Digital Signal Processing

1405 Submissions

[42] viXra:1405.0162 [pdf] submitted on 2014-05-08 00:25:17

New Compacton-Like and Solitary Patterns-Like Solutions to the L-DBM Equation

Authors: Weimin Zhang
Comments: 5 Pages.

Using a new transformation, the compacton-like and solitary patterns-like solutions of the L-DBM equation are obtained
Category: Digital Signal Processing

[41] viXra:1405.0102 [pdf] submitted on 2014-05-07 03:57:19

Direct Voltage Control in Distribution System using CMLI Based STATCOM

Authors: Jagdish Kumar
Comments: 10 Pages.

This article presents a technique using system identification for the determination of transfer functions of a CMLI Static Synchronous Compensator used in power systems for the design of parameters of controllers in order to minimize voltage fluctuations and capacitor voltage balancing. The transfer functions obtained using system identification technique have been used for the determination of controllers’ parameters for load bus voltage and capacitor charge balancing using Ziegler-Nichols technique. Digital simulation on an 11-level CMLI based Static Synchronous Compensator is carried out using MATLAB/SIMULINK for different load combinations using PI controllers’ parameters as obtained corresponding to identified model. It is found that simulation results obtained using identified model give good performances.
Category: Digital Signal Processing

[40] viXra:1405.0098 [pdf] submitted on 2014-05-07 04:05:13

Language Detection for Classification and Content-Based Web Pages Filtering

Authors: Saman Bashbaghi, Abdol Hamid Pilevar
Comments: 11 Pages.

According to Daily increase of the documents on the internet, automatic language detection is getting more important. In this paper we used language detection system to classify and filtering of the immoral web pages, based on their contents. This system could detect 10 most used languages in the immoral web pages, including FARSI language. As a technique we introduce a new combined method which consists of three parts; URL Processor, page encoding processor, and text processor. In order to generate proper results this system has a voter which combines the results of these three parts. We used the immoral web pages and labeled web pages as an input data set in order to make a linguistic model for each language and system evaluation. Our experiments show 95% success in accuracy of outcome results.
Category: Digital Signal Processing

[39] viXra:1405.0097 [pdf] submitted on 2014-05-07 04:07:19

Application of Air - Cooled Chiller for Comfort and Energy Saving

Authors: Yung-Chung Chang, Chiun-Ren Su, Jyun-Ting Lu, Ching-Liang Chen, Ching-Wei Chen, Cheng-Wen Lee, Jin-Kuei Lee
Comments: 13 Pages.

In this study, a frequency converter was used to carry out variable frequency control to the compressor with constant frequency of a small 3RT central air-conditioning air-cooled chiller, but the indoor blower and cooled water pump were still kept by constant frequency operation. It is to explore the energy-saving effect of chiller compressor and the cooling fan after being carried out the variable frequency control, on the premise of PMV, the index of thermal comfort, set to 0.5. The experimental results indicated that under constant frequency operation, the average power consumption of compressor was 2.62kW and the average power consumption of cooling fan is 0.33kW; under variable frequency operation, the average power consumption of compressor is 2.38kW and the average power consumption of cooling fan was 0.29kW. After variable frequency control, the compressor could save 9% power consumption, and the cooling fan could save about 14% power consumption, with remarkable energy-saving results.
Category: Digital Signal Processing

[38] viXra:1405.0095 [pdf] submitted on 2014-05-07 04:31:46

Energy Saving Analysis of Variable Primary Flow System with Screw Chiller

Authors: Yung-Chung Chang, Pin-Cheng Chieng, Jyun-Ting Lu, Tien-Shun Chan, Ching-Liang Chen, Cheng-Wen Lee
Comments: 18 Pages.

This paper focuses on energy-saving operation and use of the variable primary flow (VPF) of a central air-conditioning system chiller, by means of regression analysis to determine the relationship equation of chiller power consumption and cooled water flow rate, cooled water supply temperature, cooling water return temperature, and partial load, and the relationship equation of the cooled water pump power consumption and the cooled water flow rate. Take the relationship equations as basis to identify the power consumption change curve of loads in different flow rates, and calculate the most energy-saving cooled water flow rate of the chiller and the cooled water pump in various loads.
Category: Digital Signal Processing

[37] viXra:1405.0094 [pdf] submitted on 2014-05-07 04:53:30

Study on Applying Differential Pressure in Determining the Flow Rate of Air Conditioning and Heating System

Authors: Yung-Chung Chang, Chung-Liang Chen, Jyun-Ting Lu, Cheng-Wen Lee, Ching-Wei Chen, Jin-Kwei Lee
Comments: 24 Pages.

