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The Downlink Capacity of Single-User SA-MIMO System

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Abstract

In this paper, a novel multiple antenna system framework, which combines smart antennas (SA) with multiple-input-multiple-output (MIMO) at the transmitter, is proposed. The downlink capacity of the single-user SA-MIMO wireless systems is investigated. The joint optimization problem corresponding to the capacity is deduced. After that, upper bounds of the capacity are given in general case and in the case of equal power allocation, respectively. Furthermore, in the case of equal power allocation and the same direction of departure from one transmit smart antenna to all antenna arrays at the receiver the closed-form expression of the capacity is obtained. Some numerical results are given to show that smart antennas can bring significant capacity gain for the MIMO systems due to the smart antennas gain, without additional spatial degrees of freedom, especially at high SNR with strong correlation among the MIMO channel links or at low SNR.

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Authors and Affiliations

  1. National Mobile Communications Research Laboratory, Southeast University, Nanjing, 210096, China

    Jianxin Dai & Ming Chen

  2. School of Science, Nanjing University of Posts and Telecommunications, Nanjing, 210046, China

    Jianxin Dai

  3. Institute for Digital Communications, School of Engineering, The University of Edinburgh, Edinburgh, Scotland, UK

    Pei-Jung Chung

Authors
  1. Jianxin Dai
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  2. Ming Chen
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  3. Pei-Jung Chung
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Correspondence to Jianxin Dai.

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Dai, J., Chen, M. & Chung, PJ. The Downlink Capacity of Single-User SA-MIMO System. Wireless Pers Commun 69, 1333–1345 (2013). https://doi.org/10.1007/s11277-012-0636-0

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  • DOI: https://doi.org/10.1007/s11277-012-0636-0

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