Aerospace and Electronic Systems Magazine May 2018 - 53

Cooklev et al.

Figure 8.

Variations of the received power (no interference).

Figure 9.

Averaged values (with interference).

by rising EME and GBN and that it is necessary to determine
and monitor their levels and spectrum. This justifies the need for
applying specific measurement methods to monitor, analyze, and
predict the rise of EME and GBN. It is also of major importance
that the results of the monitoring be collected in RF and geodatabases in order to have the possibility to be analyzed, with the
results being used as input for the development of methods for
reduction of EME and limiting the rise of the overall GBN floor.
Furthermore, the rapid increase of expanding narrowband to ultra-wideband mobile communications is becoming another major
cause for the rise of EME and GBN levels. Rather than having the
majority of their energy concentrated within an allocated bandMAY - JUNE 2018

width, these devices operate by spreading their signal over much
wider bandwidths, as is the case of the CDMA access. As such,
the energy is distributed across a very wide range of spectrum
and is a potential interference source, causing an overall rise in
GBN floor. Therefore, the entire issue of power control of the
radio transmitters, frequency allocation and spectrum sharing,
coupled with modern advanced digital techniques, such as smart
antenna beam forming, digital coding, and correlation plus digital RF interference reduction, has been totally re-addressed. The
results form RF data analytics would also enable the responsible
authorities to maintain the overall value and utility of the radio
spectrum resource.

IEEE A&E SYSTEMS MAGAZINE

53



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