• Title, Summary, Keyword: PCS 단말기

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System Analysis for Receiving Performance Improvement of Mobile Station in PCS (개인휴대통신에서 이동국의 수신성능개선을 위한 시스템 분석)

  • Ju, Jae-Han;Park, Se-Seung;Park, Jong-An;Cheon, Jong-Hun
    • The Transactions of the Korea Information Processing Society
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    • v.6 no.1
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    • pp.159-166
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    • 1999
  • In this paper, we examined noise figure and the 3rd order intercept point in sensitivity single tone desensitization, and response attenuation by intermodulation spurious of receiver and also analyzed them through simulation based on J-STD-0.18, which is the minimum specification of PCS mobile station. The result of simulation was as follows ; In sensitivity specification, the total noise figure was 5.99dB and the 3rd order intercept point was -33.979dB. Ins ingle tone desensitization and intermodulation spurious response attenuation specification, the total noise figure was 6.375dB and the 3rd order intercept point was -26.99dBm. When there is an interference tone, the nosie figure and the 3rd order intercept point have been increasedly 0.367dB respectively, compared wit that of no interference tone. Because the amount of increase in the 3rd order intercept point was highly raised more than that of noise figure, mixer, closely related to interference tone should be specified in high 3rd order intercept point. At a frequency spacing of 1.25MHz and 2.05MHz from center frequency in IF SAW filter, attenuation should be more than 45dB.

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A Design of Dual-band Stacked Helix Monopole Antenna with Parasitic Patch (기생 패치를 이용한 이중 대역 적층형 헬릭스 모노폴 안테나 설계)

  • Jung, Jin-Woo;Kim, Kyoung-Keun;Lee, Hyeon-Jin;Lim, Yeong-Seog
    • Journal of the Institute of Electronics Engineers of Korea TC
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    • v.44 no.1
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    • pp.155-161
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    • 2007
  • This paper presents the design simulation, implementation, and measurement of a miniaturized PCS / Satellite DMB dual-band stacked mompole antenna with a parasitic patch for mobile communication terminals. A stacked helix is realized by using a via hole with height of 0.4 mm and a diameter of 0.35 mm to connect upper- and lower-layer helix sections for a reduction of the dimensions of the antenna. In addition the stacked helix chip antenna is interleaved with a parasitic patch to achieve two different radiation modes. The ratio of the first frequency and the second frequency vary with the geometrical parameter of the parasitic patch. The fabricated antenna uses FR-4 substrate with a relative permittivity of 4.2. Its dimensions are $15.5{\times}7.6{\times}0.4 mm^3$. The measured impedance bandwidths (VSWR<2) are 240 and 250 MHz at the operating frequencies, respectively.

Design of HSE Management System in a Shipyard using object-oriented Component-Based Development Method (ooCBD방법론을 적용한 조선소의 HSE관리시스템 설계)

  • Oh, Hyun-Soo;Chang, Seong-Rok;Kim, Dong-Joon
    • Journal of the Korean Society of Marine Environment & Safety
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    • v.19 no.1
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    • pp.71-77
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    • 2013
  • Smart work has been gaining more popularity recently. Smart work means that employees perform their works anytime and anywhere as utilizing the information and communication technology. It can be divided into four categories; the mobile office, the home office, the work-at-center and the tele-cooperation. Among them, the mobile office based on tablet personal computers(PCs) or smart phones, employees can exchange information with tablet PCs or smart phones via mobile radio communication networks and portable terminals. Smart devices such as tablet PCs and smart phones help to access intranet system for requests, approvals, information search whenever employees need. This mobile office system for real-time HSE managing can contribute to improve the productivity and work efficiency in a shipyard. In this study, the main goal is to design the specialized mobile application for the HSE management system on the shipbuilding industry. The mobile application including 10 functions is designed based on ooCBD(object-oriented Component Based Development) methodology.

