基于正弦调制信号的矿井下超宽带功率谱密度研究

Ultra-wideband wireless communications technology has a broad prospect applied in the coal mine for its anti-multipath performance, low power consumption, strong force of penetration, low cost and easy to protect and maintain. This paper focused on analyzing power spectral density characteristics of sinusoidal modulation signal based on ultra-wideband in coal mine. We draw an important conclusion: no sinusoidal modulation spacing of rectangular pulse-train rate of the envelope of power spectrum density is the Fourier transform of the rectangular pulse shape, in the case of sinusoidal modulation signal, the signal spectrum shape is changed, the number of P-line should be more than the original, and these new lines are located in frequency , that is the location of the modulation signal frequency , pulse repetition frequency , and frequency of their harmonics, as well as the difference frequency.