FHSS IN A WLAN NETWORK

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Hello， 

Frequency-hopping spread spectrum (FHSS) is a method of transmitting radio signals by rapidly changing the carrier frequency among many distinct frequencies occupying a large spectral band. The changes are controlled by a code known to both transmitter and receiver. FHSS is used to avoid interference, to prevent eavesdropping, and to enable code-division multiple access (CDMA) communications. 

The available frequency band is divided into smaller sub-bands. Signals rapidly change ("hop") their carrier frequencies among the center frequencies of these sub-bands in a predetermined order. Interference at a specific frequency will only affect the signal during a short interval.

FHSS offers three main advantages over a fixed-frequency transmission: 

1. FHSS signals are highly resistant to narrowband interference because the signal hops to a different frequency band.

2. Signals are difficult to intercept if the frequency-hopping pattern is not known.
FHSS transmissions can share a frequency band with many types of conventional transmissions with minimal mutual interference.

3. FHSS signals add minimal interference to narrowband communications, and vice versa.

Hope to help you!

Hello @vera1234 ,

Frequency Hopping Spread spectrum is a 802.11 physical layer technology.

Principle:

The spectrum is divided in many rectangles based on frequency and time.

Now based on a pseudorandom sequence known by both the transmitter and receiver the information switches among these different carriers.