Minimization of Network Induced Jitter Impact on FPGA-Based Control Systems for Power Electronics through Forward Error Correction

In modular distributed architectures, the adoption of a communication method that is at the same time robust and has a low and predictable latency is of utmost importance in order to support the required system dynamics. The aim of this paper is to evaluate the consequences of the random jitter on machine drives distributed control, caused by the messages’ re-transmission in case of an error in the received data. To achieve this goal, two different Forward Error Correction (FEC) techniques are introduced in the chosen protocol, so that the recipient of the message can correct random errors without the need of any additional round trip delays needed to request and obtain a re-transmission. Experimentally validated simulations are used to evaluate the impact of random network derived jitter on a real world closed loop control system for distributed power electronic converters.

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The impact of open-loop vehicle stability on closed-loop control system performance: an analysis of four AUV concepts

OCEANS 92 Proceedings@m_Mastering the Oceans Through Technology ◽

10.1109/oceans.1992.607637 ◽

2005 ◽

Author(s):

D.E. Humphreys ◽

K.W. Watkinson

Keyword(s):

Control System ◽

System Performance ◽

Closed Loop ◽

Open Loop ◽

Vehicle Stability ◽

Closed Loop Control ◽

Loop Control ◽

Closed Loop Control System ◽

Loop Control System ◽

The Impact

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Use of a Heating System to Control the Probiotic Beverage Production in Batch Bioreactor

Applied Sciences ◽

10.3390/app11010084 ◽

2020 ◽

Vol 11 (1) ◽

pp. 84

Author(s):

Jožef Ritonja ◽

Andreja Goršek ◽

Darja Pečar

Keyword(s):

Control System ◽

Fermentation Process ◽

Closed Loop ◽

Closed Loop Control ◽

Loop Control ◽

Batch Bioreactor ◽

Closed Loop Control System ◽

Loop Control System ◽

The Impact

Fermentation is a crucial bioengineering process, existentially important for modern society. The most commonly used production unit for this process is the batch bioreactor. Its main advantage is unsophisticated construction, which unfortunately results in its incapability of controlling the transient state of the fermentation process. Control of the fermentation can significantly improve the quality of the product and the economy of the process; therefore, it is useful for bioreactors to be equipped with a control system. Based on the experimental results, we used an optimization method to identify a mathematical model that describes the impact of the bioreactor’s temperature on the fermentation’s transient process. The obtained model was applied for the design and synthesis of the closed-loop control system. Simulations and experiments confirmed the effectiveness of the proposed control system. In this way, we can ensure the consistent quality of the produced probiotic product, increase the amount of the product, and shorten the fermentation time. The original results display the feasibility of the closed-loop control of the batch bioreactor’s fermentation process by changing the temperature. So far, the process has been carried without a closed-loop control system. The problem is current and has not yet been solved sufficiently. There are many attempts published; one of the last shows the possibility of controlling the fermentation process by changing the oxygen supply, which is more complex and expensive for realization than the solution from our study.

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A Method to Supervise the Effect on Railway Radio Transmission of Pulsed Disturbances Based on Joint Statistical Characteristics

Applied Sciences ◽

10.3390/app10144814 ◽

2020 ◽

Vol 10 (14) ◽

pp. 4814

Author(s):

Xin Geng ◽

Yinghong Wen ◽

Jinbao Zhang ◽

Dan Zhang

Keyword(s):

Error Correction ◽

Electromagnetic Interference ◽

High Speed ◽

Forward Error Correction ◽

Statistical Characteristics ◽

Error Performance ◽

High Speed Railway ◽

Essential Information ◽

Forward Error ◽

The Impact

Radiocommunication systems between train and trackside (RSTT) carry essential information for train operations between on-board radio equipment and the related radio infrastructure located along the trackside, such as the train control, voice dispatching, command, operational information as well as the monitoring data. In a high-speed railway environment, the electromagnetic interference (EMI) has been a major threat to RSTT, and may result in critical security issues for railway transportation and even passengers. Given the complex scenario of the high-speed railway, it is significant to monitor the impact of disturbances in order to guarantee the quality of RSTT. On one hand, RSTT operate in a complex electromagnetic environment where transient disturbances coexist with permanent ones, and they both vary dramatically while the train is running. On the other hand, various radiocommunication technologies have been used for railway applications, featuring forward error-correction codes to resist EMI. Therefore, this paper puts forward a novel approach to evaluate the impact on radio transmission based on the joint statistical characteristics of time-varying EMI. This approach applies a dynamic effective signal-to-interference-plus-noise ratio mapping model to establish the relation between the block error performance of on-board radio and the joint statistical characteristics of disturbances with a mutual information-based metric. Simulations on radio transmission using Turbo coding and low-density-parity-check coding under various interferences indicate that this approach is effective to evaluate the degradation of transmission signal with forward error-correction coding due to EMI with different characteristics.

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Area and Energy Efficient QCA Based Compact Serial Concatenated Convolutional Code Encoder

Journal of Physics Conference Series ◽

10.1088/1742-6596/2161/1/012025 ◽

2022 ◽

Vol 2161 (1) ◽

pp. 012025

Author(s):

B.S. Premananda ◽

T.N. Dhanush ◽

Vaishnavi S. Parashar

Keyword(s):

Energy Dissipation ◽

Error Correction ◽

Forward Error Correction ◽

Convolutional Code ◽

Internal Clock ◽

Random Errors ◽

Clock Generation ◽

Convolutional Coding ◽

External Clock ◽

Forward Error

Abstract Quantum-dot Cellular Automata (QCA) is a transistor-less technology known for its low power consumption and higher clock rate. Serial Concatenated Convolutional Coding (SCCC) encoder is a class of forward error correction. This paper picturizes the implementation of the outer encoder as a (7, 4, 1) Bose Chaudhary Hocquenghem encoder that serves the purpose of burst error correction, a pseudo-random inter-leaver used for permuting of systematic code words and finally the inner encoder which is used for the correction of random errors in QCA. Two different architectures of the SCCC encoder have been proposed and discussed in this study. In the proposed two architectures, the first based on external clock signals whereas the second based on internal clock generation. The sub-blocks outer encoder, pseudo-random inter-leaver and inner encoder of the SCCC encoder are optimized, implemented and simulated using QCADesigner and then integrated to design a compact SCCC encoder. The energy dissipation is computed using QCADesigner-E. The proposed SCCC encoder reduced the total area by 46% and energy dissipation by 50% when compared to the reference SCCC encoder. The proposed encoders are more efficient in terms of cell count, energy dissipation and area occupancy respectively.

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