Modern devices with spread spectrum application opportunities for wireless communications services...
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Transcript of Modern devices with spread spectrum application opportunities for wireless communications services...
Oleksandr MazurenkoCEO, Covert Wireless Communications
Content
• Technologies and devices of “Covert Wireless Communications”.• Test results of new devices of the company.• Features of new devices of the company.• Opportunities and prospects of wireless communication services based
on products of the company.
Technologies. Encoding/Modulation
The main data transmission principle consists in waveforms using in form of Code Hoping CDMA. The most suitable case for this is Multichannel M-ary Bi-Orthogonal Keying original channel encoding method.(http://infotelesc.kpi.ua/article/view/47126)
Data
Key Orthogonal Sequences Set Generator
Sequence Selector
RF Frontend
Technologies. Algorithms. Encryption
Universal Orthogonal Sequences Fast Generation/Transform Algorithm Allows to decrease computational requirements and DSPU cost radically
12 GIPS (FPGA) → ↓150 times → 80 MIPS (ARM Cortex M4/7)
Allows to implement new PHY layer encryption – Parallel Streams Encr.
One binary stream (crypto analyzable)
16 parallel streams(non analyzable)
Technologies. Another issues
Analogue / Prototype techniques: IEEE 802.11b, GPS PHY layer.
Advantages:•Each next data symbol is transmitted by different orthogonal spreading sequence•Fast changing of channel encoding algorithm•Does not require other encryption techniques•Does not require outer synchronization channels•Does not require carrier signal acquiring •Allowable absolute frequency instability δf = 0,78х10-6
Devices. Parameters
Radio modem CWC_VHF 110-600MHz.
Parameters: • Frequency range, F = 110-600 (433.92) MHz, • Bandwidth, ΔF = 2 MHz, • Radiation power, S = 0 dBm,• Spread Spectrum Multiplier, М = 1024х2 (+33dB power gain),• Data rate, R = 9,6 kbps,• Maximum transmission range ~1,5 km (~0,9 mile),• Power consumption, P < 1 Watt.
Tests. Testbed
TX - Prototype CWC_VHF 110-600 MHz.RX - SDR USRP B200 + GNURadio
Tests. Results
At next dynamic figures comments are absent for better visual perception.Each figure consists of 3 part (from top to bottom): 1. RX signal time domain; 2. RX signal detector response; 3. RX signal spectrum.There are 4 figs for hidden transmission case and 3 figs for narrowband interference (FSK signal) immunity case in next order:•Primary/Reference case – signal are captured from modem ANT output;•Hidden transmission with 60dB path loss, no gain;•Hidden transmission with 60dB path loss, 60dB gain•Hidden transmission with 120dB path loss, 60dB gain•Reference case for interference immunity test, SINR = 0 dB•Signal receiving in conditions of NB interference presence, SINR ≈ -30dB•Signal receiving in conditions of NB interference presence, SINR ≈ -40dB
Tests. Hidden data transmission
Tests. Hidden data transmission
Tests. Hidden data transmission
Tests. Hidden data transmission
Tests. Narrowband interference immunity
Tests. Narrowband interference immunity
Tests. Narrowband interference immunity
New opportunities
Narrowband and wideband link simultaneous operation
Radiation power increasing in ISM bands
ΔP= 40-45dB
New opportunitiesHidden transmission between distant objects
Signal envelop is recognizable Signal spectrum is recognizable Hidden transmission
1mW <100m (330ft)<300m (1000ft)<1500m (0,9 mile)
New opportunities
Hidden transmission over short distances
Power adaptation
Р<1uW, R<100m (330 ft)
Wireless communication services
• Military communications
• Security communications
• Drones control
• Remote control
Prospects
• Spatio-temporal synchronization algorithm implementation / Code Division Duplex application
• Complex network structures realization (Mesh, Ad-hoc)• Encoder optimization / Data rate increasing• Parallel streams encryption implementation• High performance devices of 2,4GHz ISM band developing
THANK YOU!