抑制脉冲载波 提高PAM解调质量

Restrain Pulse Modulated Carrier and Improve PAM Mediate Quality

脉冲幅度调制波(PAM)是脉冲调制的一种形式,在通信和控制系统中得到广泛应用。对于 PAM的解调质量问题,大多集中于滤波器性能的研究,忽视了PAM所含脉冲载波成份的影响。本义通过对PAM的频谱及其解调后主要输出成份的分析,指出脉冲载波成份是影响PAM解调质量的重要因素。从而提出了抑制脉冲载波的解调方法,并给出实现这一方法的电路框图。该方法简单可靠,电路成本下降。这对提高PAM 解调质量、降低对滤波器的要求,具有一定的实用价值。

Pulse amplitude modulation (PAM) is one form of the ways, in which it is widely used in the system of communication and control. The mediate quality of PAM is much commonly concentrated on the research of the character of wave filter and ignores the influence on pulse load-wave contained in PAM.In this article , it points out that the element of pulse modulated carrier is the main factor on the effect of the mediate quality of PAM by the analysis of the frequencyspectrum of PAM and main export element after mediate quality. Therefore, it introduces the method of pulse modulated carrier as well as the realizing the circuit diagram. This method is very simple, depensible, less cost, and also has a certain value to improving the mediate quality PAM and cutting cost of wave filter.