The main purpose of this study is to apply regression analysis to build the relationship between flow rate and differential pressure by modeling through experimental data, and specifically use such relationship in interpreting the flow rate of air conditioning water system, in order to establish a lower-cost alternative flow rate interpretation of which the information obtained is more conveniently. For the experimental way, we installed pressure transmitters and paddle wheel flow meters in the condenser side of the chiller, air-handling unit and in the inlet and outlet ends of pump of a small air-conditioning system respectively, and then recorded the values of such device as the pump, the air-handling unit and the condenser under different use conditions as a single pump operation, multi-pumps operation in parallel, and multi-pump operation in variable frequency, to carry out the modeling of relationship between differential pressure and flow rate by actual operation data, and analyze the results. From the experimental results, the modeling equations obtained by the air-handling unit and condenser ends are applicable to a single pump operation, multi-pump operation in parallel and multi-pump operation in variable frequency. The differential pressure obtained to interpret flow rate has a high accuracy and the error value is less than 2%. According to the study results of this experiment, the convenience of flow rate interpretation can be significantly enhanced to facilitate the formulation of air-conditioning energy-saving strategy.
Category: Digital Signal Processing

[36] viXra:1405.0092 [pdf] submitted on 2014-05-07 04:55:29

Effect of Voltage Unbalance on Adjustable Speed Drives and its Mitigation Using Supercapacitor

Authors: S.S.Deswal, Ratna Dahiya, D. K. Jain
Comments: 19 Pages.

During the voltage unbalance, the resulting adverse effects on equipments such as induction motors and power electronic converters and drives on ASDs have been described. It has been observed that during unsymmetrical fault, the input rectifier slips into the single phase operation and draw heavy currents which may actuate the overload protection and trip the ASDs. The application of supercapacitors bank with boost converter to inject energy at DC-Link under voltage unbalance condition has been incorporated. The supercapacitor provides ride-through and reduces the current overshooting by injecting energy at DC-Link. Based on the designed topology, simulation model in MATLAB 7.5 (Sim Power Block set) has been developed for voltage unbalance conditions with supercapacitor as an energy storage device. The designed control technique is modeled, simulated and successfully implemented in the laboratory. The extensive simulation results supported by experimental results were provided to validate the proposed system
Category: Digital Signal Processing

[35] viXra:1405.0091 [pdf] submitted on 2014-05-07 04:56:33

Affect Analysis in Persian Text Documents

Authors: Shokoofe Dashtbani, Abdol Hamid Pilevar
Comments: 7 Pages.

in this article we review a new approach to analysis the Persian texts. This paper is studied the emotional analysis in Persian texts. Methods and features proposed in this article are compared with English methods. Recently, analysis of texts in other languages has been studied particularly in English language and many methods are presented for the rapid analysis of English texts. The method used in this paper is similar to methods used in the English language. This analysis is done by making emotional categories. The method based on emotional categorization of the semantic similarities. For building the emotional categories in Persian, we used semantic similarity and this method has been successful to emotional analyze of the Persian texts about 80 percent of the cases.
Category: Digital Signal Processing

[34] viXra:1405.0090 [pdf] submitted on 2014-05-07 04:57:34

Design and Development of Circular Microstrip Antenna for Multiband Operations

Authors: Boya Satyanarayana, S. N. Mulgi, P. V. Hunagund
Comments: 10 Pages.

This paper presents design and development of circular microstrip antenna for multiband operation using low cost substrate material realized from conventional circular microstrip antenna. The proposed antenna is a novel geometry consisting crossed slot equal arm length with truncated edges of a circular patch. The antenna uses the feed line same as that of the conventional circular microstrip antenna. The antenna operates in the frequency range of 2.03 to 9.56 GHz and gives a virtual size reduction of 31% with broadside radiation characteristics at each operating band. The experimental and simulated results are in good agreement with each other. This antenna may find applications in WLAN, WiMax and other wireless communication applications.
Category: Digital Signal Processing

[33] viXra:1405.0089 [pdf] submitted on 2014-05-07 04:58:36

Improved Optical Packet Switching Using Space Switch Arrays

Authors: Disha Khanna, Anuradha Kuckian, Ipsita Mishra, Lochan Jolly
Comments: 12 Pages.

Simulations of a 4 x 4 optical packet space switch array based on optically amplified suppressed interference switches (OASIS) were carried out. The OptSim simulator was used to model the structure, to assess the behavior and performance of this switch array. Parameters such as Q factor and bit error rate (BER), jitter were calculated. Implications of cascadability of this switch array are investigated which improves the quality and capacity of the existing networks. Transparent space switch array is an enabling technology for implementing OPS.[1] .Switch configuration for both 10Gbps and 40Gbps systems has been proposed.
Category: Digital Signal Processing

[32] viXra:1405.0088 [pdf] submitted on 2014-05-07 04:59:45

The Necessity for Considering Distribution Systems in Voltage Stability Studies

Authors: Farid Karbalaei, Ataollah Abedinzadeh, Mehran Kavyani
Comments: 11 Pages.

As stated in literature, when a load is of the constant power type, the voltage stability limit point coincides with the point of maximum power transfer. But when a part of load is voltage dependent, such as polynomial load, the voltage stability limit extends beyond the maximum power point. It means that parts of the lower portion of the bus PV curve are stable. This paper shows that because of the distance between the distribution transformers equipped with LTC mechanisms and the transmission buses, the voltage instability occurs before reaching the maximum power transfer point at the transmission buses. In this condition, the voltage collapse point can't be determined using an aggregate load model seen from a transmission bus, and a detailed model of distribution system is needed.
Category: Digital Signal Processing

[31] viXra:1405.0087 [pdf] submitted on 2014-05-07 05:00:48

DSP Based Real Time Implementation of ac-DC-ac Converter Using SPWM Technique

Authors: Umashankar S, Mandar Bhalekar, Surabhi Chandra, Vijayakumar D, Kothari D P
Comments: 18 Pages.

