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Description: GMSK是高斯滤波的最小频移键控的简称，基本的工作原理是将基带信号先经过高斯滤波器成形，再进行最小频移键控(MSK)调制。由于成形后的高斯脉冲包络无陡峭边沿，亦无拐点，因此频谱特性优于MSK信号的频谱特性。-GMSK Gaussian filter is the smallest FSK abbreviation, the basic working principle is to base-band signal to pass Gaussian filter shape, and then a minimum frequency shift keying (MSK) modulation. After forming as a result of the Gaussian pulse envelope without the steep edge, there is no inflection point, so the spectrum characteristics of the spectrum than MSK signal characteristics.
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Size: 1731584 |
Author: 朱书洪 |
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Description: This application note starts with a review of the 8PSK modulation format.
The reasons for adopting 8PSK with 3π/8 rotation in the EDGE system
are presented. The relationship between GMSK and 8PSK is reviewed.
The challenges of 8PSK power measurements are then considered. The
dependence of burst power on modulating data is discussed and quantified.
In this context, the trade-off between burst power measurement accuracy
and speed is studied. The estimated carrier power concept is introduced
as a technique for achieving the required measurement accuracy without
having to compromise measurement speed.
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Size: 526336 |
Author: ali |
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