• Title/Summary/Keyword: Off-Body Channel

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Experimental Study on the Effect of Antenna Polarization in WBAN Off-Body Channel (WBAN Off-Body 채널에서 안테나 편파의 영향 분석)

  • Jeon, Jaesung;Ahn, Byoungjik;Kim, Sunwoo;Choi, Jaehoon
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.24 no.2
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    • pp.144-151
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    • 2013
  • This paper investigates the effect of antenna polarization in Wireless Body Area Network(WBAN) off-body channel. The polarizations of antenna are divided into four combinations regarding Line-of-Sight(LOS) and Non-LOS(NLOS) environment. The human body keeps both still standing and moving to show that the impact of the polarization to signal. This paper confirms the performance depending on the polarization of receiver antenna and the combination of the polarizations on the off-body channel.

Analysis of Absorption Loss by a Human Body in On-to-Off Body Communication at 2.45 GHz

  • Jeon, Jaesung;Lee, Sangwoo;Choi, Jaehoon;Kim, Sunwoo
    • Journal of electromagnetic engineering and science
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    • v.15 no.2
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    • pp.97-103
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    • 2015
  • This paper investigates the effect of absorption loss by a human body to the received signal strength with respect to on-body transmitting antenna positions in on-to-off wireless body area networks. This investigation is based on measurement results obtained from experiments performed on human bodies (male and female) using planar inverted-F antennas in an anechoic chamber. The total absorption loss by the human body is also presented through the SEMCAD-X simulations. Our investigation showed that the received signal strength becomes lower when the transmitting antenna is mounted at a specific position where more absorption loss is experienced. The statistical analyses of on-to-off body channel characteristics based on the measurement results are presented.

Design and Fabrication of Buried Channel Polycrystalline Silicon Thin Film Transistor (Buried Channel 다결정 실리콘 박막 트랜지스터의 설계 및 제작)

  • 박철민;강지훈;유준석;한민구
    • Journal of the Korean Institute of Telematics and Electronics D
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    • v.35D no.12
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    • pp.53-58
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    • 1998
  • A buried channel poly-Si TFT (BCTFT) for application of high performance integrated circuits has been proposed and fabricated. BCTFT has unique features, such as the moderately-doped buried channel and counter-doped body region for conductivity modulation, and the fourth terminal entitled back bias for preventing kink effect. The n-type and p-type BCTFT exhibits superior performance to conventional poly-Si TFT in ON-current and field effect mobility due to moderate doping at the buried channel. The OFF-state leakage current is not increased because the carrier drift is suppressed by the p-n junction depletion between the moderately-doped buried channel and the counter-doped body region.

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Channel Characterization and Transmission Efficiency Analysis of Wireless Body Area Network (WBAN 채널 특성과 전송 효율 분석)

  • Ahn, Byoung-Jik;Song, Seong-Moo;Kim, Sun-Woo;Choi, Jae-Hoon
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.23 no.8
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    • pp.985-994
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    • 2012
  • This paper presents the real channel measurements and investigates their statistical characterization in wireless body area network(WBAN). In on-/off body channel, the measurements are performed with some representative human movements for considering human movements. Moreover, three signal transmission schemes with outage constraint are studied for getting total power consumption in each transmission scheme. Using the real channel measurements, between theoretical and realistic simulation are compared. This paper shows that power efficiency is improved through cooperative communication, and how much position of sensor node and human movement affect signal transmission power.

Link Budget and Performance Analysis of UWB Transmission Method for Off-body HDR Communication in WBAN System (WBAN에서 신체 외 고속통신을 위한 UWB 전송 방식의 링크버짓 및 성능 분석)

  • Choi, Nack-Hyun;Hwang, Jae-Ho;Jang, Sung-Jeen;Kim, Jae-Moung
    • The Journal of The Korea Institute of Intelligent Transport Systems
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    • v.8 no.1
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    • pp.53-64
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    • 2009
  • For a realization of the ubiquitous society, applying IT to vehicle industry has recently been an attractive issue to make wireless communication in body area network possible to everywhere. In this paper, we propose the physical layer symbol structure based on PPM scheme of the IEEE 802.15.4a for the off-body high data rate WBAN system. We propose four symbol structures which is classified according to the number of the chip and whether the channel coding is used or not. We calculate the required SNR through the link budget calculation and the recently proposed off-body WBAN channel environment was applied in the simulation. The results of four systems show that small number of burst's chip enhances the performance and the system is capable to achieve the data rate of 10 Mbps.

