LINK BUDGET. Wireless and network communication. 0. LIN

LINK BUDGET 0
Wireless and network communication

LINK BUDGET 1
Contents
LOS Link Budget Analysis.............................................................................................................................2
Question number-1.....................................................................................................................................2
Question Number-2.....................................................................................................................................3
Question Number-3.....................................................................................................................................5
References...................................................................................................................................................6

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LOS Link Budget Analysis
As stated in this given case study the overall efficiency of radio system varies by
changing the values of output power, bandwidth, receiver sensitivity, antennas gains and
other factors (Hussain, Che, Yue, & Wu, 2015). Moreover, there are various kinds of
formulas and processes which can be used for identifying and analyzing a line of sight link
budget which are described below:
Question number-1
The main focus of this question is to determine the total free space path loss at different
distance and frequency. In which there are two distances and two frequencies given for
calculating total FSPL in dB which are indicated below:
Distance in KM Frequency in GHz
5 KM 2.4 GHz
10 KM 5.8 GHz
Now, below formula will provide the overall value of FSPL in dB:

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For d= 5km and f= 2.4GHz
FSPL(dB)= 20log10(5)+20log10(2.4GHz)+32.45
Or, FSPL(dB)= 114.03 dB
For d= 5km and f= 5.8GHz
FSPL(dB)= 20log10(5)+20log10(5.8GHz)+32.45
Or, FSPL(dB)= 121.70 dB
For d= 10km and f= 2.4GHz
FSPL(dB)= 20log10(10)+20log10(2.4GHz)+32.45
Or, FSPL(dB)= 120.05 dB
For d= 10km and f= 5.8GHz
FSPL(dB)= 20log10(10)+20log10(5.8GHz)+32.45
Or, FSPL(dB)= 127.72 dB
Question Number-2
There are major two parts of this question which includes received power and link
margin.
For received power:

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According to the given data in the question, both antennas are the same (Tx and Rx) so the
total gain is 48 dBm and total losses are given as:
Here, d=5KM and f=5.8GHz
Now, FSPL(dB)= 20*log10 (5) + 20*log10 (5.8 GHz) + 32.45
Or in another word total loss occurs in the system is 121.7 dB.
These values can help in finding total received power which is described below:
Received power (dBm) = (23) + (48) - (121.70)
Therefore, the total received power is (-50.70) dBm.
For link margin
In which total link margin can be calculated with the below formula:
So, link margin= -50.7 + 72= 21.3 dBm
Moreover, the link budget for the given data is determined as:

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Therefore, the total link budget is (-50.7) dBm.
Question Number-3
In this question the obtained value of link margin in the above question will be
analyzed based on a table which is described below:
From the above question, it is obtained that the total link margin is 21.30dBm which
is sufficient for sending and receiving data from transmitter to receiver. In the case of
availability/reliability, the obtained link margin provided 99% availability. It means the
receiver received signals on the given time and also indicate that overall communication is
enough reliable but it needs to be improved for perfect communication (Techopedia, 2018).

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References
Hussain, B., Che, F., Yue, C. P., & Wu, L. (2015). Link budget analysis for visible light
communication systems. In 2015 IEEE International Wireless Symposium (IWS 2015),
12(6),1-4.
Techopedia (2018). Link Budget. Retrieved from:
https://www.techopedia.com/definition/8075/link-budget-telecommunication