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A compact optical-microwave phase detector is proposed and its performance is evaluated by synchronizing an 8-GHz oscillator to a 250-MHz mode-locked laser. The residual out-of-loop phase noise at 1 Hz and 100 kHz offset are −115 dBc/Hz and −146 dBc/Hz respectively. And the RMS timing jitter is 600 as when integrated from 100 kHz to 1 Hz. The proposed phase detector has a compact structure and is...
In the Space domain the High Level Architecture (HLA) is one of the reference standard for Distributed Simulation. However, for the different organization involved in the Space domain (e.g. NASA, ESA, Roscosmos, and JAXA) and their industrial partners, it is difficult to implement HLA simulators (called Federates) able to interact and interoperate in the context of a distributed HLA simulation (called...
In this paper, we propose a new method to compensate Doppler frequency shift for OFDM-based underwater acoustic communication systems. In order to save bandwidth, we do not use additional signal header (preamble) in each OFDM frame as proposed in many conventional approaches. Instead, the central sub-carrier is reserved for pilot transmission. This subcarrier is so-called as the carrier frequency...
In helicopter satellite communications, the periodic blockage of the channel due to the rotor blades degrades the bit error rate (BER) performance. Although time diversity is attractive in order to overcome the periodic blockage, the combining process in the receiver requires the code synchronization. The pre-detection combining is suitable for time diversity because it is superior to the post-detection...
The SATURN Enhanced Data Rate (SEDR) waveform has been introduced by Line Of Sight (LOS) NATO standardization group as the new coalition standard for military airborne Ultra High Frequency (UHF) communications. However, the current design of its physical layer presents several shortcomings since it is a straightforward transposition of SATURN definition to wider channels. Indeed, new generation wide-band...
This paper evaluates the link-level performance of millimeter wave (mmWave) wireless communication system operating on 39.5 GHz frequency band. A frame structure based on the long term evolution (LTE) is proposed, including resource allocation and reference signal pattern. Some key parameters are carefully set to adapt to the mmWave frequency. Simulation results validate that the performance of mmWave...
Some approaches and techniques that allow conducting of complex physiological research using closed-architecture measurement systems of different manufacturers are discussed. The experience in developing a system with flexible configuration and in solving arising problems by virtue of integration of equipment using an external synchronizing device, is described. Parallels are drawn with the modern...
Porting sequential applications to heterogeneous HPC systems requires extensive software and hardware expertise to estimate the potential speedup and to efficiently use the available compute resources in such systems. To streamline this daunting process, researchers have proposed several “black-box” performance prediction approaches that rely on the performance of a training set of parallel applications...
We propose and experimentally demonstrate a downlink 60-GHz millimeter-wave radio-over-fiber fronthaul incorporating coordinated multipoint (CoMP) transmission scheme. CoMP function is implemented in the centralized baseband unit to obtain the transmission diversity. Space-time diversity gain is exploited to improve the data rate of cell-edge users as well as the coverage of 60-GHz small cells. To...
Time-Sensitive Networking (TSN) is becoming more important in automotive and industrial sectors. There is no clear strategy how to use TSN to improve and migrate the established real-time protocols without excluding legacy devices. This paper presents a realistic concept to integrate TSN into automation networks. We choose Sercos as a deterministic Industrial-Ethernet protocol to be extended with...
In converters possessing multiple distributed controllers the synchronization of and the communication between the various controllers are important topics requiring careful consideration. The controllers should be able to transmit data and commands to each other so that different control modes can be selected, reference values updated, parameters shared and so forth. Synchronization is important...
Modern SoCs contain CPU and GPU cores to execute both general purpose and highly-parallel graphics workloads. While the primary use of the GPU is for rendering graphics, the effects of graphics workloads on the overall system have received little attention. The primary reason for this is the lack of efficient tools and simulators for modern graphics applications. In this work, we present GLTraceSim,...
Large scale distributed simulation should be well planned before the execution, since applying unnecessary hardware only wastes our time and money. On the other side, we need enough hardware to achieve an acceptable performance. Thus, it is considerable to estimate the performance of a large scale distributed simulation before the execution. Such an estimation also improves the efficiency of the applied...
Taking advantage of computing capabilities offered by modern parallel and distributed architectures is fundamental to run large-scale simulation models based on the Parallel Discrete Event Simulation (PDES) paradigm. By relying on this computing organization, it is possible to effectively overcome both the power and the memory wall, which are core limiting aspects to deliver high-performance simulations...
To minimize functional morbidity associated with brain surgery, new preventive approaches (also referred to as "prehabilitation") by using motor-imagery-based computer interfaces (MI-BCIs) can be utilized. To achieve successful MI-BCI performance for prehabilitation purposes, the characteristics of an electrocorticographic (ECoG) signal that is associated with overt motor function ("real...
We propose an H∞ design for a fuzzy controller based on a sum of squares (SOS) approach to synchronize a chaotic system. The stability conditions of a chaotic system with external disturbances, which are represented in terms of SOS, are derived to reduce the effects of external disturbances. The disturbance attenuation performance is guaranteed by an H∞ criterion. The proposed conditions for the SOS...
In this paper, we investigate distributed consensus problems for multiple miniature aerial vehicles (MAVs) with nonlinear dynamics and uncertainty. We develop distributed consensus protocol to solve regulation synchronization problem for leaderless MAVs with directed interaction topology. Adaptive control algorithms are used locally for each vehicle to deal with nonlinear dynamics and uncertainty...
Using solely the information retrieved by audio finger-printing techniques, we propose methods to treat a possibly large dataset of user-generated audio content, that (1) enable the grouping of several audio files that contain a common audio excerpt (i.e. are relative to the same event), and (2) give information about how those files are correlated in terms of time and quality inside each event. Furthermore,...
In this paper, an answer to the problem of the synchronization between two non-identical Josephson junctions (NJJ) has been given. The NJJ system includes two junctions, which are modelled by the capacitive and nonlinear resistive components. The junctions have been coupled via a coupling resistance Rcp as a synchronization control parameter to each other and two distinct current sources drive the...
The perfect relationship between deployment costs and systems availability is one of the primary goals of companies that wish to provide some computer environment or service through the Internet. The question that everyone wants to know the answer is: How much may I save and still improve the availability of my system avoiding financial losses with an SLA contract breach? This paper attempts to respond...
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