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本文提出利用扩展频谱信号的特点,扩频信号与其它企务信号占用相同频带同时工作是可能的,可实现的。在相互兼容时,扩频信号将以噪声功率谱密度为P_(ss)/B_(ss)来干扰其它业务信号。(P_(ss)为扩频信号功率,B_(ss)为扩频带宽)其它业务信号将以噪声功率谱密度P_s/B_(ss),来干扰扩频系统。文中对窄宽话音调幅和调频同扩频系统的兼容进行了理论分析和计算,得出在系统输入和输出信噪比上相互影响的计算公式。最后给出相互兼容时的上下限电平值。并给出部分实验结果,分析与实验基本符合。
This paper proposes the use of the characteristics of the spread spectrum signal, spread spectrum signal and other corporate signals occupy the same frequency band while working is possible and achievable. When compatible with each other, the spread spectrum signal will interfere with other service signals with a noise power spectral density of P ss (ss) / B ss (ss). (P_ (ss) is the spreading signal power and B_ (ss) is the spreading bandwidth) Other service signals interfere with the spread spectrum system with the noise power spectral density P_s / B_ (ss). In this paper, the theoretical analysis and calculation of narrowband wideband voice modulation and FM compatible with spread spectrum system are carried out, and the formulas that affect the signal to noise ratio of system input and output are obtained. Finally, give the upper and lower limits when compatible with each other. And some experimental results are given, which are in good agreement with the experiment.