A Study on the Small Isolator Characteristics and Design of Mobile Phones (이동통신 단말기용 소형 아이솔레이터 특성 및 설계에 관한 연구)

  • 이영훈;권원현
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.12 no.2
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    • pp.165-175
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    • 2001
  • In this paper, it is analyzed lumped element isolators analytically by the analysis program using scattering matrixes including ferrite saturation magnetization, external direct current magnetic field and strip line length and width, designed and experimented the small isolator of mobile phone. The simulation results show that the characteristics of the isolator are affected by external R, C, length and width of strip line and ferrite width and saturation magnetization sensitivity. We proposed the isolator specification applied cellular and PCS mobile phones, experimented the isolator for cellular mobile phones. From the experimented result, isolation and return loss are measured below 20 dB, insertion loss is below 0.7 dB, bandwidth is about 44 MHz at center frequency 836.5 KHz. The implemented isolator has better performances than the conventional one.

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Design of PIFA on PCS Handset for SAR Reduction (SAR 저감을 위한 PCS 단말기의 PIFA 설계)

  • Kim, Hyong-Kyoung;Park, Ju-Derk;Kim, Nam;Yun, Jae-Hun
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.11 no.1
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    • pp.46-54
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    • 2000
  • In this paper, PIFA on PCS handset for SAR reduction is designed. According to the position of PIFA attached on the handset, side mounted PIFA and top mounted PIFA are suggested. Resonance characteristics with variety of design parameters are analyzed. And monopole antenna with $\lambda$/4 length is designed and compared with PIFAs in bandwidth and SAR. At 1.83 GHz center frequency, the bandwidth of side mounted PIFA and monopole antenna are 8.2% and 21.7%, respectively. The 1 g and 10 g peak average SARs of side mounted PIFA are 0.686 and 0.353 respectively, which are about 1/3 of SARs of monopole antenna, 1.759 and 0.978, respectively.

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Design of Dual-band Stacked Meander Line Antenna with Double Coupled Line (이중 커플드 라인을 이용한 이중 대역 적층형 미앤더 라인 안테나)

  • Jung, Jin-Woo;Seo, In-Jong;Lee, Hyeon-Jin;Lim, Yeong-Seog
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.17 no.10
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    • pp.993-999
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    • 2006
  • This paper presents the design simulation, implementation, and measurement of a miniaturized DCS, PCS / Satellite DMB dual-band stacked chip antenna with double coupled line for mobile communication terminals. A stacked meander is realized by using a via hole with height of 0.8 mm and a diameter of 0.35 mm to connect upper- and lower-layer meander sections for a reduction of the dimensions of the antenna. In addition the stacked meander chip antenna is extended by a double coupled-line to achieve two different radiation modes. A ratio of the first frequency and second frequency vary with the geometrical parameter of coupled lines. The fabricated antenna used FR-4 substrate with relative permittivity of 4.2. And its dimensions are $15.2{\times}7{\times}0.8mm^3$. The measured impedance bandwidth(VSRW<2) are 244 and 120 MHz at the operating frequency, respectively.

Development of the Triple Band(DCS, PCS, UPCS) Internal Chip Antenna using QMSA Structure (QMSA 구조를 활용한 내장형 트리플 칩 안테나 개발)

  • Park, Sung-Il
    • The Journal of the Korea institute of electronic communication sciences
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    • v.8 no.10
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    • pp.1427-1434
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    • 2013
  • In this paper, triple band mobile chip antenna for DCS(1.71~1.88GHz) / PCS(1.75~1.87GHz) / UPCS(1.85~1.99GHz) on PCB Layout is designed. To analyze the characteristics of the designed antenna, we designed and measured Single, Dual, Triple Band antenna. The designed antenna was fabricated and measured using vector network analyzer in LTK(Laird Technologies Korea). Triple and wide band characteristic could be realized the measured bandwidth(V.S.W.R<2.0) of designed antenna operated in the band of 1.71GHz~1.99GHz. This antenna has a small size of about $19mm{\times}4mm{\times}1.6mm$, narrow bandwidth which is a defect of chip antenna is improved. And its experimental results were a good agreement with simulation performance.

