Optimal energy efficient joint power allocation for two‐hop single‐antenna relaying systems
Optimal energy efficient joint power allocation for two‐hop single‐antenna relaying systems
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DOI：
10.1002/ett.2842
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发表时间：
2014-07
影响因子：
3.6
通讯作者：
Chunguo Li;J. Cioffi;Luxi Yang
中科院分区：
文献类型：
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作者：
Chunguo Li;J. Cioffi;Luxi Yang
本文从能量效率的角度研究了绿色双跳单天线中继系统中的源-中继源联合功率分配问题。通过考虑实际的功率消耗模型，在保证所需的频谱效率的情况下，以最大化能量效率为基础，以解析表达式的形式导出了源和中继器的最优发射功率。这项工作的新奇之处在于，通过利用Lambert函数的性质刻意地操纵拉格朗日函数，解决了高度复杂的优化问题。结果表明，最优的中继源功率比与瞬时两跳信道增益比是自适应的。数值仿真结果表明了该方案的有效性。版权所有©2014 John Wiley&Sons，Ltd.
In this paper, the joint source‐relay power allocation issue in green dual‐hop single‐antenna relaying systems is investigated from the energy efficiency point of view. By considering a practical power consumption model, the optimal transmit power of the source and that of the relay are derived in the form of analytical expressions based on the maximisation of energy efficiency with a guarantee of the required spectral efficiency. The novelty of the work lies in that the highly complicated optimisation problem is solved by deliberately manipulating the Lagrangian function using the properties of the Lambert function. It is shown that the optimal relay‐to‐source power ratio is adaptive to the ratio of the instantaneous two‐hop channel gains. Numerical simulations have illustrated the effectiveness of our proposed scheme. Copyright © 2014 John Wiley & Sons, Ltd.