• Title/Summary/Keyword: UWB

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Analysis of Ranging Performance According to Analog Front End Characteristics in a Noncoherent UWB System (Noncoherent UWB 시스템에서 Analog Front End 특성에 따른 레인징 성능 분석)

  • Kim, Jae-Woon;Park, Young-Jin;Lee, Soon-Woo;Shin, Yo-An
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.35 no.1C
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    • pp.77-86
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    • 2010
  • In this paper, we present a noncoherent IR-UWB (Impulse Radio-Ultra Wide Band) ranging system with an AFE (Analog Front End) composed of a simple integrator and an 1-bit ADC (Analog-to-Digital Converter), and define AFE characteristics affecting the ranging performance. This system is realistic and easy to implement, since the integrator simply accumulates signal energies and the simple 1-bit ADC is applied instead of the multi-bit ADCs for coherent IR-UWB systems. On the other hand, its ranging accuracy is largely affected channel environments such as noise, multipath fading and so on, since the noncoherent receiver simply squares and integrates the received signals. However, despite these practical importances, there are few conventional researches on the performance analysis according to AFE characteristics in IR-UWB ranging systems. To this end, we analyze in this paper ranging performance according to AFE characteristics for the noncoherent IR-UWB ranging system in various wireless channel environments, and through these results we also present system parameters to be considered in UWB hardware designs.

A Study on Object Classification Using IR-UWB (IR-UWB를 이용한 물체 분류에 관한 연구)

  • Gam, Ji-Hyeon;Jeong, Jae-Hoon;Byun, Gi-Sig;Kim, Gwan-Hyung
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • pp.88-90
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    • 2018
  • There are many studies on IR-UWB Radar. A number of studies have been conducted on the Personnel count and measurement distance to person, mainly using IR-UWB. In this paper, however, we use IR-UWB Radar to distinguish objects. In order to distinguish these objects, in this paper, the IR-UWB radar is operated by positioning the object at a certain distance and the object is classified by using the size and shape of the wave reflected by the object. To distinguish objects using only the size and shape of these waveforms, SVM (Support Vector Machine) was used to classify objects by learning shape and size of waveforms. In this paper, we show that the size and shape of the waveform received by the IR-UWB Radar can be identified by SVM pattern learning.

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A Performance Evaluation of MB-OFDM UWB System Considering the Domestic DAA Regulation (국내 DAA 기술 기준을 고려한 MB-OFDM UWB 성능 평가)

  • Shin, Cheol-Ho;Choi, Sang-Sung
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.19 no.9
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    • pp.1000-1009
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    • 2008
  • The purpose of this paper is to analyze the performance of MB-OFDM UWB system when the interference signal that can be WIMAX signal or 4 G system signal is received by detection limit of -80 dBm/MHz proposed in Korea for DAA(Detect And Avoid) to permit UWB in $3.1{\sim}4.8$ GHz. MB-OFDM UWB system supports two transmission modes; one is TFI(Time frequency Interleaving) mode that transmits OFDM symbols using different carrier frequency from symbol to symbol according to Time Frequency(TF) codes, the other is FFI(Fixed Frequency Interleaving) mode that transmits OFDM symbols using a specific carrier frequency. In this paper, we considered the TX average power and the synchronization structure to reflect the effect of frequency hopping according to TFC. Interference analysis results show that the WiMAX system is fenced thoroughly from UWB interference in domestic DAA regulation, but the performance of MB-OFDM UWB system is degraded seriously by an interference signal with the DAA detection limit even in frequency Hopping mode that can get frequency diversity effect.

A Design of Non-Coherent CMOS IR-UWB Receiver (비동기식 CMOS IR-UWB 수신기의 설계 및 제작)

  • Ha, Min-Cheol;Park, Young-Jin;Eo, Yun-Seong
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.19 no.9
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    • pp.1045-1050
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    • 2008
  • In this paper presents a CMOS RF receiver for IR-UWB wireless communications is presented. The impulse radio based UWB receiver adopts the non-coherent demodulation that simplifies the receiver architecture and reduces power consumption. The IR-UWB receiver consists of LNA, envelop detector, VGA, and comparator and the receiver including envelope detector, VGA, and comparator is fabricated on a single chip using $0.18{\mu}m$ CMOS technology. The measured sensitivity of IR-UWB receiver is down to -70 dBm and the BER $10^{-3}$, respectively at data rate 1 Mbps. The current consumption of IR-UWB receiver except external LNA is 5 mA at 1.8 V.

