• Title/Summary/Keyword: mobile broadband

Search Result 311, Processing Time 0.028 seconds

Numerical Analyses of Several tens of GHz Wave Signal Generation for Broadband Communication System (광대역 통신시스템을 위한 수십 GHz 신호생성을 위한 수치 해석)

  • Kim Jung-Tae
    • Journal of the Korea Institute of Information and Communication Engineering
    • /
    • v.8 no.7
    • /
    • pp.1581-1587
    • /
    • 2004
  • In this paper, We have proposed an Heterodyne technique to generate millimeter-wave signal. Microwave signals in cellular broadband mobile communication networks and distributed networks can favorably be generated and distributed by optical techniques. In principle, these techniques have already been investigated for optical control of phase-array antennas, characterization of photo-detector and phase locking of millimeter-wave oscillators and now being applied to wireless communications. The generation and transmission of millimeter-wave radio signals by optical means is of interest for future pico-cell broadband mobile communication system, especially for systems operating at frequencies of 300Hz.

Experimental Analyses and Millimeter Wave Signal Generation Using Sideband Injection Locking Method (측파대 광 주입 락킹 기법을 이용한 밀리미터파 신호생성 및 실험적 분석)

  • Kim, Jung-Tae
    • Journal of the Korea Institute of Information and Communication Engineering
    • /
    • v.14 no.12
    • /
    • pp.2769-2774
    • /
    • 2010
  • In this paper, we have proposed sideband injection locking method, heterodyne technique, to generate millimeter-wave signal. Microwave signals in cellular broadband mobile communication networks and distributed networks can favorably be generated and distributed by optical techniques. In principle, these techniques have already been investigated for optical control of phase-array antennas, characterization of photo-detector and phase locking of millimeter-wave oscillators and now being applied to wireless communications. The generation and transmission of millimeter-wave radio signals by optical means is of interest for future pico-cell broadband mobile communication system, especially for systems operating at frequencies of tens of GHz applicable to LMDS. We experimented and analysed the generation of millimeter wave signal.

Quality Measurement of Mobile Telecommunication based on Android (안드로이드 기반을 이용한 이동통신 품질측정)

  • Kim, Jang-Won
    • The Journal of the Institute of Internet, Broadcasting and Communication
    • /
    • v.16 no.6
    • /
    • pp.9-14
    • /
    • 2016
  • The Korea Communication Commission(KCC) measures communication qualities of mobile phones' voice calls, mobile internet, and broadband internet to provide quality communication services. It particularly focuses on measuring qualities of mobile internet data that is on the rise in terms of usage. However, existing quality measurement simply measures the speed of mobile communication through data without providing much information to users and does not disclose measured data, making it hard for individuals to objectively determine their communication quality. Thus, to improve such problems, the author suggests a system that measures qualities of mobile communication through Android. The method guarantees user convenience and reliability and improved mobile communication by making it easy for users to select the quantity of data to be used. It also saves the current GPS obtained through GPS module or mobile communication network and transfers measured data to servers so that the data can be processed into new information and be reinterpreted.

Empirical Study on Smoothing of VBR Stream for Broadband Wireless Network (광대역 무선 환경에서 VBR 트래픽 스무딩에 대한 연구)

  • 심보욱;원유집;송승호
    • Proceedings of the Korean Information Science Society Conference
    • /
    • 2002.04a
    • /
    • pp.130-132
    • /
    • 2002
  • In this work, we like to present the result of study obtained from actual experiment. We instrument the effect of smoothing on packet loss behavior in mobile terminal on broadband wireless network under various different system settings. This activity requires comprehensive streaming software suite including streaming server, CODEC, and streaming client.

  • PDF

A Study of Broadband Propagation Characteristics for The Future Mobile Communications(I) - Broadband Propagation Characteristics Measurements on Indoor (차세대 이동통신에서의 광대역 전파특성 연구(I)-실내에서의 광대역 전파특성 측정-)

  • 하덕호
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
    • /
    • v.9 no.2
    • /
    • pp.265-277
    • /
    • 1998
  • In this paper, to investigate the possibility of fading reduction effect and high transmission rate in indoor multipath propagation environment, we measured and analyzed broadband signal conducting by frequency sweeping method in LOS(Line-of-Sight) environment. In measuring, we used vertically polarized, horizonatally polarized and circularly polarized and circularly polarized antenna to compare the fading reduction effect and the characteristic of bandwidth amplitude fluctuation between each broadband signals. As a result, it can be seen that the circularly polarized antenna can reduce the amplitude deviation of the broadband signal because it can remove the odd-times reflected wave in LOS environment. And also, It was found that the best effective diversity reception method is to use polarization branches, which install a circularly polarized antenna at the transmitting end and compose the vertical and horizontal antenna at the receiving end.

