Performance analysis and comparison of time-hopping and direct-sequence UWB-MIMO systems
EURASIP Journal on Applied Signal Processing
Introduction to Space-Time Wireless Communications
Introduction to Space-Time Wireless Communications
Physical-layer secrecy in AWGN via a class of chaotic DS/SS systems: analysis and design
IEEE Transactions on Signal Processing
On the performance of episodic UWB and direct-sequence communication systems
IEEE Transactions on Wireless Communications
IEEE Transactions on Information Theory
Unitary space-time modulation for multiple-antenna communications in Rayleigh flat fading
IEEE Transactions on Information Theory
Diagonal algebraic space-time block codes
IEEE Transactions on Information Theory
Optimal space-time constellations from groups
IEEE Transactions on Information Theory
Secure space-time communication
IEEE Transactions on Information Theory
A secure and anonymous cooperative sensing protocol for cognitive radio networks
Proceedings of the 4th international conference on Security of information and networks
Wireless Personal Communications: An International Journal
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Recent research reveals that information security and information-hiding capabilities can be enhanced by proper exploitation of space-time techniques. Meanwhile, intrinsic properties of ultra-wideband (UWB) signals make it an outstanding candidate for secure applications. In this paper, we propose a space-time coding scheme for impulse radio UWB systems. A novel real orthogonal group code is designed for multi-antenna UWB signals to exploit the full spatial diversity gain and achieve the perfect communication secrecy. Its performance in a frequency-selective fading channel is analyzed. The transmission secrecy, including low probability of detection (LPD), low probability of intercept (LPI), and anti-jamming performance, is investigated, and some fundamental tradeoffs between these secrecy metrics are also addressed. A comparison of the proposed scheme with the direct sequence spread spectrum (DSSS) technique is carried out, which demonstrates that proper combination of UWB and space-time coding can provide substantial enhancement to wireless secure communications over other concurrent systems.