最小频移键控信号调制解调器的结构特点

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摘要

文章讨论了利用各种具有高抗噪水平的方案构建最小频移键控信号调制解调器的具体特点。文章对这些信号和频率调制信号的形成进行了分析,包括定量指标和比较特性。研究了两种最小频移键控信号解调器方案(相干和自相关),包括它们的比较特性。利用时序图描述了这些解调器电路的工作原理,制定了对相干解调器中包含的参考振荡发生器的要求,以及对最小频移键控信号的要求,这些要求可确保二进制信号量化的最小频移键控信号自相关解调器具有最大的抗噪能力。
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STRUCTURE FEATURES OF MINIMUM FREQUENCY SHIFT KEYING SIGNAL MODEMS
The article discusses specific features of constructing modems for minimum frequency shift keying signals using various schemes with high noise immunity levels. An analysis of the formation of these signals and frequency modulation signals, which are orthogonal if enhanced, is provided, including quantitative indicators and comparative characteristics. Two schemes of minimum frequency shift keying signal demodulators (coherent and autocorrelation) are examined, including their comparative features. Operation principles of these demodulator circuits with the use of timing diagrams are described, requirements for the reference oscillator generators included in coherent demodulators are formulated, as well as the requirements for minimum frequency shift keying signals, which ensure the greatest noise immunity in autocorrelation demodulators of minimum frequency shift keying signals with binary signals quantization.
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