Frequency Hopping Spread Spectrum

What Does Frequency Hopping Spread Spectrum Mean?

Frequency hopping spread spectrum (FHSS) is a method of transmitting radio signals by shifting carriers across numerous channels with pseudorandom sequence which is already known to the sender and receiver.


Frequency hopping spread spectrum is defined in the 2.4 GHz band and operates in around 79 frequencies ranging from 2.402 GHz to 2.480 GHz. Every frequency is GFSK modulated with channel width of 1MHz and rates defined as 1 Mbps and 2 Mbps respectively.

Techopedia Explains Frequency Hopping Spread Spectrum

Frequency hopping spread spectrum is a robust technology with only very little influence from reflections, noise and other environmental factors. The active system numbers in same geographical areas is higher than an equivalent number for direct sequence spread spectrum systems. Thus it is suited well for installations designed to cover large areas where numerous co-located systems are needed. They are also used in cellular deployments for fixed broadband wireless access where direct sequence spread spectrum cannot be used. A variation of frequency hopping spread spectrum is adaptive frequency hopping spread spectrum that improves resistance to radio frequency interference by avoiding crowded frequency in hopping sequence.


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Margaret Rouse

Margaret Rouse 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 explanations have appeared on TechTarget websites and she's been cited as an authority in articles by the New York Times, Time Magazine, USA Today, ZDNet, PC Magazine and Discovery Magazine.Margaret's idea of a fun day is helping IT and business professionals learn to speak each other’s highly specialized languages. If you have a suggestion for a new definition or how to improve a technical explanation, please email Margaret or contact her…