• Title, Summary, Keyword: UWB

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The research of the UWB system radiation measurement (UWB 시스템의 방사출력 측정방법 연구)

  • Song, Hong-Jong;Cha, Jae-Sang
    • The Journal of The Institute of Internet, Broadcasting and Communication
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    • v.10 no.5
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    • pp.277-286
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    • 2010
  • In this paper we analyse radiation measurement method for UWB wireless system of the wideband low power frequency characteristics. In the radiation measurement environment we discuss RMS electric field strength, UWB PSD, UWB detect signal level, UWB noise signal collection etc.. also, we discuss power measure method of the CISPR16-1, low level e.i.r.p radiation measurement method. lastly we analyse consideration problem for the signal analyser of the UWB system.

Performance Analysis of UBW Communication System using Time-Hopping PPM modulation (Time-Hopping PPM 변조를 이용한 UWB 통신 시스템의 성능 평가)

  • 변건식;이민혁;전제훈
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.8 no.1
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    • pp.220-226
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    • 2004
  • Ultra-wideband(UWB) communication applications is a recent innovation due to high transmission rate and low power emission. Therefore, it is important to research UWB signal's characteristics and modulation methods to apply to various UWB communication technologies. In this paper the characteristics of Gaussian monopulse which is capable of using UWB communication was analyzed and we compared the performance of PPM and PAM modulation method. Also we analyzed the interference effect of QPSK system with different center frequencies in the present of various UWB noises and simulated simple UWB transceiver system.

Analysis and Measurement of Interferences between UWB and Mobile Communication System (UWB 시스템과 이동통신 시스템간의 간섭측정 분석)

  • Kim Myung-Jong;Lee Hyung-Soo;Hong Ic-Pyo;Shin Yong-Sup
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.15 no.10
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    • pp.1011-1017
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    • 2004
  • 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 Korean Cellular CDMA and WCDMA. This paper experimentally evaluates the interference from two kinds of UWB sources, namely a direct-sequence spread-spectrum CDMA(DS-CDMA) UWB source and an impulse radio UWB source, to a Cellular CDMA and WCDMA digital transmission system. The average frame error rate degradation of each system are presented. From these experimental results, the interference effects of DS-CDMA UWB source is not severe compared to the Impulse UWB.

A study on wireless endoscope technology development combined with UWB communication module (UWB 통신모듈을 결합한 무선 내시경 기술 개발에 관한 연구)

  • Shim, Dongha;Lee, Jongsung;Rho, Jungkyu;Lee, Minwoo;Cha, Jaesang
    • Journal of Satellite, Information and Communications
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    • v.9 no.1
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    • pp.17-21
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    • 2014
  • In this paper, we proceeded a study about the wireless endoscopic technology development combined with UWB communication module for endoscope. Firstly, we proposed needs of UWB wireless endoscope technology development related to domestic endoscope industry and UWB communication technology. Also, we develop a wireless endoscope combined with UWB communication module. In this paper, the proposed UWB wireless endoscope technology can acquire a endoscope image using UWB communication method. It can transfer a image at high data rate using DB and Smart Device linkage technology, an effective and trusted diagnosis is possible. The proposed UWB wireless communication module combined with UWB communication module is expected to be widely utilized.

UWB 측위 기술 소개 및 기술 동향

  • Lee, Chang-Eun;Seong, Tae-Gyeong
    • Information and Communications Magazine
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    • v.34 no.4
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    • pp.33-38
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    • 2017
  • 본고에서는 최근 새로이 각광받고 있는 UWB 기술을 소개한다. IR-UWB 측위 관련 국내 및 해외 동향을 살펴보고, IR-UWB 표준에 의거하여 IR-UWB 신호 및 프레임 구조, 계층 구조 등에 대하여 서술하였다. 그리고 IR-UWB를 이용하여 고정밀 거리추정 및 위치추정을 하는 연구 동향에 대하여 살펴보았으며, 마지막으로 기술 동향을 정리하여 IR-UWB 관련 회사의 제품을 소개하였다.

