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What is the difference between MSK and GMSK charts?
The MSK constellation has four dots with a phase difference of 90 degrees

The GMSK constellation has two dots next to each dot compared to the MSK constellation which has 12 dots. This is due to the inter-code interference caused by the Gaussian low-pass filter that the signal passes through first

To put it plainly, the GMSK is a way of increasing the inter-code interference in order to improve the transmitter spectrum

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