In most of the drives applications, variable speed concept is achieved by using a back-to-back two level frequency converters. Firstly the open loop system model of ac-dc-ac converter is designed, simulated and realized in SIMULINK. TMS 320F28335 is used for pulse generation by SPWM technique. The problem of controlling the induction motors driven through ac-dc-ac converters is considered. The control objective is restricted to forcing the motor speed to track reference signal and is done with D-Q voltage control technique. The simulation is carried out in MATLAB/SIMULINK and results of both simulation and actual model are compared.
Category: Digital Signal Processing

[30] viXra:1405.0086 [pdf] submitted on 2014-05-07 05:01:32

Behavior Model of Noise Phase in a Phase Locked Loop Employing Sigma Delta Modulator

Authors: Tayebeh Ghanavati Nejad, Ebrahim Farshidi
Comments: 12 Pages.

This paper proposes two techniques for fractional-N synthesizers to cancel the quantization noise and spurs. This technique has advantages over the dynamic element matching (DEM), also for recovering the input rising edges signals during the reset and improving the frequency effect, delay elements (Des) is inserted in the input and feedback signal paths of PFDs. Simulation results, has been performed to validate the claim.
Category: Digital Signal Processing

[29] viXra:1405.0085 [pdf] submitted on 2014-05-07 05:02:40

Comparative Analysis of Different Methods for the Tuning of Pid Controller

Authors: Rajeev Kumar, Sunil K. Singla, A. Vikram
Comments: 17 Pages.

A proportional integral derivative (PID) controller is most widely used to control industrial processes. Tuning a PID controller is an important task for obtaining the desired closed loop specifications (rise time, settling time, peak time, overshoot and steady state error). This paper presents different PID tuning formulas for a third order process. They are based on the knowledge of the ultimate gain, ultimate period and minimization of integral squared error (ISE) and integral absolute error (IAE).The performance of various tuning methods has been compared by applying a step input to the given process. Simulation results show that tuning a PID controller with Ziegler Nichols (ZN) tuning method results in less rise time (tr), peak time (tP), and integral squared error (ISE). The Relay Auto tuning method is applicable when less ISE is required while Modulus Optimum (MO) tuning method is applicable when less settling time (tS) and less overshoot is required and Computational Optimization (CO) method is helpful when the desired closed loop specifications are decided by the designer. The robustness factors gain margin (GM), phase margin (PM), gain crossover frequency, phase crossover frequency and stability are considered. The proposed approach is implemented in MATLAB.
Category: Digital Signal Processing

[28] viXra:1405.0084 [pdf] submitted on 2014-05-07 05:03:25

Projective Geometry Method in the Theory of Electric Circuits with Variable Parameters of Elements

Authors: Alexandr Penin
Comments: 17 Pages.

Projective geometry is used for interpreting of circuit regime changes and mutual influence of loads. The changes of regime parameters are introduced through the cross ratio of four points. The formulas of the recalculation of the currents, which possess the group properties at change of conductivity of the loads, are obtained. The projective coordinates allows receiving the equation of the network in a normalized form as well as to define the scales for the currents and conductivity of the loads. This approach makes it possible to compare the regime of different circuits. The given approach is applicable to the analysis of «flowed » form processes of various physical natures.
Category: Digital Signal Processing

[27] viXra:1405.0083 [pdf] submitted on 2014-05-07 05:04:20

A Semi-Analytical Drain Current Deflection Model for the Symmetric Pocket Implanted N-Mosfet Using Lorentz Force Analysis

Authors: Muhibul Haque Bhuyan, Fouzia Ferdous, Quazi D M Khosru
Comments: 13 Pages.

This paper introduces the effect of magnetic field upon the deflection of the subthreshold drain current of the symmetric pocket implanted n-MOSFET. The symmetric pocket implanted n-MOSFET’s surface potential, threshold voltage, electron mobility and subthreshold drain current models are used to study the effect of magnetic field on the subthreshold drain current deflection in the inversion channel. Magnetic field strength is varied from ±200 mT to ±250 mT. Results verify the theoretical derivations. This model can be used if short channel n-MOSFETs are used to develop the Magnetic FET Sensors (MFS) that have many practical applications.
Category: Digital Signal Processing

[26] viXra:1405.0082 [pdf] submitted on 2014-05-07 05:05:28

Comparative Evaluation of SPWM Based 3 Level And 5 Level NPC Inverters with Reduced Switching Stress

Authors: Nanditha Sundaresan, Harisankar M A, Noby George, TVVS Lakshmi, Umashankar S, Kothari D P
Comments: 12 Pages.

