Assignment Task: Designing a High speed Wireless Data Link - Line of Sight Link Budget Analysis
Several major factors that can impact the performance of a radio system are
- Available/permitted output power,
- Bandwidth,
- Receiver sensitivity,
- Antenna gains
- Environmental conditions
In this case study, the students will be required to calculate the link budget for a LOS Wireless link. Read through the attached to understand some of the aspects and elements that need to be considered when calculating a Link Budget.
Problem 1: Calculate the FSPL in dB for a distance of 5Km and 10 Km for two different frequencies 5.8GHz, 2.4GHz and construct a table as follows:
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FSPL(dB)
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Distance(Km)
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2.4GHz
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5.8GHz
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5
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|
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10
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|
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Problem 2: For the information given below, calculate the link budget analysis for the wireless system, which will involve calculating the following:
- Received Power
- Link Margin
Distance: 5 km
Frequency: 5.8GHz
Link Type: Point-to-Point, Line-of-Sight
Tx power: +23dBm
Antenna gain is 24dBi
Assume negligible loss for cabling and connectors
Receiver Sensitivity: -72dBm
Assume that we are using the same antennas at the transmitter and the receiver side, the link budget calculations will be the same as the link budget in both directions is expected to be symmetrical. In cases where 2 types of antenna systems with different transmit power are used, we must perform two link budget analysis, one in each direction.
Problem 3: For the calculated Link Margin at 5Km what can you say about the availability/reliability of the link based on the following Table which shows the relationship between the available link margin and link availability as a percentage of time.
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Time Availability (Percentage)
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Link/Fade Margin
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90
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8
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99
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18
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99.9
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28
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99.99
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38
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99.999
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48
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Attachment:- Data Link Line of Sight Link.rar