cdma2000 1x sensitivity question

[bill_test36]

I have a cdma design question in air measurement.
AIR RX sensitivity == -96 dB request need above -104 dB.
I've found some noise frequency in rx band(-70 dBm)
Noise frequency is spread rate 1.228MHz's multiple .
How to reduce this noise power ?
help me !! thanks you help .

 

[bill_test36]

Who can help me ?
I can't reduce noise power level .

 

[vfone]

In a CDMA receiver, there are two Noise sources of interference that are purely white Gaussian noise:
-The receiver's input referred thermal noise power spectral density No.
-The transmitter's thermal noise power spectral density in the receive frequency band.

In your case definitely you have a baseband problem. The spreading signal is coupling somehow direct to the input of the A/D converter. A scope on the DC lines would help to fix this problem.

 

[bill_test36]

Dear guy :
I use cdma chip is Qualcomm MSM6025 .
Do you have any recommend for RX sensitivity problem ?
I can't reduce 1.228MHz multiple power level.

Thanks your help !!