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 user association schemes: 1) downlink received signal power (DRSP) based approach for maximizing the harvested energy; and 2) uplink received signal power (URSP) based approach for minimizing the uplink path loss. We adopt the linear maximalratio transmission (MRT) beamforming 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. Numerical results demonstrate that the use of massive MIMO antennas can improve both the users' harvested energy and uplink achievable rate in the HetNets, however, it has negligible effect on the ambient RF energy harvesting. Serving more users in the massive MIMO macrocells will deteriorate the uplink information transfer because of less harvested energy and more uplink interference. Moreover, although DRSP-based user association harvests more energy to provide larger uplink transmit power than the URSP-based one in the massive MIMO HetNets, URSPbased user association could achieve better performance in the uplink information transmission. Energy harvesting, heterogeneous network (HetNet), massive MIMO, user association, wireless power transfer.
Reference REF addresses the impact of massive MIMO on the user association in massive multiple-input multiple-output (MIMO)-aided heterogeneous networks (HetNets) embedded wireless power transfer (WPT).
Wireless Power Transfer in Massive MIMO Aided HetNets with User Association
IEEE Transactions on Communications
IEEE Transactions on Communications
Computer Science Mathematics