The pulse sequence required for an NPC Inverter for 3 level and 5 level output is identified and is generated SPWM technique . The same pulses are generated using DSP F28335 kit and validated using a Digital Storage Oscilloscope. This project analyses multicarrier PWM methods for a single phase and three phase three level and five-level Neutral Point Clamped inverters. The advantages of a DSP based SPWM generation over conventional SPWM pulse generation are also studied. Using multilevel inverters, we get an output more sinusoidal, and hence having less harmonic content. But since the number of devices is more, the losses will be more compared to normal inverters, which can be reduced by employing space vector based PWM techniques or sinusoidal PWM based techniques. In this project, a multi-carrier based control technique is developed by the insertion of a zero voltage portion between every two half cycles.
Category: Digital Signal Processing

[25] viXra:1405.0081 [pdf] submitted on 2014-05-07 05:06:33

Mass Detection in Lung CT Images by Using Graph Classification

Authors: Atiyeh Hashemi, Abdol Hamid Pilevar
Comments: 10 Pages.

Lung cancer is the most common fatal malignancy in both men and women. Early detection and treatment of lung cancer can drastically improve the survival rate of patients. Therefore, there is a great need for a new technology to diagnose the lung cancer in its early stages. In this area, Computerized tomography (CT) is considered as the best imaging modality for identification of anatomy's defect. There are a lot of medical image processing software tools for research and diagnostic aims, including data gathering in image and algorithms for analysis of the new images and eventually for testing the systems result. To achieve this and to diagnose the area of the cancer mass, two methods are presented in this paper, and the area of abnormality space is calculated. One of the techniques for diagnosing unusual mass is Graph classification method. In this paper, component of images are classified and displayed as a set of points and edges with graph method. In the other method, changes in colors in the surrounding area are examined. In the end, the results of the two techniques are compared and the accuracy of the algorithm is tested. Experiments show that the proposed method has improved significantly in mass detection and the sensitivity of the proposed system is up to 90%, which shows that the proposed method can help the radiologists to increase their diagnostic confidence.
Category: Digital Signal Processing

[24] viXra:1405.0080 [pdf] submitted on 2014-05-07 05:07:48

A Novel Algorithm for Optimum Balancing Energy Consumption LEACH Protocol Using Numerical Simulation Technique

Authors: Avadhesh Kumar Maurya, Vishwa Nath Maurya, Diwinder Kaur Arora
Comments: 19 Pages.

In this paper we have explored an optimization algorithm using Matlab for balancing energy consumption LEACH protocol to prolong the lifetime of network. In wireless sensor network (WSN), each node has limited energy resources and the lifetime of network is one of the most critical issues in WSNS. Because LEACH protocol has some defects including indefinite and unevenly distributed cluster heads. By studying the energy consumption of nodes and cluster heads on data acquisition and transmission, we propose Balancing Energy Consumption LEACH (BEC-LEACH) protocol to prolong the lifetime of the network. The protocol proposed in the present paper aims to study the clustering algorithm and take geographical location and remaining energy of nodes as the leading feature for cluster heads selection. The simulation results explored in this paper show that BEC-LEACH algorithm can more effectively balance the energy consumption of nodes and prolong the lifetime of network compared with LEACH.
Category: Digital Signal Processing

[23] viXra:1405.0079 [pdf] submitted on 2014-05-07 05:09:02

Dynamic Test Case Design Scenario and Analysis of Module Testing Using Manual vs. Automated Technique

Authors: Vishwa Nath Maurya, Rajender Kumar Bathla, Avadhesh Kumar Maurya3, Diwinder Kaur Arora
Comments: 22 Pages.

Present paper deals with problems of software testing. Software can be tested either manually or automatically. The two approaches are complementary: automated testing can perform a huge number of tests in short time or period, whereas manual testing uses the knowledge of the testing engineer to target testing to the parts of the system that are assumed to be more error-prone. Despite of this contemporary, tools for manual and automatic testing are usually different, leading to decreased productivity and reliability of the testing process. Auto test is a testing tool that provides a “best of both worlds” strategy: it integrates developers’ test cases into an automated process of systematic contract-driven testing. This allows it to combine the benefits of both approaches while keeping a simple interface, and to treat the two types of tests in a unified fashion: evaluation of results is the same, coverage measures are added up, and both types of tests can be saved in the same format. In this paper, our objective is to discuss the importance of automation tool; associated to software testing techniques in software engineering. We provide introduction of software testing and describe the case tools along with solution of software testing problem which leads to a new approach of software development known as software testing in the wide field of Information Technology
Category: Digital Signal Processing

[22] viXra:1405.0078 [pdf] submitted on 2014-05-07 05:09:50

Investigation of Direct Coupled Induction Generator Performance under Normal and Fault Conditions-Modelling and Simulation

Authors: Umashankar S, Sujyothi P, Nithya V G, Vijayakumar D, Kothari D P
Comments: 12 Pages.

