• Title/Summary/Keyword: UWB Channel Model

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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.

Performance of Rake Receiver for Pulse Position Modulation-Time Hopping Ultra Wide Band Systems in Indoor Environments (실내 환경의 펄스 위치 변조-시간 도약 초광대역 무선통신 시스템에서 레이크 수신기 성능)

  • Kim, Joo-Chan;Kim, Jin-Young
    • The Journal of the Institute of Internet, Broadcasting and Communication
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    • v.10 no.3
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    • pp.179-184
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    • 2010
  • In this paper, we analyze and simulate the performance of RAKE receiver for ultra wide band (UWB) systems in indoor multipath radio channel. Pulse position modulation-time hopping (PPM-TH) signal is considered. And we also consider three types of RAKE receivers, which are ideal RAKE, selective RAKE, and partial RAKE receivers. The indoor channel is modeled as the modified Saleh and Valenzuela (SV) model which has been proposed as a UWB channel model by the IEEE group, IEEE 802.15.SG3a.

The Verification of DS-UWB Channel Model in Indoor (실내에서 DS-UWB 시스템의 채널 모델링 및 검증)

  • Jang, Pil-Seon;Kwon, Han-Jun;Ko, Young-Eun;Bang, Sung-Il
    • Proceedings of the IEEK Conference
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    • 2006.06a
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    • pp.43-44
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    • 2006
  • In this paper modeled UWB system transmission channel in apartment environment while furniture and household electric appliance etc. existed. We measured from 10MHz to 16.01GHz by using method of CIR and CTF in both LOS and NLOS environment. Also we design channel model simulator by MATLAB. The Result of Simulation shows BER characteristics by SNR.

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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.

A Statistical Model for the Ultra-Wide Bandwidth Indoor Apartment Channel (실내 아파트 환경에서의 통계적 UWB 채널 모델)

  • Park Jin-Hwan;Lee Sang-Hyup;Bang Sung-Il
    • Journal of the Institute of Electronics Engineers of Korea TC
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    • v.42 no.9 s.339
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    • pp.19-28
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    • 2005
  • We establish a statistical model for the ultra-wide bandwidth (UMB) indoor channel based on over 2000 frequency response measurements campaign in a Practical apartment. The approach is based on the investigation of the statistical properties of the multipath profiles measured in different place with different rooms. Based on the experimental results, a characterization of the propagation channel from theoretic view point is described. Also we describe a method for measurement of the channel impulse response and channel transfer function. Using the measured data, the authors compares channel impulse responses obtained from time-domain and channel transfer functions obtained from frequency-domain with statistical path loss model. The bandwidth of the signal used in this experiment is from 10MHz to 8.01 GHz. The time-domain results such as maximum excess delay, men excess delay and ms delay spread are presented. As well as, omni-directional biconical antenna were used for transmitter and receiver In addition, measurements presented here support m channel model including the antenna characteristics.

Performance analysis of UWB RAKE Receiver in multi-Path channel (다중 경로 채널환경에서 UWB RAKE 수신기의 성능분석)

  • Oh, Se-Wang;Oh, Tae-Won
    • Proceedings of the Korea Electromagnetic Engineering Society Conference
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    • 2003.11a
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    • pp.594-598
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    • 2003
  • In this paper, we analyze the performance of UWB(Ultra-WideBand) communication system employing Bi-phase modulation and RAKE Receiver under the MAI(Multiple Access Interference) and the OSI(Other System Interference) environment. Using the multi-path channel model recommended by IEEE P802.15.TG3a, the performance degradation Is described with the number of users, the number of RAKE fingers and training sequences. To meet BER 10e-4 for 20 users at the same time, the number of RAKE fingers are proposed from 3 to 32. And the number of training sequences are limited less than 8 to keep the channel estimation error within 3dB

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MIMO MB-OFDM System (MIMO MB-OFDM 시스템)

  • Heo Joo;Chang Kyung Hi
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.29 no.10A
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    • pp.1177-1188
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    • 2004
  • This paper describes and analyzes the performance of MB-OFDM UWB system that is suggested as one of standards in IEEE 802.15 TG3a for UWB application. UMBchannel model that has been contributed in IEEE 802.15 SG3a is a wideband channel model of 6Ghz bandwidth, so we modify it to have 3 subband channels that are obtained by filtering conventional U Channel, considering center frequency hopping and system bandwidth. From simulations, we compare performances of MB-OFDM system in AWGN and WB channel and verify the frequency and time domain diversity gains from time End frequency spreading technique. We also compare and analyze the performance of proposed SFBC MB-OFDM with that of conventional MB-OFDM system. Simulation results show SFBC MB-OFDM system outperforms conventional MB-OFDM system about 1.5dB of Eb/No at target BER of 10$^{-m4}$./.

Performance Analysis of Double Binary Turbo Coded PPM-TH UWB Systems (이중 이진 터보 부호화된 펄스 위치변조-시간도약 초광대역 무선 통신 시스템의 성능 분석)

  • Kim, Eun-Cheol;Kwak, Do-Young;Park, Jae-Sung;Kim, Jin-Young
    • 한국정보통신설비학회:학술대회논문집
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    • 2008.08a
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    • pp.429-432
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    • 2008
  • In this paper, performance of a double binary turbo coded ultra wide band (UWB) system is analyzed and simulated in an indoor wireless channel. Binary pulse position modulation-time hopping (BPPM-TH) signals are considered. The indoor wireless channel is modeled as a modified Saleh and Valenzuela (SV) channel. The performance is evaluated in terms of bit error probability (BER). From the simulation results, it is seen that double binary turbo coding offers considerable coding gain with reasonable encoding complexity. It is also demonstrated that the performance of the UWB system can be substantially improved by increasing the number of iterations.

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Angle-of-arrival Estimation fit for an Elliptical Scattering Channel in a Wireless Positioning (무선 위치 인식에서 타원형 산란 채널에 적합한 초광대역 신호 도착 방향 추정)

  • Lee, Yong-Up;Park, Joong-Hoo
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.33 no.11C
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    • pp.949-954
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    • 2008
  • An ultrawide band (UWB) signal model is proposed to estimate the angle-of-arrivals of the signals arrived in clusters at an UWB receiver for a short-range, high-speed, indoor wireless communication system in an elliptical scattering environment. And a new estimation technique is proposed by modifying the conventional MUSIC algorithm. By using this estimation technique, the estimates of the two unknown parameter sets, angle-of-arrivals and distribution parameters, are obtained with the proposed UWB signal model. The proposed UWB signal model and estimation technique are verified through computer simulations in an ultrawide band communication environment.