Design and Implementation of a Mobile Runtime Library for Execution of Large-scale Application (대용량 소프트웨어 실행을 위한 모바일 런타임 라이브러리 설계 및 구현)

  • Lee, Ye-In;Lee, Jong-Woo
    • Journal of Korea Multimedia Society
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    • v.13 no.1
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    • pp.1-9
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    • 2010
  • Today's growth of the mobile communication infrastructure made mobile computing systems like cellular phones came next to or surpassed the desktop PCs in popularity due to their mobility. Although the performance of mobile devices is now being improved continuously, it is a current common sense that compute intensive large-scale applications can hardly run on any kind of mobile handset devices. To clear up this problem, we decided to exploit the mobile cluster computing system and surveyed the existing ones first. We found out, however, that most of them are not the actual implementations but a mobile cluster infrastructure proposal or idea suggestions for reliable mobile clustering. To make cell phones participated in cluster computing nodes, in this paper, we propose a redesigned JPVM cluster computing engine and a set of WIPI mobile runtime functions interfacing with it. And we also show the performance evaluation results of real parallel applications running on our Mobile-JPVM cluster computing systems. We find out by the performance evaluation that large-scale applications can sufficiently run on mobile devices such as cellular phones when using our mobile cluster computing engine.

Implementation of Communication Module in CDMA wireless network with End-to-End TCP connection (CDMA 망에서의 종단간 TCP 연결을 위한 통신 모듈 구현)

  • 최윤대;이호준;박용진;김원태
    • Proceedings of the Korean Information Science Society Conference
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    • pp.589-591
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    • 2001
  • 90년대 이후 계속해서 이동통신 기술은 발전에 발전을 거듭해왔다 1세대 아날로그 이동통신에서 2세대 디지털 이동통신 그리고 2.5세대라고 하는 PCS(Personal Communication Service)에 이어 3세대 이동통신의 혁명이라는 IMT2000 서비스가 눈앞으로 다가왔다. 1,2 세대 이동통신이 음성통학 위주의 서비스를 제공하였다면, 2.5세대에서는 소비자의 욕구가 음성통화를 벗어나 데이터서비스를 요구함에 따라 점차적으로 데이터 서비스에 대한 비중이 증가하게 되었다. 3세대 이동통신에서는 보다 빠르고, 보다 많은 데이터를 전송하기 위한 방안이 고려되었다. 본 논문에서는 2.5세대 이동통신에서 제공되는 데이터 서비스를 이용하여 GPS 모듈과 연동하여 물류단말기에 응용할 수 있는 소프트웨어 모듈을 구현하였다.

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The Design of presentation Tier Framework of the Network Management System Based on J2EE (J2EE 기반망 관리 시스템의 프리젠테이션 계층 프레임워크의 설계)

  • 이종언;차시호;조국현
    • Proceedings of the Korean Information Science Society Conference
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    • pp.460-462
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    • 2002
  • 본 논문에서는 기존의 망 관리 시스템의 관리가 시간, 장소, 벤더에 종속되고 개발시에 시스템 전반을 설계 구현해야 한다는 단점을 보안하기 위하여 J2EE (Jaya 2 Enterprise Edition) 기술을 사용하는 컴포넌트 기반의 다중 계층 구조를 갖는 망 관리 시스템을 제안하며, J2EE 기반 망 관리 시스템의 프리젠테이션 프레임워크를 설계한다. 본 망 관리 시스템의 프리젠테이션 프레임워크는 웹 브라우저, WAP (Wireless Application Protocol) 단말기, PCS (Personal Communication System) 등의 모든 다양한 Internet 장비들을 망 관리 인터페이스로 제공하기 위하여 자바 빈즈, 서블릿, JSP (Java ServerPage), XML (eXtensible Markup Language), J2ME (Java 2 Micro Edition) 기술 등을 사용하여 설계한다.

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