Towards Total Spectrum Dominance: Multi-carrier Based Cognitive Radio and Cognitive Jamming for Electronic Warfare Countermeasures

Period of Performance: 03/10/2009 - 06/30/2011


Phase 2 SBIR

Recipient Firm

Mrlets Technologies, Inc.
616 Brookmeade Ct.
Beavercreek, OH 45434
Principal Investigator


The objective of this Phase II project is to design, implement and demonstrate an innovative secure cognitive wireless communication/jamming system. This system will integrate multiple advanced signal processing, communication and electronic warfare countermeasure technologies together to create total spectrum dominance for military applications. The proposed cognitive communication/jamming system will be able to (1) provide highly secure wireless communication links for friendly transmission; (2) effectively jam and destroy hostile wireless communication; and (3) optimize the spectrum usage efficiency and minimize power consumption for portable devices. Specifically, a cooperative spectrum sensing algorithm will provide a virtual RF topology map of a hostile environment. Next, important RF parameters and localizations of hostile transmissions will be determined. With the aid of the virtual RF topology, a polyphase carrier interferometry waveform is designed to provide secure wireless communication links for intended transmission and jam hostile transmission simultaneously. A multi-carrier based non-contiguous RF watermarking technology is implemented to significantly improve the performance of the intended wireless transmission. A polyphase carrier interferometry jamming technology is implemented to effectively destroy the hostile transmission by transmitting with identical RF parameters. A smart antenna array is integrated with the RF watermarking technology and jamming technology to provide a oscillating beamforming and offer transmit diversity to provide superb performance improvement and significant jamming directionality. Most important, multiple smart antenna arrays are combined to create a virtual grid, generating a distributed, prioritized RF watermarking technology. As a direct result of these innovative research and development, the proposed wireless communication technology not only provides high performance and high security against both passive eavesdroping and active jamming from adversaries, but it eliminates hostile transmission as well. By combining secure communication for intended users and strong jamming capability towards adversaries together, we will achieve total spectrum dominance in a portable and flexible manner. In addition to theoretical and numerical analysis, the proposed cognitive wireless communication/jamming technology will also be implemented in hardware via DSP/FPGA/SDR boards to demonstrate its superb performance and exceptional security feature. BENEFIT: This high performance high security cognitive radio and cognitive jamming technology has a large potential for both military and commercial applications. While the primary DoD application is to enhance the security, reliability and jamming capability of military wireless communication and network, this technology can also bring higher security and performance to current commercial wireless communication networks. The novel spreading spectrum technology, along with the intelligent spectrum sensing technology, is capable of increasing the spectrum efficiency of ISM bands and licensed bands, offering a unique and promising solution to spectrum congestion problem facing the wireless communication industry. The RF watermarking technology can be integrated into current commercial wireless networks to significantly improve their security. Specifically, the distributed RF watermarking technology can significantly improve the security vulnerability of current IEEE 802.11a/802.11g/HyperLAN II based wireless local access networks. Other possible commercial application areas include Wireless Personal Area Network, cellular network and satellite communications. The proposed technology has already attracted interests from industry leaders such as L-3 Communications.