SDP 2011 Team Goeckel PDR Robert Gibb Dominic Emilian Patrick Coletti Seth Berggren

2 SDP 2011 Team Goeckel PDR Outline of Presentation  Motivation  Requirement Specifications  PDR Concerns  System Design  Measurements  Accomplishments  Future Goals

3 SDP 2011 Team Goeckel PDR 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 Motivation

4 SDP 2011 Team Goeckel PDR 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.

5 SDP 2011 Team Goeckel PDR 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 Packets HDMI Receiver

6 SDP 2011 Team Goeckel PDR 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

7 SDP 2011 Team Goeckel PDR Design Solution: Complete System Block Diagram To Router

8 SDP 2011 Team Goeckel PDR Transmitter MHz 56MHz -112MHz 112MHz 2400+TV[0:3]offset TV[0:3]offset RF Cable Baseband I/Q RF Antenna Out

9 SDP 2011 Team Goeckel PDR Design Solution: Receiver TV[0:3]offset TV[0:3]offset TV[0:3]offset 56+TV[0:3]offset-56+TV[0:3]offset Baseband I/Q RF TV In RF Antenna In

10 SDP 2011 Team Goeckel PDR 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

11 SDP 2011 Team Goeckel PDR Prototype One: Reception with Channel Change Channel Change with VCO at Tx, Synthesizer at Rx

12 SDP 2011 Team Goeckel PDR 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 Hantenna

13 SDP 2011 Team Goeckel PDR Measurements: Frequency Counter Frequency vs. Tuning Voltage Deviations from linear due to power supply (breadboard)

14 SDP 2011 Team Goeckel PDR Measurements: Spectrum Analyzer  Tuning VCO (with Spectrum Analyzer)  Power at front end and Noise Floor

15 SDP 2011 Team Goeckel PDR Measurements: Spectrum Analyzer  Measured Output of DVD Player Channel 3: -36.3dbm Channel 4: -36.3dbm Using Vtune = 4.5, recorded reception/frequency deviation Established reception with synthesizer frequency +-1MHz

16 SDP 2011 Team Goeckel PDR 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.

17 SDP 2011 Team Goeckel PDR 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

18 SDP 2011 Team Goeckel PDR 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

19 SDP 2011 Team Goeckel PDR 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

20 SDP 2011 Team Goeckel PDR Spring 2012 Gantt Chart TaskJanuaryFebruaryMarchApril Loop Filters Finalize System Noise/Power PCB Design Mount PCBs PCB Fab SPI functionality Multi – User Web Server Web – Server control of SPI Interface Casing

21 SDP 2011 Team Goeckel PDR 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

22 SDP 2011 Team Goeckel PDR Team Roles  Robert Gibb – Hardware Interfacing, Low Level Software Design  Dominic Emilian – Transmitter Design, PCB Design  Patrick Coletti – Web Server  Seth Berggren – Receiver Design