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2020

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Articles 331 - 360 of 1941

Full-Text Articles in Operations Research, Systems Engineering and Industrial Engineering

Study Of Cognitive Model For Survivable System Based On High-Order Multi-Type Π Calculus, Guosheng Zhao, Zhang Nan, Wang Jian Aug 2020

Study Of Cognitive Model For Survivable System Based On High-Order Multi-Type Π Calculus, Guosheng Zhao, Zhang Nan, Wang Jian

Journal of System Simulation

Abstract: A cognitive model for survivable system with a multilayer cognitive ability was proposed, and based on high-order multi-type π calculus, combining formal modeling of cognitive model with quantitative analysis of cognitive performance, thus can obtain the quantitative evaluation of system cognitive performance after formal modeling of system operation state, system service and internal structure. A cognitive model for survivable system with a multilayer cognitive ability was proposed. Based on high-order multi-type π calculus, formal modeling of cognitive model for survivable system in two aspects was taken. By using the tool MWB, the tests were achieved about system availability, instantaneous …

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Signaling Game Analysis And Simulation On Network Decoy Defense Strategies, Leyi Shi, Junnan Zhao, Li Qin, Wen Xiao, Liu Xin Aug 2020

Signaling Game Analysis And Simulation On Network Decoy Defense Strategies, Leyi Shi, Junnan Zhao, Li Qin, Wen Xiao, Liu Xin

Journal of System Simulation

Abstract: The network decoy confrontation is regarded as a kind of observable behavior of a multi-stage signaling game. Four types of gaming models for decoy confrontation process were constructed step by step using signaling game theory, i.e. the normal service, the mixed system of normal service and honeypot, the mixed system with two kinds of signaling, and the mixed system with two kinds of signaling and three actions. In these signaling game models, the server sent a normal signaling or honeypot signaling as the sender, while the attacker chose to access, give up or access in condition as the …

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New Energy-Saving Control Of Induction Motor Considering Core Loss, Bulai Wang, Wei Biao, Zhang Fan, Zhenzhen Huang, Yunfei Zhang Aug 2020

New Energy-Saving Control Of Induction Motor Considering Core Loss, Bulai Wang, Wei Biao, Zhang Fan, Zhenzhen Huang, Yunfei Zhang

Journal of System Simulation

Abstract: In order to further improve the running efficiency of induction motor, a new energy-saving control method was proposed. Considering the influence of varied flux, a control strategy coordinating the optimal flux with the optimal slip angular frequency based on the slip angular frequency control was built. The mathematical model of induction motor considering core loss was established. The expression of the optimal flux and slip angular frequency was obtained according to the Lagrange multiplier method when system was the highest efficiency. By using MATLAB simulation platform, a simulation model of the energy saving control system was built doing a …

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Research On Radar Anti-Jamming Performance Evaluation Index System Based On Rough Set Theory, Zongfeng Qi, Han Shan, Jianxun Li Aug 2020

Research On Radar Anti-Jamming Performance Evaluation Index System Based On Rough Set Theory, Zongfeng Qi, Han Shan, Jianxun Li

Journal of System Simulation

Abstract: The applications of generalized rough set theory were researched for the construction and optimization of radar anti-jamming performance evaluation index system. A mass of real-valued data was converted to some interval-valued data to avoid the difficulty of classification. The H'- information entropy-based information filling technique was employed to solve the problem of missing evaluation data. The E-condition entropy-based heuristic algorithm was applied to make attribute reduction, optimize evaluation index system, and extract final decision rules. The feasibility, validity and practicability of proposed method were testified by a simulation example.

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Facial Vital Sign Based Countermeasure Against 3d Mask Attacks, Xiaojing Gu, Chuanqing Fu, Xingsheng Gu Aug 2020

Facial Vital Sign Based Countermeasure Against 3d Mask Attacks, Xiaojing Gu, Chuanqing Fu, Xingsheng Gu

Journal of System Simulation

Abstract: Vulnerability to spoofing attacks is the main drawback for current face authentication systems. Traditional spoofing attacks include displaying printed photos and replaying recorded videos. With the development of 3D printing technology, the 3D mask spoofing attack has been becoming the new threat. A novel anti-spoofing feature was proposed to 3D mask attacks. A liveness feature from the power spectrum of facial color signal was extracted based on a physiological phenomenon that the color of real human face changed periodically due to the blood circulation. The performance of countermeasure jointly using the liveness feature and facial texture feature was evaluated …

