• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2003년도 하계종합학술대회 논문집 I
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• pp.194-197
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• 2003

We proposed Binary ASK system for 1Giga bit Modem. The Binary ASK system has a high speed shutter transmitter and no IF receiver only by symbol synchronization. The advantage of proposed system is that circuitry is very simple without IF process. The disadvantage of proposed system are that line spectrum occurs unordinary interference to other channels, and enhancement to 4-level system is impossible due to its large SNR degradation.

• 한국정보통신학회논문지
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• 제16권1호
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• pp.26-32
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• 2012

본 연구에서는 인공지능 알고리즘을 이용하여 밀리미터파 대역에서 사용되는 giga-bit modem을 위한 ASK 시스템의 성능 개선을 제안한다. 본 연구에서 적용할 인공지능 알고리즘은 퍼지 논리 시스템이다. 제안한 퍼지 논리 시스템의 입력은 수신단의 counter에서 발생하는 remainder와 remainder의 적분합을 이용하고, 출력은 LPF의 bandwidth이다. 본 연구의 유용성을 위해 제안한 방식과 bandwidth가 고정된 방식에 대해 BER 성능을 확인하는 시뮬레이션을 수행한다. 시뮬레이션을 통해 제안한 방식과 bandwidth가 고정된 방식의 성능을 비교 검토한다.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2003년도 ICCAS
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• pp.1749-1753
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• 2003

We proposed several systems for 1Giga bit Modem. The first, Binary ASK(Amplitude Shift Keying) system has a high speed shutter transmitter and no IF(Intermediate Frequency) receiver only by symbol synchronization. The advantage of proposed system is that circuitry is very simple without IF process. The disadvantage of proposed system are that line spectrum occurs interference to other channels, and enhancement to 4-level system is impossible due to its large SNR degradation. The second, Binary phase modulation system has a high speed shutter transmitter and IF-VCO(IF-Voltage Controlled Oscillator) control by base-band phase rotation. Polarity of shutter window is changed by the binary data. The window should be narrow same as above ASK. The advantage of proposed system is which error rate performance is superior. The disadvantage of proposed system are that Circuitry is more complex, narrow pull-in range of receiver caused by VCO and spectrum divergence by the non-linear amplifier. The third, 4-QAM(Quadrature Amplitude Modulation)system has a nyquist pulse transmitter and IF-VCO control by symbol clock. The advantage of proposed system are that signal frequency band is a half of 1GHz, reliable pull-in of VCO and possibility of double speed transmission(2Gbps) by keeping 1GHz frequency-band. The disadvantage of proposed system are that circuit complexity of pulse shaping and spectrum divergence by the non-linear amplifier.