• Title/Summary/Keyword: UWB(Ultra-Wide Band)

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A Research on Low-power FFT(Fast Fourier Transform) Design for Multiband OFDM UWB(Ultra Wide Band) Communication System (Multiband OFDM UWB(Ultra Wide Band) 통신시스템을 위한 저전력 FFT(Fast Fourier-Transform) 설계에 관한 연구)

  • Ha, Jong-Ik;Kim, In-Soo;Min, Hyoung-Bok
    • Proceedings of the KIEE Conference
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    • pp.2119.1_2120.1
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    • 2009
  • UWB(Ultra Wide Band)는 차세대 무선통신 기술로 무선 디지털펄스라고도 한다. GHz대의 주파수를 사용하면서도 초당 수천~수백만 회의 저출력 펄스로 이루어진 것이 큰 특징이다[1]. 기존 무선통신 기술의 양대 축인 IEEE 802.11과 블루투스 등에 비해 속도와 전력소모 등에서 월등히 앞서고 있으며, SoC(System on a Chip)의 저전력 구현에 대한 연구가 활발히 진행되고 있다. OFDM은 크게 FFT(Fast Fourier Transform) 블록, Interpolation /decimation 필터 블록, 비터비 블록, 변복조 블록, 등화기 블록 등으로 구성된다. 고속 시스템에서는 대역효율성이 우수한 OFDM(Orthogonal Frequency Division Multiplexing) 방식을 사용하고 있으며, OFDM 전송방식은 직렬로 입력되는 데이터 열을 병렬 데이터 열로 변환한 후에 부반송파에 실어 전송하는 방식이다. 이와 같은 병렬화와 부반송파를 곱하는 동작은 IFFT와 FFT로 구현이 가능한데, FFT 블록의 구현 비용과 전력소모를 줄이는 것이 핵심사항이라고 할 수 있다. 기존논문에서는 OFDM용 FFT 구조로 단일버터플라이연산자 구조, 파이프라인 구조, 병렬구조 등의 여러 구조가 제안되었다[2]. 본 논문에서는 Radix-8 FFT 알고리즘 기반의 New partial Arithmetic 저전력 FFT 구조를 제안하였다. 제안한 New partial Arithmetic 저전력 FFT구조는 곱셈기 대신 병렬 가산기를 이용 하여 지금까지 사용되는 FFT 구조보다 전력소모를 줄일 수 있음을 보였다.

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A Study on the Detecting of Noncontact Biosignal using UWB Radar (UWB 레이더를 이용한 비접촉 생체신호 검출에 관한 연구)

  • Lee, Yonggyu;Cho, Joonggil;Kim, Taesung
    • Journal of the Korea Safety Management & Science
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    • v.21 no.4
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    • pp.1-6
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    • 2019
  • This study relates to acquiring biological signal without attaching directly to the user using UWB(Ultra Wide Band) radar. The collected information is the respiratory rate, heart rate, and the degree of movement during sleep, and this information is used to measure the sleep state. A breathing measurement algorithm and a sleep state detection algorithm were developed to graph the measured data. Information about the sleep state will be used as a personalized diagnosis by connecting with the medical institution and contribute to the prevention of sleep related diseases. In addition, biological signal will be linked to various sensors in the era of the 4th industrial revolution, leading to smart healthcare, which will make human life more enriching.

An Improved ToA Estimation in a Compressed Sensing-based UWB System (압축센싱 기반의 UWB 시스템에서 개선된 ToA 추정 기법)

  • Le, Tan N.;Kim, Kwang-Yul;Shin, Yo-An
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.36 no.6C
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    • pp.376-383
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    • 2011
  • Since the first arrival path may not be the strongest path of UWB(Ultra Wide Band) multipath channels, this makes ToA(Time-of-Arrival) estimation becomes a challengeable issue. Furthermore, because of ultra bandwidth of received signals, the compressed sensing theory is employed to reduce the complexity caused by very high Nyquist sampling rate in coherent UWB receivers. In this paper, we propose a ToA estimation scheme which provides precise estimation performance, while exploiting the benefits of compressed sensing-based UWB receivers. Simulation results show that the proposed scheme can outperform other low complexity schemes in a wide range of signal-to-noise ratios.

An Improved TDoA Localization with Particle Swarm Optimization in UWB Systems (UWB 시스템에서 Particle Swarm Optimization을 이용하는 향상된 TDoA 무선측위)

  • Le, Tan N.;Kim, Jae-Woon;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.87-95
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    • 2010
  • In this paper, we propose an improved TDoA (Time Difference of Arrival) localization scheme using PSO (Particle Swarm Optimization) in UWB (Ultra Wide Band) systems. The proposed scheme is composed of two steps: re-estimation of TDoA parameters and re-localization of a tag position. In both steps, the PSO algorithm is employed to improve the performance. In the first step, the proposed scheme re-estimates the TDoA parameters obtained by traditional TDoA localization to reduce the TDoA estimation error. In the second step, the proposed scheme with the TDoA parameters estimated in the first step, re-localizes the tag to minimize the location error. The simulation results show that the proposed scheme achieves a more superior location performance to the traditional TDoA localization in both LoS (Line-of-Sight) and NLoS (Non-Line-of-Sight) channel environments.

