Radwin Ltd. 5XACMD3CN 用户手册
FinM Deployment Guide
Release 4.2.46
3‐18
Interference Mitigation for Co‐channel Neighbors
Configuring the Radio Network
3.5 Interference Mitigation for Co‐channel
Neighbors
Neighbors
If your system uses 3 or fewer frequencies, we recommend that you use the Co‐Channel
Neighbor Interference Mitigation method described here to reduce interference between
TBSs.
Neighbor Interference Mitigation method described here to reduce interference between
TBSs.
•
This method is used in addition to the Hub Site Synchronization method.
•
If your system uses more than 3 frequencies, this method of interference mitigation is
not needed.
3.5.1 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.
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
above ground this value can be as large as 2000m). See
Figure 3‐10: 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
At this same moment, this rail car is about 1500 meters away from TBS4, which is also using
F1
1
.
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.
from TBS4 is strong enough, the interference can harm the throughput, and needs to be
mitigated.
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
500m
500m
500m
500m
500m
co‐channel neighbors
co‐channel neighbors
For Regualtor Approval Only