• Title/Summary/Keyword: Impulse Radio UWB

Search Result 102, Processing Time 0.03 seconds

Impulse Series for UWB-Based Cognitive Radio System

  • Zhang, Weihua;Shen, Hanbing;Bai, Zhiquan;Kwak, Kyung-Sup
    • ETRI Journal
    • /
    • v.29 no.4
    • /
    • pp.518-520
    • /
    • 2007
  • In this letter, we propose an impulse series for an ultra-wideband-based cognitive radio system which can utilize the spectrum dynamically by controlling the impulse positions and thus reduce the system complexity.

  • PDF

Investigation of Influences of UWB Antennas on Impulse Radio Channel (임펄스 전파 채널에서의 초광대역 안테나 영향 연구)

  • Park Young-Jin;Song Jong-Hwa;Kim Kwan-Ho
    • Journal of the Institute of Electronics Engineers of Korea TC
    • /
    • v.42 no.12
    • /
    • pp.165-170
    • /
    • 2005
  • In this paper, influences of a ultra wideband (UWB) antenna on impulse channel measurement are investigated in time domain (TD) and frequency domain (FD) as well. Firstly, impulse response of an UWB antenna is obtained and then using the result of impulse response of the UWB antenna, influences of the antenna on impulse radio channel is analyzed. Furthermore, using the impulse response of the UWB anenna, method of impulse radio channel analysis is presented by excluding the effect of the antenna from an impulse radio channel. For verifying the theory, a modified conical monopole antenna is designed for measuring impulse radio channel and its impulse response is obtained. After that, in order to investigate the effects of the UWB antenna on an impulse radio channel, multipath environments are set up in an anechonic chamber and transmission coefficient for each multipath environment is measured with an aid of vector network analyzer. Data measured in frequency domain is transformed into those in time domain by way of signal processing. Measurement shows that such properties of the antenna as dispersion and ringing affect impulse radio channel. Moreover, using the impulse response of the antenna, impulse response of only multipath channel is obtained.

RF Transceiver Design for Impulse Radio UWB System (임펄스 UWB 시스템을 위한 RF 송수신기 설계)

  • Park, Joo-Ho;Oh, Mi-Kyung;Oh, Jung-Yeol;Kil, Min-Su;Kim, Jae-Young
    • IEMEK Journal of Embedded Systems and Applications
    • /
    • v.4 no.1
    • /
    • pp.29-34
    • /
    • 2009
  • In this paper, we design RF transceiver architecture and building blocks for impulse radio UWB system. Impulse radio UWB signal occupies the wide frequency band which is very low transmission power. So, it can minimize the interference effect with the other system. Using UWB technology, we obtain position awareness service. Therefore, we describe the RF transceiver architecture of direct conversion receiver and define the requirement of RF transceiver. Moreover, we implement a prototype RF transceiver based on the presented standard and verify a function and performance through the wireless data communication and ranging test.

  • PDF

A Study on the QoS Improvement of Impulse Radio UWB System in Multiple Interference Environment (다중 간섭 환경에서 Impulse Radio UWB 시스템의 전송품질 향상에 관한 연구)

  • Jang, Se-In;Lee, Yang-Sun;Kim, Si-Gwan
    • Journal of the Korea Institute of Information and Communication Engineering
    • /
    • v.14 no.11
    • /
    • pp.2457-2462
    • /
    • 2010
  • In this paper, We applied CCI canceller to remove multiple access interference in co-channel environment and improved performance of Impulse Radio UWB system. Also, we have evaluated the performance of UWB system with Truncated Type-II Hybrid ARQ scheme for achieving high quality data transmission.

Performance Analysis of Interleaved Super Orthogonal Convolutional Coded UWB-IR System for Wireless Fading Environment (무선 페이딩 환경에 적합한 인터리브된 초직교 길쌈 부호화 UWB-IR 시스템의 성능 분석)

  • Kim Chang-Joong;Lee Ho-Kyoung
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
    • /
    • v.16 no.6 s.97
    • /
    • pp.556-562
    • /
    • 2005
  • In this paper, we propose interleaved super-orthogonal convolutional coded ultra wide-band impulse radio(ISOC-UWB-IR) system, and analyze its performance. The proposed system uses interleaver and deinterleaver to decorrelate the temporal correlation of the fading process and to obtain the diversity gain. We also suggest the three types of interleavers, which are pulse-wise interleaver(PI), pulse sub-group-wise interleaver(PSGI), and pulse group-wise interleaver(PGI). Performance analysis result shows that the interleaving scheme, rather than the code rate of super orthogonal convolutional code(SOC) encoder, affects the performance for the Rayleigh fading channel.

