JSAC.2005.862421
  4. P. Viswanath, D. Tae, and R. Laroia, "Opportunistic Beamforming Using Dumb Antennas," IEEE Trans. Info. Theory, vol. 48, June 2002, pp. 1277-1294. https://doi.org/10.1109/TIT.2002.1003822
  5. I. Kim et al., "Opportunistic Beamforming Based on Multiple Weighting Vectors," IEEE Trans. Wireless Commun., vol. 4, Nov. 2005, pp. 2683-2687. https://doi.org/10.1109/TWC.2005.857999
  6. M. Sharif and B. Hassibi, "On the Capacity of MIMO Broadcast Channels with Partial Information," IEEE Trans. Info. Theory, vol. 51, Feb. 2005, pp. 506-522. https://doi.org/10.1109/TIT.2004.840897
  7. J. Jang and K. Lee, "Transmit Power Adaptations for Multiuser OFDM Systems," IEEE J. Sel. Areas Commun., vol. 21, Feb. 2003, pp. 171-178. https://doi.org/10.1109/JSAC.2002.807348
  8. T.L. Marzetta and B.M. Hochwald, "Capacity of a Mobile Multiple-Antenna Communication Link in Rayleigh Flat Fading," IEEE Trans. Info. Theory, vol. 45, Jan. 1999, pp. 138-157.