Measurements and models for 38-GHz point-to-multipoint radiowavepropagation

摘要

This article presents results of a wide-band measurement campaignnconducted at 38 GHz. The objective of the research was to determinenmultipath and time varying channel behavior of short-hop millimeter-wavenpoint-to-multipoint radio links during various weather events. 73963npower delay profiles (PDPs) were captured on three links, eachncomparable to proposed local multipoint distribution systems (LMDS) in ancampus environment. Multipath was observed in unobstructed LOS linksnduring rain but not during clear weather. Short-term variation of thenreceived signal over 1-2 min observation periods is described by anRician distribution with a K factor which varies as a function of rainnrate. Measured rain attenuation exceeds Crane's (1996) model predictionsnby several decibels. A novel prediction technique is presented thatnapplies canonical antenna patterns and site specific information tonestimate worst case multipath channel characteristics including relativenpower, time of arrival (TOA), and angle of arrival (AOA) of eachnmultipath component. New metrics, the excess delay zone and relativenpower zone, are defined and contour plots are developed to determinenpotential reflectors from an area site map. These results and modelsnprovide useful guidelines for the design of millimeter-wave wirelessncommunication systems