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本文试用系统工程原理综合评价有代表性的四种移动无线传输数字语言用的恒定包络调制方法,即小频偏二进制相位连续数字调频(BFM)、修正型双二进制调频(DEFM)、高斯滤波最小移频键控(GMSK)和紧缩频谱调频(TFM)四种方法。从六个目标值,即频带利用率和限带影响、稳态抗噪声、动态抗扰性、对载频与定时偏差的敏感性、实施可行性与经济性进行分析和对比。求出或定出其相对目标值,然后算出综合评价指数,得出在当前条件下采种何种调制,从发展来看采用哪种调制较为合理的结论。
This paper attempts to systematically evaluate the representative four kinds of constant envelope modulation methods used in digital languages for mobile wireless transmission by systematical principles of system engineering, namely, the small frequency deviation binary phase continuous digital frequency modulation (BFM), the modified double binary frequency modulation (DEFM), the Gaussian filter Minimum Shift Keying (GMSK) and Tight Frequency Modulation (TFM) four methods. From the six target values, namely the band utilization and band limiting effects, steady-state noise immunity, dynamic immunity, sensitivity to carrier frequency and timing deviation, feasibility and economy of implementation are analyzed and compared. Find out or set its relative target value, and then calculate the comprehensive evaluation index, draw the current conditions of mining what kind of modulation, from the development point of view to adopt a more reasonable conclusion of the modulation.