On the Energy Efficiency–Spectral Efficiency Tradeoff in Random Beamforming
On the Energy Efficiency–Spectral Efficiency Tradeoff in Random Beamforming
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DOI：
10.1109/lwc.2014.2339219
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发表时间：
2014-07
影响因子：
6.3
通讯作者：
Yi Huang;Ling Qiu
中科院分区：
文献类型：
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作者：
Yi Huang;Ling Qiu
能量效率（EE）和频谱效率（SE）是无线系统中最重要的度量之一。近年来，EE和SE之间的关系引起了越来越多的关注。在这封信中，我们推导出一个封闭的形式近似的EE-SE权衡在一个现实的功耗模型下的多天线随机波束形成系统。基于EE-SE的近似权衡，借助Lambert W函数以封闭形式获得了EE最大SE和相应的发射功率。我们还推导出最佳的发射天线的数量，以最大化EE时，SE的值是给定的。这些结果有助于获得选择适当系统参数的分析见解，例如，发射功率和发射天线数，以满足绿色通信的需求。仿真结果验证了我们提出的封闭形式近似的准确性。
Energy efficiency (EE) and spectral efficiency (SE) are among the most important metrics in wireless systems. The relationship between EE and SE has attracted more attention recently. In this letter, we derive a closed-form approximation of the EE-SE tradeoff in a multi-antenna random beamforming system under a realistic power consumption model. Based on the approximate EE-SE tradeoff, the EE-maximum SE and the corresponding transmit power are obtained in closed form with the help of Lambert W function. We also derive the optimal number of transmit antennas to maximize the EE when the value of SE is given. These results are helpful to gain analytical insights on choosing proper system parameters, e.g., the transmit power and the number of transmit antennas, to meet the demand of green communication. Simulation results validate the accuracy of our proposed closed-form approximation.