Slow Frequency Hopped Multiple Access

What Does Slow Frequency Hopped Multiple Access Mean?

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.


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Margaret Rouse
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Margaret is an award-winning technical writer and teacher known for her ability to explain complex technical subjects to a non-technical business audience. Over the past twenty years, her IT definitions have been published by Que in an encyclopedia of technology terms and cited in articles by the New York Times, Time Magazine, USA Today, ZDNet, PC Magazine, and Discovery Magazine. She joined Techopedia in 2011. Margaret's idea of a fun day is helping IT and business professionals learn to speak each other’s highly specialized languages.