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Modeling And Control Of Shaking Motion Of Aerial Refueling Hose-Drogue, Zhang Jin, Suozhong Yuan, Quanquan Gong Aug 2020

Modeling And Control Of Shaking Motion Of Aerial Refueling Hose-Drogue, Zhang Jin, Suozhong Yuan, Quanquan Gong

Journal of System Simulation

Abstract: Hose-Drogue fly with the tanker in the air can produce shaking motion which increases the difficulty of coupling with a refueling drogue for a receiver plane safely and accurately. A mathematical model of shaking motion of aerial refueling hose drogue under the tanker wake and atmospheric turbulence was proposed by the method of rigid multibody dynamics. Then the balance drag wake of hose-drogue and the atmospheric turbulence on hose-drogue in different flight conditions were analyzed based on this model. To reduce the movement amplitude of the hose-drogue in the air, the controller to the motion of the hose-drogue …

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Cellular Automata Model Of Non-Motor Vehicle Flow Considering Reverse Vehicles, Xianyan Kuang, Weihua Cao, Wu Yun Aug 2020

Cellular Automata Model Of Non-Motor Vehicle Flow Considering Reverse Vehicles, Xianyan Kuang, Weihua Cao, Wu Yun

Journal of System Simulation

Abstract: The phenomenon of non-motor vehicle reverse driving in one-way non-motor vehicle road occurs in most China's cities. A cellular automata model of non-motor vehicle flow mixed with reverse driving vehicles was established, which considered the different lane-changing rules of the reverse and forward vehicle. The results of the computer numerical simulation for the model show that, in low density stage, the ratio of reverse vehicles has little effect on flow and speed, and the capacity and the avenge speed decrease as the ratio of reverse vehicles increases. Lane-changing ratio has a great influence on the mixed non-motor vehicles …

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General Modeling Method Of Aircraft Constant-Altitude Flight, Xiaowen Duan, Xiaoguang Gao, Li Bo Aug 2020

General Modeling Method Of Aircraft Constant-Altitude Flight, Xiaowen Duan, Xiaoguang Gao, Li Bo

Journal of System Simulation

Abstract: An algorithm for the aircraft constant-altitude long-distance flight consider earth curvature studied. The required overload was calculated using the error between the real position and the ideal trajectory for two basic long-distance flight styles, i.e. great circle flight and circular flight, the simulation model of the two basic constant-altitude flight styles was established. On this basis, taking the modeling of constant-altitude box maneuvering and 8-shape constant-altitude flight as an example, the modeling process of constant-altitude combined model was studied. The simulation result shows the constant-altitude flight model can be widely used, easily implemented and easily expanded. Meanwhile, the model …

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Research And Design Of All-Purpose Simulation Platform Of Fault Injection, Wenbin Yao, Zhao Ling, Wang Zhen, Yao Xiang Aug 2020

Research And Design Of All-Purpose Simulation Platform Of Fault Injection, Wenbin Yao, Zhao Ling, Wang Zhen, Yao Xiang

Journal of System Simulation

Abstract: Focusing on the limited injection position and single target system problems existing in the simulation research of fault injection, combined with the NS2 simulation technology and fault injection method, an all-purpose simulation platform of fault injection was proposed. The layered model of the targeted information system was constructed, whose topology information and service performance information was given by the matrix, and improved the generality of the simulation platform of fault injection. Based on the configuration information, the platform constructed the fault library, which brought the cost reduction and reliability promotion of the system faults. The quadruple design of the …

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Software Technology Of Transportation Virtual Simulation Experiment Teaching Center, Shiwei He, Leishan Zhou Aug 2020

Software Technology Of Transportation Virtual Simulation Experiment Teaching Center, Shiwei He, Leishan Zhou

Journal of System Simulation

Abstract: The general architecture and experiments of Transportation National Virtual Simulation Experiment Teaching Center (TNVSETC) were introduced. The features of simulation platforms which include “huge, multi-sources, iomerous” big-data platform, “whole procedure, semi-object, virtual reality” railway planning, design and operation integrated simulation platform, roadway planning, design, control and operations evaluation simulation platform were analyzed. The main modeling techniques and technique characteristics of simulation software including traffic circumstance construction technology, vehicle behavior model, pedestrian behavior model, transporation supplying model and management methods were summarized. The advice on the future development of TNVSETC simulation software was proposed.

