Courses - Point-to-Point Radio Link Design
(click below to access Course Content)
Introduction & Basics
Motivation of this Training Program is briefly presented. Then, the
Free Space Radio Link Equation is presented. Moving to terrestrial radio
links, we discuss Link Budget and Fade Margin, which are the tools useful
to predict radio hop Outage Probability.
Path Analysis, Obstructions
The propagation path of a radio wave through the atmosphere is
discussed by introducing the k-factor concept. Possible deviations from
standard conditions are identified, as well as the minimum k-factor value.
Then the Fresnel ellipsoid is defined; partial obstructions of the
ellipsoid lead to the obstruction loss estimate. Finally, ITU-R recommended
Clearance Criteria are presented.
conditions likely to produce multipath propagation are first considered.
Received signal impairments and multipath activity statistics are described,
introducing the multipath occurrence factor. Multipath models are applied
to outage prediction (narrow- and wide-band systems). Finally, multipath
countermeasures (adaptive equalization, diversity) are considered.
First, the interaction of an EM wave with molecules or
particles in the atmosphere is discussed. This leads to an estimate of rain
specific attenuation, as a function of rain intensity, signal frequency and
polarization. Worlwide statistical data on rain intensity are considered,
as required by the ITU-R rain model to predict rain unavailability, at
frequencies up to 90 GHz.
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