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Slow Frequency Hopped Multiple Access (SFHMA) refers to a spread-spectrum system in which the hop or dwell time is much higher than the information symbol period.
The network’s multiple access interference is cut down significantly when the hopping is synchronized with other elements present in the wireless network.
Techopedia Explains Slow Frequency Hopped Multiple Access
SFHMA has the ability to provide inherent frequency diversity and to beneficially randomize the impact of co-channel interference. It can also be usefully combined with the innovative Space-Time-Shift Keying (STFSK) scheme.
SFHMA can avoid the prolonged fade issues that are often experienced by slow-moving or stationary mobile stations (MSs). This is due to the fact that hopping to another independently- faded frequency may reduce fading. The classic SFH900 mobile system showcased the advantages of SFHMA. SFH900 mobile system was centered on "mixed" slow frequency hopping (SFH) blended with time division.
