Cellular Device Detection

InstructorInstructor :: Yossi HipshYossi Hipsh Performed byPerformed by:: Smadar Katan Smadar Katan

Gal Mendelson Gal Mendelson Project Number: D0517Project Number: D0517

Winter 2007/8Winter 2007/8

Semesterial ProjectSemesterial Project

Midterm PresentationMidterm Presentation

General specifications

• Room size : 4mX6m.

• The tables are 0.7m high.

• 2 Multi-beam antenna at each side of the room for full coverage.

The Room

θroom θroom

General specifications (Continue…)

• So far there was a solution for one cellular device in the room.

• Our project deals with two cellular devices in the room

• The devices are far enough from one another that they will be received in two different pairs of beams.

General specifications (Continue…)

CompanyTransmission Frequency

Partner902.2-910 MHz 947-955.2 MHz 910.2-912.2 MHz 955.2-957.2 MHz

Cellcom835-845 MHz 880-890 MHz1710-1712 MHz 1805-1807 MHz

Pelephone825-835 MHz 870-880 MHz845-847 MHz 890-892 MHz

General specifications (Continue…)

CompanyTransmission Frequency

Partner902.2-910 MHz 947-955.2 MHz 910.2-912.2 MHz 955.2-957.2 MHz

Cellcom835-845 MHz 880-890 MHz1710-1712 MHz 1805-1807 MHz

Pelephone825-835 MHz 870-880 MHz845-847 MHz 890-892 MHz

General specifications (Continue…)- power of Mobile Station

Mobile ClassGSM 900GSM 1800

130 dbm = 1 Watt

224 dbm = 0.25 Watt

336 dbm = 4 Watt

4

5

Since we are dealing with Cellcom for now we will focus on GSM:

Mobile stations can come in different power classes, which define the

maximum RF power level that the unit can transmit.

For GSM-900 there are five powers classes, for GSM-1800 there are three

power classes.

Solution suggestion

Energy Detector

Energy Detector

Energy Detector

Energy Detector

Comput ing Unit

Displ ay

Our Part

Contr ol l er

Our Part Our Part

Beams M

B

A

B

F

N

Beams M

B

A

B

F

N

Antenna frequency:

Wave length:

Definitions and Sizes

• 4 Dipole Antenna Array: (the sizes are from measurement)

1.7[ ]f GHz

d=43cm

57/8 cm

3.8cm

7.8cm

8

9

3*10 sec17

11.7*10sec

mc

cmf

17 cm

Definitions and Sizes (continue…)

• The angles are:

3

51* 51*0.1721

0.43dB d

•Where 9 (deg ) 33dB ree

Beams’ angles

Calculations (continue…)

9 (deg )

584

2Room dB ree 2 2 2 2 26 4 (6 ) 4 2* 4 (6 ) 4 *cos Roomx x x x

X=0.5m

In order to maintain symmetry we will place the antenna as following:

Geometry

BFN

Rec iever

Rec iever

Rec iever Ener gy det ec t or

Ener gy det ec t or

Ener gy det ec t or

Rec iever

Rec iever

Rec iever Ener gy det ec t or

Ener gy det ec t or

Ener gy det ec t or

The Beams

• To manufacture beams that point to different directions we need to change the length of the micro strip lines in the following way:

The Beams (continue…)

• Let’s observe two dipoles

• We see that • L=11.6 cm

11sin sin

dd L

L

The Beams (continue…)

Now we can determine:

Computing

Location

2 2 2 20.5 2 4.25 4.25 2.061 ; 5.5 2 34.25 34.25 5.85

21 1

2

0.5 4.25 4 4 4.25 cos 14

42 14 28

Calculation of rotation angle of the antenna:

From the "Law of cosine":

Location

Supervisor

Antenna B

Antenna D Antenna C

280

Y

X(0,0)

Antenna A

280

eAeB

A B

Location (continue…)

Time Schedule

- Design and manufacture BFN for two beams

which includes

- BFN for θ angle (manufacturing 2)

- Power combiner network 2:1 (manufacturing 8)

- Integrating .

17.02.08

-Developing the Simulator 17.03.08

-Final report and presentation 1.04.08