Analysis of multipath fading on line-of-sight links in the presence of an elevated atmospheric duct

Author

Mahmoud, S.F. ; Boghdady, H.N. ; El-sayed, O.L.

Author_Institution

Cairo University, Department of Electrical Engineering, Cairo, Egypt

Volume

134

Issue

1

fYear

1987

fDate

2/1/1987 12:00:00 AM

Firstpage

71

Lastpage

76

Abstract

Multipath propagation on microwave line-of-sight links is analysed in the presence of an elevated inversion atmospheric layer and a reflecting earth. A bilinear height profile for the modified refractive index is adopted. Simple mathematical relations are derived for the number of rays hitting the receiver, and a graphical solution is presented for the launching and arrival angles. It is shown that path inclination tends to reduce the number of rays reaching the receiver. When more than three rays are received, signal enhancement, due to ducting, is more likely to occur. On the other hand, signal fading is more probable in the presence of two or three rays

Keywords

atmospheric boundary layer; atmospheric electromagnetic wave propagation; fading; microwave links; radiowave propagation; arrival angles; atmospheric inversion layer; bilinear height profile; ducting; elevated atmospheric duct; launching angle; line-of-sight links; mathematical relations; microwave links; modified refractive index; multipath fading; multipath propagation; path inclination; radiowave propagation; rays; receiver; reflecting Earth; signal enhancement; signal fading;

fLanguage

English

Journal_Title

Microwaves, Antennas and Propagation, IEE Proceedings H

Publisher

iet

Conference_Location

2/1/1987 12:00:00 AM

ISSN

0950-107X

Type

jour

DOI

10.1049/ip-h-2.1987.0014

Filename

4642971