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Motivated by the need for robust and high throughput communication with airborne platforms, a variable rate MIMO scheme that combines the D-BLAST architecture with per antenna spreading was proposed. This paper is focused on the experimental study of this approach. We developed a software defined radio implementation of the variable rate MIMO system based on GNU Radio. Over the air transmission and...
Motivated by the primary user emulation attack in cognitive radios, this paper develops a physical layer user authentication scheme for wireless systems. The developed scheme consists of two stages: 1) one-way hash function for generating authentication tags and 2) physical layer tag embedding via controlled constellation perturbation. A detailed tradeoff analysis is provided that balances the performance...
This paper describes a simple software radio design approach to communication and spectrum access in a system without user coordination. The work is a result of our recent participation in the DARPA Spectrum Challenge that provides a venue for head-to-head competitions of software radio designs from teams around the country. Two modes of operations are involved, one is competitive and the other cooperative;...
The prevalent use of unmanned vehicles in military and civilian applications requires the existence of robust and high throughput communication with airborne platforms. Real channel measurements are conducted and the analysis supports the use of MIMO communications for such applications due to its potential throughput advantage. Unique challenges and the ways to address them are described in detail...
This paper develops a physical layer user authentication scheme for wireless systems. The approach can be used as an effective counter measure against the primary user emulation attack in cognitive radios. The developed scheme applies to general digital constellations and we establish its optimality in terms of error probability for user authentication. Trade-off analysis is provided that balances...
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