Energy efficiency enhancement of cell‐free massive multiple‐input multiple‐output network employing threshold‐based beamforming,Transactions on Emerging Telecommunications Technologies

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Energy efficiency enhancement of cell‐free massive multiple‐input multiple‐output network employing threshold‐based beamforming
Transactions on Emerging Telecommunications Technologies ( IF 2.5 ) Pub Date : 2020-06-15 , DOI: 10.1002/ett.4007
Zeynab Khodkar ₁ , Jamshid Abouei ₁

Affiliation

The downlink of cell‐free massive multiple‐input multiple‐output network is considered. It is assumed that both access points (APs) and users are equipped with multiple antennas. A heuristic threshold‐based‐beamforming (TBF) protocol is proposed, which performs an AP selection algorithm to significantly improve the total energy efficiency (EE) of the network. The beamforming method that fits the model is the maximum eigenmode beamforming (MEB). The threshold level is determined in such a way that the strongest channel eigenmodes contribute in the downlink transmissions. Indeed, power control coefficients are chosen in such a way that the number of users served by each AP is limited according to the TBF‐based AP selection scheme. The spectral efficiency of the proposed method is investigated considering both perfect and imperfect knowledge of the channel state information at transmitters. Simulation results show that the proposed TBF protocol greatly enhances the total EE of the network compared to the MEB, conjugate beamforming, and zero‐force precoding techniques. Furthermore, a modification algorithm is proposed to obtain the minimum per‐user quality of service requirement, which prevents the dramatic reduction in the EE caused by high inter‐user interference levels.

中文翻译：

采用基于阈值的波束成形技术增强无单元大规模多输入多输出网络的能效

考虑无小区大规模多输入多输出网络的下行链路。假定接入点（AP）和用户都配备了多个天线。提出了一种启发式的基于阈值的波束形成（TBF）协议，该协议执行AP选择算法以显着提高网络的总能效（EE）。适合模型的波束成形方法是最大本征模波束成形（MEB）。以使得最强的信道本征模式有助于下行链路传输的方式来确定阈值水平。实际上，以基于TBF的AP选择方案来限制每个AP服务的用户数量的方式选择功率控制系数。考虑到在发射机处的信道状态信息的完善和不完善的知识，研究了所提出方法的频谱效率。仿真结果表明，与MEB，共轭波束形成和零力预编码技术相比，所提出的TBF协议大大提高了网络的总EE。此外，提出了一种修改算法，以获得最低的每用户服务质量要求，从而防止了由于用户间高干扰水平而导致的EE急剧下降。

更新日期：2020-06-15

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