  • PDF

A Low-Profile Broadband Array Antenna for Home Repeater Applications

  • Yoon, Sung Joon;Choi, Jaehoon
    • Journal of electromagnetic engineering and science
    • /
    • v.18 no.4
    • /
    • pp.261-266
    • /
    • 2018
  • This paper reports on the proposed design of a low profile broadband array antenna for home repeater applications. The proposed antenna consists of $1{\times}4$ patch elements and two ground planes, one of which is slitted. By using the gap feeding method, the impedance matching of the antenna is improved by a multi-resonance phenomenon. The proposed antenna provides a wide -10 dB reflection coefficient bandwidth simultaneously covering the Global System for Mobile communications (GSM-1800), Personal Communications Service (PCS), and the Universal Mobile Telecommunication System (UMTS) bands (1.67-2.32 GHz). In order to reduce the mutual coupling between adjacent patch elements, slits are embedded in the ground plane. An isolation level of -20 dB is realized over the entire operating frequency band.

Millimeter-wave signal Generation using Heterodyne Technique (헤테로다인 기법을 이용한 밀리미터파 신호 생성)

  • 김정태
    • Journal of the Korea Institute of Information and Communication Engineering
    • /
    • v.7 no.6
    • /
    • pp.1334-1340
    • /
    • 2003
  • In this paper, We have proposed an Heterodyne technique to generate millimeter-wave signal. Microwave signals in cellular broadband mobile communication networks and distributed networks can favorably be generated and distributed by optical techniques. In principle, these techniques have already been investigated for optical control of phase- array antennas, characterization of photo-detector and phase locking of millimeter-wave oscillators and now being applied to wireless communications. The generation and transmission of millimeter-wave radio signals by optical means is of interest for future pico-cell broadband mobile communication system, especially for systems operating at frequencies of 300Hz.

Study on Usage-behavior of Fixed and Wireless Internet and Needs of Mobile Broadband (유무선 인터넷 이용행태와 모바일 브로드밴드(Mobile Broadband) 니즈 분석)

  • Park, Jong-Hyun;Kim, Moon-Koo;Lee, Sun-Mi;Park, Hee-Jin
    • Proceedings of the Korean Information Science Society Conference
    • /
    • 2006.10d
    • /
    • pp.549-552
    • /
    • 2006
  • 국내 유무선 인터넷은 세계 시장과 통신트랜드를 주도할 정도로 이용자 규모, 서비스 다양성, 서비스 수용성 측면에서 커다란 성과를 나타내며 이는 선순환 구조를 통해 단말기, 장비, 콘텐츠 산업의 경쟁력을 강화시키는데 기여하고 있다. 또한 국내 통신시장은 와이브로와 HSDPA로 대표되는 광대역 무선인터넷 시대를 선도할 것으로 기대되고 있다. 본 글에서는 전국 일반인을 대상으로 시장조사 결과를 바탕으로 유무선 인터넷의 이용행태를 파악하고 광대역 무선인터넷에 대한 니즈를 탐색하고자 하였다. 분석결과, 국내 유무선 인터넷 시장은 10~20대의 학생층뿐만 아니라 30대 이상의 화이트 칼라로 이용층으로 확대되며 이 계층이 광대역 무선인터넷의 핵심 이용자군으로 잠재력을 지닌 것으로 나타났다.

  • PDF

Improving IPTV Forwarding Masechanism in IEEE 802.16j MMR Networks Based on Aggregation

  • Brahmia, Mohamed-El-Amine;Abouaissa, Abdelhafid;Lorenz, Pascal
    • ETRI Journal
    • /
    • v.35 no.2
    • /
    • pp.234-244
    • /
    • 2013
  • Internet protocol television (IPTV) service depends on the network quality of service (QoS) and bandwidth of the broadband service provider. IEEE 802.16j mobile multihop relay Worldwide Interoperability for Microwave Access networks have the opportunity to offer high bandwidth capacity by introducing relay stations. However, to actually satisfy QoS requirements for offering IPTV services (HDTV, SDTV, Web TV, and mobile TV) for heterogeneous users' requests, providers must use a video server for each IPTV service type, which increases the network load, especially bandwidth consumption and forwarding time. In this paper, we present a solution for forwarding IPTV video streaming to diverse subscribers via an 802.16j broadband wireless access network. In particular, we propose a new multicast tree construction and aggregation mechanism based on the unique property of prime numbers. Performance evaluation results show that the proposed scheme reduces both bandwidth consumption and forwarding time.

Study on Mobile Broadband Coherent Anti-Stokes Raman Spectrometer For Combustion Diagnostics (연소진단용 이동형 광대역 코헤런트 반 스톡스 라만 분광기에 관한 연구)

  • Park, Chul-Woung;Park, Seung-Nam;Hahn, Jae-Won;Lee, Jong-Ung
    • Journal of the Korean Society of Combustion
    • /
    • v.1 no.2
    • /
    • pp.9-20
    • /
    • 1996
  • We construct a mobile broadband coherent anti-Stokes Raman spectroscopy system to measure the temperature of combustion gases. To improve the accuracy of CARS temperatures due to Stokes lasers, a modeless dye laser is constructed. A monochromator to disperse CARS spectra is also constructed in the spectrometer for easy portability. The accuracy of CARS temperature, measured in graphite tube furnace in reference to a radiation pyrometer, is better than 2 % from 1000 K to 2400 K. The CARS temperature error due to the variation of the spectral distribution of the modeless laser is measured to be less than 1.5 % during five hours operation. As a demonstration of combustion diagnosis, we applied the spectrometer to measure the temperature distribution of the propane air premixed flame.

  • PDF