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1 引言调相方式中,四相调制代表了功率和带宽的最佳折衷,对于在高频段进行中容量传输其带宽已经足够。对于载波频率与数据率不为整数倍情况,一般选用插入法即可完成调相。然而,实验中发现,这种关系下,插入法在连续要求调相(3π)/2时,实际无法准确调相。本文就这一问题进行了讨论,并通过实验提出扣除法实现准确调相。 2 实验分析 2.1、实验结果:插入法原理有关资料均有详细介绍,实验以此为基础设计电路,
1 Introduction Phase modulation mode, the four-phase modulation represents the best compromise between power and bandwidth, bandwidth for high-capacity transmission in the band has been enough. For the carrier frequency and data rate is not integer times the situation, the general use of interpolation method to complete phase modulation. However, it has been found experimentally that in this relationship, the interpolation method can not accurately phase-correct when the phase modulation (3π) / 2 is continuously required. This article discussed this issue, and deduced through experiments to achieve accurate phase modulation. 2 Experimental Analysis 2.1, the experimental results: The principle of insertion method are described in detail, the experiment based on this circuit design,