per Iranian Research Institute for Electrical Engineeringفصلنامه مهندسی برق و مهندسی کامپيوتر ايران16823745168237452025-04224264270articleMohamad Youness Ansarey Movahedyounessansarey@gmail.com1M. R. Motavalli Kasmaiemotavallireza@gmail.com2Elec. Eng. Dept., Faculty of Engineering, University of Qom, Qom, IranElec. Eng. Dept., Faculty of Engineering, University of Qom, Qom, Iran<p style="direction: ltr;">In this paper, the third-order (3IMD) and fifth-order (5IMD) distortion components of a high-power radio frequency nonlinear amplifier are reduced by the predistortion method and by generating cubic distortion using a MOSFET transistor. The predistortion method has many applications in linearizing high-power radio frequency amplifiers for telecommunication systems. The structure of this method is not complicated and can be easily used for linearizing nonlinear amplifiers. In this method, a distortion is placed as a complementary distortion at the input of a nonlinear amplifier to linearize the nonlinear amplifier by adding two distortions (i.e., the distortion caused by the nonlinear amplifier itself and the complementary distortion caused by another nonlinear element). Although the amount of linearization with this method is not very significant, this amount of linearization is sufficient for many telecommunication systems. The main advantage of this method is the simplicity of the circuit, high efficiency, and the ability to linearize over a relatively large frequency bandwidth. In this paper, the linearization value of the third and fifth order distortion signals of high power amplifiers is improved compared to previous similar works, and the results are shown using ADS software.</p>http://ijece.org/Article/44163Nonlinear high power amplifier predistortion method third and fifth order distortion cubic distortionper Iranian Research Institute for Electrical Engineeringفصلنامه مهندسی برق و مهندسی کامپيوتر ايران16823745168237452025-04224277281articleابراهیم ابراهیم زادهebrahimebrahimzadehgonbady@gmail.com1Amir Fathia.fathi@urmia.ac.ir2Behboud Mashoufib.mashoufi@urmia.ac.ir3Microelectronics Research Laboratory, Urmia University, Urmia, IranMicroelectronics Research Laboratory, Urmia University, Urmia, IranMicroelectronics Research Laboratory, Urmia University, Urmia, Iran<p style="direction: ltr;">Compressors play an essential role in multipliers because they consume the most power and speed in the circuit. Gate Diffusion Input (GDI) technique has been used to design and implement low power circuits. This technique plays an important role in reducing power and increasing speed. The gates used to implement these compressors (GDI) show an improvement in the number of transistors used, power and speed, which can be realized by a simple comparison with CMOS static logic. In this article, some of the important structures of compressors have been implemented by the desired technique (GDI) and the obtained results have been stated. These implementations have been tested under the same conditions, and we will see an improvement in overall performance.</p>http://ijece.org/Article/47037Compressor gate diffusion input (GDI) multiplier ripple carry adder full adder half adder partial product final adder booth algorithm logic gates.per Iranian Research Institute for Electrical Engineeringفصلنامه مهندسی برق و مهندسی کامپيوتر ايران16823745168237452025-04224225240articleAhmad EntezariAhmad_entezari6@yahoo.com1Arash Dehestani Kolagara_dehestani@mut.ac.ir2Mohammad Reza Alizadeh Pahlavanimr_alizadehp@mut.ac.ir3Malek-Ashtar University of TechnologyFaculty of Electrical & Computer Engineering, Malek Ashtar University of Technology, Tehran, Iranدانشگاه صنعتی مالک اشتر<p>BLDC motors are used in various industries due to their efficiency, reliability and controllability. Among these applications, electric and hybrid vehicles, robotics and automation systems, residential electronics, aerospace industries, medical equipment, wind turbines and solar systems can be mentioned. In many of these applications, dynamic motor speed control is needed. In this paper, due to the importance of the subject, at first, by applying the PLECS software and using the PWM method along with the PID controller, the simulation of the dynamic speed control of the BLDC motor with dynamic speed references is performed, and then, the experimental implementation of the BLDC motor drive using Arduino Mega microcontroller board, in the conditions of dynamic changes of speed references, is accomplished and the corresponding results are presented. Labview software is used to display and record speed data on the computer. The simulation and experimental results show that the BLDC motor has good efficiency in tracking the dynamic speed references up to the dynamic frequency of 0.3 Hz.