Energy Efficient Pilot and Link Adaptation for Mobile Users in TDD Multi-User MIMO Systems
Energy Efficient Pilot and Link Adaptation for Mobile Users in TDD Multi-User MIMO Systems
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DOI：
10.1109/twc.2013.120113.130677
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发表时间：
2014
影响因子：
10.4
通讯作者：
Yunesung Kim;Guowang Miao;T. Hwang
中科院分区：
文献类型：
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作者：
Yunesung Kim;Guowang Miao;T. Hwang
在本文中，我们开发了一种上行链路导频和下行链路自适应方法，以提高能量效率（EE）的移动的用户在时分双工（TDD）多用户多输入多输出（MU-MIMO）系统。假设上行链路和下行链路信道之间具有互惠性，则下行链路传输基于上行链路信道估计。虽然更多的上行链路导频功率确保更准确的信道估计和更好的下行链路性能，但它会导致移动的用户的更高的能量消耗。本文揭示了导频功率，信道估计和下行链路自适应之间的关系和权衡，以达到最高的能量效率为移动的用户。我们表明，不同用户的能量效率可以解耦，因为每个用户的下行链路平均吞吐量是独立于其他用户的导频功率和节能设计可以在每个用户的基础上进行。在此基础上，提出了一种上行导频和下行链路自适应算法，以提高移动的用户的EE。最后提供的仿真结果证明了移动的用户的能量效率的显着增益。
In this paper, we develop an uplink pilot and downlink link adaptation approach to improve the energy efficiency (EE) of mobile users in time division duplexing (TDD) multi-user multiple input and multiple output (MU-MIMO) systems. Assuming reciprocity between uplink and downlink channels, the downlink transmission is based on uplink channel estimation. While more uplink pilot power ensures more accurate channel estimation and better downlink performance, it incurs higher energy consumption of mobile users. This paper reveals the relationship and tradeoff among pilot power, channel estimation, and downlink link adaptation that achieves the highest energy efficiency for mobile users. We show that the energy efficiency of different users can be decoupled because the downlink average throughput of each user is independent of the pilot powers of other users and energy-efficient design can be done on a per-user basis. Based on the analysis, we propose an uplink pilot and downlink link adaptation algorithm to improve the EE of mobile users. Simulation results are finally provided to demonstrate the significant gain in energy efficiency for mobile users.