The ORFS for 8-pslk issue

[mckinson]

orfs edge

Dear Guys :


These days we find the ORFS due to modulation and switching is very poor for EDGE 8-psk ,but for the GMSK is very good . I have checked all the power supply both for the Tranceiver and PA ,no found something wrong . Could you please give me some suggestion ? Best Regards !

 

[vfone]

EDGE use a different modulator than GMSK. Check to see if this modulator is working properly (IQ offset, IQ imbalance, etc).
I don’t know what type of PA you are using for EDGE, linear or Polar Modulator. Each approach can get different problems, which can make to fail the ORFS.

 

[mckinson]

Hi vfone
Many thanks for your kindly help .
We use the RFMD 3161 ,the polar type .