ATDI announces new GSM-R Intermodulation features
The unwanted intermodulation phenomenon comes from the non-linearity of the amplifier in the receiving chain and is generated when two (or more) signals are present in a non-linear circuit.
For example, two signals of frequencies 2f1 – f2 and 2f2 – f1 may appear in the receiver: these are intermodulation products.
The receiver, listening to a channel whose frequency is f0, is interfered by intermodulation products when the following conditions are met:
. f0 = 2f1 – f2 or f0 = 2f2 – f1
. the strength of the signals f1 and f2 is above a given threshold
For wideband (UMTS, LTE) signals, it has been shown that a receiver generates IM products by mixing different spectral components corresponding to multiple GSM channels
of 200 kHz bandwidth that just one UMTS or LTE signal occupies (intra-signal intermodulation).
. Multi-technologies (GSM/UMTS/LTE)
. Adaptive thresholds
. User defined thresholds
. Intermodulation at 2 and 3 frequencies
. User defined triggers
. User defined interference distance
. Test point distribution (user defined sampling)
. Vector / Raster matching
. Excel report
. On map interference display
. Test point filter
. High resolution maps
. Dataset: DTM+Clutter+Buildings (more information)