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

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IR-UWB Location Positioning System with Wireless Synchronization (무선 동기를 이용한 IR-UWB 무선 측위 알고리즘)

  • Kang, Ji-Mymg;Lee, Soon-Woo;Kim, Yong-Hwa;Park, Young-Jin;Kim, Kwan-Ho
    • Journal of the Institute of Electronics Engineers of Korea CI
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    • v.45 no.6
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    • pp.27-32
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    • 2008
  • Impulse Radio Ultra Wide Band (IR-UWB) system can be used to wireless position location system because of its unique very short pulse in the order of nanosecond. A few algorithms have been proposed to calculate location of sensors or tags. In this paper, we compare these algorithms and propose 'TDoA with wireless synchronization' as practical solution. Earlier algorithms need special logic to fix the duration to receive and send pulse or assume synchronization with wire. In proposed method, beacons synchronize each other using impulse and nodes can be made simple and cheap. We evaluated the performance and it shows 50% improved accuracy at the error range of 50cm.

A Study on Inverted Triangle Structural Planar Monopole Antenna with Edge (에지를 가진 역삼각형 구조 평면 모노폴 안테나에 대한 연구)

  • Choi, Hong-Ju;Lee, Yun-Min;Oh, Kyu-Jong
    • Journal of Advanced Navigation Technology
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    • v.15 no.4
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    • pp.549-555
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    • 2011
  • In this paper, inverted triangle structural planar monopole antenna with Edge for UWB Communication (3.1 ~ 10.6 GHz) is presented. The antenna have broadband property structurally through inverted triangle structural planar monopole which have edge. Monopole and ground of proposed antenna exist on coplanar plane, and excite as CPW. It used FR4 dielectric substrate of ${\epsilon}_r=4.4$, and the size is $20{\times}20{\times}1.6mm$. Return loss is more than - 10dB in 3.1 ~ 10.1 GHz (7.0 GHz). Radiation pattern is about the same that of dipole antenna at all frequency. At measured result, max gain is 8.44 dBi at E - plane.

Multiple Access Scheme Using Modified Hermite Polynomial Pulse and Ternary code for Out-Body WBAN (신체 외부 통신에서 MHP 펄스와 터너리 코드를 이용한 다중접속 기법)

  • Shim, Jae-Joon;Hwang, Jae-Ho;Kim, Jae-Moung
    • Journal of Internet Computing and Services
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    • v.12 no.1
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    • pp.27-38
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    • 2011
  • In this paper, we propose a multiple access scheme using MHP(Modified Hermite Polynomial) pulse and ternary code for high-data and low-data rate for Out-body WBAN(Wireless Body Area Network). To satisfy the requirement of WBAN system, UWB-IR has been considered as a promising candidate for Out-body WBAN. The proposed multiple access scheme, using orthogonal MHP pulse and ternary code sets, reduces multi-user interference and distinguishes user signal from multi-user signals. We propose two algorithms for synchronous and asynchronous WBAN system. The symbol is constructed by MHP pulses and time hopping duration to reduce multi-user interference in the synchronous WBAN system. The symbol also is constructed by ternary code to avoid collision between pulse trains in the asynchronous WBAN system. The results of the proposed multiple access scheme show a clear improvement of BER.

A Study of the Radiation Characteristics of Novel Printed Antenna Composed of Dual Elements with Different Shape (다른 형태를 가진 2소자 프린트 안테나의 방사특성에 관한 연구)

  • Lee, Chai-Bong;Kim, Jung-Hyun
    • Journal of the Institute of Convergence Signal Processing
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    • v.9 no.2
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    • pp.141-145
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    • 2008
  • When the current flows to parallel lines with different length, it is researched that the radiation is occured by the common-mode current radiates, and the small light weight antenna composed of dual elements by using the principle is proposed. However, there is a problem in production about this antenna because this liner antenna is structured by combining with wires. In this paper, we improved this liner antenna, and designed the plane antenna composed of dual elements with different length in the plane printed board to produce and to design easily. Furthermore, the antenna with the wide-band characteristic is also designed in the same board. The radiation pattern is similar to the dipole antenna on account of designing the triangular patch S, the notch and two tapers in patch S, the notch and two tapers in the antenna element. In result, it was able to design the antenna working wider band-width(the bandwidth ratio about 58%, $VSWR{\le}2$).

