frequency hopping (FH)

Frequency hopping(FH) is a radio transmission method that works with periodic frequencychanges, in which the modulated carrier frequency changes abruptly, hence the term frequency hopping technology.

In frequency hopping, the number of frequency changes depends on the application and the frequency hopping variant. The frequency hopping technique( FHSS) used in WLANs and mobile networks operates with approximately 20 frequency hops per second. There are also two other variants, slow frequency hopping (SFH) and fast frequency hopping (FFH).

In slow frequency hopping, several bits are transmitted per carrier frequency, while in fast frequency hopping the frequency changes occur during one bit duration. This means that a single bit is sent on one or more carrier frequencies.