Use of cell-site diversity in millimeter-wave fixed cellular systems to combat the effects of rain attenuation
- 7 August 2002
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Journal on Selected Areas in Communications
- Vol. 20 (3), 602-614
- https://doi.org/10.1109/49.995519
Abstract
An examination of potential advantages of cell-site diversity with selection combining in the context of MM-wave fixed cellular systems is reported. The study involves simulation of converging radio links over weather radar images of the radar reflectivity factor, from which the specific attenuation of rain at 30 GHz is derived. The average correlation of attenuation on two converging links as a function of their angular separation is shown to indicate the potential benefits in the use of cell-site diversity, especially in heavy rain. Results show that diversity gain exhibits a dependence on angular separation /spl theta/ in the general form of sin/sup k/ (/spl theta//2). For links of identical lengths the model reduces to a root-sinusoidal shape (k=0.5), whereas links of unequal lengths lead to the ITU-R recommended model (k=1). Based on the sin/sup k/ (/spl theta//2) model and observation of the length ratio of the links, a set of criteria for determining the benefit of cell-site diversity for a given subscriber location is proposed.Keywords
This publication has 3 references indexed in Scilit:
- Microwave Mobile CommunicationsPublished by Institute of Electrical and Electronics Engineers (IEEE) ,1994
- Nonlinear RegressionWiley Series in Probability and Statistics, 1989
- Macroscopic diversity performance measured in the 800-MHz portable radio communications environmentIEEE Transactions on Antennas and Propagation, 1988