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#1
2010-06-09, 10:37 PM
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GMSK vs QPSK
Hi friends,
I am currently working on a thesis and I need some ideas that why we cannot (it is not convenient) use QPSK modulation in GSM (air) communication. Can you please provide some drawbacks??? I have checked the comments in google but I would like to hear the opinions of engineers. thank you for your help. 
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#2
2010-06-10, 12:39 AM
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[QUOTE=Klevo;87782]Hi friends,
I am currently working on a thesis and I need some ideas that why we cannot (it is not convenient) use QPSK modulation in GSM (air) communication. Can you please provide some drawbacks??? I have checked the comments in google but I would like to hear the opinions of engineers. thank you for your help.[/QUOTE It is related to bandwidth efficiency as GMSK has higher efficiency but the draw back is that need high power than QPSK. and GMSK using filter to reduce intersymbol interference. BR RF
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