Millimeter Wave Wireless Communications: New Results for Rural   Connectivity
  This paper shows the remarkable distances that can be achieved using millimeter wave communications, and presents a new rural macrocell (RMa) path loss model for millimeter wave frequencies, based on measurements at 73 GHz in rural Virginia. Path loss models are needed to estimate signal coverage and interference for wireless network design, yet little is known about rural propagation at millimeter waves. This work identifies problems with the RMa model used by the 3rd Generation Partnership Project (3GPP) TR 38.900 Release 14, and offers a close-in (CI) reference distance model that has improved accuracy, fewer parameters, and better stability as compared with the existing 3GPP RMa path loss model. The measurements and models presented here are the first to validate rural millimeter wave path loss models. 
George R. MacCartney Jr., Shu Sun, Theodore S. Rappaport, Yunchou   Xing, Hangsong Yan, Jeton Koka, Ruichen Wang, and Dian Yu
cs.IT math.IT