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Optimal power allocation for homogeneous and heterogeneous CA-MIMO systems

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Abstract

Carrier aggregation (CA) technique has been adopted by 3GPP LTE-Advanced due to its ability of enhancing the spectrum efficiency and peak data rates through aggregating multiple component carriers (CCs). Two main factors make power control optimization very essential for CA-MIMO radio link: the different channel characteristics in multiple CCs, and multiple power constraint conditions (per-CC, per-antenna and pertransmitter power constraints) in the actual CA system deployment. This paper firstly derives the degenerate conditions of optimal power allocation for a single-transmitter CA-MIMO system. Stemming from the derived degenerate conditions, we propose a modified hybrid gradient optimal power allocation(MHGOPA) algorithm to maximize the system performance. Simulation results verify the validity of the proposed resource allocation approach by comparing with baseline average power allocation algorithm. Finally, we extend the MHGOPA algorithm into a heterogeneous CA network with multiple transmitters working simultaneously.

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Authors and Affiliations

  1. Key Laboratory of Universal Wireless Communications, Beijing University of Posts and Telecommunications, Beijing, 100876, China

    QiMei Cui, PeiChuan Kang & XueQing Huang

  2. Department of Communications Engineering, Tampere University of Technology, Tampere, 33720, Finland

    Mikko Valkama & Jarno Niemela

Authors
  1. QiMei Cui
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  2. PeiChuan Kang
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  3. XueQing Huang
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  4. Mikko Valkama
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  5. Jarno Niemela
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Correspondence to QiMei Cui.

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Cui, Q., Kang, P., Huang, X. et al. Optimal power allocation for homogeneous and heterogeneous CA-MIMO systems. Sci. China Inf. Sci. 56, 1–14 (2013). https://doi.org/10.1007/s11432-012-4775-4

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  • DOI: https://doi.org/10.1007/s11432-012-4775-4

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