• Title/Summary/Keyword: Full Duplex

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Development of a Transcutaneous Optical Information Transmission System for Total Artificial Heart Using Near Infrared Laser

  • Lee, Jung-Hoon;Kim, Wook-Eun;Choi, Jong-Hoon;Ahn, Jae-Mok;Min, Byoung-Goo
    • Proceedings of the KOSOMBE Conference
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    • v.1997 no.05
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    • pp.64-67
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    • 1997
  • In the total artificial heart(TAH), a transcutaneous information transmission system(TITS) is vely important to monitor the TAH status and detect the device failure, and repair the possible problems. First of all, the communication channel(skin) and method were simulated in terms of transmittance, scattering, reflection and absorption, then the system was designed with size reduction including low power consumption and reliability compared to the previous one. The informations are transmitted through the skin(approximately 1cm in depth) by frequency modulated near infrared(NIR) pulses using 780nm laser diodes as transmitters and photodiode as receiver with high speed and high spectral sensitivity. The logic high and low frequencies are 3MHz, 1MHz respectively. The system is a bidirectional data link for more than 38.4Kbps data rate, full-duplex with a bit error rate of less than $10^{-5}$.

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The Design of A Nonlinear Echo Canceller (비선형 반향제거기의 설계)

  • Park, Chan-Ho;Kim, Hwan-Yong
    • Journal of the Korean Institute of Telematics and Electronics S
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    • v.35S no.9
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    • pp.104-110
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    • 1998
  • This paper proposes a architecture of the nonlinear echo canceller for the full-duplex transmission, which is easy to implement. The architecture is designed to cancel the nonlinear echo signals due to the hybrid or the data converter, as well as the linear echo signals, by adding a small number of taps to the FIR structure for the linear echo cancellation. The number of tap to be add depends on how much the linear echo signals are cancelled. A computer program for this architecture was written and run. Numerical results of the computer simulations show good performances on cancellations of the nonlinear echo signals by adding a small number of taps.

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The Nuri Process Educational Insect Robot(Bee) which Equips a Link Structure (링크구조를 갖춘 누리과정 교육 곤충(나비)로봇)

  • Park, Young-Suk;Park, Dea-Woo;Shin, Jae-Han
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • 2012.10a
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    • pp.149-153
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    • 2012
  • The common process of full 5 three infantile department of pedagogy nurtures of 2012 department of pedagogy department is world process. For the early rising department of pedagogy originality education of the national talented man it uses the educational robot. The research is necessary in about development and production of the world process educational robot which equips a duplex link structure. Development it produces the world process educational insect robot which equips a link structure from the present paper. The present paper research it leads and early rising department of pedagogy originality education of the national talented man leads and will contribute in the national competitive power improvement which a national education development and the robot renovation of the nation leads.

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Loop-back System Using Mach-Zehnder Modulator (Mach-Zehnder 변조기를 이용한 Loop-back System)

  • Kim, Hui-Ju;Gang, Dong-Seong;Jeon, Geum-Su;Ban, Jae-Gyeong
    • Journal of the Institute of Electronics Engineers of Korea SD
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    • v.38 no.7
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    • pp.479-485
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    • 2001
  • In this paper, we propose optical subcarrier mutiplexing(SCM) transceiver module for base station(BS) that has no optical source and can be used for full-duplex communication over single optical fiber. In this method we retransmit optical modulated signal to the central office(CO) using loop-back system with a ring type Mach-Zehnder modulator(MZM) in BS, where optical source is transmitted from the CO. We have modeled the ring type MZM and were conformed that the measured results were in good agreement with the modeling. In the ring type MZM, the optical symmetric position of the MZM is very important in RF signal transmission.

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Design and Implementation of Mobile Teleconference System Based on Hybrid Web (하이브리드 웹 기반의 모바일 회의시스템 설계 및 구현)

  • Kim, Yun Kyoung;Choi, Ji Hyun
    • KIPS Transactions on Computer and Communication Systems
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    • v.2 no.10
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    • pp.437-444
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    • 2013
  • Recently, there are several attempts to save temporal, spatial and paper resources through mobile teleconference. However, present application-based mobile solutions have limited access, and are occasionally not working because of its operating system dependency. In recent times, several researchers attempt to develop mobile teleconference systems that can operate in all operating systems. It is still required to install proprietary applications to sync screens in user device. In this paper, we propose a full duplex and real-time data mirroring technology based on hybrid web that allows syncing screens without application installation, and operates in all mobile devices.

