• Title, Summary, Keyword: Wireless PAN

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Binary CDMA for Home Network (Binary CDMA를 이용한 홈 네트워크)

  • Kang Sung-Jin;Hong Dae-Ki;Ju Min-Chul;Kim Young-Sung;Cho Jin-Woong
    • Journal of The Institute of Information and Telecommunication Facilities Engineering
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    • v.3 no.1
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    • pp.56-74
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    • 2004
  • 본 논문에서는 기존의 여러 가지 무선 홈 네트워크에 대해 개괄하고 새로운 표준인 Binary CDMA (Code Division Multiple Access)를 이용한 Koinonia 시스템을 제안한다. 제안된 시스템은 멀티 코드 CDMA 시스템을 고속의 멀티미디어 전송을 위해 변형한 형태이다. 멀티코드 사용 시 송신 신호 파형이 멀티 레벨로 나타나게 되어 시스템의 구조가 복잡해지고 가격이 비싸지는 단점이 존재한다. 이러한 기술적 문제점을 해결하기 위해 멀티레벨의 신호를 부호화 블록을 통해 정진폭으로 변환해 전송한다. 이를 통해서 복잡한 멀티 레벨의 신호가 간단히 나타나므로 전송되는 신호의 파형이 간단히 표현되어지고 수신기의 구조가 간단해진다. 그리고, 제안된 시스템은 멀티 코드 방식을 기반으로 하기 때문에 디지털 가전기기나 3세대 이동통신과, WPAN과 관련된 무선 네트워크 응용과 같은 미래의 고속의 무선 멀티미디어 서비스를 지원하기에 적합하다.

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IP router-based W-PAN (Wireless Personal Area Network) Authentication Control Technology (IP 공유기 기반 W-PAN(Wireless Personal Area Network) 인증 제어기술 개발)

  • Choi, Jung-In;Lee, Sun-Sook;Lee, Ha-Kyung;Lee, Jun-Hyeong;Jeong, Jung-Su;Young, Hwan-Seung
    • Proceedings of the Korean Society of Computer Information Conference
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    • pp.311-313
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    • 2013
  • 본 논문에서는 W-PAN 환경에서 IP공유기를 표준설계하고 구현하며 효율적인 실시간 사용자 웹기반 인증 기법을 연구하였다. 또한 W-PAN Device & Service Application 인증과 접근, 권한제어를 위한 인증 Client 모듈과 Server 모듈, Supplicant를 개발하고 제안하였다. 이를 통해 IP 공유기 기반 환경에서의 W-PAN 환경에서 인증 제어 솔루션에 대한 개발로 생산되는 단말기의 서비스 품질을 향상시키고 무선 접속 기술을 표준화 할 수 있다. 또한 유해한 트래픽을 검색하고 보호하는 안정적인 시스템 관리가 가능해졌다. W-PAN Device와 Service Application 인증, 접근 및 권한 제어를 위한 인증 시스템의 플랫폼 구축으로 향후 관련 기술의 통합과 융합 기술을 적용할 수 있는 능력을 확보하였다.

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Experimental Interference Studies Between WCDMA and UWB System

  • Kim, Myung-Jong;Kim, Jae-Young;Kang, Young-Jin;Hong, Ic-Pyo
    • Proceedings of the Korea Society of Information Technology Applications Conference
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    • pp.187-190
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    • 2005
  • Ultra wideband (UWB) technologies have been developed to exploit a new spectrum resource in substances and to realize ultra-high-speed communication, high precision geolocation, and other applications. The energy of UWB signal is extremely spread from near DC to a few GHz. This means that the interference between conventional narrowband systems and UWB systems is inevitable. However, the interference effects had not previously been studied from UWB wireless systems to conventional mobile wireless systems sharing the frequency bands such as WCDMA system. This paper experimentally evaluates the interference from two kinds of UWB sources, namely a direct-sequence spread-spectrum UWB source and an impulse radio UWB source, to a WCDMA digital transmission system. The average frame error rate degradations are presented. From these experimental results, we show that in all practical cases UWB system can coexist with WCDMA terminal without causing any dangerous interference.

