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1.2 Implementation of a Demodulator

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Today s Presentation Covers. Motivation. Description of Project. Team Roles and Responsibilities. Project Progress. Plans for the 2nd semester. Today s agenda ... – PowerPoint PPT presentation

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Title: 1.2 Implementation of a Demodulator


1
1.2 Implementation of a Demodulator
  • Sponsor Steve Hicks, FlexRadio Systems
  • Faculty Advisor Dr. Harold Stern Dr. Semih
    Aslan

2
Team Members
Jonathan Rodriguez Project Manager Software
Designer
Cory Cox Software Designer Test Engineer
Nicolas Govea Software Designer Validation
Engineer
3
Todays Presentation Covers
  • Motivation
  • Description of Project
  • Team Roles and Responsibilities
  • Project Progress
  • Plans for the 2nd semester

4
Roles and Responsibilities
  • Project Manager Jonathan Rodriguez
  • Managerial Duties
  • Schedule team meetings
  • Communicate project progress with the project
    sponsor and the instructor
  • Monitor projects milestones
  • Research
  • Software defined radios
  • Error handling
  • Constraints
  • Software design
  • Configuration between devices used

5
Motivation
  • The Problem
  • Analog and digital radio operators currently can
    not communicated with each other due to
    incompatibility of communication
  • The Solution
  • By implementing System Fusion, the radio will
    automatically switch the transmit mode from
    either digital or analog based on the mode
    detected by the receiver.
  • Why is this important?
  • With the ever growing digital world, System
    Fusion Fusion bridges the gap between the analog
    past and the digital future

6
Sponsored by FlexRadio Systems
  • Why FlexRadio Systems?
  • FlexRadio currently does not have communication
    modes that support interoperability between
    analog and digital
  • Yeasu has developed System Fusion, with C4FM as
    the standard modulation technique, which solves
    this problem
  • With addition of System Fusion into their radios,
    FlexRadio can meet consumer demands of having
    many communication modes in one product
  • This allows FlexRadio to continue to be the
    industry leader in software defined radios

7
What is System Fusion and C4FM?
  • System Fusion
  • Four different communication modes
  • Full Rate Voice Mode
  • Full Rate Data Mode
  • Voice / Data Mode
  • Analog FM Mode
  • Continuous 4-Level Frequency Modulation (C4FM)
  • The standard modulation scheme used for System
    Fusion

8
Project overview
  • Goals of Project
  • Stretch Goals of Project
  • Successfully code and implement the digital
    modulation scheme C4FM.
  • implement the full rate voice mode of System
    Fusion
  • Integrate the modulation scheme and voice mode
    into FlexRadios SmartSDR software.
  • Successfully implement the other modes of System
    Fusion
  • full rate data mode
  • Voice/Data mode
  • Analog FM mode

9
Roles and Responsibilities
  • Team Member Nicolas Govea
  • Research
  • Boundary conditions
  • Use cases
  • Characteristics of C4FM
  • Performance
  • Software design
  • Demodulator
  • Validation Engineer

10
General Signal Process
  • System level diagram of the implementation of
    C4FM.
  • Everything inside the red dotted line will be
    designed and coded for this project.

11
C4Fm Characteristics
12
Project Elements
  • Modulator / Demodulator
  • All code written in c language
  • Eclipse compiler
  • GitHub repository

13
  • Why this is a good Senior Design Project
  • Implementing C4FM Modulation Scheme
  • Insight as to how signals are transmitted via
    communication devices.
  • Gain programming skills through the
    implementation of a digital modulation scheme.
  • Insight into the design process and how real
    world companies operate.
  • This project allows us to expand our skill set,
    in a way that can not be achieved in classroom
    settings

14
Major Milestones
  • Intermediate Design Review November 20, 2015
  • First Semester Report Presentation December
    2, 2015
  • Test Plan February 15, 2016
  • Characterization Report April 4, 2016
  • Final Design Review April 15, 2016
  • Final Semester Report Presentation - May 3,
    2016

15
Project Deliverables
  • Tasks to be delivered
  • Setup communication between devices
  • Write code for C4FM modulation scheme
  • Implement modulation code into SmartSDR software
  • Write code for C4FM demodulation scheme
  • Implement demodulation code into SmartSDR
    software
  • Live test system for voice mode

16
Roles and Responsibilities
  • Team Member Cory Cox
  • Research
  • Interfacing
  • System requirements
  • Existing systems
  • Performance
  • Software design
  • Modulator
  • Test Engineer

17
Constraints
  • Budgetary
  • FLEX-6700
  • STI-CS Speech Intelligibility Meter
  • Design
  • FlexRadio Signature Series radio
  • SmartSDR Software
  • Writing in C language
  • Maintainability
  • GitHub repository

18
Standards
  • System Fusion
  • Allows for automatic mode select
  • C4FM modulation scheme
  • Faster transmission rate
  • Larger bandwidth
  • FLEX Signature Series Radios
  • Code will be unique to operate with SmartSDR
    software

19
Challenges Concerns
  • Limited resources for examples of C4FM
    implementation
  • Currently only one company implements C4FM scheme
  • Configuring our code into FlexRadios SmartSDR
    software
  • Access to VHF compatible radio
  • Budget limitations for testing intelligibility of
    speech output
  • Robustness of our System

20
Project Progress
  • Research completed for
  • Software defined radios
  • System Fusion
  • C4FM modulation
  • Symbol mapping
  • Error control handling
  • Performance
  • Parts procured
  • FLEX-6300 series radio
  • ThumbDV DV3000U dongle

FLEX-6300 SDR
ThumbDV
21
2nd Semester Tasks
  • Tasks Planned for the Completion of the project
  • Configure ThumbDV dongle to computer / radio
  • Write code for modulator / demodulator
  • Implement code into FlexRadio SmartSDR software
  • Test modulation and demodulation performance
  • Perform live voice test over radios

22
Hamming it out
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