• Title/Summary/Keyword: UWB system

Search Result 522, Processing Time 0.029 seconds

Feasibility Study for the Development of a Device for Detecting Pathological Tissues (병리학적 조직 진단장치 개발에 대한 타당성 분석 연구)

  • Ko, Chea-Ok;Park, Min-Young;Pack, Jeong-Ki
    • Proceedings of the Korea Electromagnetic Engineering Society Conference
    • /
    • 2005.11a
    • /
    • pp.421-424
    • /
    • 2005
  • X-ray is currently most effective method in detecting small malignant breast tumors but has the several problems due to suppressing breast, ionizing radiation and not detecting small cancer. In this paper, a new method is proposed by using dielectric characteristics of pathological tissues and time delay of backscattered response. We have developed a detection algorithm and verified it by numerical simulation and measurement for a prototype system. For a prototype system, we have fabricated experimental model(artificial breast with a cancer) and UWB(ultra-wideband) antenna. The results of the measurement simulation show an excellent detection capability of a cancer tissue. It is found that a good UWB antenna is a key element of such detection system. Further study is ongoing to develop a commercial system.

  • PDF

Performance Analysis of UWB M-ary PPM System (UWB M진 PPM 시스템의 성능 분석)

  • 김동호;강희조;문용규
    • Proceedings of the Korea Multimedia Society Conference
    • /
    • 2002.11b
    • /
    • pp.601-604
    • /
    • 2002
  • 본 논문에서는 UWB(초광대역 : Ultra-Wideband) 시스템에서 FCC 위원회에서 제안한 규정을 근거로 산출된 파라미터를 이용하여 M-ary PPM 시스템에서 고려되는 파라미터 값의 관계를 분석한 후 최적의 파라미터 값을 산출하였다. AWGN 채널에서 다중 접속을 고려하지 않은 단일 사용자일 경우로 가정시, 펄스 반복 개수 N/sub s/가 변화함에 따른 BER 특성과 M=4, 8인 경우 채널부호화 기법을 채용시 성능 개선으로 부호율 R(1/2, 1/3)과 구속장 K(7, 9)에 따른 Convolution 부호화를 고려하였을 경우 BER 특성을 분석하였다.

  • PDF

Low-power memory based FFT structure for high speed UWB (UWB용 저전력 Memory based FFT 구조)

  • Choi, Dong-Kyu;Jang, Young-Beom
    • Proceedings of the IEEK Conference
    • /
    • 2008.06a
    • /
    • pp.215-216
    • /
    • 2008
  • Ultra wideband (UWB) system is one of the promising solutions for future short-range communication which has recently received a great attention by many researchers. In this paper, we proposed 128-point low power FFT structure based on the memory for UWB systems. The proposed structure can improve implementation area and power consumption efficiency as it consists of one of the butterfly PE and a little memory.

  • PDF

Indoor Obstacles Environments Channel Modeling of UWB Systems (실내 환경에서 장애물에 의한 UWB 채널모델링)

  • Kim, Woon-Gab;Lee, Suk-Hui;Lee, Sang-Ho;Bang, Sung-Il
    • Proceedings of the IEEK Conference
    • /
    • 2006.06a
    • /
    • pp.39-40
    • /
    • 2006
  • This paper modeled UWB system transmission channel in indoor environment. For channel modeling, we extracted transmission channel parameter, and then measured from 10MHz to 16.01GHz by using method of CIR(Channel Impulse Response) and CTF(Channel Transfer Function) in small room($5.5{\times}5.5m^2$) environment.

  • PDF

Performance improvement of LDPC decoding for a next generation UWB system (차세대 UWB 시스템을 위한 LDPC 복호 성능 향상 연구)

  • Jeong, Deuk-Young;Kim, Dong-Ho;Jeon, Tae-Hyeon
    • Proceedings of the Korean Society of Broadcast Engineers Conference
    • /
    • 2010.07a
    • /
    • pp.287-290
    • /
    • 2010
  • 최근 기기간의 접속에 적합한 근거리 무선 접속기술의 요구가 증대됨에 따라, 그 요구에 대응하는 무선통신기술의 하나로 UWB(Ultra Wide Band)가 주목을 받고 있다. 특히, TV와 캠코더, 카메라 등의 AV기기 상호 간의 무선접속을 포함하여 PC나 휴대정보단말(PDA) 등이 네트워크에 무선으로 접속하는데 UWB 기술은 주요한 역할을 담당할 것으로 예상된다. 최근 서비스가 진행되고 있는 HDTV를 비롯하여 향후 UHDTV(Ultra-HDTV) 등의 방송시스템이 본격화되면 HD급 이상의 캠코더는 고해상도에 따른 대용량 데이터를 저장하고 AV기기 간의 데이터 전송을 위해 고속 무선 데이터 전송이 필수적이다. 또한 이와 같은 고속 무선데이터 전송을 위해서는 보다 안정된 송수신 기술이 절대적으로 필요하다. 이를 위하여 본 논문에서는 차세대 UWB의 설계 제약조건 중 하나인 저전력 송신환경에서 수신 신뢰도의 향상을 이루기 위해 LDPC code를 오류정정부호로 고려하고, 제한된 반복복호 횟수를 가지고 개선된 성능을 얻기 위해 새로운 복호 알고리즘을 제안하였다. 또한, 제안한 복호 알고리즘에 대해 모의실험을 통하여 성능을 검증함으로써 차세대 UWB 송수신 기술로서의 유용성과 적용 가능성을 제시하였다.

