摘要
通过对TFM调制技术的研究,修正了其中预调制滤波器冲击响应波形g(t)在时间轴上的位置及其频谱G(w)的表达式。然后将TFM基带信号进行近似,即对TFM的相位路径进行进一步的控制,得到一个改进的TFM调制技术。改进后的TFM调制技术和原TFM调制技术相比,频带压缩能力提高了一倍,误码性能不变,但会出现3dB的寄生调幅,需要提高发射机的发射功率。
In the light of studies on the principles of TFM technology, the author modifies the position of waveform of g（t）, the impulse response of the pre-modulation filter on the time axis and the expression of G（w）, the Fourier spectrum of g（t）. Then the author develops TFM technology by approximating TFM base-band signals Compared with the former TFM technology, the developed TFM technology can narrow the power spectra one time while keeps the same error rate. And however, 3dB amplitude modulation is appeared and needs to raise the power of transmitter.
出处
《通信技术》
2008年第9期34-35,38,共3页
Communications Technology