</p>http://ijece.org/Article/47224BLDC motor Electronic commutation Dynamic speed control Arduino Mega boardper Iranian Research Institute for Electrical Engineeringفصلنامه مهندسی برق و مهندسی کامپيوتر ايران16823745168237452025-04224257263articleSM Momenima__momeni@elec.iust.ac.ir1HadiShahriar Shahhoseinishahhoseini@iust.ac.ir2Elec. Eng. School, Iran University of Science and Technology, Tehran, IranElec. Eng. School, Iran University of Science and Technology, Tehran, Iran<p style="direction: ltr;">Voltage scaling is a widely used technique for energy saving, which increases the delay in the network in MPSoCs. To overcome this challenge, the volume of communication in the network should be reduced. In memory-intensive and communication-intensive applications, a considerable part of the network delay is due to the traffic originated from cache misses. In this paper, we employ the voltage scaling method in an adaptive way, while the free space of the NoC input buffers is used to reduce the traffic caused by the cache misses. Therefore, the proposed method increases the memory efficiency and reduces the energy consumption of the chip. To have an adaptive approach, the voltage is adjusted according to the average amount of free space of the NoC buffers, and the voltage scaling stops when the buffers are close to full. We achieve a 16% reduction in miss penalty on average, and a 12.5% improvement in power consumption.</p>http://ijece.org/Article/47264Multiprocessor system on chip data management cache memory energy savingper Iranian Research Institute for Electrical Engineeringفصلنامه مهندسی برق و مهندسی کامپيوتر ايران16823745168237452025-04224241256articlePeyman Mirzaeipourpm.em33@gmail.com1Syed Qudrat Allah seifosadatseifosadat@yahoo.com2Mohsen Sanieimohsen.saniei@gmail.com3S. S. Mortazavimortazavi_s@scu.ac.ir4Electrical Research Department, Faculty of Engineering, Shahid Chamran University, Ahvaz, IranShahid Chamran University of AhvazShahid Chamran University of ahvaz<p style="direction: ltr;">This paper proposes a modified predictive current control (PCC) method based on optimal virtual voltage vectors (VV-PCC) with simultaneous control and regulation of two subspaces in a six-phase converter for permanent magnet synchronous machines (PMSM). This method leads to minimizing harmonic distortion of the current compared to other methods. In addition, it is possible to control the operation of a six-phase PMSM with an unbalanced current between two sets of windings. Finally, the dual subspace PCC method (BS-PCC) based on virtual vectors with optimal amplitude is adopted, which, by selecting an appropriate switching pattern, can both reduce the amount of unwanted harmonics and provide fast dynamic response and acceptable torque response. Also, since the selection of modes in the PCC can lead to harmonic Circulating current in the machine windings; This problem can be solved by the proposed method by minimizing the weighting factor, which requires a small number of iterations in switching the six-phase converter. The validation of the article was carried out using MATLAB software on a prototype machine.</p>http://ijece.org/Article/47556Six-phase permanent magnet synchronous machines (PMSM) modified predictive current control (PCC) virtual voltage vectors optimal switching cost function minimization.per Iranian Research Institute for Electrical Engineeringفصلنامه مهندسی برق و مهندسی کامپيوتر ايران16823745168237452025-04224271276articleH. R. Pairohpairo@nri.ac.ir1Farzad Bodaghif_bodaghi@alumni.iust.ac.ir2Niroo Research Institute, Tehran, IranElec. Eng. School, Iran University of Science and Technology, Tehran, <p style="direction: ltr;">The inaccurate estimation of the initial rotor position in a synchronous reluctance motor can lead to reduced starting torque and slower rotor speed response at startup. Various methods have been proposed to estimate the initial rotor position of the synchronous reluctance motor, which can be categorized based on complexity, implementation, and estimation accuracy. Some of these methods, despite their high implementation complexity, reduce the error in estimating the initial rotor position. On the other hand, some methods are advantageous due to their low computational burden and ease of implementation, but they exhibit a higher error in estimating the initial rotor position, with some methods showing errors of up to 30 degrees. This paper examines the impact of initial rotor position estimation errors on the performance of synchronous reluctance motors from various aspects. To analyze the effect of estimation errors on the motor's parameters, errors of 0, 10, 20, and 30 degrees in initial rotor position were applied, and the resulting impact on parameters such as electromagnetic starting torque and rotor speed response time to the reference speed were investigated. The simulation results were presented using MATLAB/Simulink software.</p>http://ijece.org/Article/48343Initial rotor position estimation synchronous reluctance motor electric motor drives speed sensor.