This paper shows an induction generator based wind power generation. This system has the voltage source converter excited induction generator for wind power generation. This is one of the investigations of possible combination of the induction generator for wind power and the power electronics equipments. Induction generator is popularly used for the wind power generation. The disadvantages of it are impossible to generate power at the lower rotor speed than the synchronous speed. To compensate this disadvantage, expensive synchronous generator with the permanent magnets sometimes used. In proposed system, the VSC is used to convert the real power from the induction generator to the intermediate dc power, while the reactive power necessary to excite the induction generator is supplied from grid side through VSC only. For the proposed system the future work may be extended by using the diode rectifier in parallel with low rated VSC. The diode rectifier converts real power from the induction generator, the reactive power is supplied from grid through the lower rated VSC. Thus the rating of the expensive VSC is minimized and total cost of the wind power generation system is decreased compared to the existing system with induction generator and synchronous generator.
Category: Digital Signal Processing

[21] viXra:1405.0077 [pdf] submitted on 2014-05-07 05:10:39

Full Scale Converter Fed Induction Generator Based Wind Energy Conversion System Using Indirect Vector Control Strategy

Authors: Umashankar S, Ambili Mathew, Kothari D P, Vijayalumar D
Comments: 14 Pages.

This paper presents the indirect vector control for induction generator driven by a variable speed wind turbine. In wind power induction generator as the input wind is not constant and is not controllable, the induction generator should be provided with specific control strategies so that the dc link voltage is maintained constant irrespective of the variation in wind speed. In this vector control method, direct axis current component is controlled by controlling flux and quadrature axis current component is controlled by controlling torque. A PI-controller is used to process the error values i.e. the difference between the reference values and the measured values. These direct and quadrature axis components of current are converted to three phase quantities with help of unit vector. This reference three phase currents is given to pwm converter which will produce the pulses. In this way, the dc bus voltage is maintained constant irrespective of variation in the wind speed. The proposed system is simulated using MATLAB/Simulink software.
Category: Digital Signal Processing

[20] viXra:1405.0076 [pdf] submitted on 2014-05-07 05:11:32

Modelling and Simulation of An Induction Generator Fed Power Factor Correction Converter for Wind Power Generation Using Duty Factor Modulation

Authors: Umashankar.S, Sreedevi T.S, Vijayakumar D, Kothari D P
Comments: 9 Pages.

This paper presents the modified induction generation system for wind power generation. The induction generator is excited by the voltage source converter and the power factor corrected converter (PFC) is useful for the real power transfer. For minimizing the dc/ac side peak currents, the duty factor modulation control algorithm is used. This system is simulated in MATLAB/SIMULINK software. By reducing the peak currents, the cost of the voltage source converter can be reduced and total system cost can be minimized.
Category: Digital Signal Processing

[19] viXra:1405.0075 [pdf] submitted on 2014-05-07 05:12:51

Analysis of Energy Saving for Air-Cooled Scroll Chiller with Variable Speed

Authors: Yung-Chung Chang, Chun-Lei Tuan, Jyun-Ting Lu, Ching-Wei Chen, Tien- Shun Chan, Cheng-Wen Lee
Comments: 17 Pages.

This paper is to study the variable frequency control against the compressor and the cooling fan of an air-cooled chiller, and continues to measure and collect the actual operating data, by use of such data as the chilled water supply/return temperature, chilled water flow rate, power consumption, and ambient wet-bulb temperature to conduct the COP analysis of the air-conditioning system. The experimental results show that proper use of the frequency converter to change the operation frequency of the compressor and of the cooling fan indeed can effectively enhance the COP of the air-cooled chiller operation, and reduce the power consumption of the compressor and the cooling fan of the air-cooled chiller to achieve the energy-saving effect.
Category: Digital Signal Processing

[18] viXra:1405.0074 [pdf] submitted on 2014-05-07 05:14:15

An Intelligent Estimator for Reactor Switching Studies

Authors: Iman Sadeghkhani, Najmeh Sadat Monajemi, Homa Khosravian2, Reyhane Monajemi, Maziar Rezaeirad
Comments: 14 Pages.

In this paper an intelligent approach is proposed to evaluate switching overvoltages caused by shunt reactor energization by applying analytical rules. In a small power system that appears in an early stage of a black start of a power system, an overvoltage could be caused by core saturation on the energization of a reactor with residual flux. An artificial neural network (ANN) has been used to estimate the overvoltages due to shunt reactor energization. Three learning algorithms, delta-bar-delta (DBD), extended delta-bar-delta (EDBD) and directed random search (DRS), were used to train the ANNs. Equivalent circuit parameters of network have been used as ANN inputs; thus developed ANN is applicable to every studied system. The developed ANN is trained with the worst case of the switching angle and remanent flux, and tested for typical cases. The simulated results for a partial of 39-bus New England test system show that the proposed technique can measure the peak values and duration of switching overvoltages with good accuracy and EDBD algorithm presents best performance.
Category: Digital Signal Processing

[17] viXra:1405.0073 [pdf] submitted on 2014-05-07 05:15:01

Capacity Analysis of Mimo (8X8) System with or Without Csi Under Different Wireless Fading Channels

Authors: Vivek Mankotia, Ankush Kansal
Comments: 23 Pages.

