Power allocation for multiple spectrum sharing networks

Central Publication

• Ran Cai, Jian-Kang Zhang, Timothy N. Davidson, Wei Zhang, K. Max Wong and P. C. Ching
  A power allocation strategy for multiple Poisson spectrum sharing networks
  IEEE Transactions on Wireless Communications,
  14(4):1785-1799, April 2015.

Abstract

• This paper develops a power allocation strategy for multiple networks of Poisson-distributed single antenna nodes that share the available spectrum in a spectrum underlay scenario. This strategy aims to maximize the overall throughput obtained by sharing the spectrum while limiting the degradation of the successful transmission probability of each network. In its original form, this joint power allocation problem is difficult to solve. However, we demonstrate that the problem can be transformed into a convex optimization formulation, which can be efficiently solved. Furthermore, we obtain a quasi-closed form solution that has a water-filling interpretation by analyzing the optimality conditions. Numerical results indicate that when a spectrum sharing scheme employs the proposed optimal strategy of power allocation, throughput improves substantially over that obtained by allocating the spectrum exclusively to the primary network. Moreover, when the number of spectrum sharing networks increases, the enhancement is significant, being up to the limit imposed by the maximum allowable degradation in the performance of each network.

Paper

• The paper is available on IEEEXplore: http://doi.org/10.1109/TWC.2014.2372772.

Additional References

• A preliminary version of this work appears in
  • R. Cai, J.-K. Zhang, T. N. Davidson, K. M. Wong, and P.-C. Ching. Power control for multiple spectrum-sharing networks under random geometric topologies. In Proceedings of the IEEE International Conference on Acoustics, Speech and Signal Processing, pages 4809-4813, Vancouver, May 2013. (pdf file).

• Further stochastic geometry analysis of networks that employ partial zero-forcing beamforming appears in:
  • R. Cai, W. Zhang, P.-C. Ching, T. N. Davidson and J.-K. Zhang. Performance of partial zero-forcing beamforming in large random spectrum sharing networks. In Proceedings of the 2014 IEEE International Conference on Acoustics, Speech and Signal Processing, pages 7039-7043, Florence, May 2014. http://doi.org/10.1109/ICASSP.2014.6854955

  • R. Cai, P.-C. Ching and T. N. Davidson. Tradeoff analysis of partial zero-forcing beamforing in large random spectrum sharing networks. In Proceedings of the 2014 IEEE International Workshop on Signal Processing Advances in Wireless Communications, pages 75-79, Toronto, June 2014. http://doi.org/10.1109/SPAWC.2014.6941320

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