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。
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.
出处
《电子科技大学学报》
EI
CAS
CSCD
北大核心
2008年第5期720-723,781,共5页
Journal of University of Electronic Science and Technology of China
基金
部级预研基金(4210109-4)
关键词
载波频偏
数字接收机
PCM/FM
滑窗
carrier frequency deviation
digital receiver
PCM/FM
slip window