Design and Performance Evaluation of IR-UWB Tapered Slot Antenna for Optimum Impulse Radio Radiation (임펄스 신호 방사를 위한 IR-UWB용 테이퍼 슬롯 안테나 설계 및 성능평가)

  • Kim, Jong-Min;Koh, Young-Mok;Ra, Keuk-Whan
    • The Journal of The Korea Institute of Intelligent Transport Systems
    • /
    • v.11 no.5
    • /
    • pp.103-115
    • /
    • 2012
  • In this paper, design and performance evaluation of Tapered Slot Antenna for IR-UWB which propagates impulse radio is performed. TSA which has directional characteristic in UWB band should have low radiation loss and minimized impulse radiation distortion. In order to achieve these objectives, the paper designed wide band Impedance transformer and microstrip-slotline transit region structured TSA feeder line. By using the fabricated TSA, the radiation pattern was measured in the radio anechoic chamber. Pulse fidelity and distortion equation was induced to evaluate time domain characteristics according to the impulse radiation. Pulse fidelity of Impulse radiation show favorable results more than 93% within ${\pm}30^{\circ}$ beam width.

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
    • /
    • v.21 no.12
    • /
    • pp.1371-1379
    • /
    • 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.

A CMOS IR-UWB RFIC for Location Based Systems (위치 기반 시스템을 위한 CMOS IR-UWB RFIC)

  • Lee, Jung Moo;Park, Myung Chul;Eo, Yun Seong
    • Journal of the Institute of Electronics and Information Engineers
    • /
    • v.52 no.12
    • /
    • pp.67-73
    • /
    • 2015
  • This paper presents a fully integrated 3 - 5 GHz IR-UWB(impulse radio ultra-wide band) RFIC for Location based system. The receiver architecture adopts the energy detection method and for high speed sampling, the equivalent time sampling technique using the integrated DLL(delay locked loop) and 4 bit ADC. The digitally synthesized UWB impulse generator with low power consumption is also designed. The designed IR-UWB RFIC is implemented on $0.18{\mu}m$ CMOS technology. The receiver's sensitivity is -85.7 dBm and the current consumption of receiver and transmitter is 32 mA and 25.5 mA respectively at 1.8 V supply.

IEEE 802.15.4a IR-UWB System Design for Indoor Ranging and Communications (실내 무선측위/통신을 위한 IEEE 802.15.4a IR-UWB 시스템 설계)

  • Oh, Mi-Kyung;Park, Joo-Ho;Oh, Jung-Yeol;Kil, Min-Su;Kim, Jae-Young
    • IEMEK Journal of Embedded Systems and Applications
    • /
    • v.4 no.1
    • /
    • pp.16-22
    • /
    • 2009
  • This paper aims at designing an impulse-radio ultra-wideband (IR-UWB) transceiver, especially targeting the IEEE 802.15.4a indoor ranging and communication systems. We first investigate the IEEE 802.15.4a IR-UWB signals and suggest the full-digital transceiver architecture accordingly. Since the wireless systems equipped with the impulse signal have the property of low-duty cycle, i.e., discontinuity in time, while the conventional systems takes the continuous signals, it is required to reconfigure the system design, including link budget. Following brief introduction to our IEEE 802.15.4a IR-UWB system hardware, we finally examine the ranging performance in indoor environments to verify our system design.

  • PDF

Design of Single/Multiband Impulse Generator Using SRD for UWB(Ultra Wideband) Technique (SRD를 이용한 UWB 기술용 단일/멀티밴드 Impulse Generator의 설계)

  • Kim, Ki Nam;Kim, Ihn Seok
    • Journal of Advanced Navigation Technology
    • /
    • v.9 no.1
    • /
    • pp.1-8
    • /
    • 2005
  • In this paper, an impulse generator for UWB(Ultra Wide-band) technique with great possibility to be adopted as a next generation indoor WLAN(Wireless Local Area Network) has been designed by using SRD(Step Recovery Diode). Design goal is to design an impulse generator with simple structure, low cost, small size, and high performance. The impulse generator satisfied by FCC's regulation ( frequency range: 3.1~10.6 GHz, limit of power level: -41.25 dBm ) has been simulated by using ADS(Advanced Design System) which is the trade name of the Agilent Technologies. The output power of the impulse generator has been explained separately for single and multi band purposes, respectively.

  • PDF