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