1. Indoor Propagation Models at 2.4 GHz for 802.11b Networks
Dinesh Tummala
Department of Engineering Technology

2. Advisory Committee Dr. Albert B. Grubbs Dr. Robert Akl
Dr. Robert G. Hayes
Dr. Vijay Vaidyanathan
11/10/2018

3. Outline Introduction Problem Statement Background of the Problem
Review of Literature
Assumptions
Hypothesis
Methodology
11/10/2018

4. Introduction Wireless Communication
The first rush to wireless was for voice. Now, the attention is on data.
Wireless Local Area Networks (WLANs) provide network services where it is difficult or too expensive to deploy a fixed infrastructure.
WLANs operate mainly in a indoor environment.
11/10/2018

5. Problem Statement
Indoor use of wireless systems poses one of the biggest design challenges.
It is difficult to predict the propagation of a RF wave in an indoor environment.
To assist in deploying the above systems, characterization of the indoor radio propagation channel is essential.
This study aims at developing an indoor propagation model from measurements taken using b compliant access point and client adapters.
11/10/2018

6. Background of the Problem
Line of Sight Propagation
Attenuation
Multipath
Fading
Free Space Loss
Noise
Atmospheric Absorption
Refraction
11/10/2018

7. Background of the Problem
Indoor RF Propagation and Wireless LAN Technology
Access Points
Wireless Client Adapter
11/10/2018

8. Background of the Problem
IEEE Standard
802.11a
802.11b
802.11g
11/10/2018

9. Background of the Problem
Frequency Range and Channel Allocation for b
11/10/2018

10. Background of the Problem
802.11b Channel Overlap
11/10/2018

11. Literature Review
Existing models tend to focus on a particular characteristic like temporal fading or inter floor losses.
11/10/2018

12. Assumptions
The scenarios considered provide a sufficient number of data acquisition values to develop an accurate model.
The access points considered for signal measurements possess the same antenna behavior in comparison to industry standards.
11/10/2018

13. Hypotheses
Null Hypotheses: Indoor radio propagation at 2.4 GHz is not dependent on the indoor environment.
Alternative Hypotheses: Indoor radio propagation at 2.4 GHz is dependent on the indoor environment.
11/10/2018

14. Methodology Hardware & Software Hardware Access Points Client Adapter
NetStumbler
11/10/2018

15. Propagation Environment
The power received by a mobile receiver is influenced by the characteristics of the propagation environment.
The measurements are to be conducted at The College of Engineering, University of North Texas, Research Park.
11/10/2018

16. NTRP 1st Floor
11/10/2018

17. NTRP 2nd Floor
11/10/2018

18. CSE Floor Plan
11/10/2018

19. Measurement Scenarios
Scenarios used will help in developing signal loss equations, by which a generalization for propagation in an indoor environment at 2.4 GHz can be obtained.
11/10/2018

20. Measurement Scenarios
Open corridor
Closed Corridor
Class room
Staircase
Computer lab
Two Floor
11/10/2018

21. Data Acquisition
Using NetStumbler measurements are taken for the above described scenarios. In each scenario the signal strength is measured for both (LinkSys and D-Link) access points at regular increments of distance.
At each interval sufficient signal measurements are taken.
11/10/2018

22. Open Corridor Signal level vs Distance
11/10/2018

23. Data Analysis
Signal strengths measured in each scenario at different distances are analyzed to get mean signal level values at each distance interval.
A loss equation is generated for each scenario using the obtained data values.
A GUI interface is developed to visualize the simulation.
11/10/2018

24. Open Corridor D-Link vs LinkSys
11/10/2018

25. Conclusion
Scenarios used will help in developing signal loss equations, by which a generalization for propagation in an indoor environment at 2.4 GHz can be obtained.
11/10/2018

26. Thank You!!
Questions?
11/10/2018