User's Manual

- 25 -
User’s manual_v01
2.3 Function features
2.3.1 ICS
In order to ensure that the output power radiated from the service antenna does not flow into the donor antenna,
sufficient isolation between the antennas must be ensured, otherwise the radiated signals feed through to the
donor antenna side and amplified again, resulting in system oscillation and other disturbances.
Figure 2 - 12 Concept of ICS
PSR offers Interference Cancellation System (ICS) function for proper working without system oscillation, even
the place where the isolation between these antennas is insufficient.
It is equipped with an ICA (Interference Cancellation Algorithm) function to obtain isolations between the Donor
and the Service Antenna, remove feedback or interference signals, and ensure the system reliability.
2.3.2 Isolation measurement
Another option against the isolation problem is to make sure isolation value and take advantage of it when it
comes to set up the system gain.
Isolation value can be measured correctly in real-time whether there is an input signal or not.
However, measurable ISO range is limited by the current gain, and measured ISO value is in the range of -20dB<
gain<20dB, and typically has ±3dB tolerance on average.
Donor
ANT
Service
ANT
FPGA
SUM
∑
DIV
÷
TIME
PWR
t1 t2 t3Pin Pout
Window Size
SIGNAL INPUT
SIGNAL OUTPUT
INPUT+FEEDBACK
SIGNAL PROCESSING
TIME
TIME
TIME
phase
Φ
Digital
0
1
Feedback canceled