Radwin Ltd. 5XACMOD3C User Manual

FinM Deployment Guide

Release 4.5.10

4‐18

Basic Situation

Configuring the Radio Network

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If your system uses more than 3 frequencies, this method of interference mitigation is

not needed.

4.5.1 Basic Situation

The three frequencies are used on the TBSs in a staggered fashion: TBS1 uses F1, TBS2 uses
F2, TBS3 uses F3. The pattern is then repeated: TBS4 has again F1, TBS5 has F2, TBS6 has F3,
and so on.

We assume that the nominal distance between each TBS is at least 500m (below ground;
above ground this value can be as large as 2000m). See

Figure 4‐10

Figure 4‐10: Co‐Channel Neighbors

At a given moment, a rail car (with TMU1) is synchronized with TBS1, and using frequency F1.
At this same moment, this rail car is about 1500 meters away from TBS4, which is also using

Any signal that TMU1 receives from TBS4 at this point is considered interference. If the signal
from TBS4 is strong enough, the interference can harm the throughput, and needs to be
mitigated.

This situation continues throughout the line ‐ TBS7 can interfere with TBS4/TMU4, and in turn
TBS4 can interfere with TBS7/TMU7. TBS7 can further interfere with TBS10, TBS10 can
interfere with TBS7 and TBS13, and so on down the line.

The two units that can interfere with each other are called “co‐channel neighbors”.

4.5.2 Necessary Pre‐Conditions

If the “Co‐Channel Neighbor Interference Mitigation” option is configured, it will be activated
or de‐activated automatically according to the conditions described below. Note that the
activation conditions and de‐activation conditions are not exactly symmetrical.

1. If fewer than 3 frequencies are used, the values would be 1000m for two and 500m for one frequency.

TBS1

TBS4

TBS7

TBS2

TBS3

TBS5

TBS6

TMU1

TMU4

TMU7

500m

co‐channel neighbors