• Title, Summary, Keyword: transmitter

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Development of 60GHz Millimeter-wave Transmitter using NRD Guide

  • Shin, Cheon-Woo
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.25 no.7A
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    • pp.1057-1062
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    • 2000
  • Allow me to introduce the development of an FM transmitter. The transmitter uses millmeter waves at the frequency of 60 GHz, and it can produce as much as 20 mW power with the band width of 1 GHz. The great feature of the FM transmitter is that it has been created by the special technique of utilizing the NRD (non radiative dielectric) waveguide. The advantage of adopting the NRD waveguide is that it can significantly reduce transmission loss. We can construct a small-size NRD guide transmitter in a simple way that has superb transmission performance. The NRD guide transmitter is very useful for CATV transmission or transmission over a wide range. In addition, the transmitter has almost the same band width as optical communication, and the data transmission speed of the transmitter is faster than that of optical communication. A transmitter with these merits would be highly appreciated as a way of ultra-highspeed communication network over short distances.

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Diagnosis of Optical FSK Transmitter Output Characteristics Using Michelson Interferometer (Michelson 간섭계를 이용한 광 FSK 송신기 특성검출)

  • 박상영;이규송;임호근;전광석;김창민;홍완혜
    • Journal of the Korean Institute of Telematics and Electronics A
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    • v.28A no.10
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    • pp.806-813
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    • 1991
  • In this paper, we suggested the diagnosis of the optical FSK transmitter output characteristics using the Micheloson interferometer. The transmitter is designed by the direct frequency modulation effect of a semoconductor laser diode. The optical FSK transmitter consists of a temperature stabilized semiconductor laser diode and an optimally designed equalizer. It is modulated by 100Mbit/s PRBS Generator to diagonosis of Optical FSK transmitter output characteristics. The Michelson Interferometer is used for the optical frequency discriminator which transforms the output frequency of the transmitter to the amplitude of light. The measurement of the performance of the transmitter to the amplitude of light. The measurement of the performance of the transmitter computer the transmitted data and their eye pattern with the simulation results, the received data and their eye pattern. As the result of experiment, the data transfer rate of the transmitters is 100Mbit/s.

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A Study on the implementation of a Portable Http Live Streaming Transmitter (휴대용 Http 라이브 스트리밍 전송기 구현에 관한 연구)

  • Cho, Tae-Kyung;Lee, Jea-Hee
    • The Transactions of the Korean Institute of Electrical Engineers P
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    • v.63 no.3
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    • pp.206-211
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    • 2014
  • In this Paper, We proposed the HLS(Http Live Streaming) transmitter which is operated easily and cheap in all networks and client environments compared to the exist video live streaming transmitter. We analyzed the HLS protocol and then implemented for making the HLS transmitter cheaper and portable. After designing the HLS transmitter hardware using the RISC processor of Arm11 core, we ported the Linux Operating System and implemented the HLS protocol using the open source FFmpeg and Segmenter. For the performance evaluation of the developed HLS transmitter, we made the testing environment which is including the notebook, iPhone, and aroid Phone. In this testing environment, we analysed the received video data at the client displayer. As a results of the performance evaluation, we could certify that the proposed HLS transmitter has a higher performance than the Apple company's HLS.

Spherical Flux Concentration Transmitter for Omnidirectional Wireless Power Transfer with Improved Power Transmission Distance (전력전송거리 증가를 위한 구형 자속 집중 송신부 구조의 설계 및 해석)

  • Park, Kwang-Rock;Cha, Hwa-Rang;Kim, Rae-Young;Kim, Tae-Jin
    • The Transactions of the Korean Institute of Power Electronics
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    • v.25 no.3
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    • pp.181-187
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    • 2020
  • In this study, we propose a spherical flux concentration structure for omnidirectional wireless power transfer. Omnidirectional wireless power transfer technology is a method that can transmit power to a transmitter located in an arbitrary position in a two-dimensional or three-dimensional space. However, to improve the power transfer distance in a wireless power transfer system, the diameter of the coil or the number of windings must increase, thereby increasing the size of the transmitter. The proposed transmitter structure adds a ferrite core inside the transmitter coil so that the magnetic flux generated by the transmitter is directed toward the position of the receiver. As a result, the flux linkage and the mutual inductance increase. By implementing the omnidirectional wireless power transfer system using the proposed structure, the power transfer distance can be improved by 65% compared with the conventional system without increasing the size of the transmitter. Simulation shows that the proposed spherical flux concentration structure increases the mutual inductance of the omnidirectional wireless power transmission system.

High Speed Serial Link Transmitter Using 4-PAM Signaling (4-PAM signaling을 이용한 high speed serial link transmitter)

  • Jeong, Ji-Kyung;Lee, Jeong-Jun;Burm, Jin-Wook;Jeong, Young-Han
    • Journal of the Institute of Electronics Engineers of Korea SD
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    • v.46 no.11
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    • pp.84-91
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    • 2009
  • A high speed serial link transmitter using multi-level signaling is proposed. To achieve high data rate m high speed serial link, 4-pulse amplitude modulation (PAM) is used. By transmitting 2 bit data in each symbol time, high speed data transmission, two times than binary signaling, is achieved. The transmitter transmits current-mode output instead of voltage-mode output Current-mode output is much faster than voltage-mode output, so higher data transmission is available by increasing switching speed of driver. $2^5-1$ pseudo-random bit sequence (PRBS) generator is contained to perform built-in self test (BIST). The 4-PAM transmitter is designed in Dongbu HiTek $0.18{\mu}m$ CMOS technology and achieves 8 Gb/s, 160 mV of eye height with 1.8 V supply voltage. The transmitter consumes only 98 mW for 8 Gb/s transmission.

