Wireless Power Transfer in Massive MIMO Aided HetNets with User Association
Yongxu Zhu, Lifeng Wang, Kai-Kit Wong, Shi Jin, and Zhongbin Zheng

TL;DR
This paper investigates wireless power transfer in massive MIMO aided HetNets, analyzing user association schemes and deriving expressions for energy harvesting and uplink rate improvements.
Contribution
It introduces a new analysis of user association in massive MIMO HetNets and derives exact and asymptotic energy harvesting and uplink rate expressions.
Findings
Derived exact and asymptotic harvested energy expressions.
Compared user association schemes for energy transfer efficiency.
Analyzed uplink achievable rate under energy harvesting constraints.
Abstract
This paper explores the potential of wireless power transfer (WPT) in massive multiple input multiple output (MIMO) aided heterogeneous networks (HetNets), where massive MIMO is applied in the macrocells, and users aim to harvest as much energy as possible and reduce the uplink path loss for enhancing their information transfer. By addressing the impact of massive MIMO on the user association, we compare and analyze two user association schemes. We adopt the linear maximal ratio transmission beam-forming for massive MIMO power transfer to recharge users. By deriving new statistical properties, we obtain the exact and asymptotic expressions for the average harvested energy. Then we derive the average uplink achievable rate under the harvested energy constraint.
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