Exact Error Rate Analysis for Pulsed DS-and Hybrid DS/TH-CDMA in Nakagami Fading
IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences
A real orthogonal space-time coded UWB scheme for wireless secure communications
EURASIP Journal on Wireless Communications and Networking - Special issue on wireless physical layer security
The accurate performance evaluation of time hopping UWB systems with pulse based polarity
ICHIT'06 Proceedings of the 1st international conference on Advances in hybrid information technology
Performance study of a high-rate multiuser transmitted reference ultra-wideband transceiver
MILCOM'06 Proceedings of the 2006 IEEE conference on Military communications
A UWB radio network using multiple delay capture enabled by time reversal
MILCOM'06 Proceedings of the 2006 IEEE conference on Military communications
Iterative synchronization of multiuser ultra-wideband signals
IEEE Transactions on Wireless Communications
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We consider a binary pulsed communication system, with possibly episodic transmission, i.e., the system transmits n pulses per information bit and allows for off-time separation between pulses. In the ultra-wideband (UWB) regime, such systems are motivated for overlay applications, as well as low probability of intercept and low probability of detection scenarios. Processing gain enables low-power transmission, and the UWB pulsing limits the interference effects into narrowband systems. We introduce a random ternary sequence model and use this to study multiuser system performance. We consider the issues of processing gain, jamming margin, coding gain, and multiuser interference (MUI) for a single-user matched filter receiver. The introduction of episodic transmission, with a corresponding reduction in bit rate, provides system flexibility with respect to both MUI rejection and handling multipath channels. Highly episodic transmission provides nearly orthogonal low-rate users, even with system asynchrony and no power control. Performance of a single-user RAKE receiver is evaluated via a Chernoff bound on bit error rate, in the presence of MUI. The analysis includes the impact of fading as well as pilot-aided channel estimation.