Performance Analysis of M-ary PPM UWB Suitable to FCC Signal Spectrum (FCC 신호 스펙트럼에 적합한 M-ary PPM UWB 시스템의 성능분석)

  • ;;Brant Parr
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.28 no.8A
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    • pp.633-643
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    • 2003
  • UWB impulse radio signals have an very short duration, extremely wide bandwidth and share the same frequency spectrum with other existing systems. It was determined by the Federal Communications Commission (FCC) that UWB systems could cause interference with other systems, such as Global Positioning System (GPS) for example. Therefore, at present. the FCC has restricted the use of UWB systems to frequencies above 3.1㎓. In this paper, We evaluated performance of UWB system using proposed pulses in [1][2] that are strictly limited in time to remove interference while, at the same time, contain their power distribution to a frequency band from 3.1㎓ to 10.6㎓. In particular, We evaluated the BER Performance in relation to system parameters such as pulse duration. $\delta$, the number of users. Nu. and the number of symbols, M. We found the optimal pulse duration $\delta$ through computer simulation using developed UWB pulses in [1][2]. It is shown that performance evaluation between the UWB communication system using these UWB pulses [1][2]and the Gaussian monocycle pulse in M-ary PPM and BPSK schemes. These results can be contributed to construct M-ary PPM UWB communication system in terms of multiuser parameters and pulse duration.

TH-UWB System through Pulse Shaping and Avoiding Interference Technique (펄스 성형을 통한 TH-UWB 시스템 구현과 간섭 회피 제안)

  • Chang, Hong-Mo;Kim, Tae-Hun;Kim, Dong-Hee;Park, Ho-Hwan;Kwak, Kyung-Sub
    • The Journal of The Korea Institute of Intelligent Transport Systems
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    • v.6 no.3
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    • pp.111-121
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    • 2007
  • In this paper, we propose a TH-Multiband-UWB system through pulse shaping to fit in domestic UWB spectrum regulation. We propose the transmission pulse of Multi-Carrier type for pulse shaping and use Cognitive Radio to detect interfering frequency. We use Genetic Algorithm in Cognitive Radio's calculation propose and propose solution of interference problem between TH-UWB using Cognitive Radio and typical MB-OFDM UWB system or other communication systems. In this paper, we explain how Cognitive Engine detects the interfering frequency. The technique of TH-Multiband-UWB system using Cognitive Radio shows a good performance in interference condition.

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The Interference Measurement Analysis between 3.412 GHz Band Broadcasting System and UWB Wireless Communication System

  • Song Hong-Jong;Kim Dong-Ku
    • Journal of electromagnetic engineering and science
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    • v.6 no.1
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    • pp.76-81
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    • 2006
  • Ultra wideband(UWB) technologies have been developed to exploit a new spectrum resource in substances and to realize ultra-high-speed communication, high precision geo-location, 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 wireless systems sharing the frequency bands such as Broadcasting system. This paper experimentally evaluates the interference from two kinds of UWB sources, namely a orthogonal frequency division Multiplex UWB source and an impulse radio UWB source, to a Broadcasting transmission system. The receive power degradations of broadcasting system are presented. From these experimental results, we show that in all practical cases UWB system can coexist 35 m distance in-band broadcasting network.

IEEE 802.11a Interference Suppression Method Using by SVD Algorithm in LR-UWB Systems (LR-UWB 시스템에서 특이값 분해를 이용한 IEEE 802.11a 간섭억압기법)

  • Kim, Dong-Hee;Kim, Tae-Hun;Jang, Hong-Mo;Park, Ho-Hwan;Kwak, Kyung-Sup
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.33 no.1A
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    • pp.74-84
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    • 2008
  • UWB radio systems have drawn attention during the last few years. These systems are the core technique for ubiquitous home and enable to co-exist with other narrow band systems over the same frequency without interfering them. But UWB signals have a very low power per pulse, so they are affected by strong narrow band interferences. Specially, IEEE 802.11a systems which operate around 5GHz overlap the band of UWB signals and they will interfere with UWB systems significantly. In this paper, we propose a novel narrow band interference suppression method based on singular value decomposition(SVD) algorithm for DS-UWB in IEEE 802.15.4a channel model. The proposed method is very effective and robust for both a single user DS-UWB system and a multiuser DS-UWB system to reduce the narrow band interference.