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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

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
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
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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