Wideband HF Data Over-the-Air Testing
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1 Wideband HF Data Over-the-Air Testing Rod Blocksome Rockwell Collins, Inc. Feb. 4, 2010
2 Topics Test Station Particulars Test Results To Date Future OTA Testing
3 Test Station Particulars Received FCC Special Temporary Authority (STA) Experimental Call Sign: WE9XAA 29 frequencies authorized; 12 khz Bandwidth 3.1 to 14.5 MHz 6 Months Licensed for three locations: Cedar Rapids, Iowa Oxford Junction, Iowa Richardson, Texas Sites chosen to test propagation modes: Ground Wave (Cedar Rapids & Oxford Junction) NVIS (Cedar Rapids & Oxford Junction) 1-hop Skywave (Richardson to either CR or OJ)
4 Cedar Rapids, IA Lab 13 HF Station
5 Oxford Junction, IA HF Station
6 Ricardson, TX HF Station
7 HF-80 1kW HF Radios
8 Rockwell Collins MDM-Q9604 Modem
9 RCI OTA HF Test Links CR OJ Richardson
10
11
12 Test Station Particulars Modified HF-80 1kW Transmitters & Receivers Installed 12.0 khz wide IF filters Disabled Audio Compression feature Modified MDM-Q9604 Modem Installed Prototype WBHF Waveforms for 6 and 12 khz BW
13 Modulation Particulars 12 khz BW; 9600 sym/sec Modulation Data Mini-Probe Block Size Code Rate Bit Rate kbps 256 QAM / QAM / QAM / QAM / QAM / PSK / QPSK / BPSK /4 6.4 BPSK /3 4.8 BPSK /3 2.4 BPSK /4 1.2 BPSK /8 0.6
14 Test Station Particulars Modified MDM-Q9604 Modem (continued): Diversity Transmission and Reception Included Comparison of Ground Wave in Iowa with Sea Wave over the Ocean: Iowa: 63 km path = db Basic Path Loss at 3171 khz Ocean: 63 km path = db Basic Path Loss at 3171 khz Ocean: 696 Km path = db Basic Path Loss at 3171 khz The Iowa Ground Wave Path Loss is the same as Sea Wave over a distance of 433 miles! A 200 nm sea wave path would have db Basic Path Loss The signal would be 21.5 db stronger on a 200 nm path on the ocean than it is on the 63 km path over Iowa soil.
15 Ground Wave Link Analysis, 3171 khz Lab 13 Tx Avg. Power (180W): dbm Coupler + Coax Loss: -1 db Antenna Gain: +5 dbi 63 km path loss: db (GRWAVE) OJ Rx Antenna Gain: +5 dbi OJ Coax Loss: -0.5 db Receive Signal (calc.): dbm Rural Noise Model (12 khz): -79 dbm Modeled SNR: 12.8 db Measured SNR: 16 to 18 db (Modem) Measured SNR: 11 to 15 db (HF Receiver)
16 Test Results To Date Ground Wave Propagation between Cedar Rapids and Oxford Junction Cedar Rapids HF Station Particulars Antenna: 35-ft. Whip and Antenna Coupler on metal roof building Radio: Modified HF-80 1kW Transmitter and Receiver Modem: Modified MDM-Q9604 Oxford Junction HF Station Particulars Antenna: CMV-330 Vertical Monopole Radio: Modified HF-80 1kW Transmitter and Receiver Modem: Modified MDM-Q9604 Diversity Reception Cedar Rapids Transmit only Oxford Junction Receive only Two Receivers Two CMV-330 Antennas separated by approximately 1,000 feet
17 Data Rate Comparison CR Tx; OJ Rx; WBHF; 12 khz; 3171 khz UTC Date/Time 27/ / / / /1533 Data Rate Kbps Interleaver Modem / / / +15 SNR (db) Data Blocks 4,000 4,000 No Sync 4,100 10,000 BER No errors 2.1 x x x 10-4
18 1.0E E BER 1.0E E Data Rate
19 Interleaver Comparison CR Tx; OJ Rx; WBHF; 12 khz; 3171 khz UTC Date/Time 28/ / / /1755 Data Rate Kbps Interleaver Long Very Long Short Very Short Modem SNR (db) Data Blocks 7,000 10,000 4,000 4,100 BER 2.9 x x x x 10-3
20 1.0E-02 L VS S 1.0E-03 BER 1.0E E Interleaver; 25.6 kbps
21 Diversity Reception Comparison CR Tx; OJ Rx; WBHF; 12 khz; 3171 khz UTC Date/Time 29/ / / / /1854 Receiver Rx3 & Rx4 Rx4 Rx3 & Rx4 Rx3 Rx4 Data Rate Kbps Interleaver Modem +16 / / / / +13 SNR (db) Data Blocks 10,000 7,276 10,000 6,800 6,643 BER 4.8 x x x x x 10-4
22 1.0E-02 Rx 3 1.0E-03 Rx 4 Rx 4 BER 1.0E-04 Div Div 1.0E Space Diversity/Single Receiver; 19.2
23 Diversity Data Rate Comparison CR Tx; OJ Rx; WBHF; 12 khz; 3171 khz UTC Date/Time 29/ / / / /2030 Receiver Rx3 & Rx4 Rx3 & Rx4 Rx3 & Rx4 Rx3 & Rx4 Rx3 & Rx4 Data Rate Kbps Interleaver Modem +15 / / No Sync No Sync SNR (db) Data Blocks 15,000 8,000 10,000 BER 3.4 x x x 10-4
24 1.0E E-03 BER E E Divesity for Data Rates
25 Diversity STANAG 4539 Comparison CR Tx; OJ Rx; S4539; 3 khz; 3171 khz UTC Date/Time 29/ / /2154 Receiver Rx3 & Rx4 Rx4 Rx3 Data Rate Kbps Interleaver Modem +19 / / / +20 SNR (db) Data Blocks 5,000 3,000 3,000 BER 3.4 x x x 10-4
26 1.0E E-03 Rx 3 Rx 4 BER 1.0E-04 Div 1.0E Diversity; STANAG 4539, 9.6
27 Future OTA Testing Immediate phase: NVIS testing between CR and OJ Sky Wave testing between Richardson, TX and CR/OJ Include Diversity Reception tests Improvements to waveform design ARQ links Future Phases Include: Sea Wave Tests Further waveform refinements Interoperability OTA testing with Harris and NMSU Rochester, NY Melbourne, FL Las Cruces, NM Richardson, TX Cedar Rapids, IA Oxford Junction, IA
28 Future Interoperability HF OTA Test Links Harris RCI NMSU RCI Harris
29 The End
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