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Modeling and simulation has received significant attention over the years for its ability to understand and transform real world systems. With the increasing of complexity and scale of the simulated systems, more computational power is required. Parallel discrete event simulation(PDES) is an important technology to integrate parallel computing into modeling and simulation. Time synchronization algorithm...
Synchronization algorithms are mandatory for simulating local computation models of distributed algorithms. Therefore, correctness of these algorithms becomes crucial, because it gives confidence that local computations are simulated as designed and do not behave harmfully. However, these algorithms are considered to be very complex to prove since they are integrating both distributed and probabilistic...
This paper presents the study and simulation of synchronization algorithm for a three phase grid connected photovoltaic (PV) system. The synchronization algorithm employs synchronous reference frame based phase locked loop with a positive sequence detection. As compared to other methods, this algorithm provides a higher degree of immunity and insensitivity to noise and harmonic distortions. The maximum...
The dual-mode photovoltaic inverter is capable of operating either in grid-connected mode or island mode, acting as a current source for the ac grid in the former and a voltage source for the load in the latter. Transitioning from one mode to the next is non-trivial and can cause large deviations in voltage, current, and frequency because a mismatch in frequency, phase, and amplitude between the inverter...
We present a design scheme for the synchronization of linear heterogeneous SISO systems by static feedback controllers. Extending some recent results, a distributed method is provided for synchronizing non-identical agents by a simple synchronization controller for homogeneous agents. In [4], it was shown that for a special condition heterogeneous agents can be synchronized by static controllers....
Clustering is one of the important streams in data mining which is useful for discovering groups and identifying interesting distributions in the underlying data. For efficient clustering process in high dimensional datasets, synchronization algorithm is proposed. It can perform clustering by using the mathematical model called kuramato model. This model is widely used for the synchronization of oscillators...
A simple, low cost and robust OFDM-PON symbol synchronization technology is proposed and experimentally demonstrated. The main idea of this algorithm is to make use of the periodicity of the OFDM symbol to achieve symbol and frame synchronization at the receiver. This technology is applicable for the OFDM-PON system as some simple subtraction is required but without any multiplication. Using the proposed...
In this paper, we gave a brief discussion of the expanded time and frequency OFDM (ETF-OFDM) system and its traditional synchronization method (the Schmidl's method). And then we present a rapid frame and symbol synchronization algorithm in this system for just detecting one training symbol instead of two training symbols in Schmidl's method. The algorithm has low calculation complexity and outperforms...
For the high accuracy synchronization requirement of IEC61850 based digital substation, to apply a combination of time synchronization scheme to Substation Automation System (SAS), PTP(pricision time synchronization protocol) is adopted between bay level and process level equipment, the paper presents a method of combination of adjusted frequency and adjusted phase to achieve precision synchronization...
This paper proposes a practical synchronization algorithm for Transmit-Reference UWB receiver which uses sliding window and supports flexible sampling rates. Additionally, a Simulink model and implementation of synchronization algorithm in receiver by hardware description language (HDL) is also developed using model-based design. Finally, we assess impact of signal-noise-rate (SNR), number of bits...
OFDM (Orthogonal Frequency Division Multiplexing) has been applied in Vehicular Ad Hoc Networks (VANET) due to its ability to counteract the frequency-selective fading and its high spectral efficiency. For instance, OFDM-based IEEE802.11 802.11p has been standardized for VANET. In OFDM-based VANET, synchronization of the carrier frequency at the receiver must be performed accurately to avoid performance...
In this paper to improve the capacity and coverage of the channel in WCDMA with OFDM, a concatenation of Wideband Code Division Multiple access (WCDMA) and Orthogonal Frequency Division Multiple Access (OFDM) is used as spreading code. Synchronization error which degrades the OFDM system performance is reduced by implementing Synchronization Algorithm which is used to estimate the offset and by using...
Recently, the requirements for the five sense media representation are arising rapidly. Until now, most people mainly used the method SMSD on one device, but we need more than one device to play multiple A/V and multiple sensory effects for effective five sense media representation. Therefore, multiple A/V device synchronization and multiple sensory effect device synchronization are very important...
We study a new synchronization algorithm based on low-density parity check codes. The algorithm was developed for scenarios with redundant information in 2010, [1]. We describe a revised version of the algorithm and, for the first time, we discuss the fundamentals about the coding and decoding theory. The results of this analysis define the scope and restrictions of the algorithm. We show that the...
A receiver structure based on a joint LDPC decoding and synchronization algorithm and realized on an FPGA platform is introduced. The realization system achieves the BER of 1e-5 at the channel SNR of -4.6 dB with moderate hardware complexity, and the performance degradation is less than 1.3 dB from the ideal situation. So it is suitable for deep space communications and other wireless communications.
Time synchronization is critical in distributed network system. A variety of network protocols, middleware and business applications rely on proper time synchronization across the computational infrastructure and depend on the clock accuracy. The “Network Time Protocol” (NTP) is the current widely accepted standard for synchronizing clocks over the Internet. In order to reduce access frequency to...
A frame-level synchronization (FLS) algorithm for the UWB differential transmitted-reference (DTR) receiver is designed and analyzed in this paper. In DTR systems, the detector computes the decision statistic by correlating pulses from adjacent frames and summing the contributions from the entire frame of a symbol. Symbol-level synchronization is not enough for data modulation single the position...
Base on energy-efficient filed data transmission system and 8b10b modulation code, this paper discusses a hard correlation frame sync algorithm. This algorithm can get the performance similar to maximum likelihood algorithm, and has advantages in energy, complexity and realization with programmable logic. Finally, the algorithm is realized by Very high speed Hardware Description Language (VHDL) in...
Cooperative spectrum sensing scheme for Digital Multimedia Broadcasting-Terrestrial (DMB-T) system in China is investigated in this paper. There are three frame header modes defined in DMB-T Standard. For frame header mode 2, the only PN sequence is utilized to perform waveform-based spectrum sensing, and an improved synchronization algorithm is proposed. For frame header mode 1 and 3, extended pseudonoise...
A digital PWM voltage mode controller integrated circuit (IC) for high-frequency dc-dc switching converters achieving virtually minimum possible, i.e. optimum, output voltage deviation to load transients is introduced. The IC is implemented with simple hardware, requiring small silicon area, and can operate as a single-phase or a two-phase controller. To minimize the area and eliminate known mode...
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