On the energy efficiency gain of MIMO communication under various power consumption models
On the energy efficiency gain of MIMO communication under various power consumption models
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发表时间：
2011-06
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通讯作者：
F. Héliot;M. Imran;R. Tafazolli
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作者：
F. Héliot;M. Imran;R. Tafazolli
与频谱效率（SE）一起，能效（EE）正成为通信领域主要的性能评价标准之一。这两个相互冲突的标准可以通过它们的权衡联系起来。就MIMO而言，最近提出了一种EE- se权衡的封闭近似，它被证明对分析使用多天线对EE的影响很有用。在本文中，我们使用这种封闭形式的近似来评估和比较在发射机考虑不同功耗模型（pcm）时，MIMO在SISO系统上的EE增益。通信系统的EE与其功耗密切相关。理论上，只有发射功率被认为是消耗的功率，而在实际设置中，消耗的功率是两个项的相加；固定消耗功率，用于冷却、加工等；可变消耗功率，作为发射功率的函数而变化。我们的分析揭示了SISO系统上MIMO的理论和实际EE增益之间的巨大不匹配；理论上，EE增益随着SE和天线数量的增加而增加，因此，与SISO相比，MIMO在EE改善方面的潜力非常大；相反，当考虑实际的pcm时，EE增益很小，并且随着发射天线数量的增加而减小。
Along with spectral efficiency (SE), Energy efficiency (EE) is becoming one of the main performance evaluation criteria in communication. These two criteria, which are conflicting, can be linked through their trade-off. As far as MIMO is concerned, a closed-form approximation of the EE-SE trade-off has recently been proposed and it proved useful for analyzing the impact of using multiple antennas on the EE. In this paper, we use this closed-form approximation for assessing and comparing the EE gain of MIMO over SISO system when different power consumption models (PCMs) are considered at the transmitter. The EE of a communication system is closely related to its power consumption. In theory only the transmit power is considered as consumed power, whereas in a practical setting, the consumed power is the addition of two terms; the fixed consumed power, which accounts for cooling, processing, etc., and the variable consumed power, which varies as a function of the transmit power. Our analysis unveils the large mismatch between theoretical and practical EE gain of MIMO over SISO system; In theory, the EE gain increases both with the SE and the number of antennas, and, hence the potential of MIMO for EE improvement is very large in comparison with SISO; On the contrary, the EE gain is small and decreases as the number of transmit antennas increases when realistic PCMs are considered.