<Ul> <Li> </Li> <Li> </Li> <Li> </Li> </Ul> <P> Frequency - hopping spread spectrum (FHSS) 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 code division multiple access (CDMA) scheme frequency - hopping code division multiple access (FH - CDMA). </P> <P> Each available frequency band is divided into sub-frequencies . Signals rapidly change ("hop") among these in a predetermined order . Interference at a specific frequency will only affect the signal during that short interval . FHSS can, however, cause interference with adjacent direct - sequence spread spectrum (DSSS) systems . </P> <P> A sub-type of FHSS used in Bluetooth wireless data transfer is adaptive frequency - hopping spread spectrum (AFH). </P>

In fhss the sequence of changing frequencies is called the