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一、前言除直接系列扩频技术外的,跳频扩频技术也被广泛地用于扩频通讯系统。图1是这种系统的原理图。在发射设备中,跳频码发生器控制频率合成器,随机地选择调制信号的载频,使发射信号频率在规定的频带内随
I. Introduction In addition to the direct series of spread spectrum technology, frequency hopping spread spectrum technology is also widely used in spread spectrum communication systems. Figure 1 is a schematic of such a system. In the transmitting equipment, the frequency hopping generator controls the frequency synthesizer to randomly select the carrier frequency of the modulated signal so that the frequency of the transmitted signal will be within a specified frequency band