분야
hwp1.
AM 송신
2.
진폭 변조(Amplitude Modulation)
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실험 1 : Message Signal
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실험 2 : Modulated Signal
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실험 3 : 변조지수(m)와 퍼센트 변조(% Mod)
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실험 4 : 100% 변조, 과변조(overmodulation), 전송효율
3.
AM 수신
4.
RF 단계
- 실험 목표(Exercise Objective)
1) 진폭 변조된 신호의 발생과정과 메시지 신호가 AM 신호의 모양에 어떤 영향을 주는가.
2) AM 신호 parameter들로부터 변조지수와 백분율 변조를 구하는 방법
3) 100% 변조, 과변조, 전송 효율의 정의 4) AM 신호 값을 측정하기 위한 오실로스코프 활용
Careful attention is required to ensure that phase errors in the demodulation carrier are minimized since
even small phase errors can result in serious distortion of the demodulated message waveform.
⇒ ⇒
※ Coherent demodulation : If is time varying in an unknown and unpredictable manner,
the effect of the phase error can be serious distortion of the demodulated output
An AM signal can be demodulated using the same coherent demodulation technique that was used for DSB.
The advantage of AM over DSB is that a very simple technique,
known as envelope detection or envelope demodulation, can be used.