  • PDF

Design of a Polygon Slot Antenna with a Polygon Tuning Stub for Ultra-Wideband Applications

  • Lee, Ju Ho;Choi, Young Gyu;Yoon, Joong Han
    • Journal of information and communication convergence engineering
    • /
    • v.15 no.1
    • /
    • pp.1-6
    • /
    • 2017
  • In this study, we develop and experimentally evaluate an ultra-wideband (UWB) slot antenna with a polygon tuning stub. The proposed antenna consists of a polygon slot with a $50-{\Omega}$ feed line. The effects of various parameters of the polygon-shaped slot and the polygon tuning stub on UWB applications are investigated. The optimum parameters were obtained using the Ansys HFSS software. The results of the studies on the surface current distributions of the operating frequency bands were discussed. The proposed antenna is fabricated on an inexpensive FR-4 substrate with the overall dimensions of $28.0mm{\times}30.0mm$. The measured results confirm that the proposed antenna covers frequencies from 2.58 GHz to 13.27 GHz, which is the UWB frequency range. Further, the proposed UWB antenna also exhibited that omni-directionality in the H-plane gain varied from 1.185 to 7.246 dBi. The good antenna characteristics of the proposed antenna make it suitable for UWB system applications.

Collision Avoidance Method for Coexistence between Relay-Based Multi-Hop UWB System (UWB기반 다중 홉 선박 네트워크간의 공존을 위한 충돌 회피 기술)

  • Kim, Jin-Woo;Park, Jong-Hwan;Lee, Seong Ro
    • The Journal of Korean Institute of Communications and Information Sciences
    • /
    • v.39C no.8
    • /
    • pp.688-695
    • /
    • 2014
  • In a small wireless environment, such as your home or office, a various network using WiMedia PHY can be mixed. Because these networks operate independently for each application, data conflict can occur between adjacent networks. To avoid data conflict, the resource in a different time zone can be utilized. However, if devices in a network increase, available resources in the network decrease, and then the lack of resources necessary to provide service can occur. To solve this problem, we propose collision avoidacne scheme for coexistence of various UWB systems. In this paper, we evaluate the performance of the proposed scheme through simulation.

The Implementation of UWB Bandpass Filter using SIR(Stepped Impedance Resonators) Structure (SIR 구조를 이용한 초광대역 대역 통과 여파기의 설계)

  • Shin, Seung-Ha;Choi, Chang-Ho;Jun, Kye-Suk
    • The Journal of Korean Institute of Communications and Information Sciences
    • /
    • v.35 no.12A
    • /
    • pp.1214-1218
    • /
    • 2010
  • A new compact UWB bandpass filter with sharp-rejection and low insertion-loss is designed in this paper, using the parallel transmission line with SIR structure. An Example filter is firstly theoretically designed by the proposed synthesis procedure, the optimized by EM simulator, fabricated in microstrip line and finally characterized by a network analyzer. A good agreement between the simulation results and prototype validates the proposed UWB bandpass filter. The designed filter also realized a sharp rejection of higher order with a relatively small size which is proper for the UWB communication system.

Improvement of Computational Speed for the SVD Background Clutter Signal Subtraction Algorithm in IR-UWB Radar Systems (IR-UWB Radar 시스템에서 특이값 분해를 이용한 클러터 신호 제거 알고리즘의 연산속도 향상 기법)

  • Baek, In Seok;Jung, Moon Kwun;Cho, Sung Ho
    • The Journal of Korean Institute of Communications and Information Sciences
    • /
    • v.38C no.1
    • /
    • pp.89-96
    • /
    • 2013
  • This paper presents an improved clutter signal removal algorithm using Singular Value Decomposition(SVD). For indoor positioning system using IR-UWB Radar, the target signal is extracted from received signal. We use clutter signal removal algorithm using SVD for target signal extraction. Clutter signal removal algorithm using SVD has the advantage of operation but the disadvantage of high computational complexity. In this paper, we propose a method to improve computational complexity. As the experimental results, it is confirmed that the method presented in this paper improve the computational complexity of clutter removal algorithm using SVD.