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Fusion Comparing Visualization Method For Pesticide Residue Detection Data, Hongqian Chen, Li Hui, Fang Yi, Qixian Liu, Chen Yi Aug 2020

Fusion Comparing Visualization Method For Pesticide Residue Detection Data, Hongqian Chen, Li Hui, Fang Yi, Qixian Liu, Chen Yi

Journal of System Simulation

Abstract: To express efficiently the association and difference among cities, categories and standards in pesticide residue detection data analysis, a fusion visualization method based on data statistic and OpenGL graphics library was proposed. The method can accelerate the dataset comparing and selecting for the expert interaction and data analysis. The method firstly summarizes the detection data in pesticide residue detection database according to its various category and belonging region. All the data are shown in one fusion visualization result. The result can assist expert to compare efficiently and analysis intuitionally the dataset. The data of the selected dataset in …

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Research On Switched Current Mirror Mismatch And Simulation, Jierong Guo, Yigang He, Changqing Liu Aug 2020

Research On Switched Current Mirror Mismatch And Simulation, Jierong Guo, Yigang He, Changqing Liu

Journal of System Simulation

Abstract: Typical sources of switched current mirror mismatch were discussed. The most important three parameter of mismatch: transconductance, threshold voltage and the sub threshold slope were analyzed, due to the switch current circuit adopts the width to length ratio characteristic for calibration design. SPICE model using Hspice platform and 0.18 um BSIM3_V3.1 were proposed for circuit simulation. The simulation and analysis of mismatch were executed based on two kinds of operating rules of weak inversion and strong inversion. The compensation ability for mismatch was provided by floating gate switch current mirror which was also verified by simulation. Analysis and simulation …

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Modeling And Simulation Of Multi-Nozzle Ejector Based On Flowmaster, Lan Jiang, Zhu Lei, Jingquan Zhao Aug 2020

Modeling And Simulation Of Multi-Nozzle Ejector Based On Flowmaster, Lan Jiang, Zhu Lei, Jingquan Zhao

Journal of System Simulation

Abstract: A mathematical model of multi-nozzle ejector was established according to the mass conservation, energy conservation and momentum conservation, and a modification was achieved with the introduction of momentum correction coefficient and discharge coefficient. On this basis, linear coefficients used in the fluid network method were determined, then a system-level simulation model of multi-nozzle ejector was first developed with C# language on the fluid system simulation software of Flowmaster. The simulation and experimental results of the multi-nozzle ejector in an aircraft environmental control system shows that the entrainment ratio decreases with the increasing pressure ratio of primary and secondary flow. …

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Simulation On Aircraft Infrared Exposed Range And Detection Probability, Yunfei Zhang, Mengyue Hu, Dexiong Lai, Gengjun Ma Aug 2020

Simulation On Aircraft Infrared Exposed Range And Detection Probability, Yunfei Zhang, Mengyue Hu, Dexiong Lai, Gengjun Ma

Journal of System Simulation

Abstract: According to the infrared-detector operating range equation, the method used to simulate the infrared detection probability and exposure of an aircraft was established, with the use of atmospheric transmission rate calculation method, the critical radiation strength calculation method and the detection probability calculation method. The physical meaning of the exposed range was analyzed, and an infrared detection simulation system was established. The system could be used to assess the infrared stealth performance of an aircraft, which includes the curve of detection probability and the curve of exposed range, giving the flight route and the infrared radiation intensity distribution of …

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Adaptive Minimum Entropy Blind Equalization Algorithm Based On Quantum Artificial Fish Swarm Optimization, Yecai Guo, Wu Xing, Huang Wei, Wang Hui Aug 2020

Adaptive Minimum Entropy Blind Equalization Algorithm Based On Quantum Artificial Fish Swarm Optimization, Yecai Guo, Wu Xing, Huang Wei, Wang Hui

Journal of System Simulation

Abstract: In order to improve the equalization performance of high order inconstant modulus signals, adaptive minimum entropy super-exponential iteration blind equalization algorithm based on quantum artificial fish swarm optimization was proposed. The proposed algorithm could accelerate convergence rate via super-exponential iteration algorithm and could further decease the mean square error of the super-exponential iteration adaptive minimum entropy blind equalization algorithm via using the global optimization of the quantum artificial fish swarm algorithm designed by Schrodinger equation. The simulation results demonstrate that the proposed algorithm has fast convergence rate and lower mean square error for different higher modulation signals comparison with …

