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With the rise of Global Navigation Satellite Systems (GNSSes), accurate outdoor localization has become a widely-used service in our daily lives. Yet, most indoor localization systems are not able to deliver a similar performance due to typical multipath environments causing scattering and diffraction of the received signal. Depending on the amplitudes, phases, and delays of the multipath components,...
Sampling is a well-known workload reduction technique that allows one to speed up architectural simulation while accurately predicting performance. Previous sampling methods have been shown to accurately predict single-threaded application runtime based on its overall IPC. However, these previous approaches are unsuitable for general multi-threaded applications, for which IPC is not a good proxy for...
A common practice for reducing synchronization overheads in parallel simulation of a large-scale cluster is to relax synchronization with lengthened synchronous steps. However, as a side effect, simulation accuracy degrades considerably. This paper proposes a novel mechanism that keeps the running speeds of different nodes consistent by synchronizing logical clocks with the wall clock periodically...
Radio interferometric positioning systems (RIPS) are recently proposed for low-complexity and high-accuracy localization. However, the original RIPS involves four nodes (two transmitters and two receivers) for a ranging session, and requires stringent time synchronization upon two receivers. In this paper, an asynchronous radio interferometric positioning system (ARIPS) is developed with larger positioning...
Testing of radio frequency (RF) components such as mixers, amplifiers and voltage controlled oscillators (VCO) traditionally relies on the ability to accurately estimate the device characteristics using down conversion or undersampling based test setups. Efficient and accurate acquisition of the modulating signal either requires a phase locked local oscillator signal or is limited in accuracy. This...
This paper provides a summary of the IEEE C37.238-2011 standard, which specifies a subset of PTP parameters and options to provide global time availability, device interoperability, and failure management. This set of PTP parameters and options allows IEEE 1588-based time synchronization to be used in mission critical power system protection, control, automation, and data communication applications...
This paper describes an approach to master/slave network synchronization based on bidirectional message exchanges without the use of timestamps. Rather than the usual approach of exchanging digital timestamps through a dedicated synchronization protocol, an approach is described in which synchronization information is conveyed implicitly at the physical layer through the timing of the master node??s...
Swarm navigation systems are emerging technique to investigate unknown environment. Organizing the access of shared radio channel is one of the main challenges due to the massive number of anarchical agents and the crucial mission requirements, e.g. update-rate and position accuracy. In this paper, we design a radio-based swarm navigation system and propose a pulse-coupled oscillators (PCO)-based...
In this paper we present a prototype location estimation system which uses Time Difference of Arrival. The system consists of five low cost sensors that are synchronized using GPS time stamps. The sensors were installed on the rooftops of the university campus. The system is based on software defined radios which enable receiving signals with different carrier frequencies and sampling rates with the...
Dropbox, a popular cloud storage provider, pose several threats especially in terms of file security and unauthorized access. An Android and a web application which implemented Serpent cryptographic algorithm and One-Time Password (OTP) mechanism to secure files on Dropbox and a web application was built as a solution by utilizing Dropbox Application Programming Interface (API) and Bouncy Castle library...
The high level of heterogeneity of modern embedded systems forces designers to use different formalisms, thus making reuse and integration very difficult tasks. Reducing such an heterogeneity to a homogeneous implementation is a key solution to allow both simulation and validation of the system. This paper proposes two novel flows to gain a C++ and a SystemC-AMS homogeneous implementations of starting...
The paper describes a new approach in sound intensity measurement. Nowadays sound intensity has become a popular parameter which describes the sound field. Current methods which lead to sound intensity are generally based on two microphone probes or hot wire anemometry. Using the double microphone approach involves some problems with matching of the used transducers. Where the measured phenomena are...
We propose a time and frequency synchronized λ-tunable WDM/TDM-PON with a synchronization method using timestamps. We clarify requirements of synchronization accuracy for mobile backhaul networks numerically and confirm its feasibility experimentally.
Localizability and accuracy are two fundamental problems in many range-based localization schemes for sensor networks. This poster addresses the two problems theoretically by introducing two new concepts: the effective degree and the lower bound of geometric dilution of precision (GDOP). We prove that the network is not localizable unless the average effective degree is greater than or equal to the...
Testbeds are indispensable for debugging and evaluating wireless embedded systems. While existing testbeds provide ample opportunities for realistic, large-scale experiments, they are limited in their ability to closely observe and control the distributed operation of resource-constrained nodes—access to the nodes is restricted to the serial port. This paper presents FlockLab, a testbed that overcomes...
Brain computer interface (BCI) is expected to provide powerful help for disabled in communication with caregivers. Although many BCI systems have been developed, it is still difficult for severely disabled to use the BCIs due to strict limitations of motor function including facial and eye movement. The present study aimed at developing a novel binary class of BCI based on the steady-state visual...
Empirical evidence shows that massive data sets have rarely (if ever) a stationary underlying distribution. To obtain meaningful classification models, partitioning data into different concepts is required as an inherent part of learning. However, existing state-of-the-art approaches to concept drift detection work only sequentially (i.e. in a non-parallel fashion) which is a serious scalability limitation...
This paper presents a novel algorithm for determining the 3D location of a Mobile Tag (MT) using wireless Base Stations (BSs) and Ultra Wide Band (UWB) one-way signaling. The algorithm is designed for low power, rapid deployment applications in which the BSs are independent, wireless UWB transceivers located at known positions and the tags are receive-only or transmit-only UWB mobile units. The algorithm...
Usage of Gigabit-capable passive optical network (GPON) as mobile backhaul is described. Two clock recovery approaches for GPON-based mobile backhaul architecture for 2G / 3G GSM (Global System for Mobile communication) network are described and their performances are compared. Measurement of quality of recovered clock on real GPON is performed and discussed.
This paper investigates various forms of industrial time synchronization and attempts to apply them to Programmable Automation Controllers (PACs) for power system applications. PACs have been used in industry for many control applications, but advancements in synchronization technology has allowed for PACs to be used in high speed control and data acquisition systems. This paper looks at utilizing...
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