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Point-to-Point 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 Contents

*  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 prediction.

*  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 polarization.

*  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 scaling.

*  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 predictions.


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.


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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.


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Tutoring Service


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.


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Course Registration and Delivery


The PPRLE Course material includes :


*     Course Notes, Basic and Advanced Sessions (E-Book format)

*     HERALD Lab guided exercises (E-Book format)

*     HERALD Demo (available for free download

*     Four month e-mail tutoring service.


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