EDDC 0423
Advanced Communication
System and Design
Microwave Engineering
BSECE 4th year
Engr. Christopher V. Maglaque, MEM
Assistant Professor IV
Path Profile
Advanced
Communication
System and
Design
- MICROWAVE LINK CALCULATIONS
A Path Profile is a graphical representation of the path traveled by
the radio waves between the two ends of a link. The path profile
determines the location and height of the antenna at each end of
the link, and it insures that the link is free of obstructions, such as
hills, and not subject to propagation losses from radio phenomena,
such as multipath reflections.
Advanced
Communication
System and
Design
- MICROWAVE LINK CALCULATIONS
Advanced
Communication
System and
Design
- MICROWAVE LINK CALCULATIONS
Advanced
Communication
System and
Design
- MICROWAVE LINK CALCULATIONS
Advanced
Communication
System and
Design
- MICROWAVE LINK CALCULATIONS
Advanced
Communication
System and
Design
- MICROWAVE LINK CALCULATIONS
Advanced
Communication
System and
Design
- MICROWAVE LINK CALCULATIONS
Advanced
Communication
System and
Design
- MICROWAVE LINK CALCULATIONS
Advanced
Communication
System and
Design
- MICROWAVE LINK CALCULATIONS
Sample Problem:
Advanced
Communication
System and
Design
- MICROWAVE LINK CALCULATIONS
An FM LOS microwave link operates at 6.15 GHz. The required receiver IF
bandwidth is 20MHz. The transmitter output power is 30dBm. The receiver
front end’s first active stage is a mixer with a noise figure of 9dB. The path
length is 21 mi; the antennas at each end have a 35-dB gain and the
transmission line losses at each end are 3dB. If the FM Improvement threshold
is used as the unfaded reference, what is the reliability of the radio link?
Solutions:
Advanced
Communication
System and
Design
- MICROWAVE LINK CALCULATIONS
Solutions:
Advanced
Communication
System and
Design
- MICROWAVE LINK CALCULATIONS
Solutions:
Advanced
Communication
System and
Design
- MICROWAVE LINK CALCULATIONS
Solutions:
Advanced
Communication
System and
Design
- MICROWAVE LINK CALCULATIONS
Solutions:
Advanced
Communication
System and
Design
- MICROWAVE LINK CALCULATIONS
Advanced
Communication
System and
Design
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Advanced
Communication
System and
Design
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Advanced
Communication
System and
Design
- MICROWAVE LINK CALCULATIONS
Advanced
Communication
System and
Design
- MICROWAVE LINK CALCULATIONS
Sample Problem
What fade margin is required for a microwave LOS link with a time
availability requirements of 99.997%?
Advanced
Communication
System and
Design
- Microwave System Performance
DIVERSITY TECHNIQUE
1. Frequency Diversity
Advanced
Communication
System and
Design
- DiversityTechnique
Frequency diversity is simply modulating two different RF carrier
frequencies with same IF intelligence, then transmitting both RF
signals to a given destination. At the destination, both carriers are
demodulated, and the one that yields the better-quality IF signal is
selected.
DIVERSITY TECHNIQUE
2. Space Diversity
Advanced
Communication
System and
Design
- DiversityTechnique
With space diversity, the output of a transmitter is fed to two or
more antennas that are physically separated by an appreciable
number of wavelengths
Advanced
Communication
System and
Design
- Q&A
QUESTIONS???
Advanced
Communication
System and
Design
THANK YOU & GOD BLESS
STAY SAFE EVERYONE