Line of Sight Wireless Link: Detailed Link Budget Analysis

This document presents a detailed line of sight (LOS) link budget analysis for a wireless data link, focusing on key factors impacting radio system performance such as available output power, bandwidth, receiver sensitivity, and antenna gains. It includes calculations for free space path loss (FSPL) at varying distances and frequencies (2.4GHz and 5.8GHz). The analysis determines received power and link margin using provided formulas, considering antenna gains and path loss. Based on the calculated link margin, the document assesses the time availability of the wireless link, concluding on the reliability of the radio system. The study emphasizes the importance of minimizing path loss to ensure optimal wireless communication performance. This solved assignment is available on Desklib, where students can find a wide array of study resources.

LOS Link budget analysis

LINK BUDGET 1
Table of Contents
Line of Sight Link Budget Analysis......................................................................................................2
Question (a)...........................................................................................................................................2
Question (b).......................................................................................................................................2
Question (c)...........................................................................................................................................3
References.............................................................................................................................................5

LINK BUDGET 2
Line of Sight Link Budget Analysis
As per the given case study, the performance of the radio system depends on the bandwidth,
receiver sensitivity, antenna gains and other factors (Sun, et al., 2016). The aim of this study
is to analyse the concept of link budget and solve numbers of practice questions based on the
link margin, path loss and received power.
Question (a)
After reviewing the provided question it is evaluated that the values of distances and
frequencies for finding FPSL are given as:
D1= 5KM & D2= 10KM
F1= 2.4GHz & F2= 5.8GHz
Now, free space path loss can be calculated with the below formula:
Put values of both distance and frequency in the above equation total free space path loss in
dB can be obtained and it is indicated in the below table at different distances and frequencies
(Alam, and Khan, 2013).
FSPL(dB)
Distance in KM At 2.4GHz At 5.8GHz
5 KM 114.03 121.70
10 KM 120.05 127.72
Question (b)
From the given case study it is found that the value of received power and link margin can be
determined with the below formulas (Tuovinen, Tervo, and Pärssinen, 2017):

LINK BUDGET 3
As per the given question, put the value of each factor in the above equation but it is assumed
we are using the same antennas at both side (transmitter and receiver) that means a total gain
of the antenna is 24*2= 48dBi.
For received power:
Received power(dBm)= 23+48+ path loss
Now, path loss can be obtained with the below formula
Put d= 5KM and f= 5.8GHz
So, path loss= 121.70dB
Therefore, received power= 23+48-121.70
Or, Received power(dBm)= -(50.7)dBm
For link margin:
Put value of received power and receiver sensitivity in the formula of link margin which is
indicated in the below equation:
Link Margin= -50.7- (-72)= -50.7+72
Therefore, the value of link margin at 5KM is 21.3dBm.
Question (c)
By solving the question (b) it is observed that the value of link margin at 5KM and 5.8GHz
frequency is approximate 21.3 dBm. The below table indicates the availability of time with
respect to the link margin and it can be analysed with the obtained link margin at 5KM.

LINK BUDGET 4
So, the obtained link margin is 21.3 dBm and as per the above table, the value of time
availability is approx. 995 which indicate that the overall link budget and radio system is
reliable and available between transmitter and receiver. Moreover, it is recommended that the
value of path loss should be less because it can affect wireless communication and reduce
time availability along with the link margin (Sharma, and Singh, 2012).

LINK BUDGET 5
References
Sun, S., Rappaport, T.S., Rangan, S., Thomas, T.A., Ghosh, A., Kovacs, I.Z., Rodriguez, I.,
Koymen, O., Partyka, A. and Jarvelainen, J., (2016) Propagation path loss models for 5G
urban micro-and macro-cellular scenarios. In 2016 IEEE 83rd Vehicular Technology
Conference (VTC Spring), 12(2)
, pp. 1-6). IEEE.
Alam, D. and Khan, R.H., (2013) Comparative study of path loss models of WiMAX at 2.5
GHz frequency band. International Journal of Future Generation Communication and
Networking, 6(2), pp.11-23.
Tuovinen, T., Tervo, N. and Pärssinen, A., (2017) Analyzing 5G RF system performance and
relation to link budget for directive MIMO. IEEE Transactions on Antennas and
Propagation, 65(12), pp.6636-6645.
Sharma, P.K. and Singh, R.K., (2012) Cell coverage area and link budget calculations in the
GSM system. International Journal of Modern Engineering Research (IJMER), 2(2), pp.170-
176.