VIT MITS5003 Wireless Networks & Communication Case Study

Victorian Institute of Technology(VIT)


Wireless Networks

Assessment No: 2

MITS5003|Wireless Networks & Communication

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VIT MITS5003 Wireless Networks & Communication Case Study

Designing a High speed Wireless Data Link and calculate the link budget for a LOS Wireless link


Task

Designing a High speed Wireless Data Link and 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 following to understand some of the aspects and elements that need to be considered when calculating a Link Budget.

Received Power

If the estimated/calculated received power is sufficiently large (relative to receiver sensitivity), the link budget is sufficient for sending data.

Received Power (dBm) = Transmitted Power (dBm) + Gains (dB) − Losses (dB)

Gains(dB)=Transmit Antenna gain+ Receiver Antenna Gain

 

Receiver sensitivity is the lowest power level at which the receiver can detect an RF signal and demodulate data.

Link Margin/Fade Margin

The amount by which the received power exceeds receiver sensitivity is called the link margin/fade margin.

In wireless systems, multipath propagation results in multiple copies of a signal to arrive at different signal phases at the receiver. If these signals add up destructively, the resulting signal power can be lower by a factor of 100 or 1000 (20 or 30 dB). The signal level relative to the noise declines making signal detection at the receiver more difficult. It is therefore highly recommended to keep a link margin of 30 dB when designing a wireless system.

Link Margin=Received Power-Receiver sensitivity

Losses

In a line-of-sight wireless system, losses are mainly due to free-space path loss (FSPL). Other losses are due to antenna cabling and connectors. Generally, 0.25dB loss per connector and 0.25dB loss for every 3-ft of antenna cable should be included in the link budget calculations. However, for the sake of simplicity, you can neglect these losses for your calculations.

 

df2


FSPL(dB) = 10 log10(c)

 

In dB’s the path loss when the distance (d is in km) and the frequency (f is in MHz) can be simplified as follows:

FSPL(dB) = 20log10(d) + 20log10(f) - 147.55

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  1. Calculate the FSPL in dB for a distance of 8Km and 16 Km for two different frequencies 3.6GHz, 4.2GHz and construct a table as follows:
 

FSPL(dB)

Distance(Km)

2.4GHz

5.8GHz

5

   

10

   


 

  1. 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: 10 km

Frequency: 2.4 GHz

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.

  1. 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.

Time Availability (Percentage)

Link/Fade Margin

90

8

99

18

99.9

28

99.99

38

99.999

48

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TUTOR PROPOSAL FOR : MITS5003|Wireless Networks

MITS5003 Wireless Networks & Communication includes the case study in which the main focus is on the designing of the high speed wireless link and the line of sight link budget analysis. There are several major factor that can impact the overall performance of radio system and these factors mainly include available or permitted output power, bandwidth, receiver sensitivity, antenna gains and environmental conditions. In this particular case study, I will calculate the link budget for LOS wireless link. 

In order to complete this assessment, I will resolve all the questions as per the requirements of the file. The main questions that I will resolve in this assessment include are as follows:

  1. First of all, I will calculate the FSPL in dB for the distance of about 5 km and 10 km for two different frequencies 3.6 GHz and 402 GHz as well as construct the table on it. 
  2. In second question of MITS5003 Wireless Networks & Communication, I will calculate the link budget analysis for the wireless system by including the calculation about receive power and link margin. In this, I will assume that we are using the similar antennas at the receiver and transmitter side where the link budget calculations will be similar to the link budget about the directions, which is expected to be symmetrical in all aspects. In that cases, where 2 different types of antenna systems with the distinct transmitter are utilized, I will also perform two different link budget analysis. The below given information will be considered for resolving this question:
  • Distance: 10 km
  • Frequency: 2.4 GHz
  • Link Type: Point-to-Point, Line-of-Sight
  • Tx power: +23dBm
  • Antenna gain is 24dBi
  • Assume negligible loss for the connectors and cabling 
  • Receiver sensitivity is -72dBm
  1. In third question, for the calculated link margin, I can say about the reliability and availability of the link based on the different margins that shows the complete relationship between the available link margin and the link availability as the percentage of the time. In order to appreciate the relationship between Fade Margin and Link availability in an appropriate way, I will use the graphs in order to demonstrate the entire results graphically. In this graph, the ex-axis will represent the availability and y- axis will represent the fade margin. Therefore, it will be considered as an evident that the availability of link is directly proportional to the given Fade Margin. 

This complete assessment MITS5003 Wireless Networks & Communication is based on the numerical in which I will perform the LOS link budget analysis by considering FSPL, Link Budget and link availability.