遥测接收机的一种载波频偏抑制方法

A New Scheme to Suppress Carrier Frequency Deviation for Telemetry Receiver

  • 摘要: 讨论了一种PCM/FM遥测数字接收机的载波频偏抑制方法。理论推导证明,在全数字接收机条件下,载波频偏对于理想FM解调输出信号的影响相当于对其进行了幅度调制。因此基于滑窗最大最小值法对鉴频后的信号进行平均包络检测,再从中减去平均包络部分,从而得到频偏抑制后的信号。给出了设计实例和计算机仿真结果,误码率测试曲线表明该方法不但有效,而且能够适应较大的频偏变化率。

     

    Abstract: A new scheme to suppress carrier frequency deviation for PCM/FM telemetry digital receiver is presented. Theoretical deduction proves that under the condition of all digital receiver, the ideal FM demodulated signal is equivalent to a signal with amplitude modulated by the frequency deviation. From this theoretical result, we propose a new scheme to suppress the carrier frequency deviation. Design examples and computer simulation show the new scheme is effective and applicable for more higher frequency variable rate.

     

/

返回文章
返回