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Transcript of final Pres12
FSS Enhancement of Multipath for MIMO/4G Wireless Communications
Supervisor Dr Peter Callaghan
Presentation By Devinder Pal Singh
MSc Electronics and Communications
IntroductionThis Project deals with the coverage issues being faced in Modern Offices such Large data files transfers. Transcieve of signals for large data files via Wireless modeThe Frequency Selective Surfaces and multiple Inputs and Multiple Outputs could be used together for resolving coverage issues in Modern offices to transfer large data files. Low cost signal could be transferred at same frequency.
Advantages
1. Mobilize and High Performance
2. Data Transfer at High Speeds.3. Low Cost.4. Less Layout of Cable .5. Security6. Less chances of fading of
signals especially in the room corners and dead areas such as base.
7. Low interference.Note: The output of FSS with MIMO depend upon the size of the reflective FSS material.
Block Diagram for FSS Enhancement of Multipath for MIMO/4G Wireless
Communications
WLAN Device MIMO Transmitter
WLAN Device MIMO Receiver
FSS
FSS
Objectives• Discover the device capabilities which could
reflect multiple inputs and multiple outputs. • Evaluation, design and testing of suitable
Frequency Selective Surface structures.• Evaluation of file transfer protocols to transfer the
data between two communication devices.• Design a platform with FSS and MIMO
equipment which could transfer larger data files at the speed of 2-5Mbps in indoor environment.
Project Deliverables
• Review MIMO Systems-Identify candidate hardware for test (WLAN).
• FSS (band stop at 2.4GHz) design.– Design Method– Experimental Hardware– Frequency Response (Transmission) Results.
• Enhanced Multipath Experiment –Results.
Implementation
FSS Design Fabrication
•Solid Works Software•ARES Software
Design Model For FSS Testing in Anechoic Chamber
101cm
146cm
58cm
10cm
Radius 8.5cm
60 cm101cm
3cm
3cm
Wooden support Lengths
Wooden Base to support
Sheet/FSS
Wooden base to connect support with Antenna Pole
Wooden Base
Design Model to Support the FSS in front of Antenna Pole
Wooden Design Model for FSS Testing
1.7-2.4GHz Horn Antenna
Wooden Support Lengths (Rods) for the
placement of FSS
Absorbent material
Anechoic Chamber Inside and placed with the wooden design model for measurements
Antenna PoleScale distance used to
measure frequency Response at different scale
25 Square Loop FSS Design was made with Solid State Works
S=2mm
g=3mm
Square loop array/matrix designed with Solid State Works
FSS Designed with the ARES Software
Square Loop Array Designed with the ARES Software
Gap of 3mm between square length
Square Loop with the thickness of 2mm
ARES Software
297mmx210mm FSS design developed with ARES Software shown in the figure below.
PCB Square Loop Array designed with Ares Software
FSS Design Under Testing
1.7GHz-2.4GHz Horn Antenna
Wooded block being used as scale to check frequency response at different
scale.
Square Loop Array /FSS under observation
FSS Design Under Test
Block diagram of Implementation of FSS with 4G/Wireless
Reflector (FSS)
Comm. Device with MIMO Device
Wireless MIMO Antenna
Coaxial cable
Absorbing Material
Network Analyser
Reflector (FSS)
Setup of MIMO/FSS for File Transfer
Aerial Antenna
FSS/MIMO devices installed inside /outside chamber for large data transfer
FSS
MIMO Devices
Results
Frequency Responses of FSS
Frequency Response of Solid State Works FSS The response was taken at a distance of 500 mm. • The top curve represents a
normalized response. • The bottom curve
represents a band stop at 2.2GHz at -33.2 dB .
• Ripples were also found as due to dimension of the copper strip of not correct thickness and also of no proper gap of 3mm.
Frequency Response of Solid State Works FSS
Frequency Responses of Etched Sheet
S No.
Frequency Response Distance (Millimetres)
Frequency Response Measured (dB)
1st
Band Stop
Frequency Response Measured (dB)
2nd
Band Stop
1 650 -51.257 2.153 -36 2.08
2 620 -24.33 2.08 -32 2.4
3 700 -40.42 1.9 --- ---
4 800 -23.76 2.26 ---- ----
The Curve dipped to -51.257 dB at 2.15GHz and -36dB at 2.08 GHz .
Frequency Response at 650mm
Table Shows list of frequency responses taken at different scales.
Test Done With MIMO Modems with FSS Designed
After the MIMO Modems Have been Setup the tests were done.
Four Tests have been planned
Measuring data speed between two devices of large data inside the anechoic chamber,
Using One Horizontal Antenna of Antenna installed in Anechoic Chamber with One Modem Setup Installed inside the chamber.
Using One Vertical Antenna of Antenna installed in Anechoic Chamber with One Modem Setup Installed inside the chamber.
Using Horizontal and Vertical Antenna of Antenna installed in Anechoic Chamber with One Modem Setup Installed inside the chamber.
Data Transfer Speed Measurements
MIMO/FSS Design
Data Transfer Speed in Anechoic Chamber Kbps With/Without MIMO and FSS.
1 2 3 4 5 60
1000
2000
3000
4000
5000
6000
Transfer Speed without MIMOTransfer with DongleWithOut ReflectorTransfer with With Reflector
Graph Shows speed measurement with/ without MIMO & Reflector
Data Speed in Corners/DUT
Table Shows test Results done with MIMO and FSS at the corners/Device Under Test area of Anechoic Chamber.
S No. Corner Right Side Area with both antennas Only one Horizontal Antenna Only one Vertical Antenna1 3846 3456 28972 4004 3567 31333 4018 3689 34214 4078 3891 3678
S No. Corner Left Side Area with both antennas Only one Horizontal Antenna Only one Vertical Antenna
1 3340 3456 28972 3432 3567 31333 3679 3689 34214 3879 3891 3678
S No. Below DUT(Device Under Test) Area One Horizontal Antenna One Vertical Antenna
1 2233 2021 21112 2571 2111 22133 2633 2232 23454 2909 2324 2355
Data transfer speed analysis in different areas (Kbps)
1 2 3 40
500
1000
1500
2000
2500
3000
3500
4000
4500
Corner Right Side Area with both antennasCorner Left Side Area with both antennasBelow DUT(Device Under Test) Area
Conclusion
• The FSS enhancement of Multipath for Multi Input Multi Output was successfully designed and tested. Results were analysed at different distances from the device under test area. From the results the response of -51.257dB at 2.153 at 650mm distance from the device under test area and a satisfactory behaviour of-32dB at 2.4GHz was .
• Large data filestransferred at a speed 4-5.2Mbps in the normal indoor office location, 2-3Mbps in the basement areas and 3-4.5Mbps in the room corners .
Future Work
In order to have transfer large data files at speed a high speed.- A Larger FSS would be beneficial. - Full version File transfer protocols would be
beneficial for speed analysis.- Analysis of data speed of 2.4 GHz for better
indoor communications.
Thanks You