Covert Wireless Communications

hidden, secure, reliable …

Application areas Secure communications / Military communications / UAV control & telemetry systems / Wireless sensor network

Assignments • Signal hiding below noise level (-12/-24dB +digital noise supress.) • Electronic countermeasures resistance providing (~30dB).

Performances

At bandwidth of ΔF = 1MHz

Data Rate R, kbps Link Power Gain W, dB ~9,7 30

~10,7 27 ~21,4 24

Advantages over analogues / prototypes Analogue / Prototype techniques: IEEE 802.11b, GPS. Advantages: • Each next data symbol is transmitted by different orthogonal

spreading sequence • Fast changing of channel coding 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

Current project state Completed steps • MATLAB simulation software is developed • Prototype on basis of SDR USRP2 (N210) is realized (+GNURadio) Current steps: • Hardware making • Code transforming to VHDL for FPGA and С/С++ for DSP

Working prototype

Real signal transmission

Final Product

Potentials, capabilities Capabilities: • Resistance to all known ECM systems • Hiding signal transmission in 90% of covered area • Data rates up to SD video 360p H.264. (20MHz BW)

Potential improvements: • Synchronization algorithms • Orthogonal spreading sequences • Fast orthogonal transform algorithms

see you at

MAKEITSHOW

festival of innovation

27-28 JUNE 2015

http://makeitshow.com.ua