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首先简要介绍了通信系统中接收机灵敏度和系统电平余量的概念，然后着重分析了在不同的扩频通信系统中这两项指标的估算方法，最后总结了各种系统的特点。
First of all, the concept of receiver sensitivity and system level margin in communication system is briefly introduced. Then the methods of estimating these two indexes in different spread spectrum communication systems are emphatically analyzed. Finally, the characteristics of various systems are summarized.