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The Trustful Space-Time Protocol (TSTP) allows for time synchronization to be performed upon receiving any message from another node in a sensor network, removing the need for explicit synchronization messages. Previous work has shown that TSTP performs well under controlled experimental environments. In this work, we analyze how the quality of synchronization in TSTP is affected when nodes are communicating...
Electrical energy generation is evolving from centralized towards distributed energy resources (DER) like wind and solar power plants. In such power systems, new challenges arise for the design of voltage source converter (VSC) control strategies. In the last few years synchronverters have gained interest from the research community due to their capability of emulating synchronous machines (SMs) and...
Upset hardened dual-interlocked cell (DICE) [1] has found an important place in circuits for space applications due to its ability to mitigate single event upsets (SEUs). In this paper, we show that DICE latch/flip-flop exhibits better immunity to metastability compared to D flip-flop, and can be used as data synchronizer. Metastablity constant (τ), whose inverse captures the ability of the latch...
The clock synchronization technologies applied to controlling layer and primary equipment like intelligent switchgear of processing layer in intelligent substation are analyzed in this paper. IEEE1588 message timing mode, which can be accurate to nanosecond, is used as the mode of substation system, in order to fulfill the real-time and accuracy requirements of intelligent switchgears and remote control...
Future tactical communications involves high data rate best effort traffic working alongside real-time traffic for time-critical applications with hard deadlines. Unavailable bandwidth and/or untimely responses may lead to undesired or even catastrophic outcomes. Ethernet-based communication systems are one of the major tactical network standards due to the higher bandwidth, better utilization, and...
Industrial applications demand for ease of deployment, reliability and low-power in wireless networks, leading to standards like IEEE802.15.4, which include time synchronized channel hopping mechanisms. Yet, scheduling of transmissions on timeslots and channels falls outside the scope of current standards. Given the application requirements above, distributed (rather than centralized) scheduling has...
Hybrid Broadcast Broadband TV (HbbTV) is an industry standard for hybrid multimedia devices that are able to combine broadcast and IPTV delivery. This paper deals with companion screen devices, companion screen applications and communication of those applications with HbbTV terminal and its applications. Companion screen devices offer additional content to user and for pleasant experience communication...
Advanced Driver Assistance System is a growing trend in automotive industry that integrates multiple discreet components to create system level solution. A typical ADAS system in an automobile has single or multiple radar chips to transmit and receive electromagnetic waves and a microcontroller to process received data that is used for assisting driver in decision making. Radar chip and microcontroller...
The latest extended-coverage (EC-GSM-IoT) and high-throughput (EGPRS2A) enhancements make GSM competitive to LTE-based cIoT standards such as NB-IoT with the advantage of global coverage today. This work introduces the first fully-integrated RF-SoC supporting the complete GSM standard family ranging from EC-GSM-IoT through EGPRS2A. The RF-SoC achieves −121.7 dBm receiver sensitivity and peak data...
Synchronization has become a main concern in communication and control systems during the last years. Although there are several standard mechanisms to accomplish timing requirements, development and improvement of high synchronization technologies is required to obtain better performance and quality of service. In this context, the enhanced version of IEEE 1588v2 synchronization protocol, known as...
Distributed cyber-physical systems cover a wide range of applications such as automotive, avionic or industrial automation. These applications require a global notion of time to fullfill their timing requirements. Multi-processor system on chips (MPSOCs) are an attractive implementation option since they offer several benefits such as parallelism and power efficiency. However, MPSOCs have a Globally...
High quality of the provided communication services can be reached by package networks by the organization of network synchronization of the time scales (TS). The report summarizes the experience of comparing the TS of the leading watches of the corporate telecommunication network with the state time scale - UTC (SU). The methods of realization of checking of a time scale and methods of distribution...
Variety of systems were developed based on the Internet of Things (IoT) concept including autonomous systems, which operate without human intervention. Development of such systems requires not only data from devices, but also interaction between these devices. It is necessary that one IoT-system could control other devices behavior. There are several problems related to that task including problem...
Multiplexers (MUXes) are ubiquitous in digital circuits. A MUX processes inputs a, b and a select bit s to output a if s = 0 and b otherwise. Hence, in the case of a = b, the output must be a, regardless of s. Unfortunately, common MUX implementations violate that specification if s is degraded. We propose efficient transistor-level implementations of Metastability-Containing Multiplexers (CMUXes)...
In this research, we attempt to develop for artistic music loop performance on a de facto standard digital DJ system with TouchOSC. Through the analysis on the functions and UI of de facto DJ software and controllers, the 4 shortage of functions for artistic music loop performance were found. Therefore, we built the remote controller system by TouchOSC. It enables to control the complicated music...
Packet collision and packet delay are considered to be critical for safety applications in vehicular networks. This paper designs a new analytical model to evaluate the performance of channel switching for IEEE 802.11p/WAVE in vehicular networks. Under this model, it explicitly expresses the WAVE channel switching, and constructs contention window size and number of vehicles as packet collision probability...
The use of beamforming techniques at the ground station is known to be effective in obtaining coverage extension or SNR gain for communication with unmanned aerial vehicles (UAVs). When a UAV moves, periodic beam tracking is necessary to maintain beam gain. To track beams for multiple UAVs, the ground station needs to receive different preambles from multiple UAVs. In this paper, a Hadamard sequence...
This paper considers basic methods for high-precision synchronization of spatially-distributed reference oscillators of non-request measuring stations for GLONASS without their delivery to the location of frequency and time reference. New solutions for tropospheric and ionospheric error estimation and reduction during synchronization are provided.
With the introduction of DVB-T2 in Germany and other European countries as new standard for Digital Video Broadcasting the underlying passive radar signal processing has also to be adapted, because the currently used predecessor, DVB-T, is not compatible to DVB-T2 on the physical layer. DVB-T2 has been improved in order to achieve a higher data rate and to allow more flexibility for different use...
This paper proposes an event detection module for distributed denial of service (DDoS) attacks on Internet of Things (IoT). Different from existing detection modules using knowledge-based filtering, the proposed module focuses on the system behavior under DDoS attacks and detects it utilizing information obtained from NTP used in synchronization service. We conducted demonstration experiments with...
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