could anyone give me any idea about intermodulation measurements? i need it for indoor umts measurements, where intermodulation is high. I´ve heard about a swiss company that provides these kind of solutions, but i don´t have any idea.
could anyone give me any idea about intermodulation measurements? i need it for indoor umts measurements, where intermodulation is high. I´ve heard about a swiss company that provides these kind of solutions, but i don´t have any idea.
thanks a lot
Hi,
Sorry for question, but how to you find intermodulation, and that kind of solution you aspect, guide or methods etc...
Hi,
Intermodulation in the WCDMA is characterized by ACLR parameter(Adjacent Chann. Leakage Power Ratio).
Tries to ask Uncle Google about ACLR measurement,is very much literature about this. As an example of the method is attached, choose your combination of technology and what kind of DAS use: optical, feeder etc.
WHat kind of interference? for adjacent ch. just camp there and compare
signal strength....
PN scanner can give you idea what is on the air.
But, if numbers do not match (EcNo is worse as expected), hunt for
other interference.
It might be some crossmodulation (other TXes), PC with 2.1 GHz clock,
oscilating TV preamplifier etc...
Spectrum analyzer is a must.
Monitor uplink signal strength: it can point to some interference.
The other day we found hanged HSPA terminal, transmitting full power.
Took some time to find owner and **kindly** ask for reset.
(FIrst we analyzed uplink interference in different cells to get approximate
location, then plain old goniometry on the field.)
Originally Posted by nofelet
Hi,
Intermodulation in the WCDMA is characterized by ACLR parameter(Adjacent Chann. Leakage Power Ratio).
Tries to ask Uncle Google about ACLR measurement,is very much literature about this. .
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