The growing demand of Multimedia based services and growth of data requirement of wireless application lead to increasing interest to high speed communication. MIMO (Multiple input and multi output system) are today considered as one of most important research area of wireless communication. Because multimedia application requires higher data rate which can be possible by MIMO (8x8) system. In this paper the capacity of (8x8) has been measured in the term of Channel capacity. This paper calculate the channel capacity with CSI or without CSI at transmitter. Paper calculate the ergodic capacity, outage capacity and channel capacity in presence of correlation. There is also work regarding to analysis of BER for (8x8)MIMO system.
Category: Digital Signal Processing

[16] viXra:1405.0072 [pdf] submitted on 2014-05-07 05:15:38

Data Scrambler for Ultra-Wideband Communication Systems

Authors: Davinder Pal Sharma
Comments: 8 Pages.

Indoor communications of any digital data, whether it is high-speed signals carrying multiple HDTV programs or low-speed signals used for timing purposes, will be shared over a digital wireless network in the near future. Such indoor and home networking requires high data rates, very low cost and very low power consumption. Ultra Wide-band (UWB) system has enormous bandwidth to provide a promising solution to satisfying these requirements and becomes an attractive candidate for future wireless indoor networks. In such systems, synchronization plays very critical role to ensure correct and reliable system operation. Improper synchronization can introduce timing errors during transmission that can be eliminated using a device called scrambler. Simulation and implementation of data scrambler for UWB communication systems is discussed in the present paper. Model of the scrambler is build using Matlab to perform simulation. For FPGA (Field Programmable Gate Array) based implementation of UWB scrambler, Xilinx’s System Generator for DSP (Digital Signal Processing) tool is used along with Xilinx’s ISE Design Suite. Implementation and simulation results are then compared.
Category: Digital Signal Processing

[15] viXra:1405.0071 [pdf] submitted on 2014-05-07 05:16:25

Comparison of Regimes of Active Two-Port Networks with Stabilization of Load Voltages

Authors: Alexandr Penin
Comments: 18 Pages.

The problem of normalization of circuit regime parameters, choice of characteristic regimes and scale values is considered. Disadvantages of traditional normalization are shown. The method of projective coordinates reveals the characteristic regimes and proves the normalized expressions. The examples of recalculation of regime parameters are given for comparable circuits. The obtained results allow to carry out the analysis and to compare regimes of similar active two-port networks. The given approach is applicable to “flowed” form processes of different engineering areas.
Category: Digital Signal Processing

[14] viXra:1405.0070 [pdf] submitted on 2014-05-07 05:38:34

Analysis of Common DC Link in VSI fed Multi-motor Drives

Authors: Amit Biswal, Sai Ram Reddy Bhavanam, Umashankar S
Comments: 16 Pages.

VSI fed Induction Motor Drives forms the major part of Heavy Industries wherein the machine tools are supposed to possess varying speed. With increase in the number of machine tools in the industrial workshop, the number of induction motor drives increases. Size and space complexity involved with single huge motor limits its usage in the Industry where expansion in capacity is being planned. This necessitates the use of multi motor drives fed from Voltage Source Inverter connected to a common DC link. In this paper a multi-motor drive system has been simulated and simulation results were analyzed and compared based on the output waveforms of various performance parameters of an Induction Motor drive.
Category: Digital Signal Processing

[13] viXra:1405.0069 [pdf] submitted on 2014-05-07 05:39:33

Voltage Regulation of Wind Induction Generator

Authors: Babaria Pritul, Swaati Sawaikar, Umashankar S
Comments: 12 Pages.

This project focuses on how to reduce the voltage variations, on a self -excited induction generator, which is caused due to variations in load. A real time model of such a circuit is simulated using MATLAB/Simulink and the changes in voltage for many different resistive loads are recorded. The voltage control is achieved adding series capacitors. This control strategy is implemented using MATLAB/Simulink.
Category: Digital Signal Processing

[12] viXra:1405.0068 [pdf] submitted on 2014-05-07 05:40:29

Passive Coplanar Circulator with the Yig Thin Films

Authors: Rahmouna El-Bouslemti, Faouzi Salah-Belkhodja
Comments: 10 Pages.

This paper presents the design and analysis of a new triangular structure of a coplanar circulator using a coplanar topology (CPWG) in the X band frequency. Design and simulation were performed by the ANSOFT HFSS simulator based on the finite element methods. The design is a topology with its planar conductors in the same plane. As a result, a miniature ciculator at 11 GHz with insertion loss of 0.85 dB and isolation of 20.06 dB has been designed.
Category: Digital Signal Processing

[11] viXra:1405.0067 [pdf] submitted on 2014-05-07 05:41:16

Transient Stability Assessment in the Presence of STATCOM Using Combined Neural Network

Authors: Fariba Rezazadeh Falah Anari, Saeid Niknafs
Comments: 13 Pages.

