Optimal Power Allocation Scheme for Downlink CoMP Systems


Coordinated multi-point transmission and reception (CoMP) scheme enable LTE-Advanced systems to achieve their higher spectral efficiency. Allowing base stations to cooperate one another is one of the solutions to mitigate the inter-cell interference (ICI). In this paper, we propose an iterative power allocation scheme with MMSE procoding based on a modified water-filling for downlink CoMP systems, which achieves the optimal performance. The simulation results show that our proposed system can achieve its optimal rate according to its antenna configuration. Comparing them with a block diagonalization (BD) shows the advantages of MMSE precoding, in particular at a low SNR region.

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J. Li, H. Hai, Y. Guo and M. Lee, "Optimal Power Allocation Scheme for Downlink CoMP Systems," Communications and Network, Vol. 5 No. 2B, 2013, pp. 15-19. doi: 10.4236/cn.2013.52B003.

Conflicts of Interest

The authors declare no conflicts of interest.


[1] M. Sawahashi, Y. Kishiyama, A. Morimoto, M. Nishika-wa and D. Tanno, “Coordinated Multipoint Transmission/Reception Techniques for Ite-advanced,” IEEE Wireless Communications, Vol. 17, No. 3, 2010, pp. 26-34. doi.org/10.1109/MWC.2010.5490976
[2] D. Samardzija and H. Huang, “Determining Backhaul Bandwidth Requirements for Network MIMO,” 17th European Signal Processing Conference (EUSIPCO 2009), Glasgow, Scotland, 2009, pp. 1494-1498.
[3] W. Choi and J. G. Andrews, “The Capacity Gain from Intercell Scheduling in Multi-antenna Systems,” IEEE Transactions on Wireless Communication, Vol. 7, No. 2, 2008, pp. 714-725. doi:10.1109/TWC.2008.060615
[4] T. Ren and R. J. La, “Downlink Beamforming Algorithms with Intercell Interference in Cellular Networks,” IEEE Transactions on Wireles Communincation, Vol. 5, No.10,2006,pp.2814-2823.doi:10.1109/TWC.2006.04580
[5] S. G. Kiani and D. Gesbert, “Optimal and Distributed Scheduling for Multicell Capacity Maximization,” IEEE Transactions on Wireless Communication, Vol. 7, No. 1, 2008, pp. 288-297. doi:10.1109/TWC.2008.060503
[6] S. Shamai (Shitz) and B. M. Zaidel, “Enhancing the Cellular Downlink Capacity via Coprocessing at the Transmitting End,” IEEE Vehicular Technology Conference (VTC2001-Spring), Rhodes, Greece, 2001, pp. 1745- 1749.
[7] Q. H. Spencer, A. L. Swindlehurst and M. Haardt, “Zero-Forcing Methods for Downlink Spatial Multiplexing in Multiuser MIMO Channels,” IEEE Transactions on Signal Processing, Vol. 52, No. 2, 2004, pp. 461-471. doi:10.1109/TSP.2003.821107
[8] J. Zhang, R. Chen, J. G. Andrews, A. Ghosh, and R. W. Heath, “Networked MIMO with Clustered Linear Precoding,” IEEE Transac-tions on Wireless Communications, Vol. 8, No. 4, 2009, pp. 1910-1921. doi:10.1109/TWC.2009.080180
[9] E. Bjornson, R. Zakhour, D. Gesbert and B. Ottersten, “Distributed Multicell and Multiantenna Precoding: Characterization and Performance Evaluation,” IEEE Global Communications Conference (GLOBECOM 2009), Hawaii, U.S.A, 2009, pp. 1-6.
[10] R. S. Cheng and S. Verdu, “Gaussian Multiaccess Channels with ISI: Capacity Region and Multiuser Water-filling,” IEEE Transactions on Information Theory, Vol. 39, No. 3, 1993, pp. 773-785. doi:10.1109/18.256487
[11] A. Garcîa Armada, M. Sanchez Fernandez and R. Corvaja, “Waterfilling Schemes for Zero-Forcing Coordinated Base Station Transmission,” IEEE Global Communications Conference (GLOBECOM 2009), Hawaii, U.S.A, 2009.
[12] J. M. Cioffi, “Advanced Digital Communications, EE379c,” Stanford University Course Notes. http://www.stanford.edu/class/ee379c.
[13] G. J. Foschini, K. Karakayali and R. A. Valenzuela, “Coordinating Multiple Antenna Cellular Networks to Achieve Enormous Spectral Efficiency,” IEEE Proceedings Communications, Vol. 153, No. 4, 2006, pp. 548-555.

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