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A study of mitigated interference Chaotic-OOK system in IEEE802.15.4a (IEEE 802.15.4a 채널환경하에서의 저간섭 Chaotic OOK 무선통신기술의 BER 성능분석에 관한 연구)

  • Jeong, Jae-Ho;Park, Goo-Man;Jeon, Tae-Hyun;Seo, Bo-Seok;Kwak, Kyung-Sup;Jang, Yeong-Min;Choi, Sang-Yule;Cha, Jae-Sang
    • Journal of Broadcast Engineering
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    • v.12 no.2
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    • pp.148-158
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    • 2007
  • Recently, IEEE 802.15.4a(low-rate UWB) technique has been paid much attention to the LR-UWB communication system for WPAN. However, there are various interferences such as MPI(Multi Path Interference) or IPI(Inter Piconet Interference) in IEEE 802.15.4a wireless channel. In order to cancel various interferences occurred to WPAN environment, in this paper, we propose a UWB wireless communication system with high QoS(Quality of Service) which is a chaotic-OOK(On-Off Keying) system using unipolar ZCD(Zero Correlation Duration) spreading code in physical layer level. Furthermore, we analyze its performance via simulations and verify the availability of proposed system with prototype implementation.

Performance Analysis of Noncoherent OOK UWB Transceiver for LR-WPAN (저속 WPAN용 비동기 OOK 방식 UWB 송수신기 성능 분석)

  • Ki Myoungoh;Choi Sungsoo;Oh Hui-Myoung;Kim Kwan-Ho
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.30 no.11A
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    • pp.1027-1034
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    • 2005
  • IEEE802.15.4a, which is started to realize the PHY layer including high precision ranging/positioning and low data rate communication functions, requires a simple and low power consumable transceiver architecture. To satisfy this requirements, the simple noncoherent on-off keying (OOK) UWB transceiver with the parallel energy window banks (PEWB) giving high precision signal processing interface is proposed. The flexibility of the proposed system in multipath fading channel environments is acquired with the pulse and bit repetition method. To analyze the bit error rate (BER) performance of this proposed system, a noise model in receiver is derived with commonly used random variable distribution, chi-square. BER of $10^{-5}$ under the line-of-sight (LOS) residential channel is achieved with the integration time of 32 ns and signal to noise ratio (SNR) of 15.3 dB. For the non-line-of-sight (NLOS) outdoor channel, the integration time of 72 ns and SNR of 16.2 dB are needed. The integrated energy to total received energy (IRR) for the best BER performance is about $86\%$.

IEEE 802.15.4a채널환경하에서의 저간섭 Chaotic OOK 무선통신기술의 BER 성능분석에 관한 연구

  • Jeong, Jae-Ho;Park, Goo-Man;Jeon, Tae-Hyun;So, Bo-Seok;Kwak, Kyung-Sup;Cha, Jae-Sang
    • Proceedings of the Korean Society of Broadcast Engineers Conference
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    • 2006.11a
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    • pp.179-183
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    • 2006
  • 현재 WPAN(Wireless Personal Area Network) 전송기술의 하나인 IEEE 802.15.4a의 저속형 UWB(Ultra Wide Band) 기술이 활발하게 연구되어지고 있다. 하지만 IEEE 802.15.4a에서 제시된 WPAN 전송채널의 경우에는 심각한 멀티패스 간섭성분이 존재하여 이에 대한 해결방안이 절실히 요구되어지고 있다. 따라서 본 논문에서는, WPAN환경에서 전송채널의 심각한 멀티패스 성분을 물리계층(Physical layer) 레벨에서 근원적으로 해결하여 높은 QoS(Quality of Service)를 확보하게 해줄 수 있는 단극형 ZCD(are Correlation Duration)확산코드 기반의 Chaotic-OOK (On-Off Keying) 무선통신기술을 제안하고 IEEE 802.15.4a 채널 환경하에서의 모의실험을 통한 성능평가를 통해 제안한 무선통신기술의 유용성을 입증하였다.

