14432 albemarle point place chantilly va 20151 phone (703) 488-2555 fax (703) 488-2555 emwin s/w...
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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
2
Presentation AgendaPresentation Agenda
• EMWIN System Introduction• EMWIN Demodulator Software Overview• System Requirements• Installation Instructions Overview• Prototype Demonstration• On-going Work / Potential Upgrades
3
EMWIN-N S/W Receiver IntroductionEMWIN-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
4
EMWIN Receiver ArchitectureEMWIN Receiver Architecture
Consumer PC 1GHz or more(Windows NT/2000/XP)
LegendLegend
Hardware
Software
5
EMWIN Demodulator Software OverviewEMWIN Demodulator Software Overview
ViterbiDecoder
Reed-SolomonDecoder
FrameSynchronizer
RS-232
V.35Descrambler
Demodulator
DemodControl
DemodStatus
BitSynchronizer
Bit SyncControl
Bit SyncStatus
FrameSynchronizer
A/D Interface
A/DControl
A/DStatus
A/DI/O
DecoderStatus
DecoderControl
Decoder
User Provided ifDifferent A/D
Hardware Used
User Provided ifDifferent A/D
Hardware Used
EMWIN Data Source EMWIN Demodulator
6
System RequirementsSystem Requirements
Items Recommended Minimum Requirements
Prototype Implementation
Antenna 1 meter dish Anderson P4 1.2 meter antenna
LNB Amplifier
1691 MHz to 137.5 MHz Downconverter
BER of [10-6] from the GOES satellite at elevation angles greater that [5] degrees
Quorum ESD/HG-1691.0-137.5 L Band Downconverter (4/27 Demo uses a Wilmanco Feed/LNB)
UHF/VHF Frequency Converter
137.5 MHz to 24 KHz Adapter
Circuit Provided ($200 in parts)
Consumer PC
1 GHz Pentium 4 Microsoft Windows
2000 or XP 10 Mbytes storage 128 Mbytes of RAM
for Windows 2000 and 256 Mbytes of RAM for Windows XP
Ethernet Driver
COTS Desktop IBM (2 serial Com Ports: to demonstrate compatibility with existing EMWIN S/W)
A/D or Sound card
> 96 ksps Sample 45 KHz BW @ 3dB
point 16 or 8 bit 2’s
complement data Conforms to
Microsoft Windows Multimedia Interface
M-Audio Audiophile 2496
7
Installation OverviewInstallation 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
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(a) Antenna/LNB Amplifier(a) Antenna/LNB Amplifier
1. Assemble the dish and position the antenna.
2. Connect the LNB to the antenna.
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(b) IF Adapter(b) IF Adapter
3. Construct or Purchase UHF/VHF Frequency Adapter. Connectorized component version. Surface/through hole schematic available.
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(b) UHF/VHF Frequency Adapter (cont.)(b) UHF/VHF Frequency Adapter (cont.)
O
I
O
I
D isconnected PinsPower Indicator
Power
IF OutputDC Bias+15VDC
RF Input-60 dBm
PowerInput
24VDC
F r o n t
B a c k
4. 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.
5. 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.
6. Connect the power supply to the rear power jack.
7. Turn on the DC BIAS for the adapter.
8. Turn main power on.
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(c) Consumer PC / Sound Card / Serial Card(c) Consumer PC / Sound Card / Serial Card
M-Audio Audiophile 2496Channel 0
SIIG Cyberseria l Dual PCI
C O M 4 C O M 3
9. Install Windows 2000 or XP and corresponding service packs on PC if not already pre-installed.
10. Install Sound card or A/D converter.
11. Install Serial expansion card if the PC does not contain two RS-232 com ports and connect loop back cable.
12. Login to the system as the local administrator and install necessary device drivers. Insure TCP/IP Protocol stack is active.
12
(c) Consumer PC / Sound Card / Serial Card (cont.)