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PROPOSAL OF TRACKING LAN ANTENNA USING IMAGE SENSOR

  • Uranishi, Yuki;Ikeda, Sei;Shimada, Hideki;Manabe, Yoshitsugu;Chihara, Kunihiro
    • Proceedings of the Korean Society of Broadcast Engineers Conference
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    • pp.742-745
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    • 2009
  • This paper proposes a wireless LAN antenna system that tracks an object automatically by using image-based tracking. The proposed system consists of a camera and a pan-tilt unit in addition to a directional wireless LAN antenna. The camera and the directional antenna are set in same direction and they are set on the pan-tilt unit. A target object which has a wireless LAN receiver is tracked by using images captured by the camera. And the directional antenna faces in same direction as the camera by the pan-tilt unit. Therefore, the directional antenna keeps pointing the receiver, and a transmitting efficiency is improved. A result of a fundamental experiment shows that a receiver attached to a flying airship was tracked by a prototype of the proposed antenna system. The airship flied about, and the proposed antenna system was set on a roof of a building. The experimental result indicates an effectiveness of the proposed system compared to the conventional directional LAN antenna.

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Development Trend of Standards for Low-Rate, Low-Cost, and Low-Power Wireless PAN (저속, 저가, 저전력 무선 PAN 표준 개발동향)

  • Kim, J.T.;Lee, H.;Hwang, D.H.;Kim, B.T.
    • Electronics and Telecommunications Trends
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    • v.18 no.2
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    • pp.37-44
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    • 2003
  • 무선통신의 효용성이 증가되면서 다양한 분야에서 유선과 무선을 통합한 형태의 연결망이 구축되고 있으며, 이에 따라 저속, 저가, 저전력의 무선통신 분야의 기술 규격에 대한 요구사항이 제기되고 있다. 본 고에서는 무선으로 저속의 데이터 전송률을 요구하는 다양한 응용분야에 널리 활용될 수 있는 IEEE 802.15.4 저속 무선 PAN의 표준안과 응용서비스에 대해 살펴본다. 저속 무선 PAN 표준안의 주요 특징은 네트워크 구성의 유연성, 저가, 저전력 소모에 있다.

A Design of Current-Mode Analog FIR Filter for Wireless Home Network (주파수가변형 무선PAN단말을 위한 전류모드 아날로그 FIR 필터의 설계)

  • Kim, Seong-Kweon;Kim, Kwang-Ho;Cho, Ju-Phil;Cha, Jae-Sang
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.20 no.10
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    • pp.35-40
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    • 2006
  • In this paper, a current-mode analog variable finite-impulse-response (FIR) filter with variable tap coefficient circuits is proposed for frequency selective wireless personal area network(WPAN) system or terminals. From the circuit simulation the operation of the 7-tap FIR filter is confirmed. The 0.0625-step tap coefficient circuit is designed and fabricated with $0.8[{\mu}m]$ CMOS technology. The proposed FIR filter has a variable length of taps and variable coefficients, so it has a potential for being used to frequency selective WPAN system or frequency selective wireless communication terminals.

The Low Power Algorithm of ZigBee Router for Non Beacon Enabled PAN (Non Beacon Enabled PAN 환경에서 ZigBee Router의 저전력 알고리즘)

  • Yoon, Sung-Kun;Park, Su-Jin;Lee, Ho-Eung;Park, Hyun-Ju
    • 한국HCI학회:학술대회논문집
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    • pp.280-285
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    • 2008
  • ZigBee is Low Power and Low Data Rate Wireless Communication protocol. It apply to much Ubiquitous Sensor Network. ZigBee PAN is two type PAN. One is Beacon Enabled PAN, the other is Non Beacon Enabled PAN. To support Low Power in Non Beacon Enabled PAN, End-Device enter Active status at End-Device's wishing time and send a data. So, Router does not know End-Device sends a data time. To solving this problem, Router must always exist to Active status. In this case, Router receive a power supply always in Non Beacon Enabled PAN. But Router does not receive a power supply always, Router can not normal operation, such as Router use a battery. To solve this problem, Router will be support low power. In this paper, we will present Router's Low Power Algorithm. And we suggest 'PAN Time'. Device use 'PAN Time' for PAN synchronous. Router using Low Power Algorithm can be enter to inactive status. So Non Beacon Enabled PAN of Router support the low power mode Therefore Router does not receive a power supply always, Router can normal operation.

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