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Short -Term Prediction Of Wind Power Based On Ide-Wnn And Probabilistic Evaluation, Zengliang Liu, Songlin Zhou, Tongxu Zhou Aug 2020

Short -Term Prediction Of Wind Power Based On Ide-Wnn And Probabilistic Evaluation, Zengliang Liu, Songlin Zhou, Tongxu Zhou

Journal of System Simulation

Abstract: Wind power prediction usually concludes determined and uncertainly prediction. The former puts important on prediction accuracy and the later focus on the the risk of prediction results. For increase the prediction accuracy, an improved differential evolution algorithm was applied to widely search the optimal solution of wavelet neural network in different directions. By calculating joint conditional probability of wind power predictions about prediction error and power fluctuation, the risk of prediction results could be more fully assessed. The effectiveness of the proposed method was verified by simulation experiments.

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Analysis And Simulation Of A Class Of Time-Varying Wireless Networked Control Systems, Weihua Deng, Minrui Fei Aug 2020

Analysis And Simulation Of A Class Of Time-Varying Wireless Networked Control Systems, Weihua Deng, Minrui Fei

Journal of System Simulation

Abstract: The problem of stabilization was investigated for a class of discrete time-varying systems over a physical IEEE 802.11b wireless channel. The wireless network-induced delays were characterized by an inverse Gaussian distribution model (IGDM) and the time-varying nature was depicted by uncertain parameter model. The model-based state feedback controller was designed to compensate the influence of delays and time-varying nature. And the stochastic stabilisability of discrete time-varying networked control system was analyzed and the solution of controller was given in the form of linear matrix inequalities (LMIs). The effectiveness of the proposed methods was illustrated by numerical simulation examples.

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Virtual Reality Game For Head Rehabilitation Based On Kinect, Shutao Shen, Gao Fei, Xu Ning Aug 2020

Virtual Reality Game For Head Rehabilitation Based On Kinect, Shutao Shen, Gao Fei, Xu Ning

Journal of System Simulation

Abstract: The application of virtual reality in the rehabilitation has been extensively studied, which helps patients after a stroke independently perform daily living activities, while saving time, money and other costs. This study used Microsoft Kinect virtual reality game to assess the movement of the users. The game required movement outside of the head, torso and arms. In nine games exercise, the average and maximum amount of movement remained unchanged. However, with the increase of exercise, the frequency of head movement increased. The results show that by head movement, video games can be used to balance the posture rehabilitation, …

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Dynamic Arrival Sequencing & Scheduling Based On Branch & Bound Algorithm, Junfeng Zhang, Wang Fei, Tengteng Ge Aug 2020

Dynamic Arrival Sequencing & Scheduling Based On Branch & Bound Algorithm, Junfeng Zhang, Wang Fei, Tengteng Ge

Journal of System Simulation

Abstract: Optimization of arrival sequencing and scheduling is not only the prerequisite for properly allocating and fully utilizing the runway resource, but also the fundamental element for improving terminal operation efficiency. Dynamic arrival sequencing was obtained by time-triggered sliding time window method. On the basis of accurate 4D trajectory prediction, branch and bound algorithm was adopted to generate an optimal sequence, combined with the actual operation constraints. Taking Shanghai Pudong Airport as an example for simulation, the optimization results were compared with the actual landing time and simulation results based on first come first serve strategy. The results indicate that …

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Research And Simulation On Trajectory Control Of Telescopic Boom Aerial Work Platform For Hull Spray Painting, Wang Xin, Lingchong Gao, Zhaoqiu Huang, Yuchen Xiao Aug 2020

Research And Simulation On Trajectory Control Of Telescopic Boom Aerial Work Platform For Hull Spray Painting, Wang Xin, Lingchong Gao, Zhaoqiu Huang, Yuchen Xiao

Journal of System Simulation

Abstract: Telescopic boom aerial work platform, which has been widely applied in ship building field, is taken as research object. An intelligent method of spray painting, continuous spray painting along hull's contour was proposed. Correspondence between position vector of boom's top and drive-space vector was established. A path planning strategy of continuous spray painting was designed, and the variation of driving-space vector was acquired when the path was known. The trajectory control system of intelligent spray painting was modeled in Simulink environment based on the transfer function of electro-hydraulic proportional position control system. The correction link made of …

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Dem Clustering Simplification Algorithm Based On Fractal Dimension, Zhang Fan, Xiaoyang Li, Liu Huan, Hu Wei, Li Wei Aug 2020

