Wireless Communication: FSPL and Link Budget Analysis

This document discusses the calculation of Free Space Path Loss (FSPL) in dB for different frequencies and distances in wireless communication. It also covers the link budget analysis for a wireless system, including the calculation of received power and link margin. The availability or reliability of the link based on the calculated link margin is also discussed.

Running Head: ELECTRONICS
Wireless communication
Student’s Name
Course
University
Date

EECTRONICS 2
a) Calculate the FSPL in dB for a distance of 5km and 10km for different frequencies
5.8GHz, 2.4GHHz and construct a table as follows;
FSPL dB
Distance km 2.4GHz 5.8 GHz
5 114.0336 121.6980
10 120.0542 127.0542
FSPL dB=20log10(d) + 20log10 (f) + 32.45
20log10 (5) + 20log10 (2400 MHz) + 32.45
=13.9794+ 67.6042 + 32.45
=114.0336
FSPL dB=20log10(d) + 20log10 (f) + 32.45
20log10 (5) + 20log10 (5800 MHz) + 32.45
=13.9794 + 75.2686 + 32.45
=121.6980
FSPL dB=20log10(d) + 20log10 (f) + 32.45
20log10 (10) + 20log10 (2400 MHz) + 32.45
=20 + 67.6042 + 32.45
=120.0542

EECTRONICS 3
FSPL dB=20log10(d) + 20log10 (f) + 32.45
20log10 (10) + 20log10 (5800 MHz) + 32.45
=20 + 75.2686 + 32.45
=127.0542
b) 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 5km
Frequency 5.8GHz
Link type Point-to-point, line-of-sight
Tx power +23 dBm
Antenna gain 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 direction 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.

EECTRONICS 4
Received power=transmitted power (dBm) + gains (dB) – loses (dB)
Transmitted power= +23 dBm
Gains =transmitted antenna gain + receiver antenna gain
24dBi + 24dBi
=48 dBi
Loses (dB) = 20 log10(d) + 20log10 (f) + 32.45
20log10 (5) + 20log10 (5.8GHz) + 32.45
=13.9794 + 75.2686 + 32.45
= 121.6980
Received power= +23 dBm + 48 dB - 121.6980dB
=-50.7dB
Received sensitivity is termed as smallest level of power of which the RF signal can be detected
by the receiver and also can detect demodulate data (Barbieri etal., 2017)
Link margin=received power-receive sensitivity
Received power=121.6980dB
Received sensitivity= -72dBm
=-121.6980dB- (-72dBm)
=-121.7 +72dBm
= --49.7dB

EECTRONICS 5
c) For the calculated link margin at 5km what can you say about the availability or
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.
Time availability (percentage) Link or fade margin
90 8
99 18
99.9 28
99.99 38
99.999 48
The availability or reliability of the link based on the above Table which shows the
relationship between the available link margin and link availability as a percentage of time is
commonly based on the year average concerning the outage of the link this is because of
fades that is usually calculated on the months basis that are at bad state (Ghorbanzadeh etal.,
2016).

EECTRONICS 6
Reference
Barbieri, A., Tingfang, J.I., Damnjanovic, A., Gaal, P., & Luo, T. (2017). U.S. Patent No.
9,609,536. Washington, DC: U.S. Patent and Trademark Office.
Ghorbanzadeh, M., Visotsky, E., Moorut, P., & Clancy, C. (2016). Radar interference into LTE
base stations in the 3.5GHz band. Physical Communication, 20, 33-47.