Robert gibb dominic emilian patrick coletti seth berggren
1 / 22

Robert Gibb Dominic Emilian Patrick Coletti Seth Berggren - PowerPoint PPT Presentation

  • Uploaded on

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:

I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
Download Presentation

PowerPoint Slideshow about ' Robert Gibb Dominic Emilian Patrick Coletti Seth Berggren' - penn

An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.

- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
Robert gibb dominic emilian patrick coletti seth berggren

Robert Gibb

Dominic Emilian

Patrick Coletti

Seth Berggren

Outline of presentation
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
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


Baseband I/Q


RF Cable

RF Antenna Out














Design solution receiver
Design Solution: Receiver





RF Antenna In

Baseband I/Q










Feasibility study rf link budget
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
Prototype One: Reception with Channel Change

  • Channel Change with VCO at Tx, Synthesizer at Rx

Initial problems with prototype one
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
Measurements: Frequency Counter

  • Frequency vs. Tuning Voltage

  • Deviations from linear due to power supply (breadboard)

Measurements spectrum analyzer
Measurements: Spectrum Analyzer

  • Tuning VCO (with Spectrum Analyzer)

  • Power at front end and Noise Floor

Measurements spectrum analyzer1
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
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
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
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 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

Comprehensive design review
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
Team Roles

  • Robert Gibb – Hardware Interfacing, Low Level Software Design

  • Dominic Emilian – Transmitter Design, PCB Design

  • Patrick Coletti – Web Server

  • Seth Berggren – Receiver Design