Statistical Modeling at 18 GHz Using of Broadband Wireless LAN Channels Directive Antennas

Abstract

Measurements of indoor radio channels in thefrequency domain were carried out in acommunicationslaboratoryat 18-19 GHz using directiveantennas of beamwidths equal to 25 V × 53 H.Statistical modeling of the channel parameters wasderived from 800 data profiles. The main resultsobtained are: (1) The arrival times of the multipathcomponents have a clustering property, with itsstatistical distribution fitting very well to themodified Poisson process; (2) the amplitudes of themultipath components and the mid-scale power attenuationobey the log-normal distribution; (3) the power decreasewith the antenna separation exponentially, with theexponent around 1.9 for Line-of-Sight (LOS) locations,2.7 for non-line-of-sight (NLOS) locations, and 2.2 forboth LOS and NLOS locations; (4) the RMS Dels are generally quite small, with a global meanvalue of 4.8 ns, and standard deviation value of 5.3 ns.Its statistical distribution was found to follow thenormal distribution for the same antenna separation aswell as for all the measurement data with differentantenna separations; (5) the RMS delay spread isinversely proportional to the channel coherencebandwidth, with the proportional coefficient greater forLOS data than for NLOS data, and also decaying with theincrement of antenna separations.