Dem Clustering Simplification Algorithm Based On Fractal Dimension, Zhang Fan, Xiaoyang Li, Liu Huan, Hu Wei, Li Wei

Journal of System Simulation

Abstract: Fractal is the essential characteristic of natural scenes. It can describe the irregular extent of surface topography, so it is used for digital terrain generation. As the inverse process of terrain generation, digital terrain simplification usually uses geometric properties such as curvature index as a measure to reduce the grid to improve the efficiency of electromagnetic solver calculations, flood modeling, visual simulation and other issues, while ignoring the fractal nature of the terrain features. Since a traditional simplification algorithm of DEM is difficult to identify the characteristics of complex topography, a new clustering simplification algorithm based on fractal dimension …

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Simulated Training System Of Shipborne Helicopter Deck-Landing Command, Jianguo Wang, Qun E, Xiaogang Xu, Keming Yao, Xinlong Wan Aug 2020

Simulated Training System Of Shipborne Helicopter Deck-Landing Command, Jianguo Wang, Qun E, Xiaogang Xu, Keming Yao, Xinlong Wan

Journal of System Simulation

Abstract: Ship borne helicopter landing on the deck is a complex and dangerous process, and the capability of the deck landing commanders has much influence to the helicopter landing safety. The environment system of ship borne helicopter deck landing was constructed, such as wave simulation, ship rocking simulation and assist deck landing lighting system. The ship borne helicopter landing simulation training system was designed and realized, including command gesture data acquisition, gesture recognition, etc. According to the characteristic of ship borne helicopter landing command, the system applied the gesture capture technology to the landing command training. The application indicates that …

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Characteristics Study Of Internal Gas-Liquid Two Phase Flow Field Of Three Layers Of Air Stirred Tank Reactor, Xiaodong Hu, Dexin Zhang, Jiang Rong, Zenghui Wu, Tian Qiang Aug 2020

Characteristics Study Of Internal Gas-Liquid Two Phase Flow Field Of Three Layers Of Air Stirred Tank Reactor, Xiaodong Hu, Dexin Zhang, Jiang Rong, Zenghui Wu, Tian Qiang

Journal of System Simulation

Abstract: The fluid dynamics and the gas-liquid distribution character in a three-layer stirred tank reactor with 2KSX (four wide blade propeller type stirrer) and PDT (parabolic disc turbine) were analyzed with the MRE (multi-reference frame) method based on Euler-Euler and population balance models. The total and local gas-hold were calculated. The conclusions show that: axial flow was produced by double stir upper KSX with radial flow produced by the third layer of PDT, gas-hold was improved with double-upper-layer stirrers axial driven and the lowest stirrer axial driven, gas-hold increased with the stirred time going on, which would not be extended …

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Novel Modeling Of Memristive Cellular Neural Network And Its Circuit Simulation, Xiaohong Zhang, Linyu Liao, Lianghua Yu Aug 2020

Novel Modeling Of Memristive Cellular Neural Network And Its Circuit Simulation, Xiaohong Zhang, Linyu Liao, Lianghua Yu

Journal of System Simulation

Abstract: The memristor as the fourth fundamental circuit component included along with the resistor, capacitor and inductor could simulate the storage memory function of brain neural network. A traditional three-dimensional CNN was designed, and the output function was implemented with the nonlinear characteristics of a flux-controlled memristor. The conventional electronic devices in Multisim were utilized to simulate flux-controlled memristor which simplified the output function part of the circuits. To compare with the CNN system which has chaotic behaviors, the circuits of novel memristive cellular neural network not only can show a chaos attractors phenomenon, but also the inner magnetic energy …

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Invasive Weed Optimization Algorithm Combined With Chaotic Mutation And Analysis Of Its Property, Huang Xia, Chunming Ye, Cao Lei Aug 2020

Invasive Weed Optimization Algorithm Combined With Chaotic Mutation And Analysis Of Its Property, Huang Xia, Chunming Ye, Cao Lei

Journal of System Simulation

Abstract: Inspired by the reproductive aggressive behavior of weeds in nature, invasive weed optimization algorithm (IWO) was developed as a novel bionic swarm intelligence optimization algorithm. An improved IWO algorithm was proposed on the basis of analyzing bionic principle and limitations of basic IWO, which applied an initialization strategy based on chaotic opposition-based learning, increased the diversity of the population through the mutation operator, and enhanced its ability to jump out of local optimal value by chaotic search around current elites. Simulation results for benchmark functions show that the proposed algorithm has improved optimization property compared with IWO, as an …