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BER analysis of CSS MODEM algorithm for WPAN based on binary ZCD (이진 ZCD 코드 기반의 WPAN용 CSS 변복조 알고리즘의 BER성능분석에 관한 연구)

  • Yeo, Wun-Seo;Yoon, Seung-Keum;Lee, Seon-Hee;Choi, Sung-Jin;Cho, Ju-Phil;Kim, Seong-Kweon;Cha, Jae-Sang
    • Proceedings of the Korean Society of Broadcast Engineers Conference
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    • 2006.11a
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    • pp.207-211
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    • 2006
  • IEEE 802.15.4a에서는 첩(Chirp)신호을 이용한 UWB(Ultra Wide Band) 시스템으로서 DBO(Differential Bi-Orthogonal)-CSS(Chirp Spread Spectrum) 기술을 선택적 표준안으로 정하였다. 기존 DBO-CSS에서는 다중 피코넷 간섭(MPI; Multiple Piconets Interference)을 피하기 위하여 각 피코넷 별로 Different Time-Gap을 할당하고 있다 하지만 완벽한 직교성이 존재하지 않는다는 특성을 가지고 있어서 간섭의 영향에 민감할 수 밖에 없고, 무선통신시스템의 성능 저하를 야기시킨다. 본 논문에서는 각 피코넷 별로 보다 완전한 직교성을 확보하기 위하여, 확산코드기법을 적용한 CSS 변복조 알고리즘을 제안하고, 또한 일정한 시간 구간동안 연속적인 직교특성을 가지는 이진 ZCD(Zero Correlation Duration) 코드를 사용하여 BER(Bit Error Rate) 성능 분석을 통해 SOP(Simultaneously Operating Piconets) 환경에서 다중 피코넷 간섭 등의 영향을 효과적으로 제거함을 확인하였다.

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An indoor localization approach using RSSI and LQI based on IEEE 802.15.4 (IEEE 802.15.4기반 RSSI와 LQI를 이용한 실내 위치추정 기법)

  • Kim, Jung-Ha;Kim, Hyun-Jun;Kim, Jong-Su;Lee, Sung-Geun;Seo, Dong-Hoan
    • Journal of Advanced Marine Engineering and Technology
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    • v.38 no.1
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    • pp.92-98
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    • 2014
  • Recently, Fingerprint approach using RSSI based on WLAN has been many studied in order to construct low-cost indoor localization systems. Because this technique is relatively evaluated non-precise positioning technique compared with the positioning of Ultra-Wide-Band(UWB), the performance of the Fingerprint based on WLAN should be continuously improved to implement various indoor location. Therefore, this paper presents a Fingerprint approach which can improve the performance of localization by using RSSI and LQI contained IEEE 802.15.4 standard. The advantages of these techniques are that the characteristics of each location is created more clearly by utilizing RSSI and LQI and Fingerprint technique is improved by using the modified Euclidean distance method. The experimental results which are applied in NLOS indoor environment with various obstacles show that the accuracy of localization is improved to 22% compared to conventional Fingerprint.

Link Adaptation Method of the Block Coded Modulation for UWB-IR (무선광대역통신을 위한 블록부호화방식의 링크 적응 기법)

  • Min, Seungwook
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.19 no.7
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    • pp.24-35
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    • 2018
  • In wireless communications environments, a link adaptation technique that selects the proper rate from among several transmission rates is adopted to cope with variations in channel status. In block coded modulation, the frame time and/or the block length can be adjusted to the channel status. A smaller frame time can cause inter-frame interference (IFI), however, a larger frame time can reduce the data rate. Therefore, frame time is the design factor decided by a tradeoff between performance and the data rate. This paper presents a method to determine the frame time based on the processing gain for the channel model, CM1~CM4, recommended by IEEE 802.15a. Also, a link adaptation technique for block coded modulation is proposed for efficient communications by varying the frame time and the block length. Through simulation, link adaptation can be carried out with a step size of 2~5 nsec in a frame time range of 14~ 50 nsec for channel models CM1~CM4.