Radio Link Engineering (PPRLE)
The PPRLE Course deals with fundamental concepts in radio propagation
and application to the design of point-to-point radio links and networks. It is available for Free Download in
E-Book format. HERALD Licensed users receive this course free of charge.
The Course material is organized in eight Sessions. Each
Session includes Course Notes and the "HERALD Lab" (radio link
design exercises). An e-mail tutoring service is available to
registered users. For additional
information, please select one of the following sections :
Session 1, Hop Configuration : radio
hop and terminal site configuration; characterization of radio equipments
and antennas, main parameters; equipment parameters relevant to
interference analysis; passive repeaters.
Session 2, Basics in Link Engineering :
free space propagation, free space loss, link budget; main impairments in
terrestrial radio links; fade margin, general concepts in outage
Session 3, Path Clearance : effect
of atmospheric refraction (ray trajectories, k-factor); description of path
profile; Fresnel ellipsoid and visibility criteria; estimate of obstruction
loss (obstacle type; single and multiple obstacles).
Session 4, Ground Reflections :
path geometry, main parameters; contribution to reflected ray loss and
phase shift; Rx power vs. antenna height and k-factor, diversity
configuration; reflection coefficient vs. surface type, frequency and
Session 5, Multipath fading :
atmospheric refraction, multiple ray trajectories; Rayleigh fading,
multipath activity factor; frequency selective fading, signature
measurements; narrowband/ wideband prediction models; countermeasures
(equalization, antenna and frequency diversity).
Session 6, Rain attenuation : EM
wave interaction with atmosphere (water vapor, oxygen, raindrops); rain
attenuation vs. rain-rate, frequency, and polarization; ITU rain
statistics, rain intensity prediction model; frequency / polarization
Session 7, Interference : RF
channel arrangements (co-channel, interleaved, patterns); ITU-R Recs;
analysis and classification of interference sources in linear, radial and
meshed networks; estimate of interference power, effect of propagation;
performance degradation caused by interference.
Session 8, ITU objectives : Error
performance and unavailability objectives, relevant parameters; application
of ITU-T Recs. G.821 and G.826 to radio links; other relevant ITU-T and
ITU-R recommendations; example presentation; comparison with design
In each Session, presentation is organized in two steps: the Basic
level is addressed to a single hop design and introduces the most usual
and simple propagation models. The Advanced level gives a more
detailed treatment of additional topics; it covers RF planning,
interference, ITU performance objectives and in-depth propagation modeling.
Each Course Session is complemented with radio link design
exercises ("HERALD Lab"). The HERALD program (Professional edition) is used to execute the design exercises.
Each exercise is illustrated with step-by-step instructions. If you are not a HERALD licensee, you
can execute the HERALD Lab exercises using the HERALD Demo release.
An e-mail tutoring service is available to registered users. In
any moment, you can ask questions and you receive assistance, both
in clarifying basic theory and in executing design exercises.
Course Registration and Delivery
The PPRLE Course material includes :
Course Notes, Basic and Advanced
Sessions (E-Book format)
HERALD Lab guided exercises (E-Book
HERALD Demo (available for free
Four month e-mail tutoring service.