Page 5 - Microwave and mmWave Interference Best Practices
P. 5
Frequency Planning Channels may be available on a link-
by-link basis or by a channel block method.
Planning should include a determination of
The goal should always be to the nodes to be connected and the quality
minimize the amount of frequency usage availability respective for each. Following,
that can be accomplished while keeping the the traffic/capacity should be considered
quality as unaffected by interference as before then assigning the duplex half for
possible. the transmitters. Check the azimuths
(directions) and elevation to
determine possible near
Considerations for Frequency Assignment
interference. Understand the
Determining a frequency band that is suitable for the specific link (path antenna radiation patterns,
length, site location, terrain topography, and atmospheric effects) polarization, and front-to-back
Prevention of mutual interference such as interference among radio ratio, to know approximately
frequency channels in the actual path, interference to and from other where the antenna transmits.
radio paths, interference to and from satellite communication systems, Start planning with lower
and so on output power. Finally
understand the network
Correct selection of a frequency band that allows the required configuration/topology specific
transmission capacity while efficiently utilizing the available radio
to the situation.
frequency spectrum
At this point the
Microwave systems engineering
With this in mind, channels will also need to may review. The system engineers will look
be examined. Channels are subdivisions of a into the systems and integration into the
frequency band in which a certain number hardware to re-analyze the possibility of
of carriers may be accommodated. Each
new equipment and check the desired
channel will have a transmit and a receive design and performance expectations.
frequency with duplex spacing to ensure Some difficult areas may require a greater
sufficient space to not cause interference. amount of review due to varying conditions.
Areas with lots of rain, or great variations in
temperature may be of
issue. Anywhere that many
reflections may because
may also take extra
considerations.
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