(c) Consumer PC / Sound Card / Serial Card (cont.)
13.Configure the A/D or Sound card and test operation by recording and playing audio.
13
(c) Consumer PC / Sound Card / Serial Card (cont.)
(c) Consumer PC / Sound Card / Serial Card (cont.)
14.Configure the Serial card if necessary. Test using HyperTerminal.
14
(d) EMWIN Demodulator(d) EMWIN Demodulator
15. Unpack the archived EMWINSetup.exe to a temporary directory and verify.
16. Initiate EMWIN installer.
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(d) EMWIN Demodulator (cont.)(d) EMWIN Demodulator (cont.)
17. Review and acknowledge the welcome screen.
18. Review and acknowledge the license agreement.
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(d) EMWIN Demodulator (cont.)(d) EMWIN Demodulator (cont.)
19. Review and acknowledge the information screen.
20. Select program location.
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(d) EMWIN Demodulator (cont.)(d) EMWIN Demodulator (cont.)
21. Select the installation type.
22. Select icon access location.
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(d) EMWIN Demodulator (cont.)(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.
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(d) EMWIN Demodulator (cont.)(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.
20
(d) EMWIN Demodulator (cont.)(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.
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(d) EMWIN Demodulator (cont.)(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.
22
(d) EMWIN Demodulator (cont.)(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.
23
(d) EMWIN Demodulator (cont.)(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.
24
(d) EMWIN Demodulator (cont.)(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.
25
(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.
26
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
27
Questions?Questions?
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Backup - S/W Demod BitSync Block DiagramBackup - S/W Demod BitSync Block Diagram
A/D
I & Q used to simplify tracking
Level Detect/External IF AGC
Control
ComplexMultiplier
In Phase
Quadrature
NumericallyControlledOscillator
I
Q
LoopFilter
Low Pass FIRFilter/
Decimator
Low Pass FIRFilter/
Decimator
LevelDetect
Sample RateControl
Carrier TrackControl Carrier ACQ/TRK
Loop FilterLock Detect
LevelDetect
LoopFilter
CartesianTo Polar
Integrate/Dump
Integrate/Dump
Symbol PhaseError Detect
SymbolTracking Loop
Filter
Magnitude
Phase
Slicer
RRCFilter
RRCFilter
InputSamples
Demod BitSync Logic
Generalized1:2 to 2:1resampler
SoftSymbol
Out
Decision DirectedPhase Error
Detector
Viterbi/TurboDecoder
ExpectedDoppler
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Backup - Software FSK Demod/Bitsync Module
Backup - Software FSK Demod/Bitsync Module
Delay
HilbertTransformer
A/DSamples
NumericallyControlledOscillator
ComplexMultiplier
AGCLoopFilter
LevelDetect
FrequencyDetector
I
Q
AFCLoopFilter
LockDetect
SymbolPhase Detect
SymbolTracking
Loop Filter
Resampler
IntegrateAnd Dump
IntegrateAnd Dump
CartesianTo Polar Magnitude
Phase
V.35Descrambler
Symbols Out
• Acquires data from TCP socket connection• Required for EMWIN-I reception and decoding
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Backup - Bit Synchronizer and Matched Filter
Backup - Bit Synchronizer and Matched Filter
Input Data Resampler
SymbolTracking
Loop Filter
MatchedFilter
Symbol ErrorDetector
Slicer/SoftSymbol Out
Buffer 0
Buffer 1
GlobalMemory
To UserApplication
• Performs bit clock recovery and soft symbols for PSK and BPSK signals
• Outputs Soft symbols to second processor through Global Memory
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Backup - Frame Synch and Bit DecodingBackup - Frame Synch and Bit Decoding
Buffer 0
Buffer 1
GlobalMemory
SoftSymbols
ViterbiDecoder
Reed-SolomonDecoder
FrameSynchronizer
ViewerSoftware
(GFE)
Decoder options dependupon received data formats
• 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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