In this paper we have tried to introduce a model for transient stability prediction of a power system with a Static Compensator (STATCOM) to add a contribution to the subject. For this reason we applied so called, Committee Neural Networks (CNNs) methods as tools for Transient Stability Assessment (TSA) of power system. Transient stability of a power system is first determined based on the generator relative rotor angles procured from time domain simulation outputs. Simulations were carried out on the IEEE 9-bus test system with STATCOM considering three phase faults on the system. The data collected from the time domain simulations are then used as inputs to the CNN in which CNN is used as a classifier to determine whether the power system is stable or unstable.
Category: Digital Signal Processing

[10] viXra:1405.0066 [pdf] submitted on 2014-05-07 05:42:31

Vision Based Static Hand Pose, Hand Movement Recognition System For Sign Language Using Eigen Vector Theory In MATLAB

Authors: Sarbjeet kaur, V. K. Banga
Comments: 14 Pages.

This paper presents a vision based system that provides a feasible solution to Indian Sign Language (ISL) recognition of static gestures of alphabets. It deals with images of bare hands, which allows the user to interact with the system in a natural way. An image is processed and converted to a Eigen vector that will be compared with the Eigen vectors of a training set mean of signs. The most important part of the recognition method is a feature extraction process using Eigen value algorithm in MATLAB coding. An image is processed and converted to a feature vector that will be compared with the feature vectors of a training set mean of signs. The system was implemented and tested using a data set of 650 samples of hand sign images; 25 images for each sign. The system recognizes one handed alphabet signs from Indian sign language (ISL). The proposed system achieved a recognition accuracy of 100 %.
Category: Digital Signal Processing

[9] viXra:1405.0065 [pdf] submitted on 2014-05-07 05:43:39

A New Approach for Current-Mode SRD Filters

Authors: Ebrahim Farshidi, Saeed Manoochehri
Comments: 11 Pages.

In this paper a new geometric-mean circuit for current-mode square-root domain filters (SRD) is presented. The geometric-mean circuit employs MOSFET transistors that are operating in both strong inverted saturation and triode regions and works in low supply voltage. Simulation results by HSPICE confirm the validity of the proposed design technique.
Category: Digital Signal Processing

[8] viXra:1405.0064 [pdf] submitted on 2014-05-07 05:44:25

Quality Grading of a Pea Using Artificial Intelligence

Authors: Amrindra Pal, Nirbhow Jap Singh, Sandeep Sharma
Comments: 13 Pages.

In the recent years, computer vision has emerged as a prospective field, related to the recognition of the object by a computer or machine. In the presented work, the application of computer vision to extract the features of a pea is explored. Feature related to pea are shape, texture, and color. The present work analyzes the object, on the basis of surface areas of the pea, computed from different angle. The quality assigning system based on artificial intelligence is developed. The input to back propagation neural network (BPNN) is range data, consisting of surface areas from different views of object. Surface based analysis technique has advantage that the recognition of object becomes simpler and faster. BPNN uses mean square error as a performance index. The selected network models are simulated with available test data, to evaluate the performance. The result shows the effectiveness of the proposed approach to classify the pea on basis of quality.
Category: Digital Signal Processing

[7] viXra:1405.0062 [pdf] submitted on 2014-05-07 05:46:38

Calculation of AC Loss for High Temperature Superconductor Transformers Using Two-Dimensional Finite Element Method

Authors: Asef Ghabeli Juybari, Mohammad Reza Besmi
Comments: 21 Pages.

The AC loss magnitude is one of the most important parameters for High Temperature Superconductor Transformer (HTS) design, which hysteresis loss forms its significant part. Leakage flux density includes two component: radial and axial, which its radial component plays an important role in hysteresis loss magnitude. In this paper, a shell-type HTS transformer with a very common P-S-P winding arrangement has been analyzed using finite element method. It should be mentioned that finite element analysis has been done using Cedrat Flux Ver 11.1 software. Then, hysteresis loss for this kind of winding arrangement has been calculated by means of simulation results.
Category: Digital Signal Processing

[6] viXra:1405.0061 [pdf] submitted on 2014-05-07 05:47:41

Operations Analysis of Isolated And Connected Micro-Grid with CHP Using MIP

Authors: S. Mohammad Hasheminasab, Mohammad Reza Besmi
Comments: 13 Pages.

As energy demands around the world increase, the need for renewable energy sources, such as Micro-Grid (MG) that will not harm the environment has been increased. Micro-Grid has been extensively investigated as a promising solution to energy challenges in 21st century. The optimal generation is one of the important functions for the Micro-Grid operation. It should be noted that supplying thermal load with combined heat and power systems is one of the most evident features of the Micro-Grids which increase the efficiency of the system. In this study, the operation of Micro-Grids by considering two kinds of state i.e. isolated and connected is investigated and the results for these different states are compared together. In addition, the effect of CHP systems in a Micro-Grid and the possibility of collaboration of Micro-Grid in power supply marketing is studied. The results indicate that existences of CHP systems leads to reduction of operating cost; consequently, consumers pay less for energy. So this proposed model is used to reduce the total operating costs. The equations of Micro-Grids are solved using the mathematical analysis which is based on the application of Mixed Integer Programming (MIP).
Category: Digital Signal Processing

[5] viXra:1405.0053 [pdf] submitted on 2014-05-07 00:12:53

Design of Cic Compensation Filter for Decimation Filter

Authors: Seema chaudhary, S.K.Singh2, Nishant Tripathi3
Comments: 7 Pages.

