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本文分析了在光纤上进行电视信号模拟传输所采用的一些主要脉冲模拟技术,即PPM(脉位调制)、PWM(脉冲宽度调制)和PFM(脉冲频率调制)。特别提出了一种通用方法来计算解调器输出端的噪声谱密度,然后计算信噪比。所得的公式涉及到光纤的电视信号模拟传输系统的一些主要参数,并可将这些公式用来设计传输系统和计算其性能。
This paper analyzes some of the major pulse simulation techniques used to simulate the transmission of television signals over fiber, namely PPM, PWM and PFM. In particular, a general approach is proposed to calculate the noise spectral density at the output of the demodulator and then to calculate the signal-to-noise ratio. The resulting formula relates to some of the main parameters of an analog transmission system for television signals over fiber and can be used to design the transmission system and calculate its performance.