Engineering:Incremental frequency keying

From HandWiki

Incremental frequency keying, also known as IFK or IFK+, is a modified type of MFSK modulation where the data to be transmitted is represented by the difference in frequency between the previously received tone and the currently received tone.[1][2] This modulation produces a signal which is much more tolerant of receiver mis-tunings and frequency drift than MFSK modulation. Additionally, IFK modulation is more resistant to multipath interference and intersymbol interference caused by multipath propagation than traditional MFSK.[3][4] This combination of features makes IFK modulation well suited for high frequency communications.

This modulation is used in the amateur radio data-modes DominioEX and THOR.


References

  1. ↑ Roland Proesch; Aikaterini Daskalaki-Proesch (26 May 2015). Technical Handbook for Radio Monitoring VHF/UHF: Edition 2013. BoD – Books on Demand. pp. 56–. ISBN 978-3-7322-4147-7. https://books.google.com/books?id=B7iuCQAAQBAJ&pg=PA56. 
  2. ↑ Steve Ford (2007). ARRL's HF Digital Handbook. American Radio Relay League. pp. 10–. ISBN 978-0-87259-103-5. https://books.google.com/books?id=STpiwLFYSHoC&pg=SA10-PA11. 
  3. ↑ Roland Proesch (26 May 2015). Technical Handbook for Radio Monitoring HF: Edition 2015. BoD – Books on Demand. pp. 71–. ISBN 978-3-7322-4142-2. https://books.google.com/books?id=4reuCQAAQBAJ&pg=PA71. 
  4. ↑ "Domino". http://www.arrl.org/domino. 




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