Open AccessDirectional channel modelling for millimetre wave communications in urban areas
Author(s) -
Torabi Amir,
Zekavat Seyed Alireza
Publication year - 2018
Publication title -
iet communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.355
H-Index - 62
eISSN - 1751-8636
pISSN - 1751-8628
DOI - 10.1049/iet-com.2017.0868
Subject(s) - non line of sight propagation , ray tracing (physics) , path loss , computer science , extremely high frequency , antenna diversity , channel (broadcasting) , coherence time , telecommunications , physical optics , antenna height considerations , coherence (philosophical gambling strategy) , delay spread , geometrical optics , optics , antenna (radio) , physics , fading , wireless , quantum mechanics
Integrating Kirchhoff approximation (KA) and a ray‐tracing (RT) algorithm, this study develops a new directional three‐dimensional channel model for urban millimetre‐wave small cells. The authors study the path loss, spatial correlation, coverage distance, and coherence length for line‐of‐sight (LOS), obstructed LOS, and non‐LOS (NLOS) scenarios in urban areas. Exploiting physical optics and geometric optics solutions, closed‐form expressions for spatial correlation are derived. It is deduced that LOS availability, frequency, and surface roughness scale highly impact spatial diversity. In addition, using antenna arrays of moderate gain at both sides of the link, even under NLOS conditions, a typical urban cell size of 200 m is achievable.