A Study on the Design of Echo-Canceller using SIA(Stochastic Iteration Algorithm) (SIA(Stochastic Iteration Algorithm)을 이용한 반향제거기 설계에 관한 연구)

  • Cho, Hyon-Mook;Kim, Sang-Hoon;Park, Nho-Kyung;Moon, Dai-Tchul;Tchah, Kyun-Hyon
    • The Journal of the Acoustical Society of Korea
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    • v.13 no.2
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    • pp.38-49
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    • 1994
  • This paper proposes Echo canceller used in simultaneous two-way ('full-duplex') transmission of data signals over two-wire circuits which can be achieved by using a hybrid coupler. This Echo canceller uses sequential processing instead of parallel processing with conventional adaptive digital filter. This structure reduces the number of multipliers. Thus, this structure is much more suitable for IC implementation. This Echo canceller operates according to the 'Stochastic Iteration Algorithm(SIA).' SIA algorithm has merit of good performance and small hardware requirement.

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Pass loss characteristics of full-duplex video transmission system car to platform at tunnel and road (18GHz 차지상간 양방향 영상전송시스템의 도로 및 터널 구간에서 경로손실 특성)

  • Jeong, Sang-Guk;Choi, Gab-Bong;An, Tae-Ki;Kim, Back-Hyun;Park, Jong-Chol;Yong, Dong-Seok
    • Proceedings of the KIEE Conference
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    • 2009.04b
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    • pp.177-179
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    • 2009
  • It is increased that need of broadband multimedia service to make useful environment for user and to support the operation of railway system. So study of integrated data transmission in a subway and railway is activated. The research deals with pass loss characteristics of 18GHz microwave that is assigned frequency of integrated data transmission in a subway and railway. It is used sample integrated transmission system in subway and railway of KRRI(korea railroad research Institute) at the tunnel and road. Specification of test sample system is blow. It use OFDM modulation, Wireless frequency is 18GHz and 19GHz, Maximum output power is 20dBm, Receive sensitivity is -90dBm. The pass loss exponent and standard variation of road and tunnel is analyzed.

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Development of an Autonomous Tractor System Using Remote Information Processing (원격 정보처리를 이용한 자율주행 트랙터 시스템의 개발)

  • 조도연;조성인
    • Journal of Biosystems Engineering
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    • v.25 no.4
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    • pp.301-310
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    • 2000
  • An autonomous tractor system was developed and its performance was evaluated. The system consisted of a tractor system of and a remote control station. The tractor and the remote control station communicated each other via wireless modems. The tractor had a DGPS(differential global positioning system), sensors, a controller and a modem. The DGPS collected position data and the tractor status was estimated. The information of tractor status and sensors was transferred to the remote control station. Then, the control station determined the control data such as steering angles using a fuzzy controller. The fuzzy controller used the information from the DGPS, sensors, and GIS(geographic information system) data. The control data were obtained by remote signal processing at the control station The control data for autonomous operation were transferred to the tractor controller. The performances of an autonomous tractor were evaluated for various speeds, different initial positions and different initial headings. About 1.3 seconds of time lag was occurred in transferring the tractor status data and the control data. Compensation the time lag, about 27cm deviation was observed at the speed of 0.5m/s and 37cm at the speed of 1m/s. Error caused mainly by the time lag and it would be reduced by developing a full-duplex radio module for controlling the remote tractor.

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Virtual Resource Allocation in Virtualized Small Cell Networks with Physical-Layer Network Coding Aided Self-Backhauls

  • Cheng, Yulun;Yang, Longxiang;Zhu, Hongbo
    • KSII Transactions on Internet and Information Systems (TIIS)
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    • v.11 no.8
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    • pp.3841-3861
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    • 2017
  • Virtualized small cell network is a promising architecture which can realize efficient utilization of the network resource. However, conventional full duplex self-backhauls lead to residual self-interference, which limits the network performance. To handle this issue, this paper proposes a virtual resource allocation, in which the residual self-interference is fully exploited by employing a physical-layer network coding (PNC) aided self-backhaul scheme. We formulate the features of PNC as time slot and information rate constraints, and based on that, the virtual resource allocation is formulated as a mixed combinatorial optimization problem. To solve the problem efficiently, it is decomposed into two sub problems, and a two-phase iteration algorithm is developed accordingly. In the algorithm, the first sub problem is approximated and transferred into a convex problem by utilizing the upper bound of the PNC rate constraint. On the basis of that, the convexity of the second sub problem is also proved. Simulation results show the advantages of the proposed scheme over conventional solution in both the profits of self-backhauls and utility of the network resource.

Real-Time H/W Implementation of RPE-LTP Speech Coder for Digital Mobile Communications (디지틀 이동 통신용 RPE-LTP 음성 부호화기의 실시간 H/W 구현)

  • 김선영;김재공
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.16 no.1
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    • pp.85-100
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    • 1991
  • In the discussion of digital mobile communication systems the speech coder based on the high quality low bit rate is an essential part of topics to overcome the limited availability of radio spectrum, which will enhance the communication services. In this paper we present the implementation and performance evaluation of 13kbps RPE LTP speech coder. An implementation of a real time full duplex coder with 75% of DSP loading rate using a single DSP chip has been shown, and also the fixed point simulations for H/W implementation has been performed. Finally, analysis result for relative bit importance of each transmitting parameter has been shown for channel coding.

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