Figure 9-11. Multipath Reception - Alvarion BreezeNET PRO.11 Series User Manual

Fading of the RF signal is caused by several factors:
Multipath
The transmitted signal arrives at the receiver from different directions, with dif-
ferent path lengths, attenuation and delays. The summed signal at the receiver may
result in an attenuated signal.
Bad Line of Sight
An optical line of sight exists if an imaginary straight line can connect the antennas
on either side of the link.
Radio wave clear line of sight exists if a certain area around the optical line of sight
(Fresnel zone) is clear of obstacles. A bad line of sight exists if the first Fresnel
zone is obscured.
Link Budget Calculations
Weather conditions (Rain, wind, etc.)
At high rain intensity (150 mm/hr), the fading of an RF signal at 2.4 GHz may
reach a maximum of 0.02 dB/Km
Wind may cause fading due to antenna motion.
BreezeNET PRO.11

Figure 9-11. Multipath Reception

9-23
Appendix
User's
Guide