研究目的
To propose downlink power control algorithms aimed at maximizing the global energy efficiency in wireless cellular systems operating at millimeter wave frequencies, comparing cell-free and user-centric approaches.
研究成果
The proposed power control algorithm provides better performance than uniform power allocation, with the user-centric approach generally outperforming the cell-free one. The results serve as a baseline for future work on cell-free and user-centric massive MIMO at mmWave frequencies.
研究不足
The study assumes a simplified beamforming structure at the MSs and does not consider more sophisticated channel estimation schemes. The optimization is based on estimated channels in the imperfect CSI case, which may not always lead to better performance than uniform power allocation.
1：Experimental Design and Method Selection:
The study employs sequential and alternating optimization to tackle the non-convexity of the problems, considering hybrid analog/digital beamformers.
2：Sample Selection and Data Sources:
The scenario involves an area with K MSs and M APs randomly located, operating at a carrier frequency of 73 GHz.
3：List of Experimental Equipment and Materials:
APs equipped with NAP = 16 antennas each and MSs with NM S = 8 antennas each, with a multiplexing order of P =
4：Experimental Procedures and Operational Workflow:
The communication protocol includes uplink training, downlink data transmission, and uplink data transmission, with power control algorithms applied.
5：Data Analysis Methods:
The ASE for the k-th user is calculated, and the GEE is maximized using the proposed optimization procedure.
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