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.

EGPRS Test Meeting theChallenge of 8PSK Modulation.pdf

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