• Journal of IKEEE
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• v.25 no.1
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• pp.156-167
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• 2021

In this paper, we propose a digital transceiver unit design for in-building of 5G optical repeaters that extends the coverage of 5G mobile communication network services and connects to a stable wireless network in a building. The digital transceiver unit for driving the proposed 5G optical repeater is composed of 4 blocks: a signal processing unit, an RF transceiver unit, an optical input/output unit, and a clock generation unit. The signal processing unit plays an important role, such as a combination of a basic operation of the CPRI interface, a 4-channel antenna signal, and response to external control commands. It also transmits and receives high-quality IQ data through the JESD204B interface. CFR and DPD blocks operate to protect the power amplifier. The RF transmitter/receiver converts the RF signal received from the antenna to AD, is transmitted to the signal processing unit through the JESD204B interface, and DA converts the digital signal transmitted from the signal processing unit to the JESD204B interface and transmits the RF signal to the antenna. The optical input/output unit converts an electric signal into an optical signal and transmits it, and converts the optical signal into an electric signal and receives it. The clock generator suppresses jitter of the synchronous clock supplied from the CPRI interface of the optical input/output unit, and supplies a stable synchronous clock to the signal processing unit and the RF transceiver. Before CPRI connection, a local clock is supplied to operate in a CPRI connection ready state. XCZU9CG-2FFVC900I of Xilinx's MPSoC series was used to evaluate the accuracy of the digital transceiver unit for driving the 5G optical repeater proposed in this paper, and Vivado 2018.3 was used as the design tool. The 5G optical repeater digital transceiver unit proposed in this paper converts the 5G RF signal input to the ADC into digital and transmits it to the JIG through CPRI and outputs the downlink data signal received from the JIG through the CPRI to the DAC. And evaluated the performance. The experimental results showed that flatness, Return Loss, Channel Power, ACLR, EVM, Frequency Error, etc. exceeded the target set value.

• Proceedings of the Korea Society of Information Technology Applications Conference
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• 2003.06a
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• pp.79-79
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• 2003

• NEWSLETTER 전기공업
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• no.98-23 s.216
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• pp.18-30
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• 1998

• 한국전기화학회:학술대회논문집
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• 1999.04a
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• pp.22-22
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• 1999

• The Proceedings of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.25 no.2
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• pp.87-97
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• 2011

• Electrical & Electronic Materials
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• v.18 no.6
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• pp.3-9
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• 2005

• 전기의세계
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• v.59 no.7
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• pp.14-17
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• 2010

• Proceedings of the KIEE Conference
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• 1987.07b
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• pp.1085-1089
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• 1987

• 전기의세계
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• v.30 no.3
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• pp.146-151
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• 1981

본고의 내용은 다음과 같다. 1. 광섬유의 구조와 특성 2. Numerical Aperture(NA) 3. 편광현상(Polarization effect) 4. 신호의 감쇄 5. 투과 대여폭(Transmission Bandwidth)

• 전기의세계
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• v.30 no.2
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• pp.76-80
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• 1981

본고에서는 엘리베이터의 Car를 원활하게 가속, 주행, 감속시키기 위한 전동기 제어부문과 건물각층과 Car내부로 부터의 신호를 처리하기 위한 시퀀스 베어부문으로 나우어 설명했다.