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14432 Albemarle Point Place • Chantilly VA 20151 • Phone (703) 488-2555 • Fax (703) 488-2555 • www.avtec.com PowerPoint PPT Presentation


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14432 Albemarle Point Place • Chantilly VA 20151 • Phone (703) 488-2555 • Fax (703) 488-2555 • www.avtec.com . EMWIN S/W Receiver April 27, 2004. Presentation Agenda. EMWIN System Introduction EMWIN Demodulator Software Overview System Requirements Installation Instructions Overview

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14432 Albemarle Point Place • Chantilly VA 20151 • Phone (703) 488-2555 • Fax (703) 488-2555 • www.avtec.com

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14432 albemarle point place chantilly va 20151 phone 703 488 2555 fax 703 488 2555 avtec

14432 Albemarle Point Place • Chantilly VA 20151 • Phone (703) 488-2555 • Fax (703) 488-2555 • www.avtec.com

EMWIN S/W Receiver

April 27, 2004


Presentation agenda

Presentation Agenda

  • EMWIN System Introduction

  • EMWIN Demodulator Software Overview

  • System Requirements

  • Installation Instructions Overview

  • Prototype Demonstration

  • On-going Work / Potential Upgrades


Emwin n s w receiver introduction

EMWIN-N S/W Receiver Introduction

  • S/W Demodulation, Bit-Synchronization

  • CCSDS Concatenated R-S + Convolution, Bitstream Service

  • Signal must be acquired for coding gain to apply

  • EMWIN-N Reduced TX Power Performance Goals

    • 3 dB Margin with 1 meter antenna @ 5 degree elevation

    • BER 10-6 @ 5 degree elevation

  • Implementation Goals

    • Support EMWIN-I Series FSK & EMWIN-N Series BPSK

    • S/W Loading < 25% CPU (1 GHz P4)

    • Re-use Antenna & RF components

    • Additional H/W costs < $300

  • Current Test Results

    • 4.5 dB Margin with 1 meter antenna @ 5 degree elevation achievable

    • Link Margin enough to support transition to 2x data rate & QPSK


Emwin receiver architecture

EMWIN Receiver Architecture


Emwin demodulator software overview

EMWIN Demodulator Software Overview


System requirements

System Requirements


Installation overview

Installation Overview

  • Download S/W and Manuals from NWS

  • Antenna / LNB Amplifier

  • IF Adapter

  • Consumer PC / Sound card / Serial card

  • EMWIN Demodulator

  • EMWIN data processing & display S/W


A antenna lnb amplifier

(a) Antenna/LNB Amplifier

  • Assemble the dish and position the antenna.

  • Connect the LNB to the antenna.


B if adapter

(b) IF Adapter

  • Construct or Purchase UHF/VHF Frequency Adapter.

  • Connectorized component version. Surface/through hole

  • schematic available.


B uhf vhf frequency adapter cont

(b) UHF/VHF Frequency Adapter (cont.)

  • Connect the UHF/VHF Frequency adapter to the LNB using an SMA or appropriate RF cable. Note –60 dBm maximum input for the reference design.

  • Connect the adapter to an A/D or soundcard when installed. If using the Avtec Data Source Service, channel 0 of the soundcard must be used at this time.

  • Connect the power supply to the rear power jack.

  • Turn on the DC BIAS for the adapter.

  • Turn main power on.


C consumer pc sound card serial card

(c) Consumer PC / Sound Card / Serial Card

  • Install Windows 2000 or XP and corresponding service packs on PC if not already pre-installed.

  • Install Sound card or A/D converter.

  • Install Serial expansion card if the PC does not contain two RS-232 com ports and connect loop back cable.

  • Login to the system as the local administrator and install necessary device drivers. Insure TCP/IP Protocol stack is active.


C consumer pc sound card serial card cont

(c) Consumer PC / Sound Card / Serial Card (cont.)

  • Configure the A/D or Sound card and test operation by recording and playing audio.


C consumer pc sound card serial card cont1

(c) Consumer PC / Sound Card / Serial Card (cont.)

  • Configure the Serial card if necessary. Test using HyperTerminal.


D emwin demodulator

(d) EMWIN Demodulator

  • Unpack the archived EMWINSetup.exe to a temporary directory and verify.

  • Initiate EMWIN installer.


D emwin demodulator cont

(d) EMWIN Demodulator (cont.)

17. Review and acknowledge the welcome screen.

18. Review and acknowledge the license agreement.


D emwin demodulator cont1

(d) EMWIN Demodulator (cont.)

19. Review and acknowledge the information screen.

20. Select program location.


D emwin demodulator cont2

(d) EMWIN Demodulator (cont.)

