Now showing items 1-10 of 28
Ultra-wideband range estimation: Theoretical limits and practical algorithms
The high time resolution of ultra-wideband (UWB) signals enables wireless devices to perform accurate range estimation. In order to realize UWB systems with accurate ranging capabilities, both theoretical limits on range ...
Theoretical limits and a practical estimator for joint estimation of respiration and heartbeat rates using UWB impulse radio
In this paper, Cramer-Rao lower bounds are derived fo r joint estimation of respiration and heartbeat rates via impulse radio ultra-wideband signals. Generic models are employed for displacement functions due to respiration ...
Performance limits on ranging with cognitive radio
Cognitive radio is a promising paradigm for efficient utilization of the radio spectrum due to its capability to sense environmental conditions and adapt its communication and localization features. In this paper, the ...
Coded-reference ultra-wideband systems
Transmitted-reference (TR) and frequency-shifted reference (FSR) ultra-wideband (UWB) systems employ pairs of reference and data signals, which are shifted in the time and frequency domains, respectively, to facilitate ...
UWB localization algorithms
(John Wiley & Sons, 2009)
Noise enhanced detection in multiple-access environments
Under certain conditions, addition of noise can enhance performance of suboptimal detectors, which is called the stochastic resonance (SR) effect. In this paper, the effects of SR are investigated for conventional detectors ...
Theoretical limits for estimation of vital signal parameters using impulse radio UWB
In this paper, Cramer-Rao lower bounds (CRLBs) for estimation of vital signal parameters, such as respiration and heart-beat rates, using ultra-wideband (UWB) pulses are derived. In addition, a simple closed-form CRLB ...
Iterative ("Turbo") multiuser detectors for impulse radio systems
(Institute of Electrical and Electronics Engineers, 2008)
In recent years, there has been a growing interest in multiple access communication systems that spread their transmitted energy over very large bandwidths. These systems, which are referred to as ultra wide-band (UWB) ...
A survey on wireless position estimation
(Springer New York LLC, 2008)
In this paper, an overview of various algorithms for wireless position estimation is presented. Although the position of a node in a wireless network can be estimated directly from the signals traveling between that node ...
Adaptation of two types of processing gains for UWB impulse radio wireless sensor networks
(The Institution of Engineering and Technology, 2007)
Ultrawideband impulse radio systems offer two kinds of processing gains that can be adapted based on the interference level in the system so that quality of service requirements are fulfilled. An adaptive assignment scheme ...