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Department of Electrical Engineering High-Speed Digital Systems Laboratory. HS DSL. !. Detection of Cellular Activity Within A Defined Space Undergraduate Project – Final Presentation Spring 2008. Doron BrotEyal Cimet Supervisor:Yossi Hipsh. The Main Objective.

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Doron brot eyal cimet supervisor yossi hipsh

Department of Electrical Engineering High-Speed Digital Systems Laboratory

HS DSL

!

Detection of Cellular Activity Within A Defined SpaceUndergraduate Project – Final PresentationSpring 2008

Doron BrotEyal Cimet Supervisor:Yossi Hipsh


The main objective

The Main Objective

  • Detection and Positioning of Cellular Phone Activity In a Defined Space Where Cellular Use is Unwanted

2


Main system requirements

Main System Requirements

  • Detection and Positioning of Transmitting Cellular Phone

  • Desired Spatial Resolution & Accuracy:

  • Required Temporal Resolution:

  • Compatibility with all Cellular Providers

  • Detection Regardless of Phone Orientation – Reception of all Linear Polarizations

  • Ability to Handle Simultaneous Events

  • Ability to Distinguish Between Original Signal and Multi-path Reflection

3


The defined space

The Defined Space


General design aspects

General Design Aspects

5


System operation process

System Operation Process

Angle Measurement

Multi-path Filtering

Storage

Triangulation

Sampling

Origin Estimation

Filtering of Dummy Origins

Idle / Trigger

Positioning

Start


Preliminary schematic

Preliminary Schematic

Circular-Polarized Antenna(s)

Front-End Overall Band Receiver

Power Sensor

Sampling Circuit

A/D

Positioning Algorithm

CPU

Memory

CLK

A/D

Display

Power Sensor

Circular-Polarized Omni-Antenna


Angle measurement

Angle Measurement

  • Multi-beam Arrays – MBA:

    • Antennas Sensitive to Many Spatial Directions Simultaneously, Ideal for Angle Measurement

    • DifferentialAngle Measurement

    • Distance From Source Determines SignalStrength


Angle measurement continued

Angle Measurement (Continued)

The Differential Measurements from two Consecutive Beams Yields an Estimate of the Angle of Incidence

Differential Zone


Doron brot eyal cimet supervisor yossi hipsh

  • Origin of Signal is Estimated Based on Angle of Incidence with 2 MBA Antennas and Table Height:

Antenna 1

Antenna 2


Multi path

Multi-path

  • Reflections Received Simultaneously Must Be Filtered Out

Antenna 1

Antenna 2


Possible solution to multi path 1

Possible Solution to Multi-path (1)

  • Use of RF Absorbing Material

Antenna 1

Antenna 2


Possible solution to multi path 2

Possible Solution to Multi-path (2)

  • Development of Filtering Algorithm for Multi-path Reflections

Antenna 1

Antenna 2


Solution overview

Coverage of the Defined Space:

Solution Overview

Area Split to Lower the Required Dynamic Range


Solution overview1

Antenna Setup –

4 MBA’s, each with 6 directional beams

Each MBA is Comprised of 9 Narrow-Band Antennas

Solution Overview


Solution overview2

Solution Overview

  • Cellular Spectrum

    • Detection of all Cellular Providers Demands Reception of all Cellular Frequencies in Spectrum


Solution overview3

Solution Overview

  • Front-End Received Power


Solution overview4

Detection Regardless of Orientation of Cellular Phone:

Circular-polarized Antennas Receive all Linear Polarizations

Layout of Circular-polarized Antenna

Two Linearly-polarized Antennas Coupled by a 90-Degree Hybrid:

Solution Overview

Circularly-Polarized Signal

Coupler


Final design

Final Design

Trigger

Omni-directional Antenna

A/D

12 dB Amp

BPF

Detector

Display

Digital Controller

(CPU)

