Robert gibb dominic emilian patrick coletti seth berggren
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Robert Gibb Dominic Emilian Patrick Coletti Seth Berggren. Outline of Presentation. Motivation Requirement Specifications PDR Concerns System Design Measurements Accomplishments Future Goals. Motivation. Current digital cable systems:

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Robert Gibb Dominic Emilian Patrick Coletti Seth Berggren

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Presentation Transcript

Robert Gibb

Dominic Emilian

Patrick Coletti

Seth Berggren

Outline of Presentation

  • Motivation

  • Requirement Specifications

  • PDR Concerns

  • System Design

  • Measurements

  • Accomplishments

  • Future Goals


  • Current digital cable systems:

    • Long, clumsy coax cable laid out throughout walls of the house are unsightly and difficult to route around your house

    • Broken coax can be difficult to replace

    • Splitting of coax cable requires additional wires

    • Awkward jack placement

    • One receiver box per TV

Requirements Specifications

  • Cost: Under $200

  • Size: Transmitter box should be 8x6x2 or smaller. Receiver will be small enough to plug right into back of TV.

  • Easy : Omni-directionally transition, simple setup, easy to use interface

  • Multiplicity: transmit separate channels to up to four different TVs.

  • Security: Password protected user accounts on server, parental control

  • Legality: YES, OUI, CI

  • Ability: work at distances up to 150 feet.

Analog vs. Digital

  • Why should we implement with analog schemes rather than routing cable signal digitally?

    • Already in original form

    • Cuts down on hardware, already QAM tuner in TV

    • Digital system would involve constructing digital tuner

  • QAM tuner will directly decode incoming signal




White Spaces

  • Potentially utilize white spaces in the future

    • White Spaces Coalition allows unlicensed access to no longer used analog TV spectrum

    • Devices detect unallocated range of spectrum and utilize frequency spectrum in these ranges

Design Solution: Complete System Block Diagram

To Router


Baseband I/Q


RF Cable

RF Antenna Out














Design Solution: Receiver





RF Antenna In

Baseband I/Q










Feasibility Study: RF Link Budget

  • RF Link Budget (Transmitter Power Required)

    • Ptx = Prx – Gtx –Grx + Lfs +Lm

      • Antenna Gain: Gtx, Grx = 6dBi

      • Free Space Loss: Lfs = 20log(4pi*D*f/c) = 73dB

      • Fade Margin: Lm = 30dB max

        Ptx < 30dbm

        Prx = Noise Floor + NF_rx + SNR = -113dbm + 2.6dB + 35dB

        Ptx = -113dbm + 2.6dB +35dbm - 6dbi – 6dbi + 73dB +30db = 15.6 dbm

Many calculators already available

Prototype One: Reception with Channel Change

  • Channel Change with VCO at Tx, Synthesizer at Rx

Initial Problems with Prototype One

  • Wireless System was noisy

    • Antenna bandwidth?

    • Phase Noise?

    • Cable input (-36dbm) too low?

  • Several things to try: power amplifier, phase-locked loop, shift

  • Vestigial sidebands out of antenna attenuation range


Measurements: Frequency Counter

  • Frequency vs. Tuning Voltage

  • Deviations from linear due to power supply (breadboard)

Measurements: Spectrum Analyzer

  • Tuning VCO (with Spectrum Analyzer)

  • Power at front end and Noise Floor

Measurements: Spectrum Analyzer

  • Measured Output of DVD Player

    • Channel 3: 55.5MHz @ -36.3dbm

    • Channel 4: 60.866MHz @ -36.3dbm

  • Using Vtune = 4.5, recorded reception/frequency deviation

  • Established reception with synthesizer frequency +-1MHz

Review MDR Specs

  • From PDR, we said we would have:

    • Established access to all available channels for one TV

    • Established a working interface between BeagleBoard and MCU to select a given cable channel.

      • New MCU already contains the functionality of BeagleBoard - don't need it

      • No need for an interface either

  • After PDR, new goals were created

    • Establish access to all available channels for one TV

    • Establish working SPI connection with Evaluation Board and a slave device

    • Ensure HTML hosting functionality.

Prototype One: MDR Demonstration

  • Added:

    • Phase-Locked 2.4GHz Local Oscillator at transmitter

    • Power amplifier prior to transmitter IF input

    • Reception clear

    • Proof of concept achieved

EVK1100 Functionality

  • Using a static IP, one can connect to hosted Web page

    • Can monitor different actuators on the board

    • Can control board peripherals

Web Server

PCB Design

  • PCB Fabrication

    • EAGLE Layout Editor to create custom printed circuit boards for design

    • Design parts in EAGLE: ADRF6806, MAX2831, ADL5386

    • Transmitter: 1PCB

    • Receiver: 4 separate PCBs

Spring 2012 Gantt Chart

Comprehensive Design Review

  • Things to get started on right away

    • Completing PCB Design and having sent out for fabrication

    • Get Web server to control SPI port and send commands

    • Allow multiple users to access website via DHCP

  • By CDR we will have:

    • Implemented analog transmitter and analog receiver units with custom PCBs

    • A fully functional multi-user web host with full control over SPI communications

Team Roles

  • Robert Gibb – Hardware Interfacing, Low Level Software Design

  • Dominic Emilian – Transmitter Design, PCB Design

  • Patrick Coletti – Web Server

  • Seth Berggren – Receiver Design

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