Question

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.

Answer 1

Free Space Path Loss = 20log (5000) + 20 log(5.8 * 10^9) + 32.44

Total received Power = Transmitter Power + Transmitter Antenna Gain - Free Space Path Loss + Receiver Antenna Gain

= -50.70 dBm

Link Margin = Receiver Sensitivity - Received Power

= 72 - 50.70 = 21.3 dBm