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!