Miniaturized Half-Circular-Slot UWB Antenna Design (소형화된 반원형-슬롯 UWB 안테나의 설계)

  • Jang, Joon-Won;Choi, Kyoung;Hwang, Hee-Yong
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.19 no.3
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    • pp.329-335
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    • 2008
  • This paper proposes a miniaturized half-circular-slot UWB antenna. Using an analysis of the neld patterns, we show that the original circular-slot UWB antenna operates on a series of multi-pole radiation based on $TE_n$ modes, and a perfect magnetic wall exists along an axis of symmetry on the antenna. Using the perfect magnetic wall we designed and fabricated the miniaturized UWB antenna on RF-60A substrate with t=0.64mm, ${\varepsilon}_r=6.15\;and\;tan\;{\delta}=0.0025$, which not only has the half size of the original but also maintains UWB characteristics. The measured gain of the miniaturized antenna is $-2.1{\sim}4.3dBi$, which is comparable with the gain, $-2.7{\sim}3.1dBi$, of the original circular-slot UWB antenna. The radiation pattern is also similar to that of the original antenna.

Design and Implementation of UWB Antennas for Wireless Video Transceiver Handset (무선 영상 송수신 단말기용 UWB 안테나 설계 및 구현)

  • Lee, Sung-Ock;Chae, Jeong-Sik;Jung, Hoe-Kyung
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.16 no.4
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    • pp.686-691
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    • 2012
  • Deviating from the exclusive frequency assignment, UWB has utilized much wider frequency range, worked independently without interfering other frequencies, and simultaneously enabled to increase more than hundreds of Mbps data transmission rate. In considering its high data rate and no interference, UWB certainly has an infinite and technical potential. In this paper, we studied the UWB technology as well as its technological trend, analyzed UWB antenna, and actualized a small antenna for wireless video streaming devices.

Analysis of Impulse Dispersion for IR-UWB Antenna Using Time-Frequency Analysis (시간-주파수 분석을 이용한 IR-UWB 안테나 임펄스 분산 특성 분석)

  • Koh, Young-Mok;Ra, Keuk-Hwan
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.21 no.12
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    • pp.1371-1379
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    • 2010
  • This paper presents an analysis of impulse dispersion for impulse radio ultra-wide band(IR-UWB) antenna. A set of antenna structure configurations are highlighted with verification based on the STFT(Short Time Fourier Transform) in 3.1~5.1 GHz: first, a taper-slotted antenna allowing the optimal impulse transmission, and second, 4 types of the omni-directional IR-UWB antenna using different feed structures(microstrip line, and CPW(Coplanar Waveguide)). The proposed STFT allows the analysis of the IR-UWB antenna's dispersion characteristic.

Adaptive Multiple Antenna Transmission Scheme in DS-UWB System (직접 확산 초 광대역 통신에서의 적응 다중 안테나 전송 기법)

  • Song Hyoung-Kyu;Kook Hyung-Joon
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.30 no.12C
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    • pp.1208-1213
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    • 2005
  • Recently, ultra wideband(UWB) is emerging as a solution for the IEEE 802.15.3a(TG3a) standard because of its potential to enable high-speed data transmission with low power consumption. One of the submitted systems as s PHY proposal is M-ary biorthogonal keying direct sequence ultra wideband(M-BOK DS-UWB). In this paper, adaptive multiple antenna transmission scheme for achieving high capacity and reliability in M-BOK DS-UWB is proposed. This proposed system can overcome the limitations of STBC and V-BLAST, such as bit error rate performance and throughput.

Performance Evaluation of Time Hopping Pulse Position Modulated Ultra-Wideband System for Home Sensor Network (홈 센서 네트워크를 위한 주파수 도약 펄스 위치 변조된 초 광대역 시스템의 성능 평가)

  • Roh, Jae-Sung
    • Journal of Advanced Navigation Technology
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    • v.10 no.3
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    • pp.268-275
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    • 2006
  • The rapid proliferation of in-home and office information applications and services is driving the need for new wireless technologies enabling wideband short range multimedia communications. Due to the growing demand for higher quality media and faster wireless connections, several IEEE standardization groups are considering very high data rate alternatives physical layer(s) for Wireless Personal Area Network (WPAN). The Ultra Wide Band (UWB) multiple access technology based on very narrow pulse transmission, is one viable candidate for these applications providing very high bit rates services, low power consumption and accurate positioning capability. In this paper we provide a methodology to evaluate the UWB system BER performance in UWB wireless fading networks with power controlled UWB devices are considered. Results can be used to analyze the performance of a given network topology and to provide useful design ideas for an UWB home sensor network.

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Performance Analysis for TR-UWB System Exploiting Complex Frequency-Components (복소 주파수 성분 처리를 통한 TR-UWB 시스템의 성능분석)

  • Jang, Dong-Heon;Yang, Hoon-Gee
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.13 no.2
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    • pp.253-260
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    • 2009
  • This paper, mathematically analyzes the performance of newly proposed TR-UWB system which the frequency components of a UWB pulse were processed so that the system could be implemented with ADCs of a few MHz sampling rate, and presents the comparison with an existing frequency-domain based TR-UWB system. The comparison is mainly based on the SNR ratio which depends on the mean and the variance of the frequency components. We also shows that the simulation results to support the theoretical analysis where the comparison is made under the IEEE 802.15.3a channel model as well as AWGN channel.