Browsing by Keywords "Ultra-wideband (UWB)"
Now showing items 1-18 of 18
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Autonomous navigation of robotic units in mobile sensor network
(2012)This work is motivated by the problem of detecting buried anti-tank and anti-personnel mines in roads or some border regions. The problem is tried to be solved by use of small mobile robotic sensors and their some abilities ... -
A Bayesian approach to respiration rate estimation via pulse-based ultra-wideband signals
(2009)In this paper, theoretical limits on estimation of respiration rates via pulse-based ultra-wideband (UWB) signals are studied in the presence of prior information about respiration related signal parameters. First, a ... -
Coded-reference ultra-wideband systems
(2008)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 ... -
Complementary spiral resonators for ultrawideband suppression of simultaneous switching noise in high-speed circuits
(Electromagnetics Academy, 2014)In this paper, a novel concept for ultra-wideband simultaneous switching noise (SSN) mitigation in high-speed printed circuit boards (PCBs) is proposed. Using complementary spiral resonators (CSRs) etched on only a single ... -
Electrically controlled resistive switching assisted active ultra-broadband optical tunability in the infrared
(2013)We present an electrically tunable optical device with ultra-broadband tunability operating in 2-10 μm spectrum. We also, for the first time, optically observe resistive switching behavior in reflection measurements under ... -
Enhancements to threshold based range estimation for ultra-wideband systems
(IEEE Computer Society, 2014)Ultra-wideband (UWB) signals have very high time resolution, which makes them a very good candidate for range estimation based wireless positioning. Although the accuracy is the major concern for range estimation, it is ... -
Implementation of a coded-reference ultra-wideband system
(Bilkent University, 2011)Coded-reference ultra-wideband (CR UWB) systems provide orthogonalization of the reference and data signals in the code domain to facilitate communications without the need for complex channel estimation and have ... -
Interference mitigation and awareness for improved reliability
(Cambridge University Press, 2011)Wireless systems are commonly affected by interference from various sources. For example, a number of users that operate in the same wireless network can result in multiple-access interference (MAI). In addition, for ... -
Multiperson tracking with a network of ultrawideband radar sensors based on gaussian mixture PHD filters
(Institute of Electrical and Electronics Engineers Inc., 2015)In this paper, we investigate the use of Gaussian mixture probability hypothesis density filters for multiple person tracking using ultrawideband (UWB) radar sensors in an indoor environment. An experimental setup consisting ... -
Nonlinearity-tailored fiber laser technology for low-noise, ultra-wideband tunable femtosecond light generation
(OSA - The Optical Society, 2017)The emission wavelength of a laser is physically predetermined by the gain medium used. Consequently, arbitrary wavelength generation is a fundamental challenge in the science of light. Present solutions include optical ... -
Optimal and suboptimal receivers for code-multiplexed transmitted-reference ultra-wideband systems
(Wiley, 2013)In this study, optimal and suboptimal receivers are investigated for code-multiplexed transmitted-reference (CM-TR) ultra-wideband systems. First, a single-user scenario is considered, and a CM-TR system is modeled as a ... -
Performance analysis of code-multiplexed transmitted-reference ultra-wideband systems
(2011)In code-multiplexed transmitted-reference (CM-TR) ultra-wideband (UWB) systems, data signals and reference signals are transmitted using two distinct orthogonal codes. In this way, performance improvements and/or implementation ... -
Performance limits on ranging with cognitive radio
(2009)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 ... -
Receiver design and performance analysis for code-multiplexed transmitted-reference ultra-wideband systems
(Bilkent University, 2010)In transmitted-reference (TR) and frequency-shifted reference (FSR) ultrawideband (UWB) systems, data and reference signals are shifted relative to each other in time and frequency domains, respectively. The main advantage ... -
Theoretical limits and a practical estimator for joint estimation of respiration and heartbeat rates using UWB impulse radio
(2007)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 ... -
Theoretical limits for estimation of periodic movements in pulse-based UWB systems
(Institute of Electrical and Electronics Engineers, 2007)In this paper, Cramer-Rao lower bounds (CRLBs) for estimation of signal parameters related to periodically moving objects in pulse-based ultra-wideband (UWB) systems are presented. The results also apply to estimation of ... -
Two-step time of arrival estimation for pulse-based ultra-wideband systems
(SpringerOpen, 2008)In cooperative localization systems, wireless nodes need to exchange accurate position-related information such as time-of-arrival (TOA) and angle-of-arrival (AOA), in order to obtain accurate location information. One ... -
Ultra-wideband orthogonal pulse shape set design by using Hermite-Gaussian functions
(2012)Ultra-Wideband (UWB) communication systems have been developed for short distance, high data rate communications. To avoid interfering with the existing systems in the same environment, very short duration pulses used by ...
