Analysis of UAV Communications in Cell-Free Massive MIMO systems

Autor:	D'Andrea, Carmen, Garcia-Rodriguez, Adrian, Geraci, Giovanni, Giordano, Lorenzo Galati, Buzzi, Stefano
Rok vydání:	2019
Předmět:	Computer Science - Information Theory Electrical Engineering and Systems Science - Signal Processing
Druh dokumentu:	Working Paper
Popis:	We study support for unmanned aerial vehicle (UAV) communications through a cell-free massive MIMO architecture, wherein a large number of access points (APs) is deployed in place of large co-located massive MIMO arrays. We consider also a variation of the pure cell-free architecture by applying a user-centric association approach, where each user is served only from a subset of APs in the network. Under the general assumption that the propagation channel between the mobile stations, either UAVs or ground users (GUEs), and the APs follows a Ricean distribution, we derive closed-form spectral efficiency lower bounds for uplink and downlink with linear minimum mean square error channel estimation. We consider several power allocation and user scheduling strategies for such a system, and, among these, also minimum-rate maximizing power allocation strategies to improve the system fairness. Our numerical results reveal that cell-free massive MIMO architecture and its low-complexity user-centric alternative may provide better performance than a traditional multi-cell massive MIMO network deployment. Comment: double-column, 14 pages, 8 figure, journal paper
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/1909.02485 Zobrazit plný text záznamu View this record from Arxiv