Frequency-hopping spread spectrum

The foundation for modern spread-spectrum communication technology

Announcement / Release
June 10, 1941
Birth Place
Boston, Massachusetts, United States of America


Frequency Hopping Spread Spectrum is a method of transmitting radio signals by rapidly switching a carrier among many frequency channels, using a pseudorandom sequence known to both transmitter and receiver. It is used as a multiple access method in the frequency-hopping code division multiple access (FH-CDMA) scheme. FHSS is a wireless technology that spreads its signal over rapidly changing frequencies. Each available frequency band is subdivided into sub-frequencies. Signals rapidly change ('hop') among these in a pre-determined order. Interference at a specific frequency will only affect the signal during that short interval. FHSS can, however, cause interference with adjacent DSSS systems. A sub-type of FHSS used in Bluetooth is adaptive frequency hopping spread spectrum (AFH). The idea was co-created by Hedy Lamarr, who is often better known as an actress, and George Antheil, an avant garde composer.

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