硬限幅数字接收机中信号的包络恢复与检测

Envelope Recovery and Detection of Signals in Hard-limiting Digital Receiver

传统通信系统接收机中模拟器件的非理想特性对通信系统的性能有很大影响,而硬限幅数字接收机直接对接收信号进行硬限幅采样,不需要匹配滤波、模拟延迟单元,自动增益控制等电路,能有效地减少器件的非线性给性能带来的影响,提高接收机在干扰条件下的接收性能。另外,硬限幅数字接收机体积小,结构简单,为便携式卫星抗干扰通信终端的研制提供了条件。最后,通过对硬限幅数字接收机结构的研究,对接收机的解调检测性能进行仿真分析。

Nonideal characteristics of the analog device in the receiver of traditionary communication system have much effect on communication performance. However, the hard-limiting digital receiver utilizes a hardlimiter to simplify the digital hardware and conducts hardlimiting sampling directly. Therefore, it can compensate for this nonlinear effect caused by analoy devices, and improve the receiving performance under the jamming contion without any matched filter, analog delay element and automatic gain control circuitry. In addition, because the hard-limiting digital receiver has small volume and simple hardware, it can be developed as a concept prototype for the portable satellite antijamming communications terminal. The demodulating and detection performance of the receiver was emulated and analysed by researching the architecture of hard-limiting digital receiver.