高效数字调制VMSK的错觉
The vmsk modulation delusion
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摘要: Walker提出了一种高效率的数字调制方案VMSK调制,根据 Walker的分析,它的频带利用率可以达到 30bit/(sHz),而且没有能量损失。该文从工程和信号处理的角度分析了这种调制,得到了一个非常可惜的结果,这种调制并没有所说的性能。Abstract: H. R. Walker presented a high spectral efficiency modulation (VMSK). It can reach 30 bit/(sHz) simply without loss of SNR in his analysis. There are papers introduce this technology in China too. But, through deeply analysis based on the engineering point, a very regrettable conclusion is obtained, i.e, this technology is a beautiful rainbow!
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