The frequency hopping spread spectrum (FHSS) technique uses M different
carrier frequencies that are modulated by the source signal.
At one moment, the signal modulates one carrier frequency; at the next
moment, the signal modulates another carrier frequency.
Although the modulation is done using one carrier frequency at a time, M
frequencies are used in the long run.
The bandwidth occupied by a source after spreading is BFHSS » B.
Figure 28 shows the general layout for FHSS.
A pseudorandom code generator, called pseudorandom noise (PN), creates
a k-bit pattern for every hopping period Th.
The frequency table uses the pattern to find the frequency to be used for
this hopping period and passes it to the frequency synthesizer.
The frequency synthesizer creates a carrier signal of that frequency, and the
source signal modulates the carrier signa