فهرست مطالب

Majlesi Journal of Telecommunication Devices
Volume:10 Issue: 2, Jun 2021

  • تاریخ انتشار: 1400/04/07
  • تعداد عناوین: 6
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  • Pouria Etezadifar*, Saeed Talati Pages 55-59

    With the end of World War II and the rapid advent of war technology, wars have shifted to electronic warfare, and today a nation can win wars that are more powerful in the field of telecommunications and electronic warfare. The purpose of this article is to promote new content in the field of electronic warfare and we try to introduce and introduce new techniques of electronic attacks on victim radar systems. With the exception of false targets created by point or sweep jams, most false targets are created with automatic responders or repeaters. An automatic response generator for producing false targets includes a receiver, a variable delay circuit, a signal generator, a power amplifier, and an antenna. Upon receiving a pulse from the threatening radar, the transponder waits for the time corresponding to the target man's distance to the false target, and then sends a similar echo signal to the radar. . As soon as the pulse is received from the threatening radar, the transponder delays it sufficiently to cause the difference in distance to create a false target. Then, a pulse similar to the RF echo pulse of the radar is returned to it.

    Keywords: Electronic Attack, Electronic Warfare, Information, Electronic Support
  • Houman Akbarzade KhoshkeRood*, Seyed Mohammad Alavi Pages 61-66

    e theory. With the help of this mathematical tool, the decision-making process between two or more decision-makers can be examined and the results can be analyzed. It is also possible to observe the effect of various parameters involved in the result of the problem, and to plan the result in the desired direction. In this paper, selecting the best response in different stages of the conflict to solve various such problems is achieved and the main purpose is to present a new approach to adopt a strategy and select the radar and disruptive coping technique in case of incomplete information from each other, using a method It is mathematical and algorithmic, so that we have a better performance in the benefit function of the parties.

    Keywords: Modeling, Scenario, Electronic Warfare, Radar
  • Ali Rahnamaei* Pages 67-73

    In this paper, a novel high performance structure has been demonstrated which can be widely used for circuit-level realization of radix-4 Booth scheme. The notable privilege of proposed scheme is its higher speed for generation of Partial Products (PPs) compared to the previous designs. The objective has been achieved by means of the modified truth table of Booth algorithm. Moreover, Pass-Transistor Logic (PTL) has been employed to reduce the middle stage capacitances which has considerably enhanced the operating frequency of the designed architecture. The thorough analysis over previously reported works has also been provided to help the authors for optimized implementation of the Booth circuitry. Simulation results for TSMC 0.18µm CMOS technology and 1.8V power supply using HSPICE indicate the correct operation of the proposed scheme. In addition, the best-reported works have been redesigned and simulated on the same conditions to provide a fair comparative environment with our designed scheme. The results demonstrate the superiority of our circuit over the selected structures.

    Keywords: ParallelMultiplier, Radix-4Booth Algorithm, High-Speed, Partial Product, Low Power
  • Hossein Mohseni* Pages 75-78

    A component or system's output signal level is often the critical factor in the design and ultimately the purchase and performance of almost all RF and microwave equipment. Because signal power level is so important to the overall system performance, it is critical when specifying the component that builds up the system. Most of power sensors convert high frequency power to a DC or low frequency signal that the power meter can then measure and relate it to a certain RF power level. The three main types of sensors for sensing power are thermistor, thermocouple and diode detector. In this paper, we explain a new method used for power measurement in the frequency range of 10MHz to 1GHz. In this method, a D-type flip-flop was used to convert the main signal to a low frequency signal.

    Keywords: Power Meter, Subsampling, Down Conversion, D Flip Flop, Microwave, Measurement Component
  • Seyed Reza Nabavi*, Mehdi Najafi Pages 79-86

    Wireless Sensor Networks (WSNs) is one of the most important types of networks in the world where sensors collect information within a specific area and send the data to a central point called the Base Station (BS). Many researchers have attempted to develop or improve the performance of WSNs by trying to mitigate the limitations and challenges facing WSNs. The most important challenge is to reduce energy consumption in a limited battery power supply of sensor nodes. Energy is consumed by sensor nodes in WSNs to perform three significant functions namely data sensing, transmitting and relaying. Various energy-saving routing protocols have been proposed to solve this problem to maintain the lifetime of the network for longer periods. In this paper, we propose an optimal routing protocol using multi-objective cultural algorithm for wireless sensor networks (ORPMCA). The simulation results showed that the ORPMCA protocol extends the lifetime of the WSN compared to other protocols by 15%.

    Keywords: Multi-Objective Cultural Algorithm, Wireless Sensor Networks, Routing Protocol
  • Nadia Khiadani Pages 87-95

    Extensive use of communication and information technologies has led to the introduction of different generations of mobile communications. The first to fourth generations (1G-4G) of communication are fully recognized in the world, the fifth generation (5G) is gradually being implemented in different countries, and studies and research on the sixth generation (6G) are in the early stages. The development and deployment of the new generation of mobile communication will have a significant influence on the development and presentation of mobile communications. In this paper, a brief review of the development trend of mobile communication generations with a focus on 5G and especially 6G has been done with respect to the visions, technologies, challenges and issues related to these two generations.

    Keywords: ons, wireless networks, 5G, 6G