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In this paper, we propose a complete data-aided (DA) synchronization algorithm for minimum-shift keying (MSK) transmission, which addresses features of the transmit-only Wireless Sensor Network (WSN). To provide reliable packet detection even under a packet overlapping scenario, our frame synchronization metric is based on a pseudo-random (PN) sequence preamble and keeps a constant low false alarm...
Wireless localization systems are of great importance for a variety of modern applications. Recently, cooperation among agents (nodes with unknown positions) becomes attractive in localization networks, especially in the infrastructure-limited scenario. In many cases, synchronization of the agents' clocks to the anchors (nodes with known positions) has to be performed together with the localization...
Gait disorders are a primary consequence of Parkinson's Disease (PD), resulting in loss of patients' independence. Recently, Rhythmical Auditory Stimulation (RAS) gave a preliminary proof to benefit gait quality, but the specific methodology requires a long walkway, preventing the use of a traditional complete gait analysis. In the present work we describe an unobtrusive, wearable setup and the related...
In this paper, we propose a timing synchronization method for orthogonal frequency division multiplexing (OFDM) systems by exploiting the averaged differential correlations of preamble symbol. For the designed simple preamble whose second half-symbol is the complex conjugate of the first one in the time-domain, the proposed timing synchronization method has an impulse-shaped timing metric. Simulation...
Wireless localization systems based on determination of signal runtime (TOA/TDOA) are of great importance for a variety of applications. In many cases, synchronization of the clocks of the agent nodes to those of the network nodes (anchors) has to be performed together with the localization. The current paper investigates the fundamental accuracy limits of such a joint localization/synchronization...
Real-time traffic surveillance is essential in today's intelligent transportation systems. This paper reports on the design of a novel, cost-effective, and intelligent real-time traffic monitoring systems using wireless smart sensor networks. Reliable and computationally efficient algorithms were developed for vehicle counting and speed estimation. The integration of system components and distinctive...
This paper presents the initial implementation of an acoustic synchronization and ranging system to enable the control and cooperation of multiple Unmanned Underwater Vehicles (UUVs). Our solution is based on acoustic clock synchronization and one-way ranging. It requires minimum overhead while providing accurate and quick estimation of the relative distances among underwater nodes. The use of one-way...
In this paper, a timing synchronization technique for orthogonal frequency division multiplexing (OFDM) systems in visible light communications (VLC) environments is presented. The proposed synchronization scheme is based on the timing estimation method by Park et al. [1], but considering a new preamble weighted by Shapiro-Rudin sequences [2]. The performance of the new designed method is evaluated...
Time synchronization is an important factor to take into account when performing collaborative and distributed tasks along a sensor network. Message exchange based time synchronization algorithms ported to underwater acoustic sensor networks, have to deal with high latency communications, besides frame Doppler scaling and frame detection at the receiver side, which are key points for an accurate synchronization...
System-wide monitoring and reliable identification of power quality (PQ) events and their sources is one of the critical requirements of modern grid. Synchronized phasor measurement has helped power engineers and utilities in fast and reliable state estimation and wide area monitoring of power system. This paper proposes a fast and reliable method for estimation of synchronized harmonic phasors. In...
The Second-Order Generalized Integrator (SOGI) was used as a building block for the SOGI-Quadrature-Signal Generator (SOGI-QSG) which has been widely used for grid synchronization, frequency estimation, and harmonic extraction over the past decade. This paper further investigates its integration and differentiation characteristics, with four new integrators and differentiators proposed. Theoretical...
Synchronization is a crucial aspect in grid-tied systems, including single-phase photovoltaic inverters, and it can affect the overall performance of the system. Among prior-art synchronization schemes, the Multi Harmonic Decoupling Cell Phase-Locked Loop (MHDC-PLL) presents a fast response under grid disturbances and high accuracy under harmonic distortions. However, major drawbacks of the MHDC-PLL...
The complex auditory brainstem response to voiced stop consonant-vowel syllables is a newborn biopotential which is going to be a powerful biological marker for diagnosing central auditory processing disorders, and reflects training, learning and aging phenomena in the auditory system; However, this response is deeply buried in the background EEG signals. In other words, signal-to-noise ratio (SNR)...
This paper studies algorithm design and analysis in time synchronization for wireless sensor networks (WSNs) with random bounded communication delays. A least square estimation based time synchronization (LSTS for short) algorithm is proposed. Mathematic modeling of the algorithm is presented. The LSTS algorithm ensures asymptotic convergence of drift estimations and boundedness of global time-synchronization...
The use of video-based eye trackers (VETs) for gaze interaction have allowed people with severe motor disabilities to communicate more effectively. Nonetheless, current low cost VETs present limited accuracy and precision that impose several design constraints for gaze-based computer applications. In this paper we present an extension of the differential lighting (DL) technique for pupil detection...
In this paper, we propose an efficient preamble structure for improving the timing synchronization in Multiple Input Multiple Output (MIMO) Orthogonal Frequency Division Multiplexing (OFDM) systems. The proposed short preamble symbol consists of four equal duration sub symbols, the first and third of which are CAZAC sequences. The second sub symbol is comprised of PN sequences. The fourth sub symbol...
We consider the localization problem using signal-of-opportunities (SOOP) in this paper. We assume beacons and a reference anchor are with known positions and velocities, and all devices have asynchronous local clocks or oscillators. To obtain the range measurements from the received signals, we proposed a bandwidth efficient algorithm which removes the requirement of exchanging raw signals as in...
□ In Agile, getting a work done effectively across a geographically dispersed team has always seen many challenges. □ Challenges such as regular follow ups, dependencies resolution and making sure that the work done is synchronized for a final goal pose a bigger threat for a dispersed team. □ Geographically dispersed team have different time zones. We need to coordinate with the team in their time...
This paper proposes a novel phase-locked loop (PLL) for grid synchronization based on the moving average filter (MAF) and the weighted least squares estimation (WLSE) scheme, namely WLSE-PLL. The MAF can eliminate all the odd-order harmonics and the fundamental negative-sequence component. The WLSE is employed to estimate the fundamental positive-sequence component (FPS). Combining the zero crossing...
We present a digital baseband ASIC for 60 GHz single-carrier (SC) transmission that is optimized for communication scenarios in which most of the energy is concentrated in the first few channel taps. Such scenarios occur for example in office environments with strong reflections. Our circuit targets close-to-optimum maximum-likelihood performance under such conditions. To this end, we show for the...
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