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Trusted Modeling And Analysis Of Complex Software Systems Based On Spatial-Temporal Petri Nets, Li Gang, Longmei Han, Yongli Zhu Aug 2020

Trusted Modeling And Analysis Of Complex Software Systems Based On Spatial-Temporal Petri Nets, Li Gang, Longmei Han, Yongli Zhu

Journal of System Simulation

Abstract: Complexity of complex software system is not only due to the coupling correlation software itself, but also the Internet environment has great influence on the complex software system, and it has not existed independently from the external environment. Petri net uses of place and transition meet the modeling of distributed system, support concurrency and asynchronous, but the basic Petri net can't completely describe the characteristic of complex software systems with time constraints. A Petri net modeling method based on spatial and temporal was proposed. From aspects of synergetic and software behavior, constraints on the characteristics of spatial and temporal, …

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Calculation Of Transformer Core Loss Based On Finite Element Coupling Algorithm, Yongqiang Wang, Zhihong Zheng, Baolong Ouyang, Jianfang Li Aug 2020

Calculation Of Transformer Core Loss Based On Finite Element Coupling Algorithm, Yongqiang Wang, Zhihong Zheng, Baolong Ouyang, Jianfang Li

Journal of System Simulation

Abstract: In order to accurately calculate the deducting transformer core loss, on the basis of analysis on traditional finite element method and Steinmetz method, an edge-nodal coupled $E-\psi$ method was proposed to calculate the High Power High Frequency High Voltage transformer core loss. Taking a 20 kHz, 50 kV, 60 kW transformer for example, the 3D model was established to calculate the transformer core loss. By comparing the measured data of transformer core loss with the figures calculated by edge-nodal coupled $E-\psi$ method, NFEM, EFEM and Steinmetz method, the comparison results show that: the edge-nodal coupled $E-\psi$ method has higher …

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Research On Scheduling Problem Of Single-Arm Cluster Tools With Residency Time Constraints, Lu Rui, Linying Li Aug 2020

Research On Scheduling Problem Of Single-Arm Cluster Tools With Residency Time Constraints, Lu Rui, Linying Li

Journal of System Simulation

Abstract: Considering the scheduling model and schedulibility for single-arm cluster tools with wafer residency time constraints, a mixed- integer linear programming model with both single-arm and temporal constraints for processing module was constructed. The rationality of equivalent processing time for concurrency module was theoretically proved. Based on this, the periodic wafer processing and transportation procedure for both single-arm and processing module was analyzed. Meanwhile, the schedulibility conditions for cluster tools were proved. The simulation experiments were carried out to test the model and schedulable conditions, and the results reveal the validity and feasibility of the presented model.

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Cooperative Controller Design For Redundant Dual Arm Robot, Meiling Wang, Minzhou Luo Aug 2020

Cooperative Controller Design For Redundant Dual Arm Robot, Meiling Wang, Minzhou Luo

Journal of System Simulation

Abstract: Cooperative operation for a redundant dual arm robot can be divided into three modes, namely, independent mode, full constrained cooperative working mode and partly constrained cooperative working mode. The dynamic equations of both dual arms and the interactions between dual arms and the operating objects were established and derived based on the three modes, and a unified formulation was obtained. With focus on motion and force of the desired task being operated, a unified controller was designed which could be carried out based on two dynamic model based controllers, namely feedforward controller and computer torque controller. Simulations of dual …

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Low-Complexity Soft-Decision Decoding Algorithm For Bch Code In Beidou System, Guowei Qu, Songfeng Deng Aug 2020

Low-Complexity Soft-Decision Decoding Algorithm For Bch Code In Beidou System, Guowei Qu, Songfeng Deng

Journal of System Simulation

Abstract: A low-complexity soft-decision decoding algorithm based on the re-encoding technique was proposed for the BCH(15,11) code in BeiDou satellite navigation system. Several candidate information sequences were constructed by the soft-decision vector and then re-encoded in the algorithm if the error in the hard-decision result was detected. The correlation between each codeword and the soft-decision vector was calculated, and the codeword with the maximum correlation value was selected as decoding output. Simulation results show that the presented algorithm outperforms traditional hard-decision decoding at the expense of moderate complexity increase. Moreover, the storage of error-correction ROM signal is avoided. …

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