频谱监测射频接收机频谱纯度的影响因素分析

Analysis of Factors Effecting the Frequency Spectrum Purity of RF Receiver for Frequency Spectrum Monitoring

频谱监测射频接收机的输出频谱质量是频谱监测系统获得辐射源正确的频谱信息和内涵信息的关键。介绍了一种应用于频谱监测的宽带射频接收机架构,分析了影响该架构射频接收机输出频谱纯度的主要因素即相位噪声的影响机理,并给出了改善相位噪声的方法。相位噪声改善前后对解调性能的比对表明,解调误码率降低了一个数量级。

The output spectrum quality of the RF spectnma monitoring receiver is the key to obtain correct spectrum information and relationship information from spectrum monitoring system. A framework of wideband RF receiver used for spectrum monitoring is introduced. The mechanism of the main factor or the phase noise affecting its output spectrum purification is analysed. Furthermore, the method of reducing phase noise is presented. Comparison of demodulation performance before and after reducing phase noise shows that the demodulation BER is decreased by one order of magnitude after reducing phase noise.