Cours Transmission Par Faisceaux Hertziens Pdf full Download

Faisceau Hertzien (Microwave Radio Link) is a point-to-point wireless transmission system that uses highly directional radio waves to connect two distant sites. These systems primarily operate in the microwave frequency range from 1 GHz to 40 GHz 1. Fundamental Principles and Characteristics

Microwave links are characterized by high-speed data transfer and rapid deployment. Unlike omnidirectional broadcasts, they focus energy into a narrow beam, requiring a strict Line-of-Sight (LOS) between antennas. Transmission des faisceaux hertziens | PDF - Scribd

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Searching for a "Cours Transmission Par Faisceaux Hertziens PDF"

typically leads to technical resources covering point-to-point radio communication systems. These systems are vital for telecommunications, especially in areas where laying fiber optic cables is impractical. Axians France Core Concepts of Microwave Transmission (FH) A comprehensive course on Faisceaux Hertziens (FH) usually covers the following fundamental pillars: Cours Transmission Par Faisceaux Hertziens Pdf Download

Etude de l'exposition aux ondes générée par les faisceaux hertziens

Because I cannot directly host or provide a downloadable PDF file, I have compiled a complete technical paper below based on standard telecommunications engineering curricula. You can copy and save this content as a PDF for your study.

6. Frequency Bands and Channel Planning

Licensed bands (6, 11, 18, 23, 38 GHz) vs. unlicensed (2.4, 5.8 GHz).
Interference coordination and frequency reuse patterns.

Common Exam Questions & Exercises (With Solutions)

A good PDF will include practice problems. Here are typical questions:

Practical Example: Designing a 20 km Hertzian Link

Let’s apply typical formulas from any Cours Transmission Par Faisceaux Hertziens PDF to a realistic scenario. Faisceau Hertzien (Microwave Radio Link) is a point-to-point

Parameters:

Distance: 20 km
Frequency: 18 GHz
Tx Power: +20 dBm
Antenna Diameter: 0.6 m (Gain ≈ 38 dBi each)
Receiver Sensitivity: -72 dBm (for 64-QAM, 28 MHz channel)

Calculations:

Free Space Path Loss:
FSPL (dB) = 92.45 + 20 log10(20) + 20 log10(18)
= 92.45 + 26.02 + 25.10 = 143.57 dB
Total Gain & Loss:
Total Gain = 38 + 38 = 76 dBi
Total Loss = 143.57 dB Important Notice I do not host, upload, or
Received Power (Pr):
Pr = 20 + 76 - 143.57 = -47.57 dBm
Fading Margin:
Margin = Pr - Sensitivity = -47.57 - (-72) = 24.43 dB
This margin is acceptable for links with 99.9% availability but may need improvement for 99.999% (e.g., increase antenna size or reduce hop length).

6. Digital Modulation in Radio Relays

Modern transmission is digital. The modulation scheme determines the spectral efficiency and robustness of the link.

QPSK (Quadrature Phase Shift Keying): Very robust, used for long-distance links with lower capacity.
16-QAM / 64-QAM: Higher capacity but requires a higher Signal-to-Noise Ratio (SNR) and is more susceptible to interference.
256-QAM / 1024-QAM: Used in modern High-Capacity links, requiring extremely high linearity and precision.

Adaptive Coding and Modulation (ACM): Newer systems automatically switch modulation schemes based on the propagation conditions. If heavy rain reduces signal quality, the system drops from 256-QAM to QPSK to maintain the link, albeit at a lower data rate.