A Design and Manufacture of Modified Rhombus Slot UWB antenna with Fork-shaped-Feedline (포크 모양의 급전 구조를 갖는 변형된 마름모 슬롯 UWB 안테나 설계 및 제작)

  • Ha, Sung-Jea;Yoon, Joong-Han
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.20 no.7
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    • pp.1221-1228
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    • 2016
  • In this paper, we propose a modified rhombus slot UWB(Ultra Wide Band) antenna with fork-shaped feeding structure. The proposed antenna is modified rhombus slot structure and fork-shaped feeding structure to get ultra-wideband characteristics for UWB communication. Modified rhombus slot structure consists of slot shaped which eliminated upper and lower part of the basic rhombus slot. The antenna is designed on an FR-4 substrate of which the dielectric constant is 4.4, and its overall size is $34mm(W_1){\times}34mm(L_1){\times}1mm(t)$, and its slot antenna size is $30mm(W_2){\times}16.75mm(L_3+L_4)$. After carrying out the simulation of each parameters, optimized values are obtained. From the fabricated and measured results, return loss of the proposed antenna satisfied Return Loss -10dB in 3.1 ~ 10.6 GHz. And measured results of gain and radiation patterns characteristics displayed for operating bands.

Design of UWB Antenna with Fork-type structure and circular patch (원형 패치와 포크형 구조가 결합된 UWB 안테나)

  • Ha, Yun-Sang;Kim, Gi-Rae;Choi, Young-Kyu;Yun, Joong-Han
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.20 no.10
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    • pp.1837-1844
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    • 2016
  • This paper proposes an antenna of the fork type structure that operates in the UWB (Ultra Wide Band) frequency band (3.1 ~ 10.6 GHz). The proposed antenna is attached a circular patch in order to obtain the UWB band characteristics to the fork-type patch antenna. The ground plane is implemented in a arc-shape configuration. The effect of various parameters of the modified fork type radiating patch and partial arc ground plane for UWB operation is investigated. The proposed antenna is made of $34.0{\times}50.0{\times}1.0mm^3$ and is fabricated on the permittivity 4.4 FR-4 substrate. The experiment results shown that the proposed antenna obtained the -10 dB impedance bandwidth 8200 MHz (2.7 ~ 10.9 GHz) covering the UWB bands. This result satisfied the characteristics of ultra-wideband and the proposed antenna will be applicable to an ultra wideband system.

Design and Implementation of CPW-Fed UWB Monopole Antenna (CPW 급전 방식을 이용한 UWB 모노폴 안테나 설계 및 구현)

  • Yu, Ju-Bong;Jeon, Jun-Ho;An, Chan-Kyu;Kim, Woo-Chan;Yang, Woon-Geun
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.21 no.2
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    • pp.218-223
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    • 2010
  • In this paper, a novel CPW(Coplanar Waveguide)-fed UWB(Ultra Wide Band) antenna is designed, implemented, and measured for UWB communications. CPW-fed planar antenna has advantages of wide-bandwidth, low-cost and easy interaction with radio frequency front end circuitry. We have used HFSS(High Frequency Structure Simulator) of Ansoft which is based on the FEM(Finite Element Method) to simulate the proposed antenna. FR-4 substrate of thickness 1.6 mm and relative permitivity 4.4 is used for implementation. The proposed antenna showed VSWR(Voltage Standarding Wave Ratio)${\leq}2$ for the frequency band from 3.1 GHz to 10.6 GHz which is used for ultra wide band communication. Measured peak gains are 2.61, 4.95, 2.89, 7.35 dBi at 3, 6, 8, 11 GHz, respectively.

A design and manufacture of CPW-Fed UWB antenna with notched WLAN band by using a U shaped slot (U자형 슬롯을 사용하여 WLAN 대역이 제거된 CPW 급전 방식을 갖는 UWB 안테나 설계 및 제작)

  • Ha, Yun-Sang;Kim, Gi-Rae;Yun, Joong-Han
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.19 no.11
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    • pp.2518-2525
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    • 2015
  • In this paper, we propose a UWB(Ultra Wide Band) antenna with CPW(Coplanar Waveguide) structure notched the 802.11a(5.15 ~ 5.825 GHz) band by using the U shaped slot. The proposed antenna not only shows Ultra-Wideband characteristic(3.1 ~ 10.6 GHz) suitable for UWB communications but has partially notched-band characteristic to reject 5 GHz WLAN band(5.15 ~ 5.825 GHz). The antenna is designed on an FR-4 substrate of which the dielectric constant is 4.4, and its overall size is $30mm(W){\times}20mm(L){\times}1mm(t)$. Fabricated antenna satisfied $VSWR{\leq}2$ in 3.1 ~ 10.6 GHz except for the band rejection of 5.15 ~ 5.825 GHz. And measured results of gain and radiation patterns characteristics displayed determined for operating bands.