• Title/Summary/Keyword: wireless design

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Rapid Implementation of the MAC and Interface Circuits fot the Wireless LAN Cards Using FPGA

  • Jiang, Songchar
    • Journal of Communications and Networks
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    • v.1 no.3
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    • pp.201-212
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    • 1999
  • This paper studies the rapid design and implementation of the medium access control(MAC) and related interface circuits for 802.11 wireless LANs based on the field programmed gate ar-ray(FPGA) technology. Our design is thus aimed to support both the distributed coordination function (DCF) and the point coordination function(PCF) with the aid of FPGA technology. Further-more, in an infrastructure network, some stations may serve as the access points (APs) which may function like a learning bridge. This paper will also discuss how to design for such application. The hardware of the MAC and interface may at least consist of three major parts: wireless transmission and reception processes and in-terface, host(bus) interface, and the interface to the distributed system (optional). Through the increasing popularity of FPGA de-sign, this paper presents how Complex Programmable Logic De-vices(CPLD) can be utilized for speedy design of prototypes. It also demonstrates that there is much room for low-cost hardware prototype design to accelerate the processing speed of the MAC control function and for field testing.

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Design Methodology of 500 W Wireless Power Transfer Converter for High Power Transfer Efficiency (500 W 급 무선전력전송 컨버터의 고효율 설계 방법)

  • Kim, Mina;Park, Hwapyeong;Jung, Jee-Hoon
    • The Transactions of the Korean Institute of Power Electronics
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    • v.21 no.4
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    • pp.356-363
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    • 2016
  • The design methodology of an adequate input voltage and magnetizing inductance to minimize reactive power is suggested to design a wireless power transfer (WPT) converter for high-power transfer efficiency. To increase the magnetizing inductance, the turn number of the WPT coil is increased, thus causing high parasitic resistance in the WPT coil. Moreover, the high coil resistance produces high conduction loss in the transfer and receive coils. Therefore, the analysis of conduction loss is used in the design of the WPT coil and the operating point of the WPT converter. To verify the proposed design methodology, the mathematical analysis of the conduction loss is presented by experimental results.

Design of Resonator-Coupled Wireless Power Transfer System by Use of BPF Theory

  • Awai, Ikuo;Ishida, Tetsuya
    • Journal of electromagnetic engineering and science
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    • v.10 no.4
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    • pp.237-243
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    • 2010
  • A wireless power transfer system based on magnetically coupled two resonators is analysed using the filter theory. Design equations for each lumped parameter circuit components are derived. As a result, change of coupling coefficient between the resonators and/or change of load resistance are easily responded. Effect of circuit loss to the design theory is also addressed. After designing a power transfer system, a real system is constructed using spiral and loop coils. Dependence of circuit elements on their dimensions is measured in advance and used to cope with the designed element values. Simulated response by use of designed element values and measured result are compared, indicating the validity of the theory.

Design of Waveguide Dielectric Rod Antenna for Shaping, FTEP (Flat-topped Element Pattern) for HAPS

  • Kim Yang Su;Kang Byung Su;Ku Bon lun
    • Proceedings of the IEEK Conference
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    • 2004.08c
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    • pp.880-882
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    • 2004
  • This paper presents the design and simulation results of 7 waveguide dielectric rod array antennas for 7 channel DBF(Digital beamformer) receivers for stratospheric system. A waveguide. dielectric antenna type, which has FTEP(Flat-toped element pattern) to manufacture easily. Also, the calculated element patterns according to the permittivity are compared. The designed antenna will be used for generating multibeam radiation pattern by means DBF.

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An adaptive MAC protocol exploiting multiple paths in wireless mesh networks

  • Lee, Hyung-Keun;Yi, Joon-Hwan
    • Journal of IKEEE
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    • v.13 no.1
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    • pp.94-100
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    • 2009
  • In recent years, the wireless mesh network (WMN) has been an emerging technology to provide Internet access to fixed and mobile wireless devices. The main goal of this paper is the design and simulation of a new MAC protocol based on the multi-path routing information for wireless mesh networks. The information about multiple paths discovered in the network layer is exploited by the MAC layer in order to forward a frame over the best hop out of multiple hop choices. The performance of our approach is compared with conventional 802.11 MAC through the simulation. The results show that our scheme exhibits a significantly better performance rather than conventional 802.11 MAC protocol in terms of packet overhead, end-to-end throughput and delay.

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Development Methods and Design of a Wireless CCTV System based on the Binary-CDMA Technology (Binary CDMA 기반의 무선 CCTV 시스템의 개발방법 및 설계)

  • Choi, Jae-Won
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.15 no.2
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    • pp.322-330
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    • 2011
  • Binary CDMA is a new standard technology for wireless communication developed by our country that makes high speed communications and good quality of services. In this paper we researched the development methods and design of a wireless CCTV System based on the Binary-CDMA technology that makes it freely installed in any place without cables and laying works.