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An Analytical Model for Deriving The Threshold Voltage of A Short-channel Intrinsic-body SDG SOI MOSFET (Short-Channel Intrinsic-Body SDG SOI MOSFET의 문턱전압 도출을 위한 해석적 모델)

  • Jang, Eun-Sung;Oh, Young-Hae;Suh, Chung-Ha
    • Journal of the Institute of Electronics Engineers of Korea SD
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    • v.46 no.11
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    • pp.1-7
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    • 2009
  • In this paper, a simple analytical model for deriving the threshold voltage of a short-channel intrinsic-body SDG SOI MOSFET is suggested. Using the iteration method, both Laplace equations in intrinsic silicon body and gate oxide are solved two-dimensionally. Obtained potential distributions in both regions are expressed in terms of fourth and fifth-order of the coordinate perpendicular to the silicon channel direction. Making use of them, the surface potential is obtained to derive the threshold voltage in a closed-form. Simulation results show the fairly accurate dependencies of the threshold voltage on the various device parameters and applied bias voltages.

A Study for Co-channel Interference Mitigation in WBAN System (WBAN 환경에서 Co-channel 간섭 제거를 위한 연구)

  • Choi, W.S.;Kim, J.G.
    • Journal of rehabilitation welfare engineering & assistive technology
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    • v.5 no.1
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    • pp.35-40
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    • 2011
  • In this paper, we analyze that co-channel interference mitigation algorithms MMSE (Minimum Mean Square Error), OC (Optimal Combining), ML (Maximum Likelihood) using 2.4Ghz in WBAN (Wireless Body Area Network) system. Also analyze that scenario and channel model by IEEE 802.15.6. ML gives the best performance for all simulation. ML and OC have high complexity than MMSE complexity, because these algorithms should be known channel information of interference users. So these algorithms are difficult to apply to WBAN. Therefore we will study the interference mitigation algorithm that should be accomplished trade-off of between efficiency and complexity.

Effect of Body Movement and Position of Antenna on the Capacity of WBAN Channel (인체 움직임과 안테나 위치가 WBAN 채널 용량에 미치는 영향 분석)

  • Ahn, Chun-Soo;Ahn, Byoung-Jik;Kim, Sun-Woo;Choi, Jae-Hoon
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.23 no.2
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    • pp.229-234
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    • 2012
  • This paper presents channel measurements for wireless body area network(WBAN) and provides performance evaluation from the measurement. We measured the radio propagation in 2.45 GHz ISM band in an anechoic chamber according to various human movements and the position of transmit antennas. Two transmit antennas are mounted on different positions of human body for the purpose of comparing the diversity gain and correlation between the channels in $2{\times}1$ multiple-input single-output(MISO) systems. The experimental results show that the outage capacity is closely related with the correlation coefficient between channels in transmit diversity system.

Human Body Communication Using Chirp Spread Spectrum Modulation (Chirp spread spectrum 변조를 이용한 인체 내외 통신 기법)

  • Kim, Kyung-Chul;Jeon, Myeong-Woon;Kim, Ki-Hyun;Lee, Jung-Woo;Nam, Sang-Wook
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.35 no.5A
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    • pp.440-446
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    • 2010
  • Convergence of IT and BT is considered in many area, especially in medical care industry. The example of this trend is a capsule endoscope. But in a capsule endoscope, communication through human body has a few restrictions. At first, the transmit power should be limited not to have a bad effect on human organs and for the battery capacity. Second, the channel characteristic of human body has not been examined exactly. Third, general modulation / demodulation techniques which require a channel estimation cannot be used because of battery limit. There also may be a lot of interference signals because a capsule endoscope uses UWB bandwidth. In this paper, we introduce Chirp Spread Spectrum Differential Binary Phase Shift Keying(CSS-DBPSK) and propose Chirp Spread Spectrum On-Off Keying(CSS-OOK) which don't require a channel estimation and robust to interference signals. Using CSS-DBPSK or CSS-OOK, we can get 5 dB or 2~3 dB of Eb/N0 gain at 10-5 target BER. And if there are interference signals, those gains of CSS-DBPSK and CSS-OOK are increased.

Reduction of short channel Effects in Ground Plane SOI MOSFET′s (Growld Plane SOI MOSFET의 단채널 현상 개선)

  • ;;;;Jean-Pierre Colinge
    • Journal of the Institute of Electronics Engineers of Korea SD
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    • v.41 no.4
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    • pp.9-14
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    • 2004
  • This paper reports the measurement and analysis of the short channel effects and the punchthrough voltage of SOI-MOSFET with a self-aligned ground plane electrode in the silicon mechanical substrate underneath the buried oxide. When the channel length is reduced below 0.2${\mu}{\textrm}{m}$ it is observed that the threshold voltage roll-off and the subthreshold swing with channel length are reduced and DIBL is improved more significantly in GP-SOI devices than FD-SOI devices. It is also observed from the dependence of threshold voltage with substrate biases that the body factor is a higher in GP-SOI devices than FD-SOI devices. From the measurement results of punchthrough voltage, GP-SOI devices show the higher punchthrough voltages than FD-SOI devices