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.
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. 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.
| Amateur radio digital modes | ||
|---|---|---|
| Frequency-shift keying (FSK) |  | |
| Multiple frequency-shift keying (MFSK) | ||
| Phase-shift keying (PSK) | ||
| COFDM |
| |
| Non-traditional digital modes | ||
References
- 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.
- Steve Ford (2007). ARRL's HF Digital Handbook. American Radio Relay League. pp. 10–. ISBN 978-0-87259-103-5.
- 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.
- "Domino".
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