Design and Implementation of a Simulation Framework for Wireless Data Broadcasting based on Data ID Space Partition

  • Im, Seokjin
    • International journal of advanced smart convergence
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    • v.7 no.4
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    • pp.10-18
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    • 2018
  • For the information services supporting requests of data items from a great number of mobile clients, wireless data broadcasting is an effective way because it can accommodate any number of clients. In the wireless data broadcasting, various air indexing schemes and data scheduling schemes have been developed in order to enable the clients to access their desired data items efficiently. The broadcasting system needs a method to simulate newly designed air indexing and scheduling schemes of the system, and to evaluate the performance parameters of the schemes. In this paper, we design an expandable and efficient simulation framework for the wireless data broadcasting based on the partition of data ID space. The framework can adopt regular and irregular space partition and evaluate various performance parameters of the broadcasting system. We implement a testbed of the broadcasting system using the framework, that adopts IIP, GDI and EXP as its air indexing schemes. We simulate the system using the testbed and evaluate the performance parameters of the system. Thus, we show the efficiency and expandability of the designed and implemented framework.

A new Network Coordinator Node Design Selecting the Optimum Wireless Technology for Wireless Body Area Networks

  • Calhan, Ali;Atmaca, Sedat
    • KSII Transactions on Internet and Information Systems (TIIS)
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    • v.7 no.5
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    • pp.1077-1093
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    • 2013
  • This paper proposes a new network coordinator node design to select the most suitable wireless technology for WBANs by using fuzzy logic. Its goal is to select a wireless communication technology available considering the user/application requirements and network conditions. A WBAN is composed of a set of sensors placed in, on, or around human body, which monitors the human body functions and the surrounding environment. In an effort to send sensor readings from human body to medical center or a station, a WBAN needs to stay connected to a local or a wide area network by using various wireless communication technologies. Nowadays, several wireless networking technologies may be utilized in WLANs and/or WANs each of which is capable of sending WBAN sensor readings to the desired destination. Therefore, choosing the best serving wireless communications technology has critical importance to provide quality of service support and cost efficient connections for WBAN users. In this work, we have developed, modeled, and simulated some networking scenarios utilizing our fuzzy logic-based NCN by using OPNET and MATLAB. Besides, we have compared our proposed fuzzy logic based algorithm with widely used RSSI-based AP selection algorithm. The results obtained from the simulations show that the proposed approach provides appropriate outcomes for both the WBAN users and the overall network.

(Design and Implementation of A Contents Converter for Integrated Wired and Wireless Platform Based on Mobile) (Mobile 기반의 유무선 플랫폼 통합 컨텐츠 변환기 설계 및 구현)

  • 윤성일;송정길
    • Journal of the Korea Computer Industry Society
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    • v.3 no.9
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    • pp.1295-1314
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    • 2002
  • Recently, wireless internet market has reached to the induction and growth stage by rapid development of Mobile service by fusion of Internet and wireless technology of communications. But, current wireless internet service of domestic five mobile communication companies are being limited to the service using markup-language, platform and Contents. Therefore, research on integration Contents of different. Wireless internet platform and its development are necessary. For the easiness of maintenance and compensation, this paper attempts to design a Wireless internee Contents converter for integrate wired and wireless platform which automatically converts to WML and HDML, M-HTML, S-HTML, C-HTML through analysis of HTML document.

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Power Transmission Mechanism and Data Communication of the Dosimeter using Contactless Powerless Transmission (선량계의 무선전력 전송 메카니즘과 데이터 통신 시스템 구현)

  • Lee, Seung-Min;Chung, Sung-In;Lee, Heung-Ho
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.59 no.4
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    • pp.814-819
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    • 2010
  • This study proposes the antenna circuit design for the transmitting wireless power, the development of the RF non-contact type Dosimeter. That is, the study designed the optimization and numerical analysis of the antenna circuit for the antenna design of 13.56MHz over the frequency bands for transmitting wireless power. We studied the needed items in the existing RF type Dosimeter with battery to implement the wireless power non-contact Dosimeter within the battery. We compared to the real measurement value as calculating the value of the inductance and capacitance through the numerical analysis for the antenna LC resonance using the theory of the electromagnetic induction method. This method to drive low power is designed to simplify the circuit and to improve the efficiency of the rectifier. We convince our research contributes not only to understand the simplified circuit and miniaturization, but also to help the design and application technology of the wireless power transmit system which is received power supply with wireless.