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随着通信卫星4号通信系统的研制,可用频带的最大运用便成为系统的主要要求;这就需要尽量缩小信道间隔.然而,达将导致主信道由于邻信道接近而受到脉冲干扰。在邻信道干扰及热噪声条件下,普通调频解调器的脉冲噪声是通过引伸赖斯方法来进行分析的。主载波和相邻载波被认为是用频带限制高斯噪声来进行频率调制以模拟频分多路信号。本文根据准稳态假定,对这种频率调制进行了分析。然后将这种分析方法加以引伸,以用于具有频率反锁的调频解调器(FMFB)。用电子计算机得到的数学结果经证实与实验结果非常一致。
With the development of communication satellite No. 4 communication system, the maximum utilization of the available frequency band has become the major requirement of the system; this requires minimizing the channel spacing. However, this will result in the main channel being pulsed with interference due to the proximity of the adjacent channels. In the case of adjacent channel interference and thermal noise, the impulse noise of an ordinary FM demodulator is analyzed by the inductive Rice method. The main and adjacent carriers are considered to be frequency-modulated with band-limited Gaussian noise to simulate a frequency-division multiplexed signal. Based on the quasi-steady-state assumption, this paper analyzes the frequency modulation. This analysis method is then extended for use with a frequency demodulator (FMFB) with frequency lockdown. The mathematical results obtained with a computer have been shown to be in good agreement with the experimental results.