Adaptive Circuit Power Control for Down-link Massive MIMO Systems

Shanko Chura Aredo, Y. Negash, Y. Wondie, Rajaveerappa Devadas, Feyisa Debo, Mahlet Akalu
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Abstract

Massive MIMO (mMIMO) is a variant of MIMO systems in which hundreds and thousands of miniatured antennas can be installed in a single Base Station (BS) serving a number of single antenna user terminals. As the number of transmit antennas (M) equivalently increases with the number of RF chains associated with each antenna elements especially in digital beamforming, the chain exhibits substantial amount of power consumption accordingly. Hence, to alleviate such problems, one of the potential solutions is to reduce the number of RFs or to minimize their power consumption. In this paper, low resolution DAC with hybrid precoder is used for reducing the total power consumption in order to achieve energy efficient downlink mMIMO. The simulation results show that, the power consumption overhead reduces with low DAC resolution and the system achieves more energy and spectral efficiency relative to without DAC resolution. Moreover, considering a given number of users, we compared energy and SE with and without resolution. Finally, the trade-off between EE and SE is analysed for both conditions and has been shown that EE with more resolution surpasses that of with low and without resolution.
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下行链路大规模MIMO系统的自适应电路功率控制
大规模MIMO (mMIMO)是MIMO系统的一种变体,其中可以在单个基站(BS)中安装成百上千个微型天线,为多个单天线用户终端提供服务。由于发射天线的数量(M)与与每个天线元件相关的射频链的数量等同增加,特别是在数字波束形成中,该链相应地显示出大量的功耗。因此,为了缓解此类问题,一个潜在的解决方案是减少rf的数量或使其功耗最小化。为了实现高效节能的下行mimo,本文采用了带混合预编码器的低分辨率DAC来降低总功耗。仿真结果表明,较低的DAC分辨率降低了系统的功耗开销,相对于没有DAC分辨率,系统获得了更高的能量和频谱效率。此外,考虑到给定的用户数量,我们比较了有和没有分辨率的能量和SE。最后,对两种情况下的EE和SE之间的权衡进行了分析,结果表明,高分辨率的EE优于低分辨率和无分辨率的EE。
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