DESIGN AND IMPLEMENTATION OF THE ALL DIGITAL QPSK TRANSMITTER FOR MPEG-2 PACKETS SUPPORTING THE DAVIC STANDARD

  • Park, Sungsoo;Lee, Youngkou;Kim, Kiseon
    • Proceedings of the IEEK Conference
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    • pp.914-918
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    • 2000
  • In this paper, a next generation high speed QPSK transmitter is designed based on 1.8${\mu}$m design rule. The designed transmitter supports the MPEG2-TS coded packed data for the DAVIC standard. Transmitter is composed of the convolutional coder, the shortened Reed-Solomon coder, and QPSK modulator. The coded packets are modulated in APSK with an RC filter. Especially, Galois Field multiplier with a standard basis is designed with the pipelined parallel architecture. Also, in the QPSK modulator, the RC filter and mixer are simplified into the ROM table, which can improve the performance of the transmitter. The total number of gates for the implemented baseband transmitter is 26,875.

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Development of a miniaturized FM transmitter with low power

  • Ryu, Jeong-Tak;Kim, In-Gyeong;Kim, Yeon-Bo;Kim, Jong-Pil
    • Proceedings of the Korea Society for Industrial Systems Conference
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    • pp.629-633
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    • 2008
  • Recently, there has been great interest in the application of short-range wireless communication system. In this paper, the miniaturized FM transmitter with low power is developed, and laboratory tests have been carried out. The FM transmitter uses FM radio waves to send sound from any system (MP3, PMP, PDA, MP3 Phone et.) to any nearby radio or stereo system. The transmitter is designed with $2.6cm{\times}2.6cm{\times}2.6cm$ system size. The operating voltage is 3.7 V and used the built-in storage battery. The system can use continuously during 7 hour with once charging. The transmission frequency can select one of 88.1 MHz, 88.3 MHz, or 88.5 MHz in compliance with utility condition. The channel separation ability is 40 dB. The operating temperature is $-10{\sim}+85^{\circ}C$, which use in the industry environment. Consequently, this system sis used conveniently with short distance information transmitter system at the industry field.

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Design of Multi-carrier Digital Transmitter Using a Direct Conversion Scheme (직접변환방식을 이용한 멀티캐리어 디지털 송신기 설계)

  • 신관호;조성언;오창헌
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.28 no.6A
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    • pp.425-432
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    • 2003
  • In this paper, we designed a multi-carrier digital transmitter for CDMA base-station using a direct conversion scheme and verified the performance through circuit simulations. We examined a new technology required to design a multi-carrier transmitter, then designed and simulated a multi-carrier digital transmitter. ADS (Advanced Design System), RF simulation S/W of Agilent Technologies, was used for designing and simulating the multi-carrier digital transmitter. First, we simulated a digital block and an analog block separately, then performed a co-simulation for entire system. From the results, the final analog outputs of the designed multi-carrier digital transmitter met the spectrum mask characteristics of IS-97 & 3G TS 25.104 standard requirements. It means that proposed scheme could be applied to implement a multi-carrier digital transmitter for CDMA base-station. Therefore, proposed multi-carrier digital transmitter using a direct conversion scheme can accomplish cost-reduction and improvements of technology in the next CDMA base-station.

Implementation of NTSC TV Transmitter Module (NTSC TV Transmitter Module의 구현)

  • Kim Kwang-Tae;Sim Myoung-Su
    • Journal of the Institute of Electronics Engineers of Korea SC
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    • v.43 no.2
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    • pp.28-32
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    • 2006
  • In this paper, NTSC TV Transmitter Modulo will be designed and produced which make possible playing the motion picture not only on TV but also on portable TV. NTSC TV Transmitter Module modulates signals that received Video and Audio signals from a mobile on NTSC TV CH4 mechanism. so it has an advantage of convenience that watching the motion picture of mobile on TV without any other cable through transmitting signals by wireless. But it has some demerits of long size antenna and noise sensitiveness. In the future, if some problems like a size of antenna distortion of signal and noise can be solved through continuous researching about Radio Frequency part, it is possible to play mobile motion pictures on the more media like a camcorder, DVD player and so on.

A Study on the Influence of Mutual Inductance between Wayside Transmitter and On-board Receiver upon Frequency Response in ATS Device (ATS 장치에서 지상자와 차상자 사이의 상호인덕턴스가 주파수 응답에 미치는 영향)

  • Kim, Min-Seok;Kim, Min-Kyu;Lee, Jong-Woo
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.61 no.3
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    • pp.384-393
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    • 2012
  • Railroad signaling systems perform controlling the distance and routes between trains. Signaling methods on the wayside are to control passively the train speed by using signal flags which are installed on the wayside. ATS(Automatic Train Stop) device is used as the signaling method on the wayside in Korea. The ATS device is assistance equipment of engineers. Signal information is transmitted by combining mutual inductance between the wayside transmitter and on-board receiver. The wayside transmitter performs changing oscillation frequency according to the signal information. The on-board receiver performs controlling the train by receiving the frequency. Currently, the oscillation frequency on the on-board receiver is 78[kHz] in case of normal state. When the on-board receiver is over the wayside transmitter, the oscillation frequency is changed by capacitors of the wayside transmitter according to signal flags. In case of changing the oscillation frequency, the waveform is modified in the wayside transmitter and on-board receiver. This phenomenon is that other signals or communication frequency are included. In this paper, electric model between the wayside transmitter and on-board receiver is suggested and frequency response in the wayside transmitter and on-board receiver including other signals is estimated by the coupling coefficient. Also, the value of coupling coefficient is proposed to exclude other signals and demonstrated by using Matlab and PSpice program.