Front-End

Vertical MBA

Horizontal MBA

90-Degree Hybrid

DCA

12 dB Amp

A/D

BPF

Detector

Band 1

A/D

Band 2

Frequency Multiplexer

Customized Filter to All 9 Bands

Band 3

Band 9


Component survey

Component Survey

  • IPP-2036 90-Degree Coupler

    • Frequency Range: 800-2000 MHz

    • Maximum Input: 150 W

    • Insertion Loss: < 0.25 dB

  • Preferred Amplifier: ZJL-4G

    • Frequency Range: 20-4000 MHz

    • Typical Gain: 12.4 dB

    • IP3: 30.5 dB

    • Noise Figure: 5.5 dB

    • Maximum Input: 20 dBm


Component survey1

Component Survey

  • Power Detector – ZX47-40+

    • Dynamic Range: -40 to 15 dBm

    • Response Time:

    • Output Range: 0.5 – 2.1 VDC

  • Criteria in Choosing a Detector:

    • Dynamic Range Fits the System Requirements

    • Response Time Sufficiently Small compared to Typical Event Period


Component survey2

Component Survey

  • Sampling Hardware:

    • Sampler + A/D: Analog Devices AD-7999Resolution: 8 BitSampling Rate: 140 KSpSNo. of Channels: 4Reference: Peak to Peak

  • DCA: Digitally Controlled AttenuatorNormalizes the Input Power to the Dynamic Range of the Power Detector Based on the Measurement from the Omni-directional Antenna


Proof of feasibility

A Simplified Experiment Demonstrating the Basic Principles of the System, Which Proves that the Suggested Implementation Works

Proof of Feasibility


Original schematic

Original Schematic

Trigger

Omni-directional Antenna

A/D

12 dB Amp

BPF

Detector

Display

Digital Controller

(CPU)

Vertical MBA

Horizontal MBA

Front-End

90-Degree Hybrid

DCA

12 dB Amp

A/D

BPF

Detector

Band 1

A/D

Band 2

Frequency Multiplexer

Band 3

Band 9


System strip down

Number of Antennas –

System Strip-Down

Successful Detection in One Half of the Room Proves Feasibility


System strip down1

Number of Beams –

System Strip-Down

6 Original Beam Directions Simplified Down to 2


System strip down2

System Strip-Down


The minimal system for proof of feasibility 1

The Minimal System for Proof of Feasibility(1)

Horizontal MBA Antenna 1

Version Using HF Digitizing Scope

Beam 1

12 dB Amp

Beam 2

Scope/CPU:

12 dB Amp

CH 1

Horizontal MBA Antenna 2

CH 2

CH 3

Beam 1

12 dB Amp

CH 4

Agilent Infiniium DSO80204B

Beam 2

12 dB Amp


Feasibility experiment

Feasibility Experiment

1 [m]

H=1.7 [m]

Pos 1

Pos 2

1.8 [m]

H=2.6 [m]

2.3 [m]

H=2 [m]


The minimal system for proof of feasibility 2

The Minimal System for Proof of Feasibility(2)

Horizontal MBA Antenna 1

Version Using Power Detectors

Beam 1

Power Detector

12 dB Amp

Power Detector

Beam 2

12 dB Amp

Scope

CH 1

Horizontal MBA Antenna 2

CH 2

CH 3

Beam 1

Power Detector

12 dB Amp

CH 4

Regular Low-Frequency Scope

Beam 2

Power Detector

12 dB Amp


Antenna measurement system

Antenna Measurement System

Protractor

Rotating table

Antenna

Transmitting antenna

Pulse Generator

CH 1

CH 2

CH 3

Scope:

CH 4


Antenna measurements

Antenna Measurements

Spatial Response of MBA [ dB ]

Beam 1

Beam 2


Antenna measurements1

Antenna Measurements

Spatial Response of MBA [ dB ]

Beam 1

Beam 2


Power amplifier measurement system

Power Amplifier Measurement System

  • The 2 Outputs will be compared to measure gain


Amplifier measurements

Amplifier Measurements

Amplifier Gain vs. Frequency [ dB ]


Doron brot eyal cimet supervisor yossi hipsh

  • A Special Thanks to:

  • Yossi Hifsch Supervisor and Mentor

  • Eli Shoshan For all the Support

  • Bruriya Zochar For all the Help and Supplies

  • The Entire HS DSL Staff

Questions ?


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