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output power in GSM & EDGE (Question)

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mehdi

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Hi everybody
why the output transmission power (from BTS) in EDGE(8PSK modulation) is less than GSM(GMSK modulation)?
Thanks in Advance
 

I think maybe related to the modulation scheme .right ?
 

Yes, becuase of the modulation scheme. EDGE use 8PSK which has a PAR of ~3dB. Given almost the same system, with the PA originally used for GSM, the output power for EDGE has to be ~3dB lower than GSM (Max power ~35dBm, which use GMSK with 0dB PAR)
 

Can you provide me more information?
 

As modulation scheme used in EDGE reduces bit error rate
 

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