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卫星通信通常在频带受限和功率受限的情况下工作,因此,设计一种具有窄频谱和能节约发射功率的信号就成为重要的课题。本文首先对基带信号通过理想低通滤波器所出现的问题进行了简要的讨论,在此基础上提出了采用IJF(intersymbol interference and jitter—free——无码间串扰和抖动)信号的必要性。为了实现这种信号波形,本文报告了自行设计的、具有简单、可靠及价格低廉等特点的非线性滤波器,及将该电路应用于SCPC/DAMA系统科研项目中的情况。
Satellite communications typically operate with limited frequency and limited power, so designing a signal that has a narrow spectrum and saves transmit power becomes an important issue. This paper first briefly discusses the problems that baseband signals pass through ideal low-pass filters, and then proposes the necessity of using intersymbol interference and jitter-free (IJF) signals. In order to realize this kind of signal waveform, this paper reports the self-designed non-linear filter with the characteristics of simplicity, reliability and low cost, as well as the application of the circuit in the SCPC / DAMA system research project.