1.1 Background to spectrum engineering
The radio spectrum is a limited resource and can only be used optimally if compatibility is assured between radiocommunications systems located in the same or adjacent frequency bands. For example, an important criterion for radio compatibility is the difference between the wanted and unwanted signal levels in the victim link receiver input. This parameter is used to derive a separation between the victim and interfering systems or services in geographical space or frequency domain. Considering only the adjacent bands, the most significant interference mechanisms are unwanted emissions from interfering transmitters as well as blocking and intermodulation in the victim link receiver.
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