21. Select the installation type.

22. Select icon access location.


D emwin demodulator cont3

(d) EMWIN Demodulator (cont.)

  • 23. Install EMWIN Demodulator Services.

  • 24. Reboot the PC.

  • 25. Verify EMWIN Data Source and Demodulator Service are active.

    • Select START->EMWIN Demodulator->EMWIN Config.

    • Select Data Source Service Tab and note activity icon.

    • Select Demodulator Service Tab and note activity icon.


D emwin demodulator cont4

(d) EMWIN Demodulator (cont.)

  • Pertinent Data Source Parameters:

  • Input Device – Selects the desired sound card.

  • Input Gain – Selects the sound card gain value.

  • Data range is between -32768 and 32768.

  • TCP Port Number – Selects a valid TCP/IP Port.

  • Port range is between 1 to 65535.

  • Avoid system reserved ports.


D emwin demodulator cont5

(d) EMWIN Demodulator (cont.)

Pertinent Demodulator Parameters:

Data Source Host – IP address that the Data Source Service resides at. IP address 127.0.0.1 represents the local systems address.

Signal Format – Selects between EMWIN I (0) or EMWIN N (1).

COM Port Number – Defines the desired COM port to write out for the EMWIN display software.

TCP Port Number – Selects a valid TCP/IP Port. Must match the Data Source Service assigned port address.


D emwin demodulator cont6

(d) EMWIN Demodulator (cont.)

Pertinent FSK Demodulator Parameters:

Sample Rate – The sample rate will be 96 KHz for the sound card solution.

Signal Present Threshold – The threshold which used to indicate whether a valid signal is present.

AGC Gain – The gain bandwidth setting value that corresponds to about a 10 Hz bandwidth at the given input sample rate.

Tuner Frequency – Initial tuner frequency that represents the frequency as seen by the A/D converter. The nominal center frequency has been designed for approximately 25 KHz.


D emwin demodulator cont7

(d) EMWIN Demodulator (cont.)

Pertinent FSK Symbol Parameters:

Symbol Rate – Specifies the number of symbols that are transmitted in one second. EMWIN I requires a symbol rate of 9600.

Error Threshold – Maximum allowable number of errors before the demodulator symbol tracker is reset.


D emwin demodulator cont8

(d) EMWIN Demodulator (cont.)

Pertinent BPSK Demodulator Parameters:

Sample Rate – The sample rate will be 96 KHz for the sound card solution.

Signal Present Threshold – The threshold which used to indicate whether a valid signal is present.

AGC Gain – The gain bandwidth setting value.

Tuner Frequency – Initial tuner frequency that represents the frequency as seen by the A/D converter.


D emwin demodulator cont9

(d) EMWIN Demodulator (cont.)

Pertinent BPSK Symbol Parameters:

Symbol Rate – Specifies the number of symbols that are transmitted in one second. EMWIN I requires a symbol rate of 22000.

Error Threshold – Maximum allowable number of errors before the demodulator symbol tracker is reset.


E cots emwin s w

(e) COTS EMWIN S/W

26. Install EMWIN data processing & display S/W. Register license.

27. Start EMWIN S/W, configure serial com ports (if used) and file repository.

28. Start EMWIN Ingest and process EMWIN service products.


Ongoing efforts

Ongoing Efforts

  • De-Couple RX layer from Coding layer

    • Allows use of RX function only, or decoder only

  • Provide example application that interfaces with the EMWIN S/W RX

    • Example S/W that allows users/vendors to build on-top of S/W RX

    • Control and monitor examples, indicates receiver performance

    • Available in 1-2 Weeks

  • Modify EMWIN S/W RX to allow use with “lower performance” Sound Cards

    • Use both L & R channels

    • Minimal (< $15 in components) changes to IF Adapter H/W design

    • I&Q Recombination in S/W

  • Higher data rate options

    • QPSK

    • CCSDS Turbo Convolution Codes

    • Low Density Parity Check


Questions

Questions?


Backup s w demod bitsync block diagram

Backup - S/W Demod BitSync Block Diagram

A/D

I & Q used to simplify tracking


Backup software fsk demod bitsync module

Backup - Software FSK Demod/Bitsync Module

  • Acquires data from TCP socket connection

  • Required for EMWIN-I reception and decoding


Backup bit synchronizer and matched filter

Backup - Bit Synchronizer and Matched Filter

  • Performs bit clock recovery and soft symbols for PSK and BPSK signals

  • Outputs Soft symbols to second processor through Global Memory


Backup frame synch and bit decoding

Backup - Frame Synch and Bit Decoding

  • Soft symbols are input from Demod BitSync

  • If required, Viterbi decoding is performed followed by a frame synchronizer function

  • Application software is not a deliverable item, but if supplied GFE will be included


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