This paper presents the efficient modification in the frequency response of CIC compensation filter. The Compensation filter design consist of FIR filter as cascade after CIC filter. . A FIR filter that has a magnitude response inverse of the CIC filter can be applied to achieve frequency response correction . As proposed filter has only three coefficients so less computation is required. The decimation factor of the CIC filter is M . The performance of the compensation filter depends on the value of a which is obtained by minimizing corresponding error function. Filter coefficient can control the desired pass band droop of the overall decimation filter. The resulting structure is multiplier less and exhibits small pass and droop in comparison to CIC filter. The Cascaded integrator comb filters do not require any multiplier circuits and hence are very economical for implementation in hardware and the problems with cascading faced by the accumulate .A functional model of the CIC compensation filter is developed using the MATLAB program. The paper will describe a mode composed of integrator comb pairs, and it is based on a floating point mathematical algorithm. A series of tests are carried out on this model. Final results show that the CIC compensation filter is a low-pass filter, and its frequency response depends on the number of integrator-comb stages N . As N increases , the CIC compensator has greater stop band attenuation but a less flat pass band. Paper will presented that in the A/D devices no. of analog stages can run at Iower power as compared to digital stages, they are normally more costly because of a number of manufacturing problems in such component.
Category: Digital Signal Processing

[4] viXra:1405.0034 [pdf] submitted on 2014-05-07 03:34:22

Echo Cancellation by Adaptive Combination of Normalized Sub Band Adaptive Filters

Authors: Rekha Saroha, Nirpender Singh, Rohit Anand
Comments: 10 Pages.

In acoustic echo cancellation the highly correlated speech input signal and very large impulse response path of echo signal will slow down the convergence rate of adaptive filters if full band adaptive filter is used. To solve these problems sub band adaptive filters are used. Adaptive combination methods provide an interesting way to improve adaptive filter’s performance. Adaptive combination of normalized sub band adaptive filters is used. In our proposed method, adaptive combination of sub band signals before going to the adaptive filters. Experimental results show that the combination method can obtain both fast convergence rate and small steady state MSE by using less number of adaptive filters by adjusting step size parameter and mixing parameter.
Category: Digital Signal Processing

[3] viXra:1405.0033 [pdf] submitted on 2014-05-07 03:36:01

Compression Artifact Removal Using SAWS Technique Based On Fuzzy Logic

Authors: Sonia Malik, Nripender Singh, Rohit Anand
Comments: 10 Pages.

Many mobile devices compress images to meet limited bandwidth requirements and adopt Block Discrete Cosine Transform. This produces visually annoying artifacts in these highly compressed images. Most of the artifact reduction techniques blur the details of the images while removing coding artifacts. In this paper, we propose a novel and explicit approach for reducing coding artifacts in an image by using the combination of SAWS equation and Fuzzy Rules. We use FIDRM for the detection of noisy pixel and NAFSM filter for correction. Experimental results demonstrate that the proposed approach achieves excellent visual quality and PSNR as compared to a number of deblocking methods in the literature.
Category: Digital Signal Processing

[2] viXra:1405.0032 [pdf] submitted on 2014-05-07 03:37:37

Minimization of Transistors Count and Power in an Embedded System Using Gdi Technique :A Realization with Digital Circuits

Authors: Madhusudhan Dangeti, S.N.Singh
Comments: 10 Pages.

Gate Diffusion Input (GDI) is an advanced technique for low power digital IC design in an embedded system. This technique can be used to reduce power consumption, delay and number of transistors compared to convectional CMOS design. The standard CMOS and several different techniques for circuit design is compared with GDI technique.
Category: Digital Signal Processing

[1] viXra:1405.0031 [pdf] submitted on 2014-05-07 03:38:38

Structure and Room Temperature Ferromagnetism of Ni 2+- doped ZnO Thin film Prepared by Sol-gel Process

Authors: Trilok Kumar Pathak, Prabha Singh, L.P.Purohit
Comments: 10 Pages.

In this study, Ni doped ZnO (Zn1-xNixO, x= 0.02, 0.04, 0.07) Diluted magnetic semiconductors (DMSs) thin films onto Si substrates by spin-coating method from a precursor solution containing zinc acetate dissolved in methanol. After deposition, these films were preheated at 3500C for five minute and then annealed at 5500C for three hour for crystallize. Scanning Electron microscopy (SEM) image shows the particle size with an average size of 250 nm. The analysis of X-ray diffraction (XRD) identified that the impurity phase is observed when the Ni content x reaches 0.07. With the increment of x, wurtzite structures degrade gradually. The magnetic properties are measured using Vibrating Sample Magnetometer (VSM) at room temperature; the Zn1-xNixO (x=0.07) thin film shows ferromagnetism. The magnetic moment depends on Ni concentration and increases continuously as Ni concentration increases.
Category: Digital Signal Processing