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Transmitter sided out of band signal reduction method


Kurzfassung

 

  • Technology to mitigate cross-talk in radio transmission applications
  • Developed for CPM (continuous phase modulation)
  • Especially suitable for tactical radio applications


Hintergrund

The optimal utilization of the available frequency bands plays an important role in the transmission of data and messages. In frequency multiplexing, sub-frequency bands are allocated to individual communication channels, which are usually completely independent of each other. In practice, however, there is cross-talk; that is, in a channel, signals from the two adjacent channels are also received. Thus, the received signal is composed of a useful signal and an interference signal.

The aim of the present invention is to compensate for the interfering signal component. This is particularly important when the intensity of adjacent channel signals and thus the interference signal which they contribute are greater than the actual useful signal (“adjacent channel interference problem”).


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Lösung

On the transmitter side, the spectral components which lie outside the dedicated communication channel (interference signal) are separately generated in a parallel signal path and are then subtracted from the transmission signal. The resulting modified signals no longer protrude into the adjacent channels, significantly improving the overall signal quality.


Anwendungsbereiche

 

  • Solution to mitigate cross-talk
  • Developed for CPM (continuous phase modulation)
  • Applicable for all types of CPM-based wireless communications, especially tactical radio applications


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