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本文叙述一种用于数字传输的新式调频,称为受控调频(TFM)。人们所希望的恒幅包络信号问题总是与最大频谱节约联系在一起的。频谱节约问题非常重要,特别是在无线电信道中更是如此。受控调频的带外辐射低于其它已有的固定包络调制技术,采用同步检波,与四相调制相比其误码特性仅有1dB之差。TFM 的含义是指对发射机振荡器频率的特别控制,使已调信号相位变为具有相关特性时间的平滑函数。本文叙述了简单易于实现方案。
This article describes a new frequency modulation for digital transmission, called controlled frequency modulation (TFM). The desired constant amplitude envelope signal problem is always associated with the maximum spectrum saving. The issue of spectrum savings is very important, especially in radio channels. The out-of-band radiation of the controlled frequency modulation is lower than other existing fixed envelope modulation techniques and uses synchronous detection with only a 1 dB difference in error characteristics compared to the four-phase modulation. The meaning of TFM refers to the special control of the transmitter oscillator frequency so that the phase of the modulated signal changes to a smoothing function with